Enhanced Electrochemical Performances of Ni Doped Cr_(8)O_(21)Cathode Materials for Lithium-ion Batteries  

作　　者：TANG Guoli LIU Hanxing YU Zhiyong YANG Bo KONG Linghua 

机构地区：[1]School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China [2]International School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China [3]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan 430070,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2023年第6期1242-1247,共6页武汉理工大学学报（材料科学英文版）

基　　金：National Natural Science Foundation of China(No.51790490)。

摘　　要：Cathode materials,nickel doped Cr_(8)O_(21),were synthesized by a solid-state method.The effects of Ni doping on the electrochemical performances of Cr_(8)O_(21) were investigated.The experimental results show that the discharge capacities of the samples depend on the nickel contents,which increases firstly and then decreases with increasing Ni contents.Optimized Ni_(0.5)Cr_(7.5)O_(21)delivers a first capacity up to 392.6 m Ah·g^(-1)at 0.1C.In addition,Ni doped sample also demonstrates enhanced cycling stability and rate capability compared with that of the bare Cr_(8)O_(21).At 1 C,an initial discharge capacity of 348.7 m Ah·g^(-1)was achieved for Ni_(0.5)Cr_(7.5)O_(21),much higher than 271.4 m Ah·g^(-1)of the un-doped sample,with an increase of more than 28%.Electrochemical impedance spectroscopy results confirm that Ni doping reduces the growth of interface resistance and charge transfer resistance,which is conducive to the electrochemical kinetic behaviors during charge-discharge.

关 键 词：Cr_(8)O_(21) cathode material DOPING electrochemical performances lithium-ion batteries 

分 类 号：TB34[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]