期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 27, 页码 24164-24171出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b07206
关键词
sodium-ion battery; catalytic graphitization; Prussian blue; graphene; ionic transport
资金
- National Materials Genome Project [2016YFB0700600]
- National Natural Science Foundation of China [21603007, 51672012]
- Shen-zhen Science and Technology Research Grant [JCYJ20150729111733470, JCYJ20151015162256516]
Sodium-ion batteries (SIBs) are now emerging as a low-cost alternative to the current lithium-ion batteries, but their performance is limited by the sluggish transportation of large Na ions in electrodes. Expanded graphite has been employed in enhancing the transport kinetics. However, high-performance graphite should be synthesized at high temperatures when using traditional methods, which inevitably increases the total cost of material production. To tackle the kinetic issue for SIBs, we develop a three-dimensional network of graphene during catalytic graphitization in carbon electrodes at a temperature as low as 450 degrees C by using Prussian blue as a precursor. Furthermore, a strategy is proposed to enhance the transport ability of the Na-ion in the network by controlling the diffusion distance of the Fe cluster and the distance between Prussian blue particles, leading to optimized performance with both excellent high-rate performance (167 mAh g(-1) at 1.0 A g(-1)) and high charging capacity (390 mAh g(-1) at 0.05 A g(-1)). The results provide insights into the engineering of ionic transport properties through low-temperature catalytic graphitization in electrodes for SIBs and help design high-performance and low-cost electrodes for large-scale energy storage systems.
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