锰酸锂包覆试验研究

Experimental Study on LiMn₂O₄ Coatin

摘要: 本试验采用高温固相法经二次煅烧结合成锰酸锂。在烧结时间、烧结温度不变的情况下，通过对振实密度(TD)、粒度分布、pH值、电化学性能进行测试，探究不同Al掺杂量对锰酸锂材料性能的影响。试验研究表明，当Al掺杂量为0.8%，二次烧结温度为700℃，烧结时间为10 h时，锰酸锂的性能达到最佳。此时，粒度D₅₀为15.50微米，振实密度达到2.03 g/cm³，在3.0~4.4 V电压范围和0.2 C倍率的条件下，电池材料的初始容量为116.46 mAh/g，50次循环容量保持率为96.13%。本论文的试验研究结果对于锰酸锂材料的改性具有一定的参考意义。

Abstract: In this test, LiMn₂O₄ was synthesized by secondary sintering using a high temperature solid phase method. Under the unchanged condition of sintering time and sintering temperature, the effects of different Al doping amount on the properties of LiMn₂O₄ materials were investigated by testing the tap density (TD), particle size distribution, pH value and electrochemical performance. Ex-perimental studies have shown that when the Al doping amount is 0.8%, the secondary sintering temperature is 700˚C, and the sintering time is 10 h, the performance of LiMn₂O₄ is optimal. At this time, the particle size D₅₀ is 15.50 μm; the tap density is 2.03 g/cm³, and the initial capacity of the battery material is 116.46 mAh/g under the conditions of 3.0 to 4.4 V and 0.2 C rate. 50 cycles ca-pacity retention is 96.13%. The experimental results of this thesis have certain reference signifi-cance for the modification of LiMn₂O₄ materials.