摘要
以乳酸锂兼做锂源和碳源,通过高温固相反应制备锂离子电池Li_(3)V_(2)(PO_(4))_(3)/C复合正极材料。研究一次球磨混合原料和原料预分解后的二次球磨处理对复合材料晶体结构、颗粒尺寸、颗粒分散性和电化学性能的影响。结果表明,相比一次球磨,经过二次球磨处理制备的Li_(3)V_(2)(PO_(4))_(3)/C复合材料具有更小的颗粒尺寸和更高的颗粒分散性,并表现出更优异的电化学性能。在3.0~4.3V电压范围,10C倍率下的放电比容量为115mAh·g^(-1),在1C倍率下循环200次容量保持率达到97%;在3.0~4.8V电压范围,5C倍率下循环200次容量保持率为93%,表现出优异的倍率性能和循环稳定性。
Li_(3)V_(2)(PO_(4))_(3)/Ccathode materials were prepared by a solid-phase reaction using lithium lactate as the lithium and carbon sources.The raw materials were mixed by primary ball milling and further ball milling after precalcining,respectively.The effect of ball milling method on the crystal structure,particle size,particle dispersity,and electrochemical performance of the composite was investigated.The results indicate that the Li_(3)V_(2)(PO_(4))_(3)/C composite prepared via secondary ball milling has smaller particle size,higher dispersity,and superior electrochemical performance than that prepared by primary ball milling.The composite presents a specific discharge capacity of 115 mAh·g^(-1)at 10 C and a capacity retention of 97%at 1 C after 200 cycles in the voltage range of 3.0~4.3 V.Moreover,the capacity retention of 93%at 5 C after 200 cycles can also be achieved in the voltage range of 3.0~4.8 V,illustrating outstanding rate capability and cycling stability.
作者
汪燕鸣
刘晓玉
王飞
Wang Yanming;Liu Xiaoyu;Wang Fei(Huaibei Normal University,Huaibei 235000,China)
出处
《廊坊师范学院学报（自然科学版）》
2021年第1期35-39,共5页
Journal of Langfang Normal University(Natural Science Edition)
基金
安徽高校自然科学研究项目(KJ2018ZD058)
安徽省自然科学基金项目(2008085MB34)。
