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学者姓名：闫鹏飞
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摘要 ：
Building phase interface with enough solid-phase contact is of great importance for improving chemical reaction kinetics and depth. High dispersion of electrode materials, especially at the atomic-level, are known for high interface contact, yet their potential application in batteries is restricted due to low loading. Herein, the atomically dispersed metal Ni (Ni in Ni-N-C is 54.9 wt %) with high loading was achieved by ultrahigh N-doping carbon (N/N-C:29.5 wt %) during the discharging process of nickel sulfide, leading to good reversibility and high-capacity maintenance owing to ultrahigh phase contact during long cycling for sodium-ion batteries. It delivers a stable cycling life (0.061% capacity decay per cycle) compared with the poor cyclability (0.418%) for the Ni agglomeration electrode with lower N-doping. The assembled pouch cells achieve robust stability (92.1% after 50 cycles). DFT calculations reveal that ultrahigh N-doping and electrochemically formed Na2S can provide thermally stable Na2S/Ni/NC structures, inhibiting Ni agglomeration during cycling.
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| GB/T 7714 | Song, Keming , Liu, Jiefei , Dai, Hongliu et al. Atomically dispersed Ni induced by ultrahigh N-doped carbon enables stable sodium storage [J]. | CHEM , 2021 , 7 (10) : 2684-2694 . |
| MLA | Song, Keming et al. "Atomically dispersed Ni induced by ultrahigh N-doped carbon enables stable sodium storage" . | CHEM 7 . 10 (2021) : 2684-2694 . |
| APA | Song, Keming , Liu, Jiefei , Dai, Hongliu , Zhao, Yong , Sun, Shuhui , Zhang, Jiyu et al. Atomically dispersed Ni induced by ultrahigh N-doped carbon enables stable sodium storage . | CHEM , 2021 , 7 (10) , 2684-2694 . |
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摘要 ：
Interfacial structure evolution and degradation are critical to the electrochemical performance of LiCoO2 (LCO), the most widely studied and used cathode material in lithium ion batteries. To understand such processes requires precise and quantitative measurements. Herein, we use well-defined epitaxial LCO thin films to reveal the interfacial degradation mechanisms. Through our systematical investigations, we find that surface corrosion is significant after forming the surface phase transition layer, and the cathode electrolyte interphase (CEI) has a double layer structure, an inorganic inner layer containing CoO, LiF, LiOH/Li2O and Li x PF y O z , and an outmost layer containing Li2CO3 and organic carbonaceous components. Furthermore, surface cracks are found to be pronounced due to mechanical failures and chemical etching. This work demonstrates a model material to realize the precise measurements of LCO interfacial degradations, which deepens our understanding on the interfacial degradation mechanisms.
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| GB/T 7714 | Qin, Changdong , Wang, Le , Yan, Pengfei et al. LiCoO2 Epitaxial Film Enabling Precise Analysis of Interfacial Degradations [J]. | CHINESE PHYSICS LETTERS , 2021 , 38 (6) . |
| MLA | Qin, Changdong et al. "LiCoO2 Epitaxial Film Enabling Precise Analysis of Interfacial Degradations" . | CHINESE PHYSICS LETTERS 38 . 6 (2021) . |
| APA | Qin, Changdong , Wang, Le , Yan, Pengfei , Du, Yingge , Sui, Manling . LiCoO2 Epitaxial Film Enabling Precise Analysis of Interfacial Degradations . | CHINESE PHYSICS LETTERS , 2021 , 38 (6) . |
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摘要 ：
Electrochemical cycling induces transition-metal (TM) ion migration and oxygen vacancy formation in layered transition-metal oxides, thus causing performance decay. Here, a combination of ab initio calculations and atomic level imaging is used to explore the TM migration mechanisms in LiNi1/3Mn1/3Co1/3O2 (NMC333). For the bulk model, TM/Li exchange is an favorable energy pathway for TM migration. For the surface region with the presence of oxygen vacancies, TM condensation via substitution of Li vacancies (TMsub) deciphers the frequently observed TM segregation phenomena in the surface region. Ni migrates much more easily in both the bulk and surface regions, highlighting the critical role of Ni in stabilizing layered cathodes. Moreover, once TM ions migrate to the Li layer, it is easier for TM ions to diffuse and form a TM-enriched surface layer. The present study provides vital insights into the potential paths to tailor layered cathodes with a high structural stability and superior performance.
