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Hierarchically porous carbon/red phosphorus composite for high-capacity sodium-ion battery anode

Hierarchically porous carbon/red phosphorus composite for high-capacity sodium-ion battery anode

作     者:Meng Li Na Feng Mengmeng Liu Zifeng Cong Jiangman Sun Chunhua Du Quanbin Liu Xiong Pu Weiguo Hu 

作者机构:CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and Sensor Beijing Institute of Nanoenergy and NanosystemsChinese Academy of Sciences School of Nannoscience and Technology University of Chinese Academy of Sciences School of Chemical Engineering and Light Industry Guangdong University of Technology Center on Nanoernergy Researh School of Physical Science and Technology Guangxi University 

出 版 物:《Science Bulletin》 (科学通报(英文版))

年 卷 期:2018年第63卷第15期

页      面:982-989页

核心收录:

学科分类:0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程(可授工学、理学学位)] 080502[工学-材料学] 

基  金:supported by the National Natural Science Foundation of China(51603013,61574018,and 21606050) the Youth Innovation Promotion Association of Chinese Academy of Sciences(CAS) ‘‘Hundred Talents Program"of CAS the National Key Research and Development Program of China(2016YFA0202703) 

主  题:Red phosphorus Hierarchical porous carbon Sodium ion batteries Anode 

摘      要:Red phosphorus has received remarkable attention as a promising anode material for sodium ion batteries(NIBs) due to its high theoretical capacity. However, its practical application has been impeded by its intrinsic low electronic conductivity and large volume variations during sodiation/desodiation process. Here, we design a composite to confine nanosized red phosphorus into the hierarchically porous carbon(HPC) walls by a vaporization-condensation strategy. The mass loading of P in the HPC/P composite is optimized to deliver a reversible specific capacity of 2,202 m Ah/gpbased on the mass of red P(836 m Ah/gcompositebased on the total composite mass), a high capacity retention over 77% after100 cycles, and excellent rate performance of 929 m Ah/gpat 2 C. The hierarchical porous carbon serves as the conductive networks, downsize the red phosphorus to nanoscale, and provide free space to accommodate the large volume expansions. The suppressed mechanical failure of the red phosphorus also enhances the stability of solid-electrolyte interface(SEI) layer, which is confirmed by the microscopy and impedance spectroscopy after the cycling tests. Our studies provide a feasible approach for potentially viable high-capacity NIB anode.

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