Li3V2(PO4)3溶胶-凝胶-微波合成工艺优化及性能研究
Optimization and Performance Study of Li3V2(PO4)3 Synthesized by Sol-gel-microwave Method
张 勇, 吕 艳, 王力臻, 张爱勤
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作者单位:(郑州轻工业学院 河南省表界面科学重点实验室, 河南 郑州 450002)
中文关键字:Li3V2(PO4)3; 锂离子电池; 正交试验; 溶胶-凝胶-微波法
英文关键字:Li3V2(PO4)3; lithium ion batteries; orthogonal experiment; sol-gel-microwave method
中文摘要:用溶胶-凝胶-微波法制备了锂离子电池正极材料Li3V2(PO4)3样品,用正交试验法考察了影响样品性能的因素,分析并优化了工艺。XRD、SEM和电化学测试表明:该方法所制备的样品为单斜结构,粒径尺寸0.2~1 μm,颗粒分布比较均匀。锂源为Li2CO3、反应物摩尔比为Li ∶ V=3.0 ∶ 2.0、微波时间为25 min时,为最佳合成工艺条件。在此优化条件下,3.0~4.3 V区间内0.2 C放电比容量达到106 mAh/g,交换电流密度高达6.17 × 10-6 A/cm2。
英文摘要:Li3V2(PO4)3 cathode materials for lithium ion batteries were synthesized by sol-gel-microwave method. The influencing factors on the properties of the samples were discussed and the technology parameters were optimized using orthogonal experiment method. XRD, SEM and electrochemical test show that the material has a single monoclinic structure and grain size is from 0.2 μm to 1 μm and in uniform distribution. The optimal condition is that lithium source is Li2CO3, the ratio of reactant Li ∶ V is 3.0 ∶ 2.0 and microwave time is 25 min. Under the conditions, the product has excellent electrochemical performance, the initial specific discharge capacity is 106 mAh/g, when 0.2C charge-discharge is 3.0~4.3 V. The exchange current density is determined as 6.17 × 10-6 A/cm2 by Tafel curve.