Silicon algae with carbon topping as thin-film anodes for lithium-ion microbatteries by a two-step facile method

JOURNAL OF POWER SOURCES

卷:274

Article

Biserni, E.^1,2  Xie, M.³  Brescia, R.⁵  Scarpellini, A.⁵  Hashempour, M.⁶  Movahed, P.⁶  George, S. M.^3,4  Bestetti, M.⁶  Li Bassi, A.^1,2  Bruno, P.¹ 

[1] Ist Italiano Tecnol, Ctr Nano Sci & Technol PoliMi, I-20133 Milan, Italy

[2] Politecn Milan, Dept Energy, I-20133 Milan, Italy

[3] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA

[4] Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA

[5] Ist Italiano Tecnol, Dept Nanochem, I-16163 Genoa, Italy

[6] Politecn Milan, Dept Chem Mat & Chem Engn Giulio Natta, I-20131 Milan, Italy

关键词: Lithium ion battery;    Silicon anodes;    Silicon nanostructures;    Porous silicon;    Cycle life;    SEI layer;   

DOI  :  10.1016/j.jpowsour.2014.09.140

来源: Elsevier

【 摘 要 】

Silicon-based electrodes for Li-ion batteries (LIB) attract much attention because of their high theoretical capacity. However, their large volume change during lithiation results in poor cycling due to mechanical cracking. Moreover, silicon can hardly form a stable solid electrolyte interphase(SEI) layer with common electrolytes. We present a safe, innovative strategy to prepare nanostructured silicon-carbon anodes in a two-step process. The nanoporosity of Si films accommodates the volume expansion while a disordered graphitic C layer on top promotes the formation of a stable SEI. This approach shows its promises: carbon-coated porous silicon anodes perform in a very stable way, reaching the areal capacity of similar to 175 mu Ah cm(-2), and showing no decay for at least 1000 cycles. With requiring only a two-step deposition process at moderate temperatures, this novel very simple cell concept introduces a promising way to possibly viable up-scaled production of next-generation nanostructured Si anodes for lithium-ion microbatteries. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free