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学者姓名：闫鹏飞
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摘要 ：
Polycrystalline Ni-rich layered lithium transition metal oxides are one of the most promising cathode materials for next-generation high energy density lithium-ion batteries, yet they are still facing many challenges, especially for the cycling induced structural degradations. Intergranular cracking has been identified as one of the most crucial degradations, and grain boundary (GB) engineering has been demonstrated to be an effective countering strategy. Herein, we report a GB modification protocol that can realize not only improved GB stability but also interfacial reaction kinetics, realizing much improved cycling performance of NCM811. The simple and effective solution method can incorporate Ti-dopant into GBs and secondary particle surface, realizing the increase of the capacity retention from 79.5% to 93.5% at 3.0-4.5 V after 100 cycles, and its high voltage (4.7 V) and high temperature (55 degrees C) cycling stability are also significantly improved. Comprehensive microstructure and electrochemical characterizations of the samples before and after cycling are conducted to reveal the underlying mechanisms, validating that both interfacial degradations and bulk failures have been effectively mitigated. This work provides an effective protocol in the modification of GBs and interfaces of polycrystalline battery materials, which is promising and feasible for industrial mass-production application.
关键词 ：
grain boundary grain boundary electron microscopy electron microscopy layeredcathode layeredcathode lithium-ion battery lithium-ion battery Ti doping Ti doping
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| GB/T 7714 | Huang, Kai , Mu, Xulin , Ding, Yang et al. Ti-Modification of Grain Boundaries for Enhanced High Voltage Cycling Stability of NCM811 [J]. | ACS APPLIED ENERGY MATERIALS , 2024 , 7 (11) : 4856-4865 . |
| MLA | Huang, Kai et al. "Ti-Modification of Grain Boundaries for Enhanced High Voltage Cycling Stability of NCM811" . | ACS APPLIED ENERGY MATERIALS 7 . 11 (2024) : 4856-4865 . |
| APA | Huang, Kai , Mu, Xulin , Ding, Yang , Li, Jinhui , Sui, Manling , Yan, Pengfei . Ti-Modification of Grain Boundaries for Enhanced High Voltage Cycling Stability of NCM811 . | ACS APPLIED ENERGY MATERIALS , 2024 , 7 (11) , 4856-4865 . |
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摘要 ：
Constructing robust surface and bulk structure is the prerequisite for realizing high performance high voltage LiCoO2 (LCO). Herein, we manage to synthesize a surface Mg -doping and bulk Al -doping coreshell structured LCO, which demonstrates excellent cycling performance. Half -cell shows 94.2% capacity retention after 100 cycles at 3.0-4.6 V (vs. Li/Li+) cycling, and no capacity decay after 300 cycles for fullcell test (3.0-4.55 V). Based on comprehensive microanalysis and theoretical calculations, the degradation mechanisms and doping effects are systematically revealed. For the undoped LCO, high voltage cycling induces severe interfacial and bulk degradations, where cracks, stripe defects, fatigue H2 phase, and spinel phase are identified in grain bulk. For the doped LCO, Mg -doped surface shell can suppress the interfacial degradations, which not only stabilizes the surface structure by forming a thin rock -salt layer but also significantly improves the electronic conductivity, thus enabling superior rate performance. Bulk Al -doping can suppress the lattice "breathing" effect and the detrimental H3 to H1-3 phase transition, which minimizes the internal strain and defects growth, maintaining the layered structure after prolonged cycling. Combining theoretical calculations, this work deepens our understanding of the doping effects of Mg and Al, which is valuable in guiding the future material design of high voltage LCO. (c) 2024 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
关键词 ：
Lithium-ion battery Lithium-ion battery High-voltage LiCoO2 High-voltage LiCoO2 Doping effect Doping effect Failure mechanism Failure mechanism Electron microscopy Electron microscopy
