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摘要 ：
为了解决高比能富锂材料电压衰退、首圈库仑效率低、倍率性能差等问题,本文通过简单的固相烧结法合成P2-O3复合相富锂正极材料。该材料利用P2相在首次充放电过程中转化为O2相,避免过渡金属迁移,有效地降低了循环过程中的电压衰退,极大地提高了首圈库仑效率和倍率性能。电化学性能测试表明,在2.0～4.6 V以0.1 C (1 C=200 mA/g)电流进行充放电,P2-O3复合相富锂正极材料可以提供高于290 mA·h/g的比容量,首圈库仑效率高达97%。1 C放电比容量约为240 mA·h/g,100圈容量保持率接近80%;100圈平均电压衰退小于170 m V。该复合相富锂正极材料合成制备简单;在...
关键词 ：
首圈库仑效率 首圈库仑效率 复合相 复合相 电压衰退 电压衰退 富锂锰基正极材料 富锂锰基正极材料
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| GB/T 7714 | 张建宇 , 鲁理平 , 于志辉 et al. P2-O3复合相富锂锰基正极材料的合成及性能研究 [J]. | 储能科学与技术 , 2020 , 9 (02) : 346-352 . |
| MLA | 张建宇 et al. "P2-O3复合相富锂锰基正极材料的合成及性能研究" . | 储能科学与技术 9 . 02 (2020) : 346-352 . |
| APA | 张建宇 , 鲁理平 , 于志辉 , 宋进 , 夏定国 . P2-O3复合相富锂锰基正极材料的合成及性能研究 . | 储能科学与技术 , 2020 , 9 (02) , 346-352 . |
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摘要 ：
制备了一种有序层状与无序结构复合的锂离子电池富锂正极材料Li1.2Ni0.2Mn(0.6-x)TixO2(0＜x＜0.6),通过镍元素激发电极材料的电化学活性;引入Li2MnO3,优化热处理温度,调控有序层状-无序结构复合的相比例.所制备的Li1.2Ni0.2Mn0.4Ti0.2O2在经过700℃热处理后比容量达到341 mAh/g,比能量达到1 018 Wh/kg.
关键词 ：
电压滞后 电压滞后 有序与无序复合结构 有序与无序复合结构 富锂正极材料 富锂正极材料 锂离子电池 锂离子电池
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| GB/T 7714 | 于志辉 , 赵子萌 , 李彪 et al. 有序-无序结构复合的富锂正极材料 [J]. | 电源技术 , 2020 , 44 (9) : 1241-1245 . |
| MLA | 于志辉 et al. "有序-无序结构复合的富锂正极材料" . | 电源技术 44 . 9 (2020) : 1241-1245 . |
| APA | 于志辉 , 赵子萌 , 李彪 , 夏定国 . 有序-无序结构复合的富锂正极材料 . | 电源技术 , 2020 , 44 (9) , 1241-1245 . |
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摘要 ：
Li-rich layered oxide cathode materials show high capacities in lithium-ion batteries owing to the contribution of the oxygen redox reaction. However, structural accommodation of this reaction usually results in O-O dimerization, leading to oxygen release and poor electrochemical performance. In this study, we propose a new structural response mechanism inhibiting O-O dimerization for the oxygen redox reaction by tuning the local symmetry around the oxygen ions. Compared with regular Li2RuO3, the structural response of the as-prepared local-symmetry-tuned Li2RuO3 to the oxygen redox reaction involves the telescopic O-Ru-O configuration rather than O-O dimerization, which inhibits oxygen release, enabling significantly enhanced cycling stability and negligible voltage decay. This discovery of the new structural response mechanism for the oxygen redox reaction will provide a new scope for the strategy of enhancing the anionic redox stability, paving unexplored pathways toward further development of high capacity Li-rich layered oxides. Li-rich layered oxide cathodes show high capacities in Li-ion batteries but suffer from structural degradation via O-O dimerization. Here, the authors present local-symmetry-tuned Li2RuO3 with oxygen redox involving a telescopic O-Ru-O configuration avoiding O-2 release, enhancing cycling stability.
