1. Hierarchical macropore-mesoporous shell carbon dispersed with Li4Ti5O12 for excellent high rate sub-freezing Li-ion battery performance.
- Author
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Ho, Ching-Kit, Li, Chi-Ying Vanessa, Deng, Zhaofeng, Chan, Kwong-Yu, Yung, Hoi, and Yang, Chunzhen
- Subjects
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LITHIUM-ion batteries , *CARBON composites , *ELECTRON transport , *CARBON , *BIOLOGICAL transport , *FREEZING - Abstract
The significant reduction in capacity and cyclability of lithium-ion batteries (LIBs) at low temperature is still limiting its application in cold climate. Limited literature has addressed the low temperature performance of LIB anodes, mostly restrict to low current performance showing low durability (<100 cycles). This is the first report of excellent durability in Li 4 Ti 5 O 12 -based composite cycling at a high current (10C) over 1000 cycles under sub-zero temperatures. We embed Li 4 Ti 5 O 12 nanoparticles in hierarchical macropore-mesoporous shell carbon network (HCMS carbon) to form Li 4 Ti 5 O 12 /HCMS carbon nanocomposite. The HCMS carbon is an ideal support for Li 4 Ti 5 O 12 to achieve excellent high rate sub-freezing LIB performance by providing short, intertwining Li-ion diffusion pathways between embedded Li 4 Ti 5 O 12 particles and Li-ion reservoirs, and ample routes for continuous, multi-directional electron flow to Li 4 Ti 5 O 12 particles. At −20 °C, the Li 4 Ti 5 O 12 /HCMS carbon composite delivers the highest literature-reported specific energy of 80 Wh/kg at a high specific power of 3000 W/kg. This work demonstrates our Li 4 Ti 5 O 12 /HCMS carbon composite can be a viable LIB anode material with fast and efficient Li-ion and electron transport active in sub-zero temperature operation. Image 1 [ABSTRACT FROM AUTHOR]
- Published
- 2019
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