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| GB/T 7714 | Xia, Yueming , Feng, Jianrui , Li, Jinhui et al. Selective core-shell doping enabling high performance 4.6 V-LiCoO2 [J]. | JOURNAL OF ENERGY CHEMISTRY , 2024 , 95 : 684-693 . |
| MLA | Xia, Yueming et al. "Selective core-shell doping enabling high performance 4.6 V-LiCoO2" . | JOURNAL OF ENERGY CHEMISTRY 95 (2024) : 684-693 . |
| APA | Xia, Yueming , Feng, Jianrui , Li, Jinhui , Li, Yan , Zhang, Zhengfeng , Wang, Xiaoqi et al. Selective core-shell doping enabling high performance 4.6 V-LiCoO2 . | JOURNAL OF ENERGY CHEMISTRY , 2024 , 95 , 684-693 . |
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摘要 ：
Ni-rich LiNixCoyMn1-x-yO2 (NCM) layered oxides are low-cost high-energy density cathode materials, but plagued by its poor thermal stability incurred safety concerns. The thermal failure process of the layered cathode is accompanied by heat generation and oxygen release, which drives the battery into thermal runaway (TR). Aiming to fully understand the TR process and the structure evolution, this work applies diverse characterization techniques onto a polycrystalline Ni-rich layered cathode (LiNi0.83Mn0.05Co0.12O2 (PCN83)) to comprehensively investigate its thermal failure process at multiple scales. From macro level, we validate that it is the cathode thermal failure that drives the battery from the heat accumulation stage into TR in adiabatic conditions. From micro level, transmission electron microscopy (TEM) verifies that the thermal failure of PCN83 starts from 150 degrees C, which is much lower than the TR temperature measured from macro level tests. We reveal that the PCN83 cathode experiences sequential phase transitions before the TR, where the phase transition mechanism is illustrated from the atomic scale and the pore evolution process is unraveled. In situ heating TEM further reveals that thermal failure is preferentially initiated from grain boundaries and defect regions. These findings provide an in-depth understanding of the whole thermal failure process of NMC-based layered cathode materials and sheds new lights on the rational design of Ni-rich cathode materials with improved thermal safety.
关键词 ：
Ni-rich layered cathode Ni-rich layered cathode Lithium-ion battery Lithium-ion battery Electron microscopy Electron microscopy Phase transition Phase transition Thermal runaway Thermal runaway
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| GB/T 7714 | Ding, Yang , Li, Yan , Xu, Ruoyu et al. Cross-scale deciphering thermal failure process of Ni-rich layered cathode [J]. | NANO ENERGY , 2024 , 126 . |
| MLA | Ding, Yang et al. "Cross-scale deciphering thermal failure process of Ni-rich layered cathode" . | NANO ENERGY 126 (2024) . |
| APA | Ding, Yang , Li, Yan , Xu, Ruoyu , Han, Xiao , Huang, Kai , Ke, Xiaoxing et al. Cross-scale deciphering thermal failure process of Ni-rich layered cathode . | NANO ENERGY , 2024 , 126 . |
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摘要 ：
Nickel-rich layered lithium transition metal oxides, LiNixCoyMn1-x-yO2, are key cathode materials for high-energy lithium-ion batteries owing to their high specific capacity. However, the commercial deployment of nickel-rich oxides is hampered by their parasitic reactions and the associated safety issues at high voltages. Developing a stable cathode-electrolyte interphase (CEI) is a promising strategy to overcome this problem. Herein, we report a novel approach, based on the in situ polymerization reaction, to build a protective polymer skin on LiNi0.6Co0.2Mn0.6O2 (NCM622) cathode materials. The artificial CEI skin was found to drastically improve the intrinsic thermal stability, mitigate the evolution of phase transition, and effectively inhibit the associated parasitic reactions between cathodes and the electrolyte in the high-charge states. This coating approach leads to enhanced capacity retention and battery safety under high-voltage operations. The CEI design concept offers a promising strategy for develop advanced nickel-rich cathodes for batteries.
