新一代高比能量锂离子电池富锂氧化物正极材料的研究进展

发布时间：2018-06-01 22:41

本文选题：锂离子电池 + 高比容量正极材料　；参考：《材料导报》2017年11期

【摘要】：富锂氧化物xLi_2MnO_3·(1-x)LiMO_2(M为Co、Ni、Mn等)的比容量可达250~300mAh/g,是高比能量锂离子电池正极材料的首选之一。介绍了材料的晶体结构、嵌/脱锂机制和充放电过程中发生的结构相变,分析讨论了材料出现首次不可逆容量大、电压和容量衰减快、倍率性能和低温性能较差等问题的原因,阐述了材料的合成方法及改性技术,如表面包覆、离子掺杂、形貌和晶面调控以及合成层状相-尖晶石相共生结构的异质材料等。最后从基础研究和应用研究两个方面展望了富锂氧化物材料的发展前景。
[Abstract]:The specific capacity of lithium-rich oxide xLi_2MnO_3 + 1-xLiMO2M is as high as 250 ~ 300mAh/ g, which is one of the preferred cathode materials for high-specific energy lithium-ion batteries. The crystal structure of the material, the mechanism of intercalation / delithiation and the structural phase transition during charge and discharge are introduced. The reasons for the first irreversible capacity of the material, the fast attenuation of voltage and capacity, the poor rate performance and low temperature performance are analyzed and discussed. The synthetic methods and modification techniques of the materials, such as surface coating, ion doping, morphology and crystal surface control, and the synthesis of layered phase spinel symbiotic heterostructures were reviewed. At last, the development prospect of lithium-rich oxide materials is prospected from two aspects: basic research and application research.
【作者单位】：中国科学院大连化学物理研究所先进二次电池研究组;中国科学院大学;
【基金】：国家高技术研究发展计划(863计划)(2013AA050901)
【分类号】：TM912;TQ131.11

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