关键词 ：
Ab initio calculation Ab initio calculation Ion migration Ion migration Layered cathode material Layered cathode material Lithium-ion battery Lithium-ion battery TEM TEM
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| GB/T 7714 | Wan, Hui , Liu, Zhixiao , Liu, Guangdong et al. Unraveling TM Migration Mechanisms in LiNi1/3Mn1/3Co1/3O2 by Modeling and Experimental Studies [J]. | NANO LETTERS , 2021 , 21 (16) : 6875-6881 . |
| MLA | Wan, Hui et al. "Unraveling TM Migration Mechanisms in LiNi1/3Mn1/3Co1/3O2 by Modeling and Experimental Studies" . | NANO LETTERS 21 . 16 (2021) : 6875-6881 . |
| APA | Wan, Hui , Liu, Zhixiao , Liu, Guangdong , Yi, Shuaiyu , Yan, Pengfei , Deng, Huiqiu et al. Unraveling TM Migration Mechanisms in LiNi1/3Mn1/3Co1/3O2 by Modeling and Experimental Studies . | NANO LETTERS , 2021 , 21 (16) , 6875-6881 . |
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摘要 ：
Ameliorating the absorption capability and thickness of microwave-absorbing materials is still a formidable challenge. Herein, novel nanoporous Co particles are synthesized successfully via the thermal decomposition of Co-based zeolitic imidazolate framework (ZIF-67) and subsequent hydrogen reduction process at relatively low temperatures. Through controlling passivation process, the nanoporous Co/CoO particles are generated as a result of the surface oxidation of Co particles. The crystalline size of Co/CoO particles ranges from 15.1 to 27.7 nm. The Co/CoO sample reduced at 200 degrees C exhibits the highest microwave absorption intensity with a minimum reflection loss (RL) value of-87.2 dB at a matching thickness of merely 1.0 mm, whose effective absorption bandwidth (EAB) for RL <-10 dB is 6.2 GHz. The absorption bandwidth of Co/CoO increases with the increasing reduction temperature, but the matching thickness gets larger. Co/CoO reduced at 300 degrees C possesses extremely broad EAB of 8.2 GHz at a thickness of 1.5 mm. Notably, such superior microwave absorbing properties are attributed to the facts that nanoporous structure can adjust the effective permittivity of the material, and CoO improves the impedance match by promoting dipolar polarization and interfacial polarization processes. The nanoporous Co/CoO particles with strong absorption ability and ultrathin thickness demonstrate a potential application in the electromagnetic wave absorbing field.
关键词 ：
CoO particles CoO particles Low temperature reduction Low temperature reduction Microwave absorption properties Microwave absorption properties Nanoporous Co Nanoporous Co Ultrathin absorber Ultrathin absorber
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| GB/T 7714 | Wu, Qian , Wang, Baolei , Fu, Yonggang et al. MOF-derived Co/CoO particles prepared by low temperature reduction for microwave absorption [J]. | CHEMICAL ENGINEERING JOURNAL , 2021 , 410 . |
| MLA | Wu, Qian et al. "MOF-derived Co/CoO particles prepared by low temperature reduction for microwave absorption" . | CHEMICAL ENGINEERING JOURNAL 410 (2021) . |
| APA | Wu, Qian , Wang, Baolei , Fu, Yonggang , Zhang, Zhengfeng , Yan, Pengfei , Liu, Tong . MOF-derived Co/CoO particles prepared by low temperature reduction for microwave absorption . | CHEMICAL ENGINEERING JOURNAL , 2021 , 410 . |
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摘要 ：
The elemental diversity is crucial to screen out ternary MAX phases with outstanding properties via tuning of bonding types and strength between constitutive atoms. As a matter of fact, the interactions between M and A atoms largely determine the physical and chemical properties of MAX phases. Herein, Se element was experimentally realized to occupy the A site of a MAX phase, Zr2SeC, becoming a new member within this nano-laminated ternary carbide family. Comprehensive characterizations including Rietveld refinement of X-ray Diffraction and atom-resolved transmission electron microscopy techniques were employed to validate this novel MAX phase. The distinct thermal conduction behaviors emerged are attributed to the characteristic interactions between Zr and Se atoms.
