文档介绍：
合成方法对层状多元电池正极纳米材料性
能影响的研究#
周苇,靳泓,曹薇*
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(北京航空航天大学化学与环境学院,北京 100191)
摘要:利用溶液燃烧法,共沉淀法及溶胶-凝胶法分别制备 LiCoxNiyMn1-x-yO2 层状多元正
极材料,形貌、成分表征知此三种方法均合成了 200-400 nm 具有α-NaFeO2 结构的多元正
极材料。通过电化学性能测试,发现溶液燃烧法制备的 纳米三元正极
材料性能最佳, C 倍率下比放电容量可达 mAh/g,50 次循环后容量保持率可达
%,较好的性能可归于燃烧法提供的高温使产物具有更好结晶度及更稳定的纳米结构。
关键词:纳米材料;锂离子电池;正极材料;化学合成
中图分类号:O648
Study on the Influence of Synthetic Methods on Layered
Multi-Element Cathode Nanomaterials in Li-ion Batteries
Zhou Wei, Jin Hong, Cao Wei
(School of Chemistry and Environment, Beihang University, 100191)
Abstract: Three chemical methods were used to synthesize three kinds of layered multi-element
cathode nanomaterials (LiCoxNiyMn1-x-yO2) with particle size from 200 to 400 nm in the
structure of α-NaFeO2. The sample prepared by bustion method showed a better
electrochemical property in LIB measurements. The discharge capacity could reach mAh/g
and remained % of the capacity after 50 cycles at C. The better properties could be
ascribed to a higher temperature of bustion method, leading to better crystallinity and
more stable nanostructure.
Key words: Nanomaterial; Li-ion battery; Cathode Material; Chemical method
0 引言
钴酸锂(LiCoO2)是锂离子电池(LIB)层状正极材料的典型代表,理论容量为 mAh/g。
虽然是较成熟的商业材料,但存在容量低、循环稳定性差等问题,构造材料微纳结构是提高
性能的有效途径。因为纳米正极材料比表面积大,表面缺陷与孔隙多,增加了电极与电解液
的接触面积,改善了电极