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| GB/T 7714 | Ning, Fanghua , Li, Biao , Song, Jin et al. Inhibition of oxygen dimerization by local symmetry tuning in Li-rich layered oxides for improved stability [J]. | NATURE COMMUNICATIONS , 2020 , 11 (1) . |
| MLA | Ning, Fanghua et al. "Inhibition of oxygen dimerization by local symmetry tuning in Li-rich layered oxides for improved stability" . | NATURE COMMUNICATIONS 11 . 1 (2020) . |
| APA | Ning, Fanghua , Li, Biao , Song, Jin , Zuo, Yuxuan , Shang, Huaifang , Zhao, Zimeng et al. Inhibition of oxygen dimerization by local symmetry tuning in Li-rich layered oxides for improved stability . | NATURE COMMUNICATIONS , 2020 , 11 (1) . |
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摘要 ：
Conventional batteries (except redox flow batteries) react by involving only their electrode redox centers, with electrolyte ions shuttled between the cathode and the anode. However, this chemistry causes large electronic and structural changes in the bulk of the electrode materials, leading to performance degradation. Herein, we report that electrolytic-anion-redox adsorption pseudocapacitance, relayed by lithium intercalation in lithium-free transition metal oxide electrodes, can be exploited to boost the total energy density of a battery. Focused on the study of Mn3O4, we show that this pseudocapacitance is processed by the reversible adsorption/desorption of PF6- on the surface of transition metal oxides, with charge transfer between Mn3O4 and PF6- through Mn-F bond while fluoride ions acting as redox centers. This new electrolytic-anion-redox chemistry provides greater design freedom for high-capacity energy storage devices since it only involves a specific electrode surface and the electrolyte anion, rather than specially crystallized compounds for bulk reactions.
关键词 ：
Adsorption pseudocapacitance Adsorption pseudocapacitance Anionic redox Anionic redox Electrolyte anions Electrolyte anions Lithium-ion batteries Lithium-ion batteries Partial charge transfer Partial charge transfer Specific adsorption Specific adsorption
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| GB/T 7714 | Li, Biao , Wang, Yifeng , Jiang, Ning et al. Electrolytic-anion-redox adsorption pseudocapacitance in nanosized lithium-free transition metal oxides as cathode materials for Li-ion batteries [J]. | NANO ENERGY , 2020 , 72 . |
| MLA | Li, Biao et al. "Electrolytic-anion-redox adsorption pseudocapacitance in nanosized lithium-free transition metal oxides as cathode materials for Li-ion batteries" . | NANO ENERGY 72 (2020) . |
| APA | Li, Biao , Wang, Yifeng , Jiang, Ning , An, Li , Song, Jin , Zuo, Yuxuan et al. Electrolytic-anion-redox adsorption pseudocapacitance in nanosized lithium-free transition metal oxides as cathode materials for Li-ion batteries . | NANO ENERGY , 2020 , 72 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Nano-ordered intermetallic compounds have generated great interest in fuel cell applications. However, the synthesis of non-preciousearly transition metal intermetallic nanoparticles remains a formidable challenge owing to the extremely oxyphilic nature and very negative reduction potentials. Here, we have successfully synthesized non-precious Co3Ta intermetallic nanoparticles, with uniform size of 5 nm. Atomic structural characterizations and X-ray absorption fine structure measurements confirm the atomically ordered intermetallic structure. As electrocatalysts for the hydrazine oxidation reaction, Co3Ta nanoparticles exhibit an onset potential of -0.086 V (vs. reversible hydrogen electrode) and two times higher specific activity relative to commercial Pt/C (+0.06 V), demonstrating the top-level performance among reported electrocatalysts. The Co-Ta bridge sites are identified as the location of the most active sites thanks to density functional theory calculations. The activation energy of the hydrogen dissociation step decreases significantly upon N2H4 adsorption on the Co-Ta bridge active sites, contributing to the significantly enhanced activity.
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| GB/T 7714 | Feng, Guang , An, Li , Li, Biao et al. Atomically ordered non-precious Co3Ta intermetallic nanoparticles as high-performance catalysts for hydrazine electrooxidation [J]. | NATURE COMMUNICATIONS , 2019 , 10 . |
| MLA | Feng, Guang et al. "Atomically ordered non-precious Co3Ta intermetallic nanoparticles as high-performance catalysts for hydrazine electrooxidation" . | NATURE COMMUNICATIONS 10 (2019) . |
| APA | Feng, Guang , An, Li , Li, Biao , Zuo, Yuxuan , Song, Jin , Ning, Fanghua et al. Atomically ordered non-precious Co3Ta intermetallic nanoparticles as high-performance catalysts for hydrazine electrooxidation . | NATURE COMMUNICATIONS , 2019 , 10 . |
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摘要 ：
A three-electron structural reaction for Na3V2O2(PO4)(2)F (Na3VOPF) in space group I4/mmm shows a priori stabilisation in terms of long-life in the voltage range of 2.0-4.5 V, with embedding of more than one sodium ion to generate Na5VOPF upon discharge to 1.0 V in the first cycle, thereby increasing the specific capacity from approximate to 170 mA h g(-1). The capacity of the crystals was 180 mA h g(-1) after 20 cycles. The results provide a probable route to improve fluorophosphate cathode performance.
