Journal
JOURNAL OF POWER SOURCES
Volume 478, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.229072
Keywords
Activation; Downsizing; KV3O8; Cathode; Zinc; Battery
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science, and Technology of Korea (MEST) [NRF-2015M3D1A1069713, NRF-2019H1D8A2106002, NRF-2020R1A2B5B01095954, NRF-2020R1A6A1A03043435, NRF-2020M3H4A1A03084256]
Ask authors/readers for more resources
We demonstrate the feasibility of using KV3O8 with an interlayer distance of similar to 7.7 angstrom as a cathode material for zinc-ion batteries. Its electrochemical inactivity is circumvented through particle size reduction with an increase in the surface area to 33.2 m(2) g(-1) from 2.6 m(2) g(-1). The shortened diffusion path results in significant improvement of the capacity to 249 mAh (g-oxide)(-1) (25 mA g(-1): 0.1C) despite almost no capacity being delivered by the as-received KV3O8 particles. Structural investigation using ex situ X-ray diffraction and ex situ X-ray absorption near edge structure spectroscopy reveals that KV3O8 undergoes a single-phase reaction assisted by the V5+/4+ redox pair. This monotonous structural change results in capacity retention of approximately 85.1% for 200 cycles. The size effect also affects the rate capability. Namely, the electrode delivers a discharge capacity of 182 mAh g(-1) at a rate of 7C (1.75 A g(-1)), with similar to 82.8% retention of the initial capacity for 500 cycles in a continuous cycling test at 5C (1.25 A g(-1)). This work presents a facile approach that enables the use of materials with large interlayer distance as cathode materials for zinc-ion batteries.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available