本发明提供了一种三元金属化合物电极材料的制备方法，包括以下步骤：将镍盐、钴盐、锰盐、尿素、十二烷基硫酸钠和氟化铵溶于水中得到包含Ni2+、Co2+和Mn2+的反应液A；使反应液A进行水热反应，获得NiCoMn前驱体；将NiCoMn前驱体加入至乙醇中得到反应液B；将硫代乙酰胺与醋酸铵溶于乙醇得反应液C；将反应液C逐滴加入至反应液B中进行反应，反应完成后分离固体产物，即得到Ni‑Co‑Mn三元金属硫化物复合材料。本发明制得的复合材料作为超级电容器正极材料应用时，具有1159 C g‑1的优异比电容，在20 A g‑1电流密度下具有70.8%的优秀倍率性能，且10000次充放电循环后电容保持率能达到84.49%，在电学性能和稳定性上均具有优异表现。
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