四氧化三钴作为锂离子电池负极材料

本文以硝酸钴、硝酸银和葡萄糖作为原料，乙二醇作为分散剂，用水热法成功的得到了含银量不同的黑色Co3O4样品。用SEM、XRD和恒电流充放电系统对材料的结构、形貌及其电化学性能进行表征。结果表明：所得样品为线状纳米结构，当含3 wt%Ag 时Co3O4样品具有较好的电化学性能，在100 mA/g的电流密度下，首次放电比容量为1315 mA h/g，经过30个循环后比容量为796 mA h/g，容量保持率为60.5%。

关键词：四氧化三钴；负极材料 ；水热法

Cobalt Oxide as the Anode Material for Lithium-ion Battery

Abstract: Co3O4 with different content of silver was synthesized by hydrothermal with Co(NO3)2,AgNO3 and Glucose as raw materials, ethylene glycol as dispersant. The structure, morphology and electrochemical properties of the materials were characterized by SEM, XRD and charge and discharge. The results showed that the samples are nano-structure, have good electrochemical performance when containing 3 wt% Ag -Co3O4. At the current density of 100 mA/g, the first discharge specific capacity is 1315 mA h/g, after 30 cycles, the capacity is 796 mA h/g, the capacity retention rate was 60.5%.

Key words: Cobalt oxide; Anode; Hydrothermal
目录
 
摘要 1
Abstract 1
1.绪论 2
1.1引言 2
1.2锂离子电池概述 2
1.3锂离子电池的组成及工作原理 3
1.4锂离子电池电极材料概述 4
1.4.1正极材料 4
1.4.2负极材料 5
1.5 Co3O4的性质与储锂性能 6
1.6本课题的选题意义 6
2.实验 7
2.1试剂 7
2.2仪器 7
2.3样品的制备 7
2.4材料表征以及电池的制备和性能测试 8
2.4.1样品表征 8
2.4.2电池的组装和电化学性能测试 8
3.结果和讨论 8
3.1 Co3O4样品XRD表征 8
3.2 SEM表征 9
3.3样品电化学性能测试 11
3.3.1恒流充放电结果 11
3.3.2循环伏安CV曲线分析 12
3.3.3交流阻抗AC曲线分析 13
4.结论 13
展望 13
参考文献 14
 

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