【摘要】 通过溶剂热方法制备了纯净的CuFeS2粉体,并分别以天然和合成的CuFeS2作为锂电池正极材料装配电池进行电化学性能测试.测试结果表明,合成的CuFeS2作为正极材料、碳纳米管作为导电剂装配的电池室温一次放电容量达到了1 300mAh/g,放电平台为1.75,1.50V;天然CuFeS2中含有C,O,Si,Al等杂质元素,室温一次放电容量为1 000mAh/g,放电平台以及放电曲线形状均与合成CuFeS2为正极材料时相似.CV曲线说明Li/CuFeS2电池在室温下具有循环潜力.400℃真空焙烧3h有利于去除所合成CuFeS2粉体表面的残留溶剂,降低电极片内阻.另外,研究了电池在不同放电倍率下的放电性能.更多还原

【Abstract】 Transition metal sulfides are very potential cathodic materials for lithium ion batteries.However,chalcopyrite CuFeS2 as cathodic active species has not been reported yet.In this study,we tested the electrochemical performance of the batteries with natural and synthesized CuFeS2 as cathodic active species.The results show that synthesized CuFeS2 has the initial discharge capacity of 1 300mAh/g at room temperature,and two discharge plateaus can be observed at 1.75V and 1.5V,respectively.Natural chalcopyrite CuFeS2 shows the similar discharge plateaus and curve shape to those of synthesized one,but has a lower initial discharge capacity(1 000mAh/g)due to containing impurity elements,such as C,O,Al and Si.Cyclic voltammograms shows that CuFeS2 has cyclic ability under room temperature.Vacuum sintering at 400℃ for 3h can remove the residual solvent and reduce internal resistance of electrode.Furthermore,the electrochemical performance of batteries at different discharge rates was also investigated.更多还原