关键词 ：
Electrical property Electrical property MAX phase MAX phase Thermal property Thermal property Zr2SeC Zr2SeC
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| GB/T 7714 | Chen, Ke , Bai, Xiaojing , Mu, Xulin et al. MAX phase Zr2SeC and its thermal conduction behavior [J]. | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2021 , 41 (8) : 4447-4451 . |
| MLA | Chen, Ke et al. "MAX phase Zr2SeC and its thermal conduction behavior" . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 41 . 8 (2021) : 4447-4451 . |
| APA | Chen, Ke , Bai, Xiaojing , Mu, Xulin , Yan, Pengfei , Qiu, Nianxiang , Li, Youbing et al. MAX phase Zr2SeC and its thermal conduction behavior . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2021 , 41 (8) , 4447-4451 . |
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摘要 ：
High initial coulombic efficiency is highly desired because it implies effective interface construction and few electrolyte consumption, indicating enhanced batteries' life and power output. In this work, a high-capacity sodium storage material with FeS2 nanoclusters (≈1-2 nm) embedded in N, S-doped carbon matrix (FeS2 /N,S-C) was synthesized, the surface of which displays defects-repaired characteristic and detectable dot-matrix distributed Fe-N-C/Fe-S-C bonds. After the initial discharging process, the uniform ultra-thin NaF-rich (≈6.0 nm) solid electrolyte interphase was obtained, thereby achieving verifiable ultra-high initial coulombic efficiency (≈92 %). The defects-repaired surface provides perfect platform, and the catalysis of dot-matrix distributed Fe-N-C/Fe-S-C bonds to the rapid decomposing of NaSO3 CF3 and diethylene glycol dimethyl ether successfully accelerate the building of two-dimensional ultra-thin solid electrolyte interphase. DFT calculations further confirmed the catalysis mechanism. As a result, the constructed FeS2 /N,S-C provides high reversible capacity (749.6 mAh g-1 at 0.1 A g-1 ) and outstanding cycle stability (92.7 %, 10 000 cycles, 10.0 A g-1 ). Especially, at -15 °C, it also obtains a reversible capacity of 211.7 mAh g-1 at 10.0 A g-1 . Assembled pouch-type cell performs potential application. The insight in this work provides a bright way to interface design for performance improvement in batteries.
关键词 ：
defect repair defect repair initial coulombic efficiency initial coulombic efficiency interface catalysis interface catalysis sodium-ion batteries sodium-ion batteries solid electrolyte interphase solid electrolyte interphase
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| GB/T 7714 | Wan Yanhua , Song Keming , Chen Weihua et al. Ultra-High Initial Coulombic Efficiency Induced by Interface Engineering Enables Rapid, Stable Sodium Storage. [J]. | Angewandte Chemie , 2021 , 60 (20) : 11481-11486 . |
| MLA | Wan Yanhua et al. "Ultra-High Initial Coulombic Efficiency Induced by Interface Engineering Enables Rapid, Stable Sodium Storage." . | Angewandte Chemie 60 . 20 (2021) : 11481-11486 . |
| APA | Wan Yanhua , Song Keming , Chen Weihua , Qin Changdong , Zhang Xixue , Zhang Jiyu et al. Ultra-High Initial Coulombic Efficiency Induced by Interface Engineering Enables Rapid, Stable Sodium Storage. . | Angewandte Chemie , 2021 , 60 (20) , 11481-11486 . |
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摘要 ：
Sulfide-based all-solid-state lithium-ion batteries (ASSLIBs) are promising candidates in the next generation of energy storage technology; the voltage mismatch and the resulting side reactions at the interface between the cathode and the solid electrolyte, however, dramatically deteriorate their cycling performance. Herein, for the first time, we report that the chemical interaction between LiCoO2 (LCO) and TiO2 can be regulated by two additives, carbon and Li, which in situ form a continuous ultrathin pure-phase Li(LCTO) layer with a stable 3D network of spinel structures, relatively low electronic conductivity (2.5 x 10 S cm) and high lithium diffusion coefficient (D = 8.22 x 10) on the surface of LCO. When assembled in ASSLIBs, such an LCTO layer functions as an interlayer between the LCO and the Li solid electrolyte (LGPS). As a consequence, the original interface LCO/LGPS is substituted by two new interfaces LCO/LCTO and LCTO/LGPS. DFT calculations indicate that, compared with the LCO/LGPS, the new interfaces are not only thermodynamically and electrochemically more compatible, but also have higher interfacial affinity. Therefore, the relevant ASSLIB exhibits evidently reduced interfacial impedance, and it also displays a high initial capacity of 140 mA h g and a reversible discharge specific capacity of 116 mA h g after 200 cycles at room temperature (0.1C). In comparison, the ASSLIB assembled without the LCTO interlayer delivers an initial capacity of 98 mA h g and only retains 22.4% capacity after 100 cycles (0.1C). Even at a high cutoff voltage (4.5 V vs. Li/Li), the ASSLIB with the LCTO interlayer could also exhibit a high initial capacity of 180 mA h g and a remarkable retention of 132 mA h g after 100 cycles.
