改性钛酸锂负极材料的合成及性能

Synthesis and performance of graphite-doping lithium titanate anode material

研究了一种改性钛酸锂负极材料的合成工艺及其性能,着重考察了烧结温度、烧结时间、石墨微粉掺杂量、原料配比(nLi∶nTi)对产物首次放电比容量和容量保持率的影响,确定了适宜的合成工艺条件。在烧结温度为950℃、烧结时间为14h、石墨微粉掺杂质量分数为5%,nLi∶nTi为0.84的条件下,钛酸锂的首次放电比容量为173.2mAh/g,与其理论值175mAh/g非常接近,100次循环后的容量保持率为92.7%;当倍率为10C时其比容量在157mAh/g左右,约为1C时比容量的94%。

The synthesis and performance of graphite-doping lithium titanate were studied. The influences of the sinter temperature, the sinter duration, the quantity of graphite and the ratio of the precursors （n u ： n n） on the initial specific discharge capacity, cycling capacity retention of the sample, and the optimum performance conditions of the synthesis were established. At the sinter temperature of 950℃, the sinter duration of 14 h, the quantity of graphite of 5% and the n u ： n n ratio of 0.84, the initial specific discharge capacity of the sample is 173.2 mAh/g, and in good agreement with the theoretical value, and the capacity retention after 100 cycles is 92.7%. When charged-discharged at rate of 10 C, the specific discharge capacity is about 157 mAh/g, which is 90% of the specific discharge capacity at rate of 1 C.