摘要
采用高温固相法合成了硼掺杂LiNi_(0.825)Co_(0.115)Mn_(0.06)O_(2)高镍正极材料,并研究了硼掺杂量对LiNi_(0.825)Co_(0.115)Mn_(0.06)O_(2)正极材料微观形貌结构、电化学性能的影响。结果表明,经过硼掺杂后,材料的一次颗粒形貌由原来的类椭球状变为成径向排列的放射状,并且随硼掺杂量增加改变更加明显;电化学性能测试发现,适量硼掺杂能够有效提高材料的循环性能;1%硼掺杂的材料在2.7~4.3 V电压区间、2C倍率下充放电循环300圈后,容量保持率仍有91.46%,比未掺杂样品的容量保持率高5个百分点。
Ni-rich LiNi_(0.825)Co_(0.115)Mn_(0.06)O_(2) cathode material was synthesized by high-temperature solid-state method.The effect of boron doping amount on the microstructure and electrochemical properties of Ni-rich LiNi_(0.825)Co_(0.115)-Mn_(0.06)O_(2) cathode materials were investigated.It is found that the primary particle morphology of the Ni-rich cathode material changes from being approximate ellipsoid to being a radial arrangement after boron doping,which become more obvious by increasing the amount of boron doping.Electrochemical tests indicate that appropriate amount of boron doping can effectively improve the cyclic performance of Ni-rich cathode material.With the doping amount of 1%,the boron-doped material exhibits high capacity retention of 91.46%at 2.7~4.3 V after 300 cycles at 2 C rate,which is 5 percentage points higher compared with the capacity retention of the sample without doping.
作者
陈嘉鑫
李灵均
谭磊
CHEN Jia-xin;LI Ling-jun;TAN Lei(School of Materials Science and Engineering,Changsha University of Science and Technology,Changsha 410114,Hunan,China)
出处
《矿冶工程》
CAS
CSCD
北大核心
2021年第4期141-145,共5页
Mining and Metallurgical Engineering
基金
国家自然科学基金(51774051)
湖南省湖湘青年英才(2019RS2034)
湖南省自然科学基金(2018JJ2428)
湖南省高新技术产业科技创新先导计划(2020GK2072)
湖南省教育厅科研基金(17B002)。
关键词
锂离子电池
硼掺杂
高镍正极材料
微观形貌
电化学性能
lithium-ion battery
boron doping
Ni-rich cathode material
microstructure
electrochemical performance