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| GB/T 7714 | Wang, Chuan-Wei , Ren, Fu-Cheng , Zhou, Yao et al. Engineering the interface between LiCoO2 and Li10GeP2S12 solid electrolytes with an ultrathin Li2CoTi3O8 interlayer to boost the performance of all-solid-state batteries [J]. | ENERGY & ENVIRONMENTAL SCIENCE , 2021 , 14 (1) : 437-450 . |
| MLA | Wang, Chuan-Wei et al. "Engineering the interface between LiCoO2 and Li10GeP2S12 solid electrolytes with an ultrathin Li2CoTi3O8 interlayer to boost the performance of all-solid-state batteries" . | ENERGY & ENVIRONMENTAL SCIENCE 14 . 1 (2021) : 437-450 . |
| APA | Wang, Chuan-Wei , Ren, Fu-Cheng , Zhou, Yao , Yan, Peng-Fei , Zhou, Xiao-Dong , Zhang, Shao-Jian et al. Engineering the interface between LiCoO2 and Li10GeP2S12 solid electrolytes with an ultrathin Li2CoTi3O8 interlayer to boost the performance of all-solid-state batteries . | ENERGY & ENVIRONMENTAL SCIENCE , 2021 , 14 (1) , 437-450 . |
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摘要 ：
Lithium-excess cation-disordered rock-salt oxides (DRXs) are investigated intensively as cathode materials for future lithium-ion batteries combining cationic and anionic redox reactions. However, the lattice oxygen redox can cause severe oxygen release resulting in rapid capacity fading. Here, we investigate a series of xLi(2)TiO(3)-(1 - x)LiMnO2 (0 <= x <= 1) materials and find that only Li1.2Mn0.4Ti0.4O2 (x = 0.4) and Li1.1Mn0.7Ti0.2O2 (x = 0.2) can form phase-pure DRXs, which both deliver high capacity (250 mAh g(-1)). The newly discovered Li1.1Mn0.7Ti0.2O2 DRX exhibits remarkably high capacity retention of 84.4% after 20 cycles compared to only 60.8% for Li1.2Mn0.4Ti0.4O2. Our result indicates that the irreversible oxygen loss is reduced by raising the Mn content. Theoretical calculations further reveal that increasing the redox-active Mn content from Li1.2Mn0.4Ti0.4O2 to Li1.1Mn0.7Ti0.2O2 causes the orbitals near the Fermi level to change from O(2)p non-bonding (Li-O-Li unhybridized orbitals) to (Mn-O)* antibonding bands, exhibiting a high O-O aggregation barrier, preventing O-2 release and resulting in sustained capacity retention. Hence, these new findings demonstrate that regulating oxygen redox by tailoring the redox-active transition metal content is an effective strategy to enhance the cycling stability of DRXs.
