Journal
ELECTROCHIMICA ACTA
Volume 267, Issue -, Pages 94-101Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.02.062
Keywords
Lithium-ion battery; Silicon negative electrode; Li-Si alloy; Flake powder; Solid electrolyte interface
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Funding
- Japan Science and Technology Agency ALCA-SPRING
- Japan Society for the Promotion of Science KAKENHI [16H04649]
- Grants-in-Aid for Scientific Research [16H04649] Funding Source: KAKEN
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Silicon flake powder (Si LeafPowder (R), Si-LP) with the thickness and lateral dimension of 100 nm and 3 -5 mu m, respectively, demonstrated superior cycle performance as a negative electrode in lithium-ion batteries. A multi-folded layered structure with many voids was spontaneously formed in Si-LP composite electrodes by morphology changes of Si-LP sheets in repeated charge and discharge cycles. The multi-folded layered structure accommodated volumetric changes of the Si active material and prevented exfoliation of the active material from the current collector, which led to the superior long-term cyclability of the Si-LP electrode. The main factor for capacity fading in long-term cycling was a gradual loss of conduction pathways between Si-LP sheets due to the accumulation of electrolyte reduction products in the electrode. The film-forming additives, vinylene carbonate and fluoroethylene carbonate, effectively suppressed the electrolyte decomposition and remarkably improved the cycle performance of the Si-LP electrode. (C) 2018 Elsevier Ltd. All rights reserved.
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