Rheological properties and stability of NMP based cathode slurries for lithium ion batteries

被引：187

作者：

Bauer, Werner ^{[1
]}

Noetzel, Dorit ^{[1
]}

机构：

[1] Karlsruhe Inst Technol, Inst Appl Mat Mat Proc Technol, D-76344 Eggenstein Leopoldshafen, Germany

来源：

CERAMICS INTERNATIONAL | 2014年 / 40卷 / 03期

关键词：

Lithium ion batteries; Electrode manufacturing; Rheology; Viscoelasticity; Yield point; COMPOSITE ELECTRODES; CONDUCTIVE CARBON; BLACK; COAGULATION; DISPERSANT;

D O I：

10.1016/j.ceramint.2013.08.137

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Slurries for the manufacturing of cathodes for lithium ion batteries are compared regarding to their colloidal stability by means of rheology. Model formulations with nanoscaled LiFePO4 (LFP) and micron scaled Li(Ni,Mn,Co)O-2 (NMC) were prepared by using N-methyl-2-pyrrolidone (NMP) as solvent. Polyvinylidene difluoride (PVDF) binder and carbon black (CB) conducting additive were added at typical amounts of a few weight percent. The influence of these inactive electrode components on the physical stability of the dispersions was investigated by steady state and oscillation experiments. It is demonstrated that the addition of a high molecular weight PVDF binder is sufficient to establish gel formation by bridging flocculation in case of the nanoscaled cathode material. For the larger micron scaled particles, the formation of a stable coagulated state is also feasible but it requires the combination of a particulate CB gel and a strengthening PVDF polymer network. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：4591 / 4598

页数：8

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