An amorphous Zn-P/graphite composite with chemical bonding for ultra-reversible lithium storage

Li, Wenwu1,3; Yu, Jiale1; Wen, Jiajun1; Liao, Jun1; Ye, Ziyao1; Zhao, Bote3; Li, Xinwei4; Zhang, Haiyan1; Liu, Meilin3; Guo, Zaiping2

2019-07-28

10.1039/c9ta01431d

Journal of Materials Chemistry A   影响因子和分区

2050-7488

2050-7496

Finding low-cost and large-capacity anode materials to replace the commercially available graphite is an urgent need to meet the ever-increasing demand for high energy density Li-ion batteries (LIBs). Due to their suitable working potential, high theoretical capacity and low polarization, phosphides have attracted increasing interest as promising anode candidates for LIBs. However, phosphides suffer from large volume variation and low ionic and electronic conductivity, limiting the long-term cycling stability and rate capability. Herein, we report ZnP2/C derived from alfa-ZnP2 (tetragonal) and graphite as a highly reversible anode for LIBs. Alfa-ZnP2 (tetragonal) has been found to more easily form an amorphous composite with graphite with P-C bonds compared to Zn3P2. The amorphous structure could dramatically reduce the risk of fracture during cycling, profiting from an isotropic stress and the P-C bonds could enhance the Li-ion and electron transfer capability. Therefore, the ZnP2/C composite demonstrates significantly attractive performance in terms of reaction kinetics, energy efficiency and cycling stability with a specific capacity of 1270 mA h g(-1) after 2730 cycles, making it superior to other Zn-P compounds and even other transition metal phosphide anodes. The highly reversible lithium storage capability of the ZnP2/C composite can be mainly attributed to the pseudocapacitive contribution. Additionally, the Li-ion full cell LiCoO2//ZnP2/C delivers 1200 mA h g(-1) even after 200 cycles with an average working potential of 3.5 V, demonstrating its potential for application in next-generation Li-ion batteries. Broadly, this work would open an avenue for selecting appropriate phases and designing structural engineering with new chemical bonds to achieve ultralong cycling stability and ultrahigh rate performance.

SCI ; EI

英语

通讯

China Postdoctoral Science Foundation[1112000139]

Chemistry ; Energy & Fuels ; Materials Science

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary

WOS:000476599900016

ROYAL SOC CHEMISTRY

20192907210399

Anodes ; Bond strength (chemical) ; Chemical stability ; Costs ; Energy efficiency ; Graphite ; Ions ; Lithium compounds ; Lithium-ion batteries ; Phosphorus compounds ; Reaction kinetics ; Transition metals

Energy Conservation:525.2 ; Metallurgy and Metallography:531 ; Electron Tubes:714.1 ; Chemistry:801 ; Physical Chemistry:801.4 ; Chemical Reactions:802.2 ; Cost and Value Engineering; Industrial Economics:911

Web of Science

1.Guangdong Univ Technol, Sch Mat & Energy, Guangzhou 510006, Guangdong, Peoples R China
2.Univ Wollongong, Sch Mech Mat & Mech Engn, Inst Superconducting & Elect Mat, North Wollongong, NSW 2500, Australia
3.Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA
4.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518071, Peoples R China

Li, Wenwu,Yu, Jiale,Wen, Jiajun,et al. An amorphous Zn-P/graphite composite with chemical bonding for ultra-reversible lithium storage[J]. Journal of Materials Chemistry A,2019,7(28):16785-16792.

Li, Wenwu.,Yu, Jiale.,Wen, Jiajun.,Liao, Jun.,Ye, Ziyao.,...&Guo, Zaiping.(2019).An amorphous Zn-P/graphite composite with chemical bonding for ultra-reversible lithium storage.Journal of Materials Chemistry A,7(28),16785-16792.

Li, Wenwu,et al."An amorphous Zn-P/graphite composite with chemical bonding for ultra-reversible lithium storage".Journal of Materials Chemistry A 7.28(2019):16785-16792.