化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (6) : 118-121.

新材料与新技术

石墨烯包覆钴铝酸锂的制备及其在高电压下电化学性能的研究

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Preparation of graphene-coated LiAl_0.15Co_0.85O₂ and its electrochemical property at high voltage

Chen Junhui, Chen Junqing, Bei Fengli

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Received		Published
2019-01-02		2020-06-20
Issue Date	Revised Date
2020-07-02	2019-01-02

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摘要

采用溶胶-凝胶法制备钴铝酸锂,用氧化石墨烯将其包覆,然后通过溶剂热法将氧化石墨烯还原,最终得到石墨烯包覆钴铝酸锂正极材料(LiAl_0.15Co_0.85O₂/GO)。通过X射线衍射(XRD)、透射电镜(TEM)、扫描电镜(SEM)和循环充放电测试了LiAl_0.15Co_0.85O₂/GO的晶体结构和电化学行为。结果表明,在电压范围为3～4.5V,0.2C倍率下,LiAl_0.15Co_0.85O₂/GO的首次放电比容量为178mAh/g,循环50次后容量保持率为93.6%。

Abstract

Cobalt lithium aluminate (LiAl_0.15Co_0.85O₂) obtained by sol-gel method was coated with graphene.Graphene was reduced by solvothermal method,and finally,grapheme-coated lithium cobalt aluminate anode material (LiAl_0.15Co_0.85O₂/GO) was obtained.Both the crystal structure and electrochemical behavior of LiAl_0.15Co_0.85O₂/GO were studied by X-ray diffraction (XRD),transmission electron microscopy (TEM),scanning electron microscopy (SEM) and cyclic charge-discharge.The results shown that the first discharge specific capacity of LiAl_0.15Co_0.85O₂/GO was 178mAh/g at a voltage range of 3～4.5V and a rate of 0.2C,and the capacity retention rate was 93.6% after 50 cycles.

关键词

锂离子电池 / 钴铝酸锂 / 石墨烯 / 高电压

Key words

lithium ion battery / lithium cobalt aluminate / graphene / high voltage

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石墨烯包覆钴铝酸锂的制备及其在高电压下电化学性能的研究[J]. 化工新型材料, 2020, 48(6): 118-121 DOI:

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