Research progress on coating modification of lithium-rich cathode materials for lithium ion batteries
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摘要: 随着新能源汽车及储能行业的快速发展,传统正极材料难以满足人们对电池高能量、高密度锂电池的要求。富含Li和Mn的层状氧化物xLi2MnO3·(1-x)LiMO2(M=Ni,Mn,Co),其高比容量可超过250mAh/g,有希望成为下一代锂离子电池最理想的正极材料。但是,富锂材料仍存在首次循环不可逆容量高、循环性能差、倍率容量低等问题,为解决这些问题,本文阐述了富锂正极材料的结构和电化学反应之间的构效关系,讨论了金属氧化物、金属氟化物、碳、导电聚合物和锂离子导体等涂层材料对富锂正极材料电化学性能的影响规律,同时还对以上涂层在富锂正极材料的作用机理的研究进展进行了总结。最后,我们对锂离子电池富锂正极材料的包覆改性的未来发展发现作出展望。Abstract: With the rapid development of new energy vehicles and energy storage industry, traditional anode materials are difficult to meet people's requirements of high energy and high density for lithium ion batteries. The layered oxide xLi2MnO3· (1-x) LiMO2 (M=Ni, Mn, Co) rich in Li and Mn is expected to be the most ideal anode material for the next generation of lithium ion batteries due to its high specific capacity exceeding 250mAh/g. However, the Li-rich materials still suffer from high irreversible capacity loss at the first cycle, , poor cycle performance, and inferior rate capacity. To solve these problems, this paper expounds the lithium-rich cathode material structure and electrochemical reaction between the structure-activity relationship, discusses the role of the metal oxides, metal fluoride, carbon, conductive polymer and lithium ion conductors as coating material on the influence electrochemical performance of lithium-ion battery cathode materials. Besides, we also summarize the research progress of the above coating on the mechanism of lithium-ion battery cahode materials. Finally, the future development of coating modification of lithium-rich cathode materials for lithium ion batteries is prospected.
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Key words:
- lithium ion batteries /
- Li-rich materials /
- coating modification /
- rate performance /
- cycle stability
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