正极材料的制备及性能
(中南大学 冶金科学与工程学院， 长沙 410083)
摘 要: 采用液相共沉淀合成锰镍钴氢氧化物前驱体， 在前驱体中掺入元素M(M=Al， Mg, Ti)， 与锂结合生成Li(Mn1/3Ni1/3Co1/3)0.98M0.02O2材料，结果表明掺杂可有效提高材料的循环性能。 X射线衍射结果表明: 随掺钛量增大（0≤y≤0.15），晶格畸变增大, 半高宽变大， 晶粒粒径增大; 其中掺钛量y=0.1的材料电化学性能表现最好， 以20 mA/g电流充放电， 在2.5~4.6 V电压区首次放电容量可达215 mA·h/g。
关键字: Li(Mn1/3Ni1/3Co1/3)0.9Ti0.1O2; 锂离子电池; 掺杂; 电化学性能
Li(Mn1/3Ni1/3Co1/3)1-yMyO2 (M=Al, Mg, Ti)
（School of Metallurgical Science and Engineering,Central South University, Changsha 410083, China）
Abstract: Cathode materials of Li(Mn1/3Ni1/3Co1/3)0.98M0.02O2(M=Al, Mg, Ti) were synthesized through mixing lithium carbonate with precursor—nickel cobalt manganese hydroxide complex prepared by liquid co-precipitation technique, then doping Al, Mg and Ti. The result shows that the dopant can improve the cycling behavior of materials. As the result of X-ray diffraction studies, the degree of crystal lattice disfigurement grows which reflects the full width half maximum(FWHM) increases, and the grain size goes up with increasing amount of doping Ti. Li(Mn1/3Ni1/3Co1/3)0.9Ti0.1O2 was confirmed as having the optimum electrochemical performance, whose first discharge capacity can reach 215 mA·h/g at current rate of 20 mA/g in voltage range from 2.5 to 4.6 V.
Key words: Li(Mn1/3Ni1/3Co1/3)0.9Ti0.1O2; Li-ion battery; doping; electrochemical performance
