Evaluation of Lithium-battery Conductive Slurry Dispersion byNuclear Magnetic Resonance Technology
ZHOU Ping1,LUAN Zhenchao2
1. Xiamen Institute of Measurement and Testing, Xiamen, Fujian 361000, China
2. Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Abstract The positive conductive slurries prepared by different types of conductive particles for lithium batteries are studied by using nuclear magnetic resonance (NMR) technology. By measuring the relaxation time and spectrum of the slurries, it is found that the relaxation time of carbon black slurry is negatively correlated with the BET value under the same grinding dispersion condition, and the relaxation spectrum of carbon black slurry is single-peak structure, indicating that carbon black is more easily dispersed. The relaxation spectra of carbon nanotube (CNT) slurry are all multi-modal, which indicates that the dispersion of CNT is poor. Further research results show that the larger the solid content of CNT slurry, the larger the specific surface area of the particles, the larger the relaxation time of the main peak of the relaxation spectrum, the lower the proportion of the main peak signal, indicating that the CNT is more prone to entanglement and aggregation in the solvent.
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2024, Vol. 45 
