Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第3期    总第228期    2018年3月

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文章编号:1004-0609(2018)-03-0565-07
锂离子电池正极材料LiMnBO3/C的合成及其电化学性能
陈 伟1,张 华3,张晓萍2,刘洁群2,刘士军1,钟胜奎2

(1. 中南大学 化学化工学院, 长沙 410083; 2. 苏州大学 钢铁学院, 苏州 215021; 3. 上海杉杉科技有限公司, 上海 201209)

摘 要: 以LiOH·H2O、Mn(CH3COO)2·4H2O和H3BO3为原料,聚乙二醇6000(PEG-6000)为碳源,采用喷雾干燥法合成LiMnBO3和LiMnBO3/C正极材料。XRD测试表明,两种样品均为单一的六方晶体结构LiMnBO3(h-LiMnBO3);电化学测试表明,在电压范围1.0~4.8 V内,LiMnBO3在0.5C倍率下的首次放电比容量为63.28 mA?h/g,而LiMnBO3/C的首次放电比容量高达135.21 mA?h/g;循环50次后,两者比容量分别为31.15 mA?h/g和109.69 mA?h/g。碳源的加入有效地提升了LiMnBO3的电化学性能。

 

关键字: 正极材料;硼酸锰锂;喷雾干燥;碳包覆

Synthesis and electrochemical properties of LiMnBO3/C as cathode material for Li-ion batteries
CHEN Wei1, ZHANG Hua3, ZHANG Xiao-ping2, LIU Jie-qun2, LIU Shi-jun1, ZHONG Sheng-kui2

1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; 2. School of Iron and Steel, Soochow University, Suzhou 215021, China; 3. Shanghai Shanshan Technology Co., Ltd., Shanghai 201209, China

Abstract:LiMnBO3 and its carbon coated material LiMnBO3/C were synthesized via spray-drying method using LiOH·H2O, Mn(CH3COO)2·4H2O and H3BO3, as starting materials and polyethylene glycol 6000 (PEG-6000) as carbon resource. XRD results indicate that the samples have hexagonal crystal structure (h-LiMnBO3). The electrochemical tests show that the LiMnBO3/C particles delivers a high first discharge capacity of 135.21 mA?h/g at 0.5C rate within 1.0-4.80 V and retaining a discharge capacity of 109.69 mA?h/g after 50 cycles, while the LiMnBO3 composite displays a first discharge capacity of 63.28 mA?h/g and a capacity remaining of 31.15 mA?h/g after 50 cycles. The carbon-coated LiMnBO3 could effectively improve the electrochemical performance.

 

Key words: cathode material; LiMnBO3; spray-drying; carbon-coated

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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