Energy Storage Science and Technology ›› 2017, Vol. 6 ›› Issue (4): 806-809.doi: 10.12028/j.issn.2095-4239.2017.0102

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The use of sodium carboxymethyl cellulose in lithium-ion batteries

HUANG Qinghua, QIN Xing, ZHANG Na   

  1. Tianjin Lishen Battery Joint-Stock Co., Ltd., Tianjin 300384, China
  • Received:2017-05-14 Revised:2017-06-20 Online:2017-07-01 Published:2017-07-01

Abstract: The influence of water-soluble binder, sodium carboxymethyl cellulose (CMC) with two different structures, was investigated on the stability of graphite anode slurry for lithium-ion batteries and the associated electrochemical performance. CMC with a higher degree of substitution (DS) of 0.85 and a higher molecular mass of 650000 was found to be adsorbed more on the graphite particle surface compared with a lower DS of 0.65 and a lower molecular mass of 250000. This was attributed to higher viscosity and better solubility of the higher DS and molecular mass. Based on repulsive interactions between the adsorbed CMC, the graphite particles were well dispersed in the aqueous medium. It was concluded that a high DS with a high molecular mass would improve the stability of graphite anode slurries and hence enhance the electrochemical performance of Lithium-ion batteries.

Key words: sodium carboxymethyl cell, degree of substitution, molecular weight, graphite anode, electrochemical performance