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| GB/T 7714 | Peng, Manhua , Zhang, Dongtang , Wang, Xiayan et al. Three-electron reversible redox for a high-energy fluorophosphate cathode: Na3V2O2(PO4)(2)F [J]. | CHEMICAL COMMUNICATIONS , 2019 , 55 (27) : 3979-3982 . |
| MLA | Peng, Manhua et al. "Three-electron reversible redox for a high-energy fluorophosphate cathode: Na3V2O2(PO4)(2)F" . | CHEMICAL COMMUNICATIONS 55 . 27 (2019) : 3979-3982 . |
| APA | Peng, Manhua , Zhang, Dongtang , Wang, Xiayan , Xia, Dingguo , Sun, Yugang , Guo, Guangsheng . Three-electron reversible redox for a high-energy fluorophosphate cathode: Na3V2O2(PO4)(2)F . | CHEMICAL COMMUNICATIONS , 2019 , 55 (27) , 3979-3982 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Exploration of competitive electrocatalysts to replace Pt-based catalysts for oxygen reduction reaction (ORR) in fuel cells is one of the most promising strategies to confront the energy and environmental crises. Herein, we highlighted an FeCo alloy catalyst encapsulated in N-doped graphitic carbon nanotubes (FeCo@N-GCNT-FD) as a highly efficient non-precious electrocatalyst for the ORR. The FeCo@N-GCNT-FD catalyst exhibits a positive onset (0.96 V vs. RHE) and half-wave potential (0.88 V vs. RHE) as well as 5.6 times the specific activity of commercial Pt/C at 0.70 V in alkaline media. The excellent catalytic behavior of FeCo@N-GCNT-FD is attributed to the structural properties, including a large surface area, and the synergistic effect of FeCo alloy and N-GCNT, which guarantee a large number of accessible catalytic sites and rapid mass-transfer kinetics. Theoretical calculations further confirm that the strong synergistic and electronic effects, especially the FeCo-NG sites, provide a favorable local coordination environment and electronic structure and a lower oxygen absorbance energy. The improvement of ORR activity and durability of the catalyst by the synergistic and electronic effects between the metal and carbon provides a versatile approach for tuning the catalytic performance of non-noble electrocatalysts.
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| GB/T 7714 | An, Li , Jiang, Ning , Li, Biao et al. A highly active and durable iron/cobalt alloy catalyst encapsulated in N-doped graphitic carbon nanotubes for oxygen reduction reaction [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2018 , 6 (14) : 5962-5970 . |
| MLA | An, Li et al. "A highly active and durable iron/cobalt alloy catalyst encapsulated in N-doped graphitic carbon nanotubes for oxygen reduction reaction" . | JOURNAL OF MATERIALS CHEMISTRY A 6 . 14 (2018) : 5962-5970 . |
| APA | An, Li , Jiang, Ning , Li, Biao , Hua, Shixin , Fu, Yutong , Liu, Jiaxi et al. A highly active and durable iron/cobalt alloy catalyst encapsulated in N-doped graphitic carbon nanotubes for oxygen reduction reaction . | JOURNAL OF MATERIALS CHEMISTRY A , 2018 , 6 (14) , 5962-5970 . |
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摘要 ：
在球形SiO_2颗粒表面包覆适量的CuO,经还原得到铜包覆的多孔硅复合材料[p-Si@Cu(x)].利用X射线衍射、扫描电子显微镜、透射电子显微镜和比表面积分析等手段对样品的组成、物相结构、微观形貌和孔结构进行分析,并初步研究了材料的循环性能和倍率性能.结果表明,铜包覆量x=0.05时,在100 mA/g电流密度下,样品的首次放电容量为3596.9 mA·h/g,首次充电容量为2590.7 mA·h/g,首次库仑效率为72.03%;在1C倍率下可逆容量为1004.9 mA·h/g,0.1C倍率下循环100周后的可逆容量仍为1706.5mA·h/g,容量保持率为76.1%.