关键词 ：
Cation-disordered rock-salt oxides Cation-disordered rock-salt oxides Cycling stability Cycling stability Electronic structure Electronic structure Redox-active transition metal Redox-active transition metal Redox mechanism Redox mechanism
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| GB/T 7714 | Zhou, Ke , Li, Yining , Zheng, Shiyao et al. Tailoring the redox-active transition metal content to enhance cycling stability in cation-disordered rock-salt oxides [J]. | ENERGY STORAGE MATERIALS , 2021 , 43 : 275-283 . |
| MLA | Zhou, Ke et al. "Tailoring the redox-active transition metal content to enhance cycling stability in cation-disordered rock-salt oxides" . | ENERGY STORAGE MATERIALS 43 (2021) : 275-283 . |
| APA | Zhou, Ke , Li, Yining , Zheng, Shiyao , Zhang, Maojie , Zhang, Chunyang , Battaglia, Corsin et al. Tailoring the redox-active transition metal content to enhance cycling stability in cation-disordered rock-salt oxides . | ENERGY STORAGE MATERIALS , 2021 , 43 , 275-283 . |
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摘要 ：
In this paper, with the temperature-dependent contact coupling stiffness and friction coefficient, a modified closed-loop coupling disc braking model was established. Considering the effective temperature range during the actual braking process, the proposed modified coupling model could predict the high-frequency braking noise tendency with satisfied accuracy. Regarding above, the finite element models of main braking parts were firstly established, all the parts were integrated and connected with the friction coefficient and imaginary springs, and the complex eigenvalue analysis was applied on the closed-loop coupling model to calculate the braking noise tendency, etc. In consequence, the relationships between temperature and two key factors (coupling stiffness and friction coefficient) were investigated. The temperature-dependent contact coupling stiffness and friction coefficient were substituted into the proposed model to predict the noise tendencies, the noise tendencies in different frequency bands varying with temperature were obtained. Finally, the effective temperature range during the actual braking process was extracted from the thermodynamic simulation. Considering the effective temperature range, the modified closed-loop coupling model could accurately identify 87.5% braking noise tendencies, and reach a good consistency with test results. (c) 2020 Elsevier Ltd. All rights reserved.
关键词 ：
Braking noise tendency Braking noise tendency Contact coupling stiffness Contact coupling stiffness Effective temperature range Effective temperature range Friction coefficient Friction coefficient Temperature-dependent Temperature-dependent
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| GB/T 7714 | Gao, Pu , Du, Yongchang , Ruan, Jiageng et al. Temperature-dependent noise tendency prediction of the disc braking system [J]. | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2021 , 149 . |
| MLA | Gao, Pu et al. "Temperature-dependent noise tendency prediction of the disc braking system" . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING 149 (2021) . |
| APA | Gao, Pu , Du, Yongchang , Ruan, Jiageng , Yan, Pengfei . Temperature-dependent noise tendency prediction of the disc braking system . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2021 , 149 . |
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摘要 ：
Thorough understanding of intergranular cracking mechanism is essential and important for developing superior layered cathodes. As a chemomechanical failure, crack's nucleation and evolution are affected mainly by cycling protocols, but it is still lacking direct and accurate observations. Herein, we develop an experimental protocol to visualize the cracking evolution process by tracing the same secondary particles. Further combining large area cross-sectional observations, we identify two distinctive cracking mechanisms due to different state of charge (SOC). At low SOC, chronic fatigue cracking is dominant. At high SOC, particle bursting makes intergranular cracks quickly saturated during the initial cycles, causing battery rapid performance decay in the beginning. We further validate that cracks are nucleated at the end of charging process and it is the discharging that leads to high density of cracks. Managing individual secondary particle below the critical SOC to prevent particle bursting is essential for achieving high cycling stability of Ni-rich layered cathodes.
关键词 ：
Cracking Cracking Grain boundary Grain boundary Layered cathode Layered cathode Lithium ion battery Lithium ion battery SEM SEM
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| GB/T 7714 | Wu, Haoqi , Qin, Changdong , Wang, Kuan et al. Revealing two distinctive intergranular cracking mechanisms of Ni-rich layered cathode by cross-sectional scanning electron microscopy [J]. | JOURNAL OF POWER SOURCES , 2021 , 503 . |
| MLA | Wu, Haoqi et al. "Revealing two distinctive intergranular cracking mechanisms of Ni-rich layered cathode by cross-sectional scanning electron microscopy" . | JOURNAL OF POWER SOURCES 503 (2021) . |
| APA | Wu, Haoqi , Qin, Changdong , Wang, Kuan , Han, Xiao , Sui, Manling , Yan, Pengfei . Revealing two distinctive intergranular cracking mechanisms of Ni-rich layered cathode by cross-sectional scanning electron microscopy . | JOURNAL OF POWER SOURCES , 2021 , 503 . |
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