摘要
为了改善LiMn2O4材料在锂离子电池应用中倍率放电性能和循环性能较差的问题,利用纳米化尺寸改善方案,对二维LiMn2O4纳米棒的储锂应用进行研究。通过水热法合成的α-MnO2纳米线与LiOH·H2O进行固相烧结制备尖晶石结构的LiMn2O4纳米棒,探讨水热反应时间、温度和反应物物质的量比对前驱体α-MnO2形貌结构和性能的影响。研究结果表明:制备的LiMn2O4纳米棒比表面积大,有利于缩短Li^+扩散距离,较大的长径比可减少循环过程中材料的团聚,从而赋予LiMn2O4优异的循环性能。LiMn2O4纳米棒在1C倍率充放电时初始放电容量为104.8 mA·h/g,循环150圈时依旧可以保持初始容量的84.4%,而在3C倍率充放电时可以保持初始容量的75%,显示了较高的电化学储锂性能。
To improve attenuation of electrical performance for LiMn2O4,the application of two-dimensional LiMn2O4 nanorods in lithium storage was studied by using the nano-size improvement scheme.LiMn2O4 nanorods were synthesized by solid phase sintering method using LiOH·H2O and single-crystalα-MnO2 nanowires obtained by hydrothermal method.And the effect of hydrothermal time,temperature and the ratio of reactant and salt on the morphology and structure were investigated.The results show that the prepared LiMn2O4 nanorods have large specific surface area and large aspect ratio,which benefits the diffusion distance of Li^+,and reduces the agglomeration of materials during cycling,thus endowing the superior cycling performance of LiMn2O4.The electrochemical test demonstrates that LiMn2O4 nanorods can maintain 84.4%of the initial discharge capacity which is 104.8 mA·h/g after 150 cycles at 1C rate,and 75%of the initial discharge storage can be maintained at 3C rate,which displays a better performance of electrochemical lithium storage.
作者
周钢
陈月皎
范洪波
ZHOU Gang;CHEN Yuejiao;FAN Hongbo(School of Environment and Civil Engineering,Dongguan University of Technology,Dongguan 523808,China;State key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第11期3211-3219,共9页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51901043)。
关键词
水热合成
固相烧结
锰酸锂纳米棒
锂离子电池
储锂性能
hydrothermal synthesis
solid phase sintering
lithium manganese oxide nanorods
lithium ion battery
lithium storage performance