关键词 ：
多孔硅基材料 多孔硅基材料 锂离子电池 锂离子电池 铜包覆 铜包覆
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| GB/T 7714 | 于志辉 , 刘丹丹 , 寇艳娜 et al. 铜包覆多孔硅基材料p-Si@Cu(x)的制备与性能 [J]. | 高等学校化学学报 , 2017 , 38 (05) : 837-845 . |
| MLA | 于志辉 et al. "铜包覆多孔硅基材料p-Si@Cu(x)的制备与性能" . | 高等学校化学学报 38 . 05 (2017) : 837-845 . |
| APA | 于志辉 , 刘丹丹 , 寇艳娜 , 夏定国 . 铜包覆多孔硅基材料p-Si@Cu(x)的制备与性能 . | 高等学校化学学报 , 2017 , 38 (05) , 837-845 . |
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摘要 ：
Nanoscale p-Si@Cu(x)(x stands for the cladding amount of copper) was prepared by St ber method and magnesiothermic reduction method. The morphologies and structures of p-Si@Cu(x) alloy were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM)?transmission electron microscopy(TEM) and specific surface area analysis, and the cyclic performance and rate performace of the material were investigated. The results show that the first discharge and charge capacity of p-Si@Cu(0.05) are 3596.9 and 2590.7 mAh/g, respectively at 100 mA/g and the first coulomb efficiency is 72.03%; its cell cycle stability and rate performance of p-Si@Cu(0.05) are also the best, the reversible capacity is 1004.9 mA5h/g at 1C. The reversible capacity is 1706.5 mA5h/g at 0.1C after 100 times cycling and the capacity remaining rate is 76.1%.
关键词 ：
Copper cladding Copper cladding Lithium-ion battery Lithium-ion battery Porous silicon material Porous silicon material
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| GB/T 7714 | Yu Zhihui , Liu Dandan , Kou Yanna et al. Preparation and Properties of Nanoscale p-Si@Cu(x) [J]. | CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE , 2017 , 38 (5) : 837-845 . |
| MLA | Yu Zhihui et al. "Preparation and Properties of Nanoscale p-Si@Cu(x)" . | CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 38 . 5 (2017) : 837-845 . |
| APA | Yu Zhihui , Liu Dandan , Kou Yanna , Xia Dingguo . Preparation and Properties of Nanoscale p-Si@Cu(x) . | CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE , 2017 , 38 (5) , 837-845 . |
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摘要 ：
Novel hierarchical Ru-doped Na3V2O2(PO4)(2)F hollow microspheres were synthesized via a low -temperature solvothermal method. The individual unique microspheres were formed from assembly of numerous nanoparticles with diameters of 20-30 nm. When used as a cathode material for sodium -ion batteries (SIBs), the microspheres exhibited superior rate performance with a capacity of 72.6 mAh.g(-1) at 10 C. Furthermore, their rate performance-could be-significantly improved by-coating them-with a thin conductive RuO2 layer. Fot instance, high specific capacities of 102.5 mAh g(-1) and 44.9 mAh g(-1) were achieved at current rates of 20 C and 100 C, respectively. These materials exhibited impressive long-term cycling stability. A reversible capacity of approximately 55.0 mAh g(-1) was maintained even after 7500 charge/discharge cycles. Density functional theory (DFT) calculations increased our understanding of how H+ facilitates the formation of the hierarchical microsphere superstructure which is beneficial to achieve a good rate capability.
关键词 ：
Cathode Cathode Hollow microspheres Hollow microspheres Long cycling-stability Long cycling-stability Sodium-ion batteries Sodium-ion batteries Superior rate capability Superior rate capability
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| GB/T 7714 | Peng, Manhua , Zhang, Dongtang , Zheng, Limin et al. Hierarchical Ru-doped sodium vanadium fluorophosphates hollow microspheres as a cathode of enhanced superior rate capability and ultralong stability for sodium-ion batteries [J]. | NANO ENERGY , 2017 , 31 : 64-73 . |
| MLA | Peng, Manhua et al. "Hierarchical Ru-doped sodium vanadium fluorophosphates hollow microspheres as a cathode of enhanced superior rate capability and ultralong stability for sodium-ion batteries" . | NANO ENERGY 31 (2017) : 64-73 . |
| APA | Peng, Manhua , Zhang, Dongtang , Zheng, Limin , Wang, Xiayan , Lin, Yue , Xia, Dingguo et al. Hierarchical Ru-doped sodium vanadium fluorophosphates hollow microspheres as a cathode of enhanced superior rate capability and ultralong stability for sodium-ion batteries . | NANO ENERGY , 2017 , 31 , 64-73 . |
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