摘要
与LiFePO_(4)材料相比,锰基橄榄石是一种具有高能量密度的锂离子电池正极材料。由于其极低的电子和离子电导率,其速率和循环性能仍然面临挑战。通过引入一种新型碳源聚丙二醇(PPG 2000)并采用固相合成法对材料进行包覆,获得了较高的倍率性能。与传统碳源葡萄糖相比,聚丙二醇(PPG 2000)可以极大提高橄榄石材料的电子电导率和离子电导率,从而改善材料的充放电特性。结果表明,LiMn_(0.6)Fe_(0.4)PO_(4)/C材料即使在10 C的速率下也能有约115 mAh/g的比容量。这项工作为固相法大规模制备锰基橄榄石正极材料开辟了新的途径。
Compared with LiFePO_(4)material,the manganese-based olivine is a cathode material for lithium ion batteries with high energy density.However,its rate and cycle performance still face challenges due to its extremely low electron and ion conductivity.In this paper,a new carbon source polypropylene glycol(PPG 2000)was used for carbon coating via the solid-phase synthesis method,with better rate performance achieved as a result.Compared with the traditional glucose carbon source,polypropylene glycol(PPG 2000)can greatly improve the electronic and ionic conductivity of olivine materials,thus improving the charge and discharge characteristics of the material.The results show that even at 10 C rate,LiMn_(0.6)Fe_(0.4)PO_(4)/C material still deliver the specific capacity up to 115 mAh/g.This work opens up a new way for large-scale preparation of manganese-based olivine cathode materials via solid-phase method.
作者
王庆祥
刘国强
黄涛
冯刚
闻雷
Wang Qingxiang;Liu Guoqiang;Huang Tao;Feng Gang;Wen Lei(School of Metallurgy,Northeastern University,Shenyang 110000,China;Shenyang Industrial Technology Research Institute of Energy Materials and Devices,Shenyang 110000,China;Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《轻金属》
北大核心
2023年第6期51-54,共4页
Light Metals
基金
国家自然科学基金资助项目(51574081)。