关键词 ：
Cathode Cathode High voltage High voltage Thermal runaway Thermal runaway Lithium-ion batteries Lithium-ion batteries
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| GB/T 7714 | Li, Yan , Li, Jinhui , Ding, Yang et al. Toward a high-voltage practical lithium ion batteries with ultraconformal interphases and enhanced battery safety [J]. | ENERGY STORAGE MATERIALS , 2024 , 65 . |
| MLA | Li, Yan et al. "Toward a high-voltage practical lithium ion batteries with ultraconformal interphases and enhanced battery safety" . | ENERGY STORAGE MATERIALS 65 (2024) . |
| APA | Li, Yan , Li, Jinhui , Ding, Yang , Feng, Xuning , Liu, Xiang , Yan, Pengfei et al. Toward a high-voltage practical lithium ion batteries with ultraconformal interphases and enhanced battery safety . | ENERGY STORAGE MATERIALS , 2024 , 65 . |
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摘要 ：
本发明涉及一种钠离子电池层状正极材料的制备方法，属于钠离子电池技术领域。本发明将Na2CO3、NiO、Mn2O3、掺杂金属氧化物混合均匀得到混合粉A，混合粉A加入到易挥发溶剂中搅拌混合得到浆料A，浆料A烘干去除易挥发溶剂后压片，再置于温度500～1200℃烧结5～30h，随炉冷却至温度为不高于150℃得到正极材料粉末；将正极材料粉末、PVDF、乙炔黑混合均匀得到混合粉B，混合粉B中加入N‑甲基吡咯烷酮进行调浆得到浆料B，然后将浆料B涂覆在铝箔上，真空干燥得到极片；以极片为正极，金属钠或软碳为负极，NaClO4电解液为电池电解液，组装成钠离子电池并循环1～50圈，拆出电极得到循环后的极片，循环后的极片经热处理得到钠离子电池层状正极。该电极具有优异的循环稳定性。
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| GB/T 7714 | 程苏兰 , 李金辉 , 隋曼龄 et al. 一种钠离子电池层状正极材料的制备方法 : CN202310443754.3[P]. | 2023-04-24 . |
| MLA | 程苏兰 et al. "一种钠离子电池层状正极材料的制备方法" : CN202310443754.3. | 2023-04-24 . |
| APA | 程苏兰 , 李金辉 , 隋曼龄 , 闫鹏飞 . 一种钠离子电池层状正极材料的制备方法 : CN202310443754.3. | 2023-04-24 . |
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摘要 ：
Cathode electrolyte interphase (CEI) layer plays a crucial role in determining the electrochemical perfor-mance of lithium-ion batteries. Limited by the sensitive nature of CEI and the lack of characterization techniques, its dynamic evolution during cycling, its formation mechanism, and its specific impact on battery performance are not yet fully understood. Herein, we systematically investigate the dynamic evo-lution of CEI layer and its critical effect on the cycling performance of LiCoO2 cathode by diverse charac-terization techniques. We find that cycling voltage plays a key role in affecting CEI formation and evolution, and a critical potential (4.05 V vs. Li) is identified, which acts as the switching potential between CEI deposition and decomposition. We show that CEI starts deposition in the discharge process when the potential is below 4.05 V, and CEI decomposition occurs when the potential is higher than 4.05 V. When the battery is cycled below such a critical potential, a stable CEI layer is developed, which leads to superior cycling stability. When the battery is cycled above such a critical potential, a CEI-free cathode interface is observed, which also demonstrates good cycle stability. However, when the critical potential falls in the cycling voltage range, CEI deposition and decomposition are repeatedly switched on during cycling, leading to the dynamically unstable CEI layer. The unstable CEI layer causes continuous interfacial reaction and degradation, resulting in battery performance decay. Our work deepens the understanding of the CEI formation and evolution mechanisms, and clarifies the critical effect of CEI layer on cycling performance, which provides new insights into stabilizing the electrode-electrolyte interface for high-performance rechargeable batteries.(c) 2023 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
关键词 ：
LiCoO2 LiCoO2 Electron microscopy Electron microscopy XPS XPS Lithium-ion battery Lithium-ion battery CEI CEI
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| GB/T 7714 | Zhang, Zhengfeng , Qin, Changdong , Wang, Kuan et al. Deciphering the critical effect of cathode-electrolyte interphase by revealing its dynamic evolution [J]. | JOURNAL OF ENERGY CHEMISTRY , 2023 , 81 : 192-199 . |
| MLA | Zhang, Zhengfeng et al. "Deciphering the critical effect of cathode-electrolyte interphase by revealing its dynamic evolution" . | JOURNAL OF ENERGY CHEMISTRY 81 (2023) : 192-199 . |
| APA | Zhang, Zhengfeng , Qin, Changdong , Wang, Kuan , Han, Xiao , Li, Jinhui , Sui, Manling et al. Deciphering the critical effect of cathode-electrolyte interphase by revealing its dynamic evolution . | JOURNAL OF ENERGY CHEMISTRY , 2023 , 81 , 192-199 . |
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摘要 ：
Exploring the structure transformation mechanism of the spent cathodes during their regeneration process is the key to optimizing the processing protocol. The spent cathode materials are in different state of health (SOH) due to their different operation history, which leads to the challenge of restoring them in one-pot. Herein, to address the effect of SOH on the direct regeneration protocol, we systematically investigated the spent LiCoO2 (LCO) cathode with low and high SOH. We find that lithium-deficiency and Al impurity are the two important factors in affecting the regeneration quality of the spent LCO. Lithium-deficiency can cause void defects and disordered lattice structure. Al impurity is brought to the LCO surface during lithium replenishment process, which further diffuses into the LCO subsurface layer during the following high temperature sintering. Based on our understanding of the regeneration process, the regeneration protocol is optimized accordingly, which can successfully restore the spent LCO with different SOH.
