LiNi1/3Co1/3Mn1/3O2表面包覆TiO2膜的微观结构及其储锂性能
首发时间:2012-11-22
摘要:锂离子电池正极材料LiNi1/3Co1/3Mn1/3O2综合性能优良,应用前景广阔。为避免LiNi1/3Co1/3Mn1/3O2与电解液界面处的不可逆化学反应,本文采用液相浸渍法在球形颗粒LiNi1/3Co1/3Mn1/3O2的表面包覆一层TiO2薄膜。微观结构分析表明,表面TiO2膜的厚度在100 nm以内,核体材料具有纯六方相结构。实验结果证明,表面TiO2膜能够有效提高正极材料的耐过充能力和循环稳定性。在截止电压为3.0-4.5V,充放电倍率为0.1C的条件下,TiO2表面包覆膜后正极活性物质50次循环的容量保持率提高了10%。
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Microstructure and lithium storage of LiNi1/3Co1/3Mn1/3O2 coated with TiO2 film
Abstract:LiNi1/3Co1/3Mn1/3O2 is considered to deserve a bright application future due to the excellent performance. TiO2 film was coated on the surface of LiNi1/3Co1/3Mn1/3O2 by soaking in liquid in order to prevent irreversible reactions between the cathode and electrolytes. The microstructure analysis indicated that the TiO2 film was in the thickness of ~ 100 nm, the core material was identified as a hexagonal lattice. The experiment results showed that TiO2 coating was effective to improve overcharged capability and cycle stability. The capacity retention of the coated LiNi1/3Co1/3Mn1/3O2 was increased by 10 % compared with blank sample in 50 cycles at the cutoff voltage of 3.0-4.5V at 0.1C rate.
Keywords: lithium ion battery surface coating cathode materials
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