锂离子电池正极材料Li_3V_2(PO_4)_3/C的制备及电化学性能

doi:10.61558/2993-074X.3347

电化学（中英文） ›› 2010, Vol. 16 ›› Issue (2): 216-221. doi: 10.61558/2993-074X.3347

锂离子电池正极材料Li_3V_2(PO_4)_3/C的制备及电化学性能

刘丽英;张海燕;陈炼;翟玉春;

广东工业大学材料与能源学院;迈科科技有限公司;东北大学材料与冶金学院;

收稿日期:2010-05-28 修回日期:2010-05-28 出版日期:2010-05-28 发布日期:2010-05-28

Synthesis and Electrochemical Properties of Li_3V_2(PO_4)_3/C Cathode Materials for Lithium Ion Battery

LIU Li-ying1,2 ,ZHANG Hai-yan1,CHEN Lian3,ZHAI Yu-chun3

( 1. Faculty of Material and Energy,Guongdong University of Technology,Guangzhou,518006,China; 2. McNair Technology Co. Ltd,Dongguan 523800,Guangdong,China; 3. Institute of Materials & Metallurgy,Northeastern University,Shenyang,110004,China

Received:2010-05-28 Revised:2010-05-28 Published:2010-05-28 Online:2010-05-28

摘要/Abstract

摘要： 以球磨结合焙烧的方法制备锂离子电池正极材料Li3V2(PO4)3/C.XRD、EIS表征及以该材料作正极的恒电流循环测试表明,所得产物为晶体结构发育良好的单斜晶系Li3V2(PO4)3.在0.1C、0.25C和0.5C倍率下,首次放电比容量分别为150.6、134.1和107.1mAh·g-1.0.25C循环130周后容量保持率为87.3%,而0.5C循环105周后容量保持率仍达到87.2%.锂离子在材料中的嵌入、脱出伴随明显的两相转变过程.电荷传递阻抗和SEI膜阻抗是影响材料倍率性能的主要因素.

关键词: 磷酸钒锂, 正极材料, 锂离子电池, 球磨, 电化学性能

Abstract: Cathode material Li3V2( PO4) 3 /C for Lithium-ion battery was synthesized by combination of ball milling and baking. Physical and electrochemical performances of as-prepared materials were characterized through XRD,EIS and galvanostatic cell cycling. The results show that the products were monoclinic Li3 V2 ( PO4) 3 with well-developed crystal structure. At 0. 1C,0. 25C and 0. 5C,the initial discharge capacities were 150. 6,134. 1 and 107. 1 mAh·g-1 ,respectively. Capacity retention rates were 87. 3% after 130 cycles at 0. 25C and 87. 2% after 105 cycles at 0. 5C. Charge-discharge efficiencies were all above 80% and the average discharge voltage was higher. The Li + inserted / deinserted processes from Li3 V2 ( PO4 ) 3 were accompanied by clear two-phase changes. Charge-transfer resistance and SEI film impedance were main factors affecting rate properties.

Key words: Li3V2( PO4) 3, cathode material, Li-ion batteries, ball milling, electrochemical performance

中图分类号:

TM912

刘丽英, 张海燕, 陈炼, 翟玉春, . 锂离子电池正极材料Li_3V_2(PO_4)_3/C的制备及电化学性能[J]. 电化学（中英文）, 2010, 16(2): 216-221.

LIU Li-ying, , ZHANG Hai-yan, CHEN Lian, ZHAI Yu-chun . Synthesis and Electrochemical Properties of Li_3V_2(PO_4)_3/C Cathode Materials for Lithium Ion Battery[J]. Journal of Electrochemistry, 2010, 16(2): 216-221.

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锂离子电池正极材料Li_3V_2(PO_4)_3/C的制备及电化学性能

Synthesis and Electrochemical Properties of Li_3V_2(PO_4)_3/C Cathode Materials for Lithium Ion Battery

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