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以Li Ac·2H2O、Mn(Ac)2·4H2O、Ni(Ac)2·4H2O和Cr(NO3)3·9H2O为原料,柠檬酸为络合剂,用溶胶-凝胶法合成Li1.016Cr0.103Mn0.464Ni0.356O2。通过XRD、SEM、电感耦合等离子体(ICP)发射光谱和电化学性能测试,考察反应温度的影响。材料具有典型的富锂层状固溶体型的晶体结构特征,最佳反应温度为85℃,合成的材料颗粒尺寸均一,约为150 nm。材料在2.0~4.8 V循环,0.1 C(25 m A/g)首次放电比容量为190 m Ah/g;经0.1 C、0.2 C、0.5 C和1.0 C循环20次后,容量保持率分别为86%、88%、90%和88%,且1.0 C最大放电比容量仍保持在95 m Ah/g。
Li1.016Cr0 was synthesized by sol-gel method using Li Ac.2H2O, Mn (Ac) 2.4H2O, Ni (Ac) 2.4H2O and Cr (NO3) 3 9H2O as raw materials and citric acid as complexing agent. 103Mn0.464Ni0.356O2. The effect of reaction temperature was investigated by XRD, SEM, inductively coupled plasma (ICP) emission spectroscopy and electrochemical performance tests. The material has the typical lithium-rich layered solid solution crystal structure characteristics. The optimum reaction temperature is 85 ℃, and the size of synthesized materials is uniform, about 150 nm. The initial discharge specific capacity of 0.1 C (25 m A / g) was 190 mAh / g at 2.0 ~ 4.8 V and 20 cycles at 0.1 C, 0.2 C, 0.5 C and 1.0 C, respectively. The capacity retention rates were 86%, 88%, 90% and 88%, respectively, and the maximum discharge specific capacity of 1.0 C remained at 95 m Ah / g.