Journal
ELECTROCHIMICA ACTA
Volume 115, Issue -, Pages 399-406Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.10.117
Keywords
Lithium-ion battery; Cathode material; Li-rich; Coprecipitation; Li4Ti5O12 coating/blending
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Funding
- National High Technology Research and Development Program of China [SS2012AA110301, 2013AA110103]
- Science Foundation for Young Teachers of Northeast Normal University [12QNJJ014]
- Program for New Century Excellent Talents in University
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Li[Li0.2Mn0.54Ni0.13Co0.13]O-2 was prepared using a coprecipitation method and modified with Li4Ti5O12. The sample coated with 3 wt% Li4Ti5O12 exhibited the best cyclability and mean coulombic efficiency in the voltage range of 2.0-4.75 V. These improvements are attributed to the effective Li4Ti5O12 coating layer, which stabilizes the host structure, protects the electrode surface from electrolyte attack, and prevents the formation of a thick passive film on the electrode surface. The initial irreversible capacity loss was eliminated by blending with 10 wt% Li4Ti5O12, in the larger potential window of 1.5-4.75V. It was confirmed that the irreversible capacity loss decreased with increasing Li4Ti5O12 content; this is because Li4Ti5O12 offers a larger number of available sites for insertion of extracted lithium. (C) 2013 Elsevier Ltd. All rights reserved.
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