Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 35, Pages 29643-29653Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b05986
Keywords
lithium-ion batteries; nickel-rich cathode material; microspheres; electrode/electrolyte interface; electrochemical properties
Funding
- National Key Research and Development Program of China [2016YFB0100500]
- National Natural Science Foundation of China [51672109, 21505050, 51272175]
- Natural Science Foundation of Shandong Province for Excellent Young Scholars [ZR2016JL015]
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The unstable electrode/electrolyte interface of high-capacity LiNi0.8Co0.15Al0.05O2 (NCA) cathodes, especially at a highly delithiated state, usually leads to the transformation of layered to spinel and/or rock-salt phases, resulting in drastic capacity fade and poor thermal stability. Herein, the Al-increased and Ni-,Co-decreased electrode surface is fabricated through tailoring element distribution in micrometer-sized spherical NCA secondary particles via coprecipitation and solid-state reactions, aimed at stabilizing the electrode/electrolyte interface during continuous cycles. As expected, it shows much extended cycle life, 93.6% capacity retention within 100 cycles, compared with that of 78.5% for the normal NCA. It also delivers large reversible capacity of about 140 mAh g(-1) even at 20 C, corresponding to energy density of around 480 Wh kg(-1), which is enhanced by 45% compared to that of the normal NCA (about 330 Wh kg(-1)). Besides, the delayed heat emission temperature and reduced heat generation mean remarkably improved thermal stability. These foregoing improvements are ascribed to the Al-increased spherical secondary particle surface that stabilizes the electrode/electrolyte interface by protecting inner components from directly contacting with electrolyte and suppressing the side reaction on electrode surface between high oxidizing Ni4+ and electrolyte.
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