Effect of ethanol-assisted electrode fabrication on the performance of silicon anodes
2010 (English)In: Journal of Power Sources, ISSN 0378-7753, Vol. 195, no 16, 5370-5373 p.Article in journal (Refereed) Published
The performance of high-silicon-content anodes was tested as a function of silicon particle-size (44 mu m, 1.8 mu m and 70-100 nm), surface pre-treatment and solvent chosen for anode preparation. Two simple procedures, leading to significant improvements in electrode performance are reported. First, pretreatment of nano-Si in ethanol which unexpectedly yields functionalised surfaces improving cycling stability. Second, the use of a 30:70 solution of ethanol and water to dissolve the CMC-binder for the electrode preparation boosts specific battery capacity. Ethanol pre-treatment of nano-Si also resulted in improved adhesion of the electrode to the current collector as well as in de-agglomeration of nano-Si powder. All these treatments improved capacity stability during cycling. Changes in surface chemistry of nano-Si before and after ethanol treatment have been analysed by XPS. A stable capacity of about 1630 mAh g(-1) was obtained after 25 cycles for an electrode containing 80% silicon using ethanol during electrode coating preparation.
Place, publisher, year, edition, pages
2010. Vol. 195, no 16, 5370-5373 p.
Li-ion batteries, Si-based anodes, XPS analysis, Nano-silicon, Ethanol treatment
Research subject Chemistry with specialization in Inorganic Chemistry
IdentifiersURN: urn:nbn:se:uu:diva-136435DOI: 10.1016/j.jpowsour.2010.03.042ISI: 000277868600024OAI: oai:DiVA.org:uu-136435DiVA: diva2:376936