煅烧温度对Li[Li_(0.2)Ni_(0.15)Mn_(0.55)Co_(0.1)]O_2的影响

Effects of calcination temperature on Li[Li_(0.2)Ni_(0.15)Mn_(0.55)Co_(0.1)]O_2

用溶胶-凝胶法合成锂离子电池用富锂正极材料Li[Li0.2Ni0.15Mn0.55Co0.1]O2,通过XRD、SEM、电感耦合等离子体发射光谱（ICP-OES）和电化学性能测试考察煅烧温度对合成材料结构和性能的影响。900℃下制备的材料具有典型的α-Na Fe O2层状结构、较好的晶型结构及良好的电化学性能。在2.04.8 V充放电,20℃下的0.10 C首次放电比容量为235.4 m Ah/g,库仑效率为78.5%;依次以0.10 C、0.20 C、0.50 C、0.75 C和1.00 C循环10次,再以0.20 C放电,首次1.00 C放电比容量为149.7 m Ah/g,最后一次0.20 C放电比容量为首次0.10 C放电比容量的85.9%。

Lithium-rich cathode material Li[Li0. 2Ni0. 15Mn0. 55Co0. 1]O2 for Li-ion battery was synthesized via sol-gel method, effects of calcination temperature on structure and performance of prepared material were studied by XRD, SEM, inductive coupled plasma optical emission spectrometer（ICP-OES） and electrochemical performance tests. The material which prepared under 900℃ had a typical α-NaFeO2 layered structure,better crystal structure and fine electrochemical performance. When charged-discharged in 2. 0 -4. 8 V,its 0. 10 C initial specific discharge capacity was 235.4 mAh/g at 20℃ ,the coulomb efficiency was 78. 5%. When cycled in the order of 0. 10 C,0. 20 C,0. 50 C,0. 75 C and 1.00 C for 10 times respectively,then discharged with 0. 20 C,the initial 1.00 C specific discharge capacity was 149. 7 mAh/g,the 0. 20 C specific discharge capacity in the latest cycle was 85.9% compared with the initial 0. 10 C discharged one.