Journal
JOURNAL OF POWER SOURCES
Volume 346, Issue -, Pages 24-30Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2017.02.035
Keywords
LiCoO2; Surface coating; Magnetron sputtering; TiO2; High voltage; High temperature
Funding
- National Science Foundation of China [11234013, 21473022, 51502032, 21673033, 51603028]
- Science and Technology Bureau of Sichuan Province of China [2015HH0033]
- Fundamental Research Funds for the Central Universities of China [ZYGX2015J027]
- Opening Project of State Key Laboratory of Polymer Materials Engineering (Sichuan University) [SKLPME 2016-4-23]
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Surface coating is a key strategy in lithium-ion battery technologies to achieve a high and stable battery performance. Increasing the operation voltage is a direct way to increase the energy density of the battery. In this work, TiO2 is directly sputtered on as-fabricated LiCoO2 composite electrodes, enabling a controllable oxide coating on the topmost of the electrode. With an optimum coating, the discharge capacity is able to reach 160 mAh g(-1) (86.5% retention) after 100 cycles within 3.0-4.5 Vat 1 C, which is increased by 40% compared to that of the bare electrode. The high-voltage rate capability of LiCoO2 is also remarkably enhanced after Ti02-coating as reflected by the much larger capacity at 10 C (109 vs. 74 mAh g-1). The artificially introduced oxide coating is believed to make the LiCoO2 electrode more resistant to interfacial side reactions at high voltage and thus minimizes the irreversible loss of the active material upon long cycling. The TiO2 coating layer is also possible to partially react with the decomposition product of electrolyte (e.g. HF) and form a more stable and conductive interphase containing TiFx, which is responsible for the improvement of the rate capability. (C) 2017 Elsevier B.V. All rights reserved.
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