材料科学技术(英文版)2022，Vol.102Issue(7) ：72-79.

An advanced cathode composite for co-utilization of cations and anions in lithium batteries

Xiao-Tong Wang Yang Yang Jin-Zhi Guo Zhen-Yi Gu Edison Huixiang Ang Zhong-Hui Sun Wen-Hao Li Hao-Jie Liang Xing-Long Wu
材料科学技术(英文版)2022，Vol.102Issue(7) ：72-79.
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An advanced cathode composite for co-utilization of cations and anions in lithium batteries

Xiao-Tong Wang 1Yang Yang 2Jin-Zhi Guo 1Zhen-Yi Gu 1Edison Huixiang Ang 3Zhong-Hui Sun 4Wen-Hao Li 1Hao-Jie Liang 1Xing-Long Wu5
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作者信息

  • 1. MOE Key Laboratory for UV Light-Emitting Materials and Technology,Northeast Normal University,Changchun 130024,China
  • 2. Faculty of Chemistry,Northeast Normal University,Changchun 130024,China
  • 3. Natural Sciences and Science Education,National Institute of Education,Nanyang Technological University,Singapore 637616,Singapore
  • 4. Center for Advanced Analytical Science,c/o School of Chemistry and Chemical Engineering,c/o MOE Key Laboratory for Water Quality and Conservation of the Pearl River Delta,Guangzhou University,Guangzhou 510006,China
  • 5. MOE Key Laboratory for UV Light-Emitting Materials and Technology,Northeast Normal University,Changchun 130024,China;Faculty of Chemistry,Northeast Normal University,Changchun 130024,China
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Abstract

Anions in the electrolyte are usually ignored in conventional"rocking-chair"batteries because only cationic de-/intercalation is considered.An ingenious scheme combining LiMn0.7Fe0.3PO4(LMFP@C)and graphite as a hybrid cathode for lithium-ion batteries(LIBs)is elaborately designed in order to exploit the potential value of anions for battery performance.The hybrid cathode has a higher conductivity and energy density than any of the individual components,allowing for the co-utilization of cations and an-ions through the de-/intercalation of Li+and PF6-over a wide voltage range.The optimal compound with a weight mix ratio of LMFP@C∶ graphite=5∶ 1 can deliver the highest specific capacity of nearly 140 mA h/g at 0.1 C and the highest voltage plateau of around 4.95 V by adjusting the appropriate mixing ratio.In addition,cyclic voltammetry was used to investigate the electrode kinetics of Li+and PF6-dif-fusion in the hybrid compound at various scan rates.In situ X-ray diffraction is also performed to further demonstrate the structural evolution of the hybrid cathode during the charge/discharge process.

Key words

Lithium Batteries/Cathode/Anion De-/Intercalation/Graphite/LiMn0.7Fe0.3PO4

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基金项目

National Natural Science Foundation of China(91963118)

National Natural Science Foundation of China(52173246)

Science Technology Program of Jilin Province(20200201066JC)

111 Project(B13013)

出版年

2022
材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI
影响因子：0.657
ISSN：1005-0302
参考文献量36
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