Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 5, Pages 5015-5021Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b18834
Keywords
potassium-ion batteries; anode; sub-micro carbon fibers; CNT; flexible batteries
Funding
- National Natural Science Foundation of China [51674202, 51804259, 51521061]
- Fundamental Research Funds for Central Universities [G2018KY0002, 3102018jgc004]
- Key R&D Program of Shaanxi [2017ZDCXL-GY-08-03]
- Natural Science Foundation of Shaanxi Province [2018JQ2037]
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Potassium-ion batteries (KIBs) with potential cost benefits are a promising alternative to lithium-ion batteries (LIBs). However, because of the large radius of K+, current anode materials usually undergo large volumetric expansion and structural collapse during the charge-discharge process. Self-supporting carbon nanotubes encapsulated in sub-micro carbon fiber (SMCF@CNTs) are utilized as the KIB anode in this study. The SMCF@CNT anode exhibits high specific capacity, good rate performance, and cycling stability. The SMCF@CNT electrode has specific capacities of 236 mAh g(-1) at 0.1 C and 108 mAh g(-1) at 5 C and maintains over 193 mAh g(-1) after 300 cycles at 1 C. Furthermore, a combined capacitive and diffusion-controlled K+ storage mechanism is proposed on the basis of the investigation using in situ Raman and quantitative analyses. By coupling the SMCF@CNT anode with the K0.3MnO2 cathode, a pouch cell with good flexibility delivers a capacity of 74.0 mAh g(-1) at 20 mA g(-1). This work is expected to promote the application of KIBs in wearable electronics.
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