摘要
本研究以硝酸锰、硝酸镍、硝酸钴、聚乙烯吡咯烷酮(PVP)和碳酸钠为原料,通过化学共沉淀法结合微波化学快速水热合成法制备了富锂锰基正极材料Li1.2Mn0.58Ni0.18Co0.04O2。对正极材料进行了包括电化学性能表征等测试其结构和形貌表征,研究结果表明采用此方法制备的富锂锰基层状复合氧化物正极材料Li1.2Mn0.58Ni0.18Co0.04O2为空心结构,产物结晶性良好,粒径分布均匀,形貌规则,电化学活性高。在20mA/g下首次放电比容量为275.8mAh/g,在200mA/g下放电比容量为210mAh/g,40mA/g循环100次容量保持率高达91.8%。
In this work,with the raw materials of Mn(NO3)4·4H2O,Ni(NO3)2·6H2O,Co(NO3)3·6 H2O,PVP and Na2CO3,a facile co-precipitation approach combined with microwave assisted hydrothermal technique has been developed for a large scale synthesis of Lithium-rich layered oxide,hollow Li1.2Mn0.58Ni0.18CO0.04O2 microspheres.The crystal structure and morphology of the prepared sample were characterized conventionally.The hollow miscro-spheres are formed with Li1.2Mn0.58Ni0.18CO0.04O2 nanosheets and nanocrystals.Charge/discharge tests indicate that the prepared sample exhibits a highly reversible capacity(275.8 mAh/g at 20 mA/g),excellent rate capability(210 mAh/g at 200 mA/g)and best cycling performance(capacity retention of 91.8%after 100 cycles at 40 mA/g),which can be attributed to the appropriate pore size and unique nanocrystal-assembled hollow microstructures.
作者
李艳萍
闫东伟
周少雄
况春江
LI Yanping;YAN Dongwei;ZHOU Shaoxiong;KUANG Chunjiang(China Iron&Steel Research Institute Group,Beijing 100081,China;Research and Development Center,Advance Technology&Materials Co.,Ltd,Beijing 100081,China)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2019年第6期884-888,927,共6页
Journal of Materials Science and Engineering
基金
国家“863”资助项目(2015AA034601)
安泰科技股份有限公司技术创新资助项目(2013JA02PYF)
