【摘要】 以乙醇胺醋酸盐作为反应介质,采用硫酸铬、一水氢氧化锂和新制备二氧化锰为原料,在常压低温下采用离子热法和后续高温处理,制备了正极材料Li Mn2O4及其掺杂改性物Li Cr0.1Mn1.9O4。分别对材料的形貌和电化学性能进行XRD、SEM和充放电测试。SEM测试结果表明:Li Mn2O4和Li Cr0.1Mn1.9O4均为棒状结构,集中呈现为长宽分别为1.2μm、200 nm。充放电测试表明:金属铬的掺杂能有效提高材料的循环性能,在0.1 C倍率下,材料Li Cr0.1Mn1.9O4首次放电比容量为123.6 m A·h/g,经历前10个循环的容量少量衰减后,其后的50次循环中容量基本不变。更多还原

【Abstract】 The Li Mn2O4 and its Cr-doped cathode material Li Cr0.1Mn1.9O4 were synthesized by ionothermal method,using bis-(1-hydroxyethyl) ammonium acetate as the reaction mediums at an atmospheric pressure and a low temperature with Cr2(SO4)3,Li OH·H2O,and Mn O2 as sources,and followed by heat treatment.The materials were characterized by X-ray diffraction,scanning electron microscopy,and electrochemical test,respectively.The SEM result indicated that the Li Mn2O4 and Li Cr0.1Mn1.9O4 materials had rod-like structure with the length of about 1.2 μm and the diameter of about 200 nm.The galvanostatic charge-discharge tests demonstrated that a small amount of Cr could effectively improve the electrochemical performance of the materials,and Li Cr0.1Mn1.9O4 material had an initial discharge specific capacity of 123.6 m A·h/g at 0.1 C.Furthermore,the discharge capacities of Li Cr0.1Mn1.9O4 sample faded slowly before 10 cycles and then remained unchanged in following 50 cycles.更多还原