Self-templated synthesis of hollow porous submicron ZnMn2O4 sphere as anode for lithium-ion batteries
Self-templated synthesis of hollow porous submicron ZnMn2O4 sphere as anode for lithium-ion batteries
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自模板合成空心多孔亚微米ZnMn2O4球作为锂离子电池负极
DOI：
10.1016/j.jallcom.2013.01.036
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发表时间：
2013-05-15
影响因子：
6.2
通讯作者：
Huang, Yun-Hui
中科院分区：
文献类型：
--
作者：
Chen, Xue-Fa;Qie, Long;Huang, Yun-Hui
以自制的MnCO 3微球为模板，成功制备了亚微米ZnMn 2 O 4空心多孔微球。空心多孔ZnMn 2 O 4球的形貌和结构演变，以及检查，以实现最佳的电化学性能。SEM图像显示，ZnMn 2 O 4样品由直径为25-50 nm的纳米颗粒形成的中空多孔亚微米球（0.5-1.0 μ m）组成。600摄氏度烧结的样品表现出最好的电化学性能。在100 mA·g（-1）的电流密度下，首次循环放电容量高达1260 mA·h·g（-1），40次循环后放电容量稳定在599 mA·h·g（-1）。即使在1000 mA g（-1）下，平均比容量仍为450 mA h g（-1）。其优异的电化学性能归功于其独特的中空多孔结构，不仅可以缓冲充放电过程中的体积变化，还可以促进电解液的渗透，从而缩短Li+离子的传输距离。(C)2013爱思唯尔有限公司版权所有。
Hollow porous submicron-sized ZnMn2O4 spheres have been successfully prepared using self-made MnCO3 spheres as template. The morphology and structure evolution of the hollow porous ZnMn2O4 spheres are well examined to achieve optimal electrochemical performance. The SEM image shows that the ZnMn2O4 sample is composed of hollow porous submicron spheres (0.5-1.0 mu m) formed by nanosized particles with diameters of 25-50 nm. The 600 degrees C-sintered sample exhibits the best electrochemical performance. At a current density of 100 mA g(-1), the discharge capacity is as high as 1260 mA h g(-1) for the first cycle and retains stably at 599 mA h g(-1) after 40 cycles. Even at 1000 mA g(-1), the average specific capacity is still 450 mA h g(-1). The excellent electrochemical performance can be attributed to its unique feature of hollow porous structure, which may not only buffer the volume variation during discharge/charge process with hollow interior, but also facilitate the electrolyte penetration and thus shorten the transport length of Li+ ions. (C) 2013 Elsevier B.V. All rights reserved.