Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 51, Pages 35336-35341Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b12650
Keywords
Na-ion battery; NASICON-structure; negative electrode; high-rate performance; pseudocapacitive effect
Funding
- 973 project [2015CB251103]
- NSFC [51472104, 51572107]
- Development Program of Science and Technology of Jilin Province [20150312002ZG]
- Jilin University [2016062]
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Exploring suitable electrode materials with high specific capacity and high-rate capability is a challenging goal for the development of Na-ion batteries. Here, we report a NASICON-structured compound, Ca0.5Ti2(PO4)(3), with respect to its synthesis and electrochemical properties. The electrode is found to enable fast Na+ ion diffusion owing to the rich crystallographic vacancies, affording a reversible capacity of 264 mA h g(-1) between 3.0 and 0.01 V. In particular, the hybrid Ca0.5Ti2(PO4)(3)@carbon exhibits remarkable rate performance with a discharge capacity of nearly 45 mA h g(-1) at a current density of 20 A g(-1), which is attributed to the pseudocapacitive effect.
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