期刊
MATERIALS TODAY ENERGY
卷 9, 期 -, 页码 240-246出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2018.05.016
关键词
Lithiated titania; Mesoporous; Capacitive; Li-ion battery; High-power
资金
- National Key Research and Development Program [2016YFB0901600]
- NSF of China [61376056, 51672301, 51672295]
- Science and Technology Commission of Shanghai [14520722000, 16ZR1440500, 16JC1401700]
- Shanghai Science and Technology Development Funds [16QA1404200]
- Key Research Program of Chinese Academy of Sciences [KGZD-EW-T06]
Titania with intrinsic safety (without lithium deposition) has met the safety requirement for high-power batteries, however, its poor rate capability due to sluggish ion diffusion coefficients remains as a challenge. Here mesoporous structure titania with a fast ion-conducting surface layer through lithiation can achieve capacitive lithium storage: 220 mA h g(-1) at 1 C, 114 mA h g(-1) at 50 C, 93 mA h g(-1) at 100 C. The improvement in rate performance can be attributed to two factors: The resulting lithiated titania shows over 5 orders of magnitude improvement of conductivity (from 0.001 to 198.20 mu S cm(-1)) induced by the presence of bulk Ti3+, enabling an ultra-fast conduction path for electrons; The lithiated surface layer is favorable to faster lithium ion transport, addressing the limited lithium diffusion between the electrolyte and the active electrode materials. This new route may offer a general approach towards lithium batteries with capacitor-like rate performance. (C) 2018 Elsevier Ltd. All rights reserved.
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