利用循环伏安法 (CV )、恒流充放电、电化学阻抗谱 (EIS)等电化学手段研究了溶胶凝胶法制备的尖晶石型LiMn2 O4 的电化学性质。结果表明用溶胶凝胶法制备的样品放电容量大 ,可逆性好 ,其中 5 5 0℃煅烧的样品电化学性能最好 ;XRD结果表明 ,样品经过充放电 ,尖晶石结构仍保留 ,但出现深度放电产物Li2 Mn2 O4 。The electrochemical properties of spinel LiMn 2O 4 electrodes prepared by a sol gel method were studied by cyclic voltammetry, constant current charge discharge and electrochemical impedance spectrum(EIS) techniques. The experimental results showed that the electrochemical performance of the samples prepared by sol gel method was better than that of the sample prepared by normal method. The electrochemical performance of the sample prepared by sol gel method at 550℃ showed the best electrochemical performance. After constant current charge discharge the spinel structures in all samples were reserved and deeply discharging product Li 2Mn 2O 4 was detected from XRD results.国家自然科学基金 ( 2 98330 90 );; “86 3”高技术发展计划 ( 715 -0 0 4-0 2 5 0
