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