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Appl. Sci. 2018, 8(3), 378; https://doi.org/10.3390/app8030378

Improving the Electrochemical Performance of LiNi0.80Co0.15Al0.05O2 in Lithium Ion Batteries by LiAlO2 Surface Modification

Shandong YuHuang New Energy Technology Co. Ltd., Heze 274000, China
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Received: 27 October 2017 / Revised: 5 February 2018 / Accepted: 13 February 2018 / Published: 5 March 2018
(This article belongs to the Special Issue Electrode Materials for Lithium-ion Batteries/Super-capacitors)
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Abstract

LiNi0.80Co0.15Al0.05O2 (NCA) as a lithium ion battery cathode material has received attention for its highly specific capacity and excellent low temperature performance. However, the disadvantages of its high surface lithium compound residues and high pH value have influenced its processing performance and limited its application. This paper uses a facile method to modify NCA through LiAlO2 coating. The results showed that when the molar ratio of Al(NO3)3·9H2O and lithium compound residues at the surface of NCA cathode material was 0.25:1, the pH of the cathode material decreased from 12.70 to 11.80 and the surface lithium compound residues decreased from 3.99% to 1.48%. The NCA cell was charged and discharged for 100 cycles at 1 C in the voltage range of 3.0–4.3 V, to test the capacity retention of NCA. It was found to be as high as 94.67%, which was 5.36% higher than the control NCA cell. The discharge capacity of NCA-0.25-500 °C was 139.8 mAh/g even at 8 C rate, which was 15% higher than the raw NCA. Further research indicated that Al(NO3)3·9H2O reacted with the surface lithium compound residues of NCA and generated LiAlO2, which improved the NCA electrochemical performance. View Full-Text
Keywords: LiNi0.80Co0.15Al0.05O2; LiAlO2 coating; lithium compound residues; pH value; capacity retention LiNi0.80Co0.15Al0.05O2; LiAlO2 coating; lithium compound residues; pH value; capacity retention
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Song, C.; Wang, W.; Peng, H.; Wang, Y.; Zhao, C.; Zhang, H.; Tang, Q.; Lv, J.; Du, X.; Dou, Y. Improving the Electrochemical Performance of LiNi0.80Co0.15Al0.05O2 in Lithium Ion Batteries by LiAlO2 Surface Modification. Appl. Sci. 2018, 8, 378.

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