Journal
MATERIALS RESEARCH BULLETIN
Volume 45, Issue 4, Pages 456-459Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2009.11.007
Keywords
Layered compounds; Electrochemical properties Sol-gel chemistry; X-ray diffraction
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Funding
- National Natural Science Foundation of China [50902001]
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The effect of Li4Ti5O12 (LTO) coating amount on the electrochemical cycling behavior of the LiCoO2 cathode was investigated at the high upper voltage limit of 4.5 V. Li4Ti5O12 (<= 5 wt.%) is not incorporated into the host structure and leads to formation of uniform coating. The cycling performance of LiCoO2 cathode is related with the amount of Li4Ti5O12 coating. The initial capacity of the LTO-coated LiCoO2 decreased with increasing Li4Ti5O12 coating amount but showed enhanced cycling properties, compared to Chose of pristine material. The 3 wt.% LTO-coated LiCoO2 has the best electrochemical performance, showing capacity retention of 97.3% between 2.5 V and 4.3 V and 85.1% between 2.5 V and 4.5 V after 40 cycles. The coulomb efficiency shows that the surface coating of Li4Ti5O12 is beneficial to the reversible intercalation/de-intercalation of Li+. LTO-coated LiCoO2 provides good prospects for practical application of lithium secondary batteries free from safety issues. (C) 2009 Elsevier Ltd. All rights reserved.
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