A unique nanosheet assembled CoMn2O4 hollow nanospheres as superior cyclability anode materials for lithium-ion batteries

被引:22
作者
Zhang, Yao [1 ]
Gao, Wenkai [1 ]
Ji, Shaowei [1 ]
Jia, Nengqin [1 ]
机构
[1] Shanghai Normal Univ, Coll Chem & Mat Sci, Shanghai Key Lab Rare Earth Funct Mat, Key Lab Resource Chem,Educ Minist, Shanghai 200234, Peoples R China
基金
中国国家自然科学基金;
关键词
Nanosheet; CoMn2O4 hollow nanospheres; Superior cyclability; Anode; Lithium-ion batteries; HIGH-PERFORMANCE ANODE; SPHERES; MICROSPHERES; STORAGE; NANOPARTICLES; NANOSTRUCTURES; FABRICATION; NANOFIBERS; MNCO2O4; ZNCO2O4;
D O I
10.1016/j.jallcom.2019.02.004
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Although promising, the use of single-phase ternary mixed transition-metal oxides as anode materials of lithium-ion batteries is still accompanied with drawbacks, such as inferior cycling stability. To address these issues, the application of morphologically elaborate nanostructured materials has been suggested. This paper presents herein a new approach to constructing uniformly nanosheet assembled CoMn2O4 hollow nanospheres, which involves a combustion method assisted by polystyrene nanospheres (PS) templates. To realize the desired morphologies, a crucial step is the controlled growth of metal ions with specific molar ratios in a sulfonated PS gel and a key control parameter is the heating rate needed to ensure hollow architecture. The resulting CoMn2O4 hollow nanosphere anode exhibits satisfactory initial discharge capacity of 1269.1 mAh g( -1) and charge capacity of 790.6 mAh g(-1) at 200 mA g(-1). When experiences 50 cycles in the potential window of 0.1-3.0 V, the anode also demonstrates superior cycling stability with capacity preservations are, respectively, 90.5%, 86.4% and 81.2% at 200 mA g(-1), 800 mA g(-1) and 1000 mA g(-1). These merits of hollow nanospheres lie in the fact that such structure can provide rapid ionic/electronic access to the active material and accommodate the volume variations of the CoMn2O4 anode with repeated Li(+ )insertions/extractions processes. (C) 2019 Elsevier B.V. All rights reserved.
引用
收藏
页码:428 / 433
页数:6
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