尖晶石型Li_(0.9)Mg_(0.05)Mn_(1.95)O_4的合成及其性能

Synthesis of spinel Li _(0.9) Mg_(0.05) Mn_(1.95) O_4 and its performance in lithiumion battery

为了提高尖晶石型LiMn2O4材料的循环性能,采用掺杂金属的高温固相合成法合成了尖晶石型Li0.9Mg0.05Mn1.95O4材料,并以该材料作正极材料,中间相炭微球(MCMB)为负极材料,组装成562247型方型锂离子蓄电池。测试结果表明,750 ℃下烧结的尖晶石型Li0.9Mg0.05Mn1.95O4循环性能最好。在室温下,1 C充放电时电池比能量为83 Wh/kg和195 Wh/L,实际电池中所制材料比容量可达85 mAh/g,循环300次后电池的可逆容量变化很小。另外,还对电池的储存性能、倍率充放电性能及高低温性能进行了研究。

In order to improve the cycle performance of spinel LiMn 2 O 4 , Li 0.9 Mg 0.05 Mn 1.95 O 4 with spinel structure had been synthe-sized by high-temperature solid-phase reaction. The performance of the prepared material was measured by 562247 prismatic battery with the prepared material as positive, MCMB as negative. The performance of Li 0.9 Mg 0.05 Mn 1.95 O 4 sintered at 750 ℃was optimal. At room temperature, specific energy of the battery charge-discharge at 1 C was 83 Wh/kg and 195 Wh/L and the ca-pacity deline was neglectable even after 300 cycles. The specific capacity of prismatic battery with the as-prepared material reached 85 mAh/g. The storage performance, charge-discharge at different current densities, high and low temperature perfor-mance were studied.