期刊
ACS APPLIED ENERGY MATERIALS
卷 3, 期 1, 页码 565-572出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b01799
关键词
bismuth; N-doped carbon; porous structure; sodium-ion battery; sodiation; solution combustion synthesis
资金
- Ministry of Science and Technology of China [2017YFA0206700]
- National Natural Science Foundation of China [21822506, 51671107]
- NSFC/Research Grant council (RGC) of Hong Kong Joint Research Scheme [N_HKU728/17]
- Innovation Technology Fund [GHP/048/14]
- Research Grants Council [GRF 17300014]
- NSFC-RGC Joint Research Scheme
With a stable operating potential and a high theoretical specific capacity, bismuth metal is a promising candidate as the anode for sodium-ion batteries (SIBs). However, its rate capability, long cycling stability, sluggish kinetics, and electrode structure stability still needs to be significantly improved. Herein, a three-dimensional porous bismuth/nitrogen-doped carbon composite (Bi/N-C) was prepared via a scalable and facile solution combustion synthesis (SCS) method. The open porous structure allows fast Na+ transport and accommodates the 3.5 times volume changes during the charging/discharging process in SIB. The porous Bi/N-C anode exhibits an excellent rate capability of 379 mAh g(-1) at 0.05 A g(-1) close to the theoretical value of 385 mAh g(-1) and a stable reversible capacity at high rate of 206 mAh g(-1) at 5.0 A g(-1), after 1600 cycles. A high performance full SIB was demonstrated using the porous Bi/N-C anode and a Na3V2 (PO4)(3) cathode with a specific energy of similar to 120 Wh kg(-1) at a high specific power of 81 W kg(-1) based on the total mass of anode and cathode materials. These remarkable performances of the porous Bi/N-C, together with the simple energy-efficient synthesis, can motivate extension of the solution combustion synthesis to fabricate materials for other electrochemical power devices.
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