Surface modification of LiNi0.5Co0.2Mn0.3O2 cathode materials with Li2O‐B2O3‐LiBr for lithium‐ion batteries
Document Type
Article
Publication Date
5-14-2019
Department
Department of Materials Science and Engineering
Abstract
LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode material suffers from phase transformation and electrochemical performance degradation as its main drawbacks, which are strongly dependent on the surface state of NCM523. Herein, an effective surface modification approach was demonstrated; namely, the fast lithium‐ion conductor (Li2O‐B2O3‐LiBr) was coated on NCM523. The Li2O‐B2O3‐LiBr coating layer as a protecting shell can prevent NCM523 particles from corrosion by the acidic electrolyte, leading to a superior discharge capacity, rate capability, and cycling stability. At room temperature, the Li2O‐B2O3‐LiBr–coated NCM523 exhibited an excellent capacity retention of 87.7% after 100 cycles at the rate of 1 C, which is remarkably better than that (29.8%) without the uncoated layer. Furthermore, the coating layer also increased the discharge capacity of NCM523 cathode material from 68.7 to 117.0 mAh g−1 at 5 C. Those can be attributed to the reduction in the electrode polarization and improvement in the electrode conductivity, which was supported by electrochemical impedance spectroscopy and cyclic voltammetry measurements.
Publication Title
International Journal of Energy Research
Recommended Citation
Wang, L.,
&
Hu, Y. H.
(2019).
Surface modification of LiNi0.5Co0.2Mn0.3O2 cathode materials with Li2O‐B2O3‐LiBr for lithium‐ion batteries.
International Journal of Energy Research,
43(9), 4644-4651.
http://doi.org/10.1002/er.4601
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/451
Publisher's Statement
© 2019 John Wiley & Sons, Ltd. Publisher's version of record: https://doi.org/10.1002/er.4601