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- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received February 12, 2023
Revised June 25, 2023
Accepted July 10, 2023
- Acknowledgements
- This study was supported by the Technology Innovation Program (20007171, Development of artificial graphite from cokes and binder/coating pitch for anode materials) funded by the Ministry of Trade, Industry, and Energy (MOTIE, Korea) and by the Technology Innovation Program (20006696, Development of isotropic graphite block for semiconductor process) funded by the Ministry of Trade, Industry, and Energy (MOTIE, Korea).
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Optimization of the molecular weight range of coating pitch and its effect on graphite anodes for lithium-ion batteries
1C1 Gas & Carbon Convergent Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Korea 2Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Korea 3Advanced Materials and Chemical Engineering, University of Science and Technology (UST), Daejeon 34113, Korea
jsim@krict.re.kr
Korean Journal of Chemical Engineering, December 2023, 40(12), 2839-2846(8), 10.1007/s11814-023-1529-5
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Abstract
This study aimed to optimize the molecular weight range of coating pitch to enhance the electrochemical
performance of graphite-based anodes used in lithium-ion batteries by understanding the characteristics of the coating
pitch. The coating pitch was divided into four fractions based on its solubility in hexane, acetone, toluene, and nmethyl-2-pyrrolidone (NMP). These four fractions were estimated based on the thickness and homogeneity of the
coated surfaces. The lighter fractions of pitch, such as hexane and acetone, assisted in forming a homogeneous surface
by decreasing the viscosity during carbonization. Heavy fractions, such as toluene and NMP, were the main components of the coating. They improved the rate performance of the anode by forming an isotropic layer, which increased
the number of lithium-ion intercalation sites. However, thick surfaces increased the charge-transfer resistance because
of the increased diffusion path lengths of lithium ions. The pitch molecular weight fractions of 128-768, 768-1152, and
1,152-1,480 m/z should be controlled to 70-84.49, 11.20-18.21, and 3.35-5.15%, respectively. Furthermore, the results of
this study can be applied to optimize the coating properties for other anode materials, such as silicon, at a controllable
pitch coating thickness according to the molecular weight.
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36. S.-H. Choi, G. Nam, S. Chae, D. Kim, N. Kim, W. S. Kim, J. Ma, J.
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