【摘要】 锰酸锂(LiMn2O4)因其低毒、廉价和安全等优点被认为是最具潜力的锂离子二次电池正极材料之一,近年来被广泛研究.采用新型动态水热法成功地合成了一系列分散均匀的LiMn2O4纳米材料,并运用XRD,SEM,TEM,EIS和充放电测试等多种方法表征其晶相、形貌和电化学性能.结果表明:水热溶液中LiOH的浓度对产品性能有很大影响.当LiOH浓度为0.4mol/L时制得的LiMn2O4材料颗粒分散性较好,颗粒表面比较光滑均匀(40~100nm之间),且表现出良好的电化学性能.在0.1C倍率循环时,LiMn2O4材料的首次放电比容量为118.4mAh/g,循环50周后容量保持率为90.5%.更多还原

【Abstract】 LiMn2O4is considered one of the most promising cathodes in lithium ion batteries and has been receiving tremendous attentions in terms of its low toxicity,low cost and good safety.In this work,series of homogenous LiMn2O4 nanomaterials were successfully synthesized via a modified dynamic hydrothermal route.Various measurements including XRD,SEM,TEM,EIS and charging/discharging test were used to confirm the crystalline phase,morphology and electrochemical performances.It is demonstrated that the LiOH concentrations in the hydrothermal solution greatly affect the morphology and electrochemical behaviors of the resultant products.The sample obtained at 0.4mol/L LiOH exhibited a good distribution(40~100nm)with smooth particle surface and a considerable capability for lithium storage.At 0.1C,the initial reversible capacity was 118.4mAh/g and maintained 90.5%after 50 cycles.更多还原