Three-dimensional hierarchical Ca 3 Co 4 O 9 hollow fiber network as high performance anode material for lithium-ion bat
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ree-dimensional hierarchical Ca3Co4O9 hollow fiber network as high performance anode material for lithium-ion battery 1,2†
GUAN ShouJie 1
1,2†
1,2
2
1,2
, FAN QingLu , LIU LiYing , LUO JunCai , ZHONG YiCheng , 3 4 1,2* ZHAO WeiMin , HUANG ZhenCai & SHI ZhiCong
Smart Energy Research Centre, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China; 2 Guangdong Engineering Technology Research Center for New Energy Materials and Devices, Guangzhou 510006, China; 3 College of Chemical Engineering and Safety, Binzhou University, Binzhou 256503, China; 4 Hangzhou LIAO Technology Co., Ltd., Hangzhou 310000, China Received March 28, 2020; accepted May 18, 2020; published online October 20, 2020
Transition metal oxides have high specific capacity as anode materials for lithium-ion battery. But aggregation of particles and volume expansion during lithiation/delithiation restrict their application. In this work, a three-dimensional hierarchical Ca3Co4O9 hollow fiber network assembled by nanosheets is prepared by a electrospinning combining with heat treatment method to overcome these issues and to boost its lithium storage performance. As-synthesized sample possesses excellent cyclic stability −1 −1 −1 −1 (578.6 mA h g at 200 mA g after 500 cycles) and rate performance (293.5 mA h g at 5000 mA g ), much better than those of commercial Co3O4. Furthermore, the fast kinetics of the three-dimensional Ca3Co4O9 hollow fiber network is also confirmed by the variable scan rates CV tests and the EIS measurements, which is dedicated to the specific hierarchical hollow fiber network structure that provides shorter ion transport distances and higher electrical conductivity. This work supplies a universal approach to improve the electrochemical performance of transition metal oxides for lithium ion batteries. lithium ion battery, anode material, cobalt oxides, electrospinning, hierarchical structure Citation:
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Guan S J, Fan Q L, Liu L Y, et al. Three-dimensional hierarchical Ca3Co4O9 hollow fiber network as high performance anode material for lithium-ion battery. Sci China Tech Sci, 2020, , https://doi.org/10.1007/s11431-020-1643-5
Introduction
Lithium-ion batteries (LIBs) are the most popular power sources for consumer electronics, electric vehicles, and future smart grids as well [1,2]. With the rapid development of cathode materials, anode materials and electrolyte, LIBs deliver more and more energy and power for devices [3–5]. Although graphite is the most widely used anode material for LIBs, it exhibits very limited theoretical capacity −1 (372 mA h g ) [6]. Therefore, transition metal oxides (TMs), such as Fe3O4, Co3O4, MnO2, CuO, ZnMn2O4 and ZnFe2O4, are considered as most promising anode materials †These authors contributed equally to this work. *Corresponding author (email: [email protected])
due to high theoretical capacity and low cost [7–12]. In addition, TMs also delivered better safety owing to the higher lithium intercalation voltage [13]. Among them, the reversible theoretica
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