固相法合成大颗粒尖晶石锰酸锂正极材料

Synthesizing cathode material large-particle spinel lithium manganate by solid-state method

采用固相法一次合成尖晶石锰酸锂（LiMn2O4），研究了掺杂V及合成时间对材料的影响；用感应耦合等离子体（ICP）、XRD、SEM、激光粒度分析（LPS）、BET和充放电测试，对材料进行分析。相对于未掺杂的材料，在850℃下保温12h合成的掺杂V的LiMn2O4具有更完整的结晶度、光滑的颗粒表面，粒径增至16．76μm，比表面积减至0．258m^2／g；以0．5C在3．0-4．3V充放电，25℃和55℃时循环30次的容量保持率分别提高了2．86％和4．13％。

Spinel lithium manganate（LiMn2O4） was synthesized by one-step solid-state method. The effects of sintering time and V doping on the performance of materials were studied. The materials were analyzed by inductively coupled plasma（ICP）, XRD, SEM,laser particle size analysis（LPS）, BET and charge-discharge tests. Relative to the undoped materials, the V doped LiMn204 sintered at 850 ℃ for 12 h had more integrated crystallization and smooth particle surface with the increase of particle size （16.76 μm） and the reduction of specific surface（0.258 m2/g）. When charged-discharged in 3.0 -, 4.3 V with 0.5 C, the capacity retention ratio after 30 cycles was improved 2.86% and 4.13% at 25 ℃ and 55 ℃ ,respectively.