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 |
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引用本文: | 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,2010,16(2):216. |
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作者姓名: | 刘丽英 张海燕 陈炼 翟玉春 |
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作者单位: | 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; |
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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.
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关 键 词: | 磷酸钒锂 正极材料 锂离子电池 球磨 电化学性能 |
收稿时间: | 2010-05-28 |
Synthesis and Electrochemical Properties of Li_3V_2(PO_4)_3/C Cathode Materials for Lithium Ion Battery |
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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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Keywords: | Li3V2( PO4) 3 cathode material Li-ion batteries ball milling electrochemical performance |
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