Synthesis of Cr-doped LiMnPO4/C cathode materials by sol–gel combined ball milling method and its electrochemical properties
Synthesis of Cr-doped LiMnPO4/C cathode materials by sol–gel combined ball milling method and its electrochemical properties
复制标题
DOI：
10.1007/s11581-013-0919-9
复制
发表时间：
2013-05
期刊：
影响因子：
2.8
通讯作者：
Ling Wu;Shengkui Zhong;Jiajia Lu;Jie-qun Liu;Fan Lv
中科院分区：
文献类型：
--
作者：
Ling Wu;Shengkui Zhong;Jiajia Lu;Jie-qun Liu;Fan Lv
采用溶胶-凝胶结合球磨法合成了LiMn 1-xCrxPO 4/C（x= 0，0.01，0.03和0.05）化合物。研究了Cr掺杂对LiMnPO 4结构、形貌和电化学性能的影响。XRD分析结果表明，所有样品均为单一的LiMnPO 4相，Cr离子在Mn位（x≤ 0. 03）取代，Li位空位得到电荷补偿。空位的存在有利于提高LiMnPO 4的电子电导率。SEM研究表明，Cr掺杂能有效抑制LiMnPO 4颗粒的团聚。电化学测试结果表明，掺铬样品比未掺杂样品具有更高的初始容量和更好的循环性能。LiMn0.97Cr0.03PO4/C的电化学性能最好，在0.1 C倍率下首次放电比容量为132.4 mAh g− 1，循环30次后容量保持率为94.8%。
LiMn1-xCrxPO4/C (x= 0, 0.01, 0.03, and 0.05) compounds are synthesized by a sol–gel combined ball milling method. The effects of Cr doping on the structure, morphology, and electrochemical performance of LiMnPO4are investigated. XRD analysis results indicate that all the samples exhibit the single LiMnPO4phase and Cr ions substitute on Mn site (x≤ 0.03), with charge compensating vacancies on Li site. The vacancies are of benefit to improving the electronic conductivity of LiMnPO4. SEM studies reveal that Cr doping can effectively inhibit the aggregation of LiMnPO4particles. Electrochemical tests show that the Cr-doped samples exhibit higher initial capacities and better cycling performance than the undoped one. LiMn0.97Cr0.03PO4/C exhibit the best electrochemical performance that the first specific discharge capacity is 132.4 mAh g−1at 0.1 C rate, and the capacity retention is 94.8 % after 30 cycles.