本发明公开一种制备Cu掺杂SnSe2锂离子电池电极材料的水热方法，包括：称取SnCl2以及SeO2；放入水热反应斧内胆中；称取硝酸铜固体颗粒放进内胆中；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Cu掺杂SnSe2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433.1 mAh g‑1，415.4 mAh g‑1，395.9 mAh g‑1，经过100次循环后放电比容量仍保持在152 mAh g‑1。
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