Cycling-induced structure refinement of MnO nanorods wrapped by N-doped carbon with internal void space for advanced lithium-ion anodes

被引:13
作者
Wang, Yujie [1 ,2 ]
Chen, Xianchun [3 ]
Liu, Zhifang [4 ]
Wu, Hao [1 ]
Zhao, Hang [1 ]
Liu, Heng [1 ]
Zhang, Yun [1 ]
机构
[1] Sichuan Univ, Dept Adv Energy Mat, Coll Mat Sci & Engn, Chengdu 610064, Sichuan, Peoples R China
[2] Petrochina Southwest Oil & Gas Field Co, Res Inst Nat Gas Technol, Chengdu 610213, Sichuan, Peoples R China
[3] Sichuan Univ, Coll Mat Sci & Engn, Dept Inorgan Mat Engn, Chengdu 610064, Sichuan, Peoples R China
[4] Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China
关键词
MnO nanorod; N-doped carbon; Structure refinement; Lithium-ion anode; FACILE PREPARATION; RATIONAL DESIGN; BATTERY; NANOPARTICLES; GRAPHENE; LIFE; CAPACITY; STORAGE; ENERGY; MN3O4;
D O I
10.1016/j.apsusc.2019.02.144
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
To date, addressing the vital and ubiquitous issues of dramatical volume variation and inferior electro-conductivity is still a hindrance for promoting the practical application of metal oxide-based anode materials for lithium-ion batteries (LIBs). Here, a simple and facile tactic is explored to build an intriguing architecture of N-doped carbon-wrapped MnO nanorod with suitably internal void space (MnO@NC). The resulting N-doped carbon sheath could provide many merits towards booting electron/ion transfer, well encapsulating the refined MnO nanograins, partially buffering volume expansion of MnO during lithiation, and reducing the unwanted reaction for lithium-depletion as a separation layer. Moreover, the internal void space offers adequate space to accommodate volume change upon cycling, ensuring the structural integrity of the electrode. Therefore, the MnO@NC electrode delivers high Li+ storage capability (460 mAh g(-1) at 0.1 A g(-1)), superior cycling durability (570 mAh g(-1) at 1 A g(-1) over 600 loops). Analysis of the lithiation and delithiation behavior indicates that the further oxidation of Mn2+ has an insignificant contribution for the ever-increasing capacity during cycling. The intrinsic collapse and reconstruction of conversion reaction could transform the pea-like MnO nanorod into ultrafine nanograins well dispersed within N-doped carbon sheath, significantly contributing more capacity in the continuous discharge/charge process. This work is helpful to understand the microstructure-dependent capacity-increasing and believed to have great promising in tailoring conversion-type electrode materials with outstanding lithium-ion storage.
引用
收藏
页码:386 / 394
页数:9
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