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在锂硫电池正极材料的研究中,碳材料可以有效改善电池倍率及循环性能。为了提高锂硫电池的高倍率放电性能,通过水热合成的方法,制备了由非均匀粒径碳球组成的碳材料。与硫热合成后,硫均匀分布在碳材料表面及周围,复合材料含硫量为52wt%。0.2C放电电流下,首次放电比容量为1 174 m Ah·g-1,100次循环后放电比容量为788 m Ah·g-1。在4C的放电电流下,放电比容量稳定维持在600 m Ah·g-1,循环过程中,库伦效率高于90%。该碳材料有良好的导电网络,且制备方便,成本低廉,对于穿梭效应和放电过程中的膨胀效应有一定的抑制作用,是一种优秀的正极材料。
In the lithium-sulfur battery cathode material research, carbon materials can effectively improve the cell rate and cycle performance. In order to improve the high-rate discharge performance of lithium-sulfur batteries, a carbon material composed of non-uniform particle size carbon spheres was prepared by hydrothermal synthesis. After sulfur synthesis, the sulfur is uniformly distributed on and around the carbon material, and the sulfur content of the composite material is 52 wt%. 0.2C discharge current, the first discharge capacity of 1 174 m Ah · g-1,100 cycles after discharge capacity of 788 m Ah · g-1. Under the discharge current of 4C, the specific discharge capacity was maintained at 600 m Ah · g-1, and the coulombic efficiency was higher than 90% during the cycle. The carbon material has a good conductive network, and has the advantages of convenient preparation and low cost, and has certain inhibitory effect on the shuttle effect and the expansion effect during discharging, and is an excellent positive electrode material.