摘要
采用溶胶-凝胶法合成层状正极材料Li[Li0.2Mn0.54Ni0.13Co0.13-xAlx]O2(x=0,0.05,0.13)。用X射线衍射(XRD)、循环伏安(CV)和充放电测试等手段对产物的结构及电化学性能进行了表征。结果表明:采用溶胶-凝胶法在900℃空气氛围下煅烧12h制备的Li[Li0.2Mn0.54Ni0.13Co0.08Al0.05]O2晶型较好,具有α-NaFeO2型层状结构。室温,2.0～4.8V下,0.1C倍率下最高放电比容量达到268.3mAh/g,0.2C倍率下循环50次后比容量依然高达238.1mAh/g,具有良好的电化学性能。
The Li[Li0.2Mn0.54Ni0.13Co0.13-xAlx]O2 （x=0,0. 05,0. 13）anode materials were synthesized by sol-gel method. The materials were characterized by X-ray diffraction（XRD）, cyclic voltammetry（CV）and charge-discharge test. The results indicated that the Li[Li0.2Mn0.54Ni0.13Co0.13-xAlx]O2 powder with better crystalline structure and layed a- NaFeOs structure could be obtained at calcining temperature 900℃ for 12 h under air atmosphere. The charging-discharging tests showed that at room temperature between 2. 0-4. 8 V, the highest discharge capacity of Li[Li0.2Mn0.54Ni0.13Co0.13-xAlx]O2 at 0. 1C rate was 268. 3mAh/g ,and after the 50th cycle at 0. 2 C remained 238. lmAh/g ,so which had excellent cycle performance.
出处
《化工新型材料》
CAS
CSCD
北大核心
2013年第3期101-103,107,共4页
New Chemical Materials
