“Nanocomposites and Nanomaterials”

Nanosized NCM 811 electrode material for high-rate lithium-ion batteries
Potapenko A.V.1,2, Kirillov S.A.2
1 University of Electronic Science and Technology of China. No.2006, Xiyuan Ave., West Hi-tech Zone, Chengdu, Sichuan 611731, PR China. 
E-mail: avoloshka@ukr.net
2 Joint Department of Electrochemical Energy Systems, 38A Vernadsky Ave., Kyiv 03142, Ukraine

Different kinds of active materials for lithium-ion batteries (LIBs) are widely developed in industry. Electrochemical properties of batteries significantly depend on their structure and methods of synthesis.
A novel citric acid route for obtaining LiNi0.8Co0.1Mn0.1O2 (NCM 811) with improved high-rate properties is implemented. Special attention is paid to the difference in the electrochemical properties of electrodes prepared with different binders. Two types of binders, viz., standard (pVdF) and novel one (LA132) are used for electrode manufacturing. 
It has been shown that the specific discharge capacities of NCM 811 prepared with LA132 and pVdF are 213 and 205 mAh·g-1 at 0.1C, respectively (Fig. 1). Increasing discharge current loads to 12C for electrodes with the pVdF binder and to 15C with LA132 return the specific capacities equal to 67 and 61 mAh·g-1, respectively. These results demonstrate excellent high-rate properties of the material synthesized by the novel method and will be prospective in future for new generation of LIBs.

Fig. 1.Galvanostatic charge-discharge curves at 0.1C for NCM 811 electrodes with LA132 (a) and pVdF (b) binders.