本发明公开一种水热法制备SnSe2/碳纳米管复合锂离子电池电极材料的方法，包括：称取一定量SnCl2以及SeO2；放入水热反应斧内胆中；称取碳纳米管放进内胆中；往内胆中加入去离子水，随后磁力搅拌后将内胆装进反应釜中密封；将反应釜放入干燥箱中进行水热反应；反应完成后将反应产物用去离子水和无水乙醇离心清洗若干次后干燥。本发明操作简单，不需要复杂设备，所合成的纳米级SnSe2/CNTs复合材料作为负极材料应用于锂离子电池体系中进行电化学性能测试，在电流密度为0.1 C的电化学测试中，前三次充放电循环的放电比容量分别为803.7 mAh g‑1，521.3 mAh g‑1，454.7 mAh g‑1，经过100次循环后放电比容量为210.3 mAh g‑1，此外，在0.5 C的高电流密度下充放电放电容量仍能保持在176.5 mAh g‑1。
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