草酸盐共沉淀法制备Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_(2-x)F_x正极材料及电化学性能

Preparation and electrochemical performance of Li(Ni_(1/3)Co_(1/3)Mn_(1/3))O_(2-x)F_x anode material with oxalate co-precipitation method for lithium ion batteries

采用草酸盐共沉淀法合成了锂离子电池用Li(Ni1/3Co1/3Mn1/3)O2-xFx(x=0,0.03,0.05,0.1)粉末材料,考察了掺杂氟对Li(Ni1/3Co1/3Mn1/3)O2结构与性能的影响。采用XRD、SEM和电池充放电循环测试方法等表征了Li(Ni1/3Co1/3Mn1/3)O2-xFx材料的结构与性能。结构表明,950℃焙烧10h制备的Li(Ni1/3Co1/3Mn1/3)O1.97F0.03材料具有较好的层状结构与综合电化学性能,阳离子混合度小、六角晶格有序性高,颗粒的平均粒径为2～3μm。I003/I104为1.29,R值为0.42,首次放电容量为141.7mA·h/g(2.8～4.2V,0.2C倍率),首次充放电容量效率为82.4%,0.2C倍率循环30次后的放电容量为首次放电容量的95.6%。

The layered Li（Ni1/3Co1/3Mn1/3）O2-xFx（x=0,0. 03,0. 05,0. 1） anode material for lithium ion batteries was synthesized by oxalate co-precipitation method. The structure and electrochemical properties of Li（Ni1/3Co1/3Mn1/3）O2-xFx were characterized by X-ray diffractometry, scanning electron microscopy and galvanostatic charge-dischargecycling. The results showed that Li（Ni1/3Co1/3Mn1/3）O1.97F0.03 powder sample synthesized at 950℃ for 10h revealed good intergration electrochemical properties and well-ordered hexagonal layered structure with low cation mixing. The value of I003/I104 was 1.29. The value of R was 0. 42. The particles with 2-3 μm size can be identified from SEM observations. The initial dis- charge capacity of the Li（Ni1/3Co1/3Mn1/3）O1.97F0.03 anode was 141.7mA·h/g in the voltage range of 2.8-4. 2V at 25℃ and the discharge capacity maintained 95.6% of the initial discharge capacity after 30 charge-discharge cycles at 0.2C.