锂离子正极材料Li(Ni1/3Co1/3Mn1/3)0.95Al0.05O2的制备及电化学性能

doi:10.3724/SP.J.1095.2014.30270

摘要/Abstract

摘要： 以化学法合成Li(Ni1/3Co1/3Mn1/3)1-xAlxO2系列正极材料(0≤x≤0.1)；用X射线衍射仪、扫描电子显微镜和充放电仪研究系列产物的晶体微观结构、表面形貌以及电化学性能，研究不同Al含量参杂对材料性能的影响。结果表明,合成的材料均属于六方晶系，R3m空间群，保持α-NaFeO2层状结构相；Li(Ni1/3Co1/3Mn1/3)0.95Al0.05O2的首次放电容量166.30 mA·h/g,在2.5～4.5 V区间60次循环后比容量衰竭率为4.43%。通过对比Li(Ni1/3Co1/3Mn1/3)0.95Al0.05O2和Li(Ni1/3Co1/3Mn1/3)O2 的电极阻抗,分析它们的电化学循环机理，可知掺杂Al后的正极材料适合大倍率放电。

关键词: 锂离子电池, 正极材料, Li(Ni1/3Co1/3Mn1/3)0.95Al0.05O2, 电化学性能

Abstract: A series of cathode materials Li(Ni1/3Co1/3Mn1/3)1-xAlxO2(0≤x≤0.1) was synthesized by chemical method. The microstructure, surface morphology and electrochemical performance of products synthesized were characterized by X-ray diffraction, scanning electron microscopy and electrochemical techniques. The influence of different mixed Al content on the properties of ceramic materials was studied. The results indicat that the as-prepared Li(Ni1/3Co1/3Mn1/3)1-xAlxO2 has a hexagonal α-NaFeO2 structure with a space group of R3m and hexagonal system. Initial discharge capacity of Li(Ni1/3Co1/3Mn1/3)0.95Al0.05O2 is 166.30 mA·h/g in the voltage window of 2.5～4.5 V and shows only 4.43% reduction after 60 cycles. AC impedance method was adopted to study the electrochemical circulation mechanism of Li(Ni1/3Co1/3Mn1/3)O2 and Li(Ni1/3Co1/3Mn1/3)0.95Al0.05O2, and Al-coped cathode material is suitable for high rate discharging.

Key words: lithium-ion battery, cathode materials, Li(Ni1/3Co1/3Mn1/3)0.95Al0.05O2, electrochemical-performance

中图分类号:

O646
TM911

刘建本, 莫如宝, 吴显明. 锂离子正极材料Li(Ni_1/3Co_1/3Mn_1/3)_0.95Al_0.05O₂的制备及电化学性能[J]. 应用化学, DOI: 10.3724/SP.J.1095.2014.30270.

LIU Jianben1*, MO Rubao2, WU Xianming1. Preparation and Electrochemical Performances of Li(Ni_1/3Co_1/3Mn_1/3)_0.95Al_0.05O₂ Cathode Material for Lithium-ion Batteries[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.30270.

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锂离子正极材料Li(Ni_1/3Co_1/3Mn_1/3)_0.95Al_0.05O₂的制备及电化学性能

Preparation and Electrochemical Performances of Li(Ni_1/3Co_1/3Mn_1/3)_0.95Al_0.05O₂ Cathode Material for Lithium-ion Batteries

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