关键词 ：
State of health State of health Direct regeneration Direct regeneration TEM TEM LiCoO2 LiCoO2 Lithium ion battery Lithium ion battery
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| GB/T 7714 | Mu, Xulin , Huang, Kai , Zhu, Genxiang et al. Advanced characterization guiding rational design of regeneration protocol for spent-LiCoO2 [J]. | NANO ENERGY , 2023 , 112 . |
| MLA | Mu, Xulin et al. "Advanced characterization guiding rational design of regeneration protocol for spent-LiCoO2" . | NANO ENERGY 112 (2023) . |
| APA | Mu, Xulin , Huang, Kai , Zhu, Genxiang , Li, Yan , Liu, Conghui , Hui, Xiaojuan et al. Advanced characterization guiding rational design of regeneration protocol for spent-LiCoO2 . | NANO ENERGY , 2023 , 112 . |
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摘要 ：
Antimony-based oxides with conversion-alloying/dealloying mechanism have attracted great attentions as alternative anode materials for lithium/sodium-ion batteries due to their high theoretical capacities. However, slow reaction kinetics, inherent poor conductivity and large volume change severely inhibit their practical application. Herein, a novel composite with FeSbO4-Sb2O4 hetero-nanocrystals anchored on reduced graphene oxide (rGO) sheets is designed and successfully constructed by a facile solvothermal method. The intense interaction between Fe3+ and Sb5+ oxidized from Sb3+ by graphene oxide (GO) boosts priority formation of rutile FeSbO4 nanoparticles. And the excess Sb3+ and Sb5+ subsequently generate nano-sized cervantite Sb2O4 to form FeSbO4-Sb2O4 hetero-interface. Such unique structure not only can enhance electrical conductivity and structural stability of electrode, but also shorten diffusion distance of lithium/sodium ions during discharge/charge processes. Moreover, the in-situ generated Fe during electrochemical reaction can boost lithium/sodium release from Li2O/Na2O. Attributed to the unique structure, the as-obtained FeSbO4-Sb2O4/rGO-200 electrode delivers greatly improved electrochemical performance for both lithium and sodium storage, including large reversible capacities, high rate capability, and superior long-term cycling stability. This work provides an efficient route to rationally design and synthesize hetero-structural composites boosting lithium-/sodium-storage properties.
