化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (3) : 67-70. DOI:

新材料与新技术

高容量富锂三元材料xLi₂MnO₃·(1-x)LiNi_0.6Co_0.2Mn_0.2O₂的制备与性能研究

^1,2*

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Preparation and property of high capacity Li-rich anode material xLi₂MnO₃·(1-x)LiNi_0.6Co_0.2Mn_0.2O₂

Wang Liyuan¹,Li Jiangang^1,2,Yao Qiong²,He Xiangming³,Liu Cai²

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摘要

以氢氧化物共沉淀法制备前驱体,碳酸锂(Li₂CO₃)为锂盐,高温烧结合成富锂正极材料锂镍钴锰复合材料[xLi₂MnO₃·(1-x)LiNi_0.6Co_0.2Mn_0.2O₂(x=0.1,0.2,0.3,0.4,0.5)]。结构分析显示,所制材料都是由小晶粒团聚烧结形成的不规则二次颗粒组成,呈现典型的α-NaFeO₂结构。电性能研究表明,随着x值的增大,所制材料的层状结构趋于完善,且在高电压深度充电下的结构稳定性增加,电荷传递阻抗显著减小,电性能逐渐改善。Li_1.167Ni_0.433Mn_0.3Co_0.1O₂(x=0.5)表现出了较小的电极极化和较快的电极-界面反应,电性能最佳,其0.1C初始放电容量达251.5mAh/g,在0.2C倍率条件下循环30次后容量保持率达86.9%。

Abstract

Li-rich anode material xLi₂MnO₃·(1-x)LiNi_0.6Co_0.2Mn_0.2O₂(x=0.1,0.2,0.3,0.4,0.5) were synthesized by annealing the mixture of hydroxide precursors with Li₂CO₃.Structure analysis revealed that as-prepared materials presented irregular secondary particles morphology and typical α-NaFeO₂ layered phase structure.Electrochemical properties analysis showed that increasing Li₂MnO₃ content value x leaded to improved layered structure,increased the structural stability at high charge voltage and deep charge state,decreased electron transfer resistant,and thus improved electrochemical performance.Li_1.167Ni_0.433Mn_0.3Co_0.1O₂(x=0.5)with the lowest electron transfer resistant exhibited the best charge-discharge properties.Its initial discharge capacity at 0.1C reached 251.5mAh/g,and the capacity retention remained 86.9% at 0.2C after rate capability test for 30 cycles.

关键词

锂离子电池 / 富锂材料 / 共沉淀法 / 电化学性能

Key words

lithium-ion battery / Li-rich material / coprecipitation / electrochemical property

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高容量富锂三元材料xLi₂MnO₃·(1-x)LiNi_0.6Co_0.2Mn_0.2O₂的制备与性能研究[J]. 化工新型材料, 2019, 47(3): 67-70 DOI:

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