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研究论文

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 ,
  • 陈炼 ,
  • 翟玉春
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  • 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

  网络出版日期: 2010-05-28

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

  • LIU Li-ying ,
  • ZHANG Hai-yan ,
  • CHEN Lian
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  • ( 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 date: 2010-05-28

  Revised date: 2010-05-28

  Online published: 2010-05-28

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.

本文引用格式

刘丽英 , 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, 2010 , 16(2) : 216 -221 . DOI: 10.61558/2993-074X.3347

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.
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