正极材料Li_3V_2(PO_4)_3改性制备及其低温性能研究

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英文篇名：Preparation and low temperature electrochemical performance of Li_3V_2(PO_4)_3 cathode 作者：谢坤池 英文作者：XIE Kun-chi;High School Attached to Northeast Normal University; 关键词：磷酸钒锂 ; 低温性能 ; 正极材料 ; 锂离子电池 英文关键词：Li3V2(PO4)3;;low temperature electrochemical performance;;cathode;;lithium-ion battery 中文刊名：FZKB 英文刊名：Journal of Molecular Science 机构：东北师范大学附属中学高中部; 出版日期：2019-04-15 出版单位：分子科学学报 年：2019 期：v.35;No.166 基金：国家自然科学基金资助项目(201805030) 语种：中文; 页：FZKB201902006 页数：7 CN：02 ISSN：22-1262/O4 分类号：43-49

摘要

采用Li_2CO_3,NH_4VO_3,NH_4H_2PO_4,葡萄糖和高导电碳(Super P)作为原料,利用碳热还原法制备了双碳包覆的磷酸钒锂,考察了反应温度对材料电化学性能的影响;采用XRD,SEM,TEM和恒流充放电测试等手段对产物的结构、形貌和电化学性能进行了研究.结果表明,在800℃制备的磷酸钒锂具有最佳的电化学性能,在0.2C倍率下放电比容量为126mAh/g,1C倍率下循环200次之后,容量依然保持在97%以上.以该材料为正极材料组装的成品10～20Ah铝壳电池具有优异的低温性能和大倍率循环性能.在-40℃下放电容量能够达到常温容量的93%以上,以10C倍率进行室温充放电循环2 000次后容量仍保持在98%.
        Dual carbon-coated Li_3V_2(PO_4)_3 was prepared by carbon-thermal reduction using Li_2CO_3,NH_4VO_3,NH_4H_2PO_4,glucose and Super P as raw materials.The effect of reaction temperature on the electrochemical properties of the material was investigated.The structure,morphology and electrochemical properties of the product were studied by XRD,SEM,TEM and constant current chargedischarge tests.The observed experimental results showed that the Li_3V_2(PO_4)_3 prepared at 800 ℃exhibits the best electrochemical performance.At 0.2 Crate,the discharge specific capacity is 126 mAh/g.Under the 1 Crate,the specific capacity can still be maintained at more than 97% after 200 cycles.More importantly,the power batteries assembled with 10～20 Ah displayed the superior low temperature electrochemical performance and high-rate cycling performance.At-40 ℃,the discharge capacity of 20 Ah power batteries is the 93% of their tested at room temperature.Moreover,the capacity retention of 10 Ah power batteries at 10 Cis still kept 98% after 2 000 cycles at room temperature.

引文

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