关键词 ：
Hetero-nanocrystal Hetero-nanocrystal Synthesis Synthesis Lithium/sodium-ion battery Lithium/sodium-ion battery Electrochemical performance Electrochemical performance Anode Anode
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| GB/T 7714 | Zhou, Xiaozhong , Wang, Aixia , Zheng, Xiaoyan et al. Construction of FeSbO4-Sb2O4 hetero-nanocrystals anchored on reduced graphene oxide sheets for superior lithium and sodium storage [J]. | APPLIED SURFACE SCIENCE , 2023 , 648 . |
| MLA | Zhou, Xiaozhong et al. "Construction of FeSbO4-Sb2O4 hetero-nanocrystals anchored on reduced graphene oxide sheets for superior lithium and sodium storage" . | APPLIED SURFACE SCIENCE 648 (2023) . |
| APA | Zhou, Xiaozhong , Wang, Aixia , Zheng, Xiaoyan , Zhang, Zhengfeng , Song, Jinxu , Deng, Hongling et al. Construction of FeSbO4-Sb2O4 hetero-nanocrystals anchored on reduced graphene oxide sheets for superior lithium and sodium storage . | APPLIED SURFACE SCIENCE , 2023 , 648 . |
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摘要 ：
Nitriles as efficient electrolyte additives are widely used in high-voltage lithium-ion batteries. However, their working mechanisms are still mysterious, especially in practical high-voltage LiCoO2 pouch lithium-ion batteries. Herein, we adopt a tridentate ligand-containing 1,3,6-hexanetricarbonitrile (HTCN) as an effective electrolyte additive to shed light on the mechanism of stabilizing high-voltage LiCoO2 cathode (4.5 V) through nitrites. The LiCoO2 lgraphite pouch cells with the HTCN additive electrolyte possess superior cycling performance, 90% retention of the initial capacity after 800 cycles at 25 degrees C, and 72% retention after 500 cycles at 45 degrees C, which is feasible for practical application. Such an excellent cycling performance can be attributed to the stable interface: The HTCN molecules with strong electron-donating ability participate in the construction of cathode-electrolyte interphase (CEI) through coordinating with Co ions, which suppresses the decomposition of electrolyte and improves the structural stability of LiCoO2 during cycling. In summary, the work recognizes a coordinating-based interphase-forming mechanism as an effective strategy to optimize the performance of high voltage LiCoO2 cathode with appropriate electrolyte additives for practical pouch batteries.
关键词 ：
high voltage high voltage LiCoO2 LiCoO2 pouch cell pouch cell nitrile additive nitrile additive electrolyte modificationi electrolyte modificationi interface adsorption interface adsorption
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| GB/T 7714 | Tang, Chao , Chen, Yawei , Zhang, Zhengfeng et al. Stable cycling of practical high-voltage LiCoO2 pouch cell via electrolyte modification [J]. | NANO RESEARCH , 2022 , 16 (3) : 3864-3871 . |
| MLA | Tang, Chao et al. "Stable cycling of practical high-voltage LiCoO2 pouch cell via electrolyte modification" . | NANO RESEARCH 16 . 3 (2022) : 3864-3871 . |
| APA | Tang, Chao , Chen, Yawei , Zhang, Zhengfeng , Li, Wenqiang , Jian, Junhua , Jie, Yulin et al. Stable cycling of practical high-voltage LiCoO2 pouch cell via electrolyte modification . | NANO RESEARCH , 2022 , 16 (3) , 3864-3871 . |
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摘要 ：
本发明涉及一种废旧锂电池正极材料剥离并直接再生的方法，属于锂电池正极技术领域。本发明机械拆解废旧锂电池正极得到含Al集流体的正极极片，在含Al集流体的正极极片表面喷涂锂盐溶液形成锂盐薄膜，烘干得到补锂正极极片；在空气氛围下，补锂正极极片进行低温焙烧，敲打物理分离得到废旧LiCoO2正极材料，废旧LiCoO2正极材料研磨过筛得到粉末A；将粉末A加入到NaOH溶液中碱浸除铝得到粉末B；将过量锂盐加入到粉末B中混合均匀，在空气氛围中高温烧结得到再生锂电池正极材料。相比较传统正极材料剥离的方式，低温补锂法高效的将正极材料与铝箔分离，所再生的LiCoO2正极材料满足工业化应用。
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| GB/T 7714 | 闫鹏飞 , 隋曼龄 , 牟许霖 et al. 一种废旧锂电池正极材料剥离并直接再生的方法 : CN202211601633.9[P]. | 2022-12-13 . |
| MLA | 闫鹏飞 et al. "一种废旧锂电池正极材料剥离并直接再生的方法" : CN202211601633.9. | 2022-12-13 . |
| APA | 闫鹏飞 , 隋曼龄 , 牟许霖 , 董恩华 , 黄开 . 一种废旧锂电池正极材料剥离并直接再生的方法 : CN202211601633.9. | 2022-12-13 . |
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