Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 14, Pages 7702-7708Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b00645
Keywords
lithium ion batteries; cathode material; nickel rich; cation disorder; electrochemical properties
Funding
- Chinese National 973 Program [2015CB251100]
- National Natural Science Foundation of China [51472032, 51202083]
- Program for New Century Excellent Talents in University [NCET-13-0044]
- Special Fund of Beijing Co-construction Project
- BIT Scientific and Technological Innovation Project [2013CX01003]
- Beijing Science and Technology Committee [Z131100003413001]
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Li excess LiNi0.8Co0.1Mn0.1O2 was produced by sintering the Ni0.8Co0.1Mn0.1(OH)(2) precursor with different amounts of a lithium source. X-ray photoelectron spectroscopy confirmed that a greater excess of Li+ leads to an increase in the number of Ni2+ ions. Interestingly, the level of Li+/Ni2+ disordering decreases with an increase in Ni2+ content determined by the I-003/I-104 ratio in the X-ray diffraction patterns. The electrochemical measurement shows that the cycling stability and rate capability improve with an increase in Ni2+ content. After cycling, electrochemical impedance spectroscopy shows decreased charge transfer resistance, and the XRD patterns exhibit an increased I-003/I-104 ratio with an increase in Ni2+ content, reflecting the decrease in the level of Li+/Ni2+ disorder during cycling.
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