(中南大學 冶金科學與工程學院，長沙 410083)
摘 要: 以LiOH•H2O、Ni(OH)2和Mn3O4為原料，采用固相法合成鋰離子電池正極材料Li[Li0.2Ni0.2Mn0.6]O2。通過X射線衍射(XRD)、掃描電子顯微鏡(SEM)對所得樣品的結(jié)構和形貌進行表征，并測試了該材料的倍率性能和高低溫性能。結(jié)果表明：900 ℃下燒結(jié)10 h 后可獲得晶粒細小均勻的層狀Li[Li0.2Ni0.2Mn0.6]O2材料，并具有良好的電化學性能，放電容量最高可達235.9 mA∙h/g；在50 ℃下測試時該材料的放電容量高達284.4 mA∙h/g，并表現(xiàn)出良好的循環(huán)性能，其倍率性能和低溫性能還有待進一步改善。
關鍵字: 鋰離子電池；正極材料；固相法；電化學性能
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Li[Li0.2Ni0.2Mn0.6]O2 was synthesized by solid state method using LiOH•H2O, Ni(OH)2 and Mn3O4 as starting materials. The structure and morphologies of products were characterized by XRD and SEM. The electrochemical performances were also investigated at different rates and temperatures. It is found that the sandwich Li[Li0.2Ni0.2Mn0.6]O2 material obtained at 900 ℃ for 10 h exhibits uniform and fine particle sizes, indicating high electrochemical capacity and good cycling stability. The maximum discharge capacity is 235.9 mA∙h/g. The discharge capacity can reach as high as 284.4 mA∙h/g at 50℃, and an excellent cyclability is also obtained, while the performance deteriorated at low temperature and the rate capability needs to be improved.
Key words: lithium-ion battery; cathode material; solid state method; electrochemical performance
