期刊
ELECTROCHIMICA ACTA
卷 155, 期 -, 页码 140-147出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.12.122
关键词
Aqueous binders; Hydrocolloids; Graphite; Anodes; Lithium-ion batteries
资金
- Spanish Ministry of Economy and Competitiveness MINECO [ENE2008-06516, ENE2011-28318]
- Spanish Research Council for Scientific Research (CSIC)
- European Social Fund (ESF)
- Spanish Ministry of Economy and Competitiveness (MINECO) [BES-2012-052711]
A series of seven different hydrocolloids are tested as water-soluble binders for synthetic graphite (SG)based electrodes of lithium-ion batteries (LIBs) and compared with the standard poly(vinylidene difluoride) (PVDF) binder. The hydrocolloids selected are sodium carboxymethyl cellulose (Na-CMC), sodium alginate (Na-Alg), gum arabic (GA), xanthan gum (XG), guar gam (GG), agar-agar (AA) and carrageenan (CAR), the latter three with no precedents in the literature. They all show thermal and electrochemical stability under the experimental conditions employed. For SG/hydrocolloid electrodes, binder concentrations of 5 wt% are found to be optimal, providing outstanding electrochemical performances for electrodes with Na-Alg Na-CMC, XG and GG in galvanostatic cycling experiments at constant (C/10, with C = 372mA g(-1)) and variable (from C/10 to 2C) current rates, which are comparable, or even superior to those of SG/PVDF electrodes with higher binder content (8 wt%). In contrast, SG/GA, SG/CAR and SG/AA electrodes show poorer electrochemical performances, most likely owing to the low adhesion capacity of the binder (GA and CAR), or the formation of films covering the SG particles (CAR and AA). (C) 2014 Elsevier Ltd. All rights reserved.
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