论文总字数：16835字

摘 要

近年来，层状正极材料LiNi_1/3Co_1/3Mn_1/3O₂因其工作电压高、能量密度大、充放电循环稳定以及成本低等诸多优点而备受关注，被认为是最有可能替代LiCoO₂成为主流商业化的锂离子电池正极材料。本文简述了各种锂离子电池正极材料，并介绍了LiNi_1/3Co_1/3Mn_1/3O₂正极材料的结构、优缺点以及各种制备方法和其优劣。本文主要采用溶胶-凝胶法结合静电纺丝技术制备LiNi_1/3Co_1/3Mn_1/3O₂正极材料，通过X-射线衍射测试观察样品的结构、形貌，通过电导率测试、循环伏安法测试、倍率性能测试等观察样品的电化学性能，主要研究了烧结时间对层状三元正极材料LiNi_1/3Co_1/3Mn_1/3O₂的影响。结果表明，当烧结时间为12h时，正极材料LiNi_1/3Co_1/3Mn_1/3O₂层状结构发育良好，电化学性能优秀。

关键词：锂离子电池；正极材料LiNi_1/3Co_1/3Mn_1/3O₂；烧结时间

Impact on layer structure for LiNi_1/3Co_1/3Mn_1/3O₂ ternary material by sintering time

Abstract

In recent years, layered cathode material with the formula LiNi_1/3Co_1/3Mn_1/3O₂ has attracted a lot of attention because of its high operating voltage, high energy density, stable charge-discharge performance and low cost. Furthermore, cathode material LiNi_1/3Co_1/3Mn_1/3O₂ is also considered to be the next generation of mainstream commercialized cathode material of lithium ion battery which mostly likely to replace LiCCoO₂. In this paper, many kinds of cathode material for lithium ion battery has been sketched. The structure, strengths, weaknesses and preparation method of LiNi_1/3Co_1/3Mn_1/3O₂ has also been detailed introduced.

In this paper, LiNi_1/3Co_1/3Mn_1/3O₂ cathode material has been prepared successfully by using Sol-gel method in combination with the electrospinning technique. The effect of calcination time on performances of LiNi_1/3Co_1/3Mn_1/3O₂ has been studied by using X-ray diffraction, Cyclic voltammetry method and some electrochemical tests. It turned out that LiNi_1/3Co_1/3Mn_1/3O₂ has good electrochemical properties and its layer structure is well-developed.

Key Words: lithium ion battery; LiNi_1/3Co_1/3Mn_1/3O₂ cathode material; Calcination time

目录

摘要 …………………………………………………………………………………Ⅰ

ABSTRACT……………………………………………………………………………Ⅱ

第一章 绪论…………………………………………………………………………1

1.1 前言 …………………………………………………………………………1

1.2 锂离子电池的正极材料……………………………………………………2

1.2.1氧化钴锂正极材料…………………………………………………2

1.2.2氧化镍锂正极材料…………………………………………………3

1.2.3 氧化猛锂正极材料…………………………………………………3

1.3层状三元材料LiNi_1/3Co_1/3Mn_1/3O₂……………………………………………4

1.3.1LiNi_1/3Co_1/3Mn_1/3O₂的结构……………………………………………4

1.3.1LiNi_1/3Co_1/3Mn_1/3O₂的制备方法………………………………………5

1.3.2.1 高温固相法…………………………………………………5

1.3.2.1 共沉淀法……………………………………………………6

1.3.2.3溶胶-凝胶法…………………………………………………6

1.3.2.4 喷雾干燥法…………………………………………………7

1.4 本文主要研究的主要内容和意义………………………………………7

第二章 实验方法 ……………………………………………………………………8

2.1实验试剂与仪器 ……………………………………………………………8

2.1.1 主要试剂及原材料 ………………………………………………8

2.1.2 主要仪器 …………………………………………………………8

2.2正极材料LiCo_1/3Ni_1/3Mn_1/3O₂的制备 ………………………………………9

2.3 锂离子电池的制备 ………………………………………………………10

2.3.1正极片的制备……………………………………………………10

2.3.2电池的组装………………………………………………………11

2.4 正极材料的表征与测试方法 ……………………………………………11

2.4.1 X-射线衍射法分析（XRD）………………………………………11

2.4.2 循环伏安法分析（CV） …………………………………………12

2.4.3 倍率性能测试 ……………………………………………………13

2.4.4 电导率测试 ………………………………………………………13

第三章 烧结时间对LiNi_1/3Co_1/3Mn_1/3O₂性能的影响 ………………………………14

3.1前驱体的形貌………………………………………………………………14

3.2 XRD测试分析………………………………………………………………14

3.3循环伏安法测试分析………………………………………………………16

3.4倍率性能测试分析…………………………………………………………17

3.5电导率测试分析……………………………………………………………18

3.6结论…………………………………………………………………………18

参考文献 ……………………………………………………………………………19

致谢 …………………………………………………………………………………20

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