共 50 条
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
相关论文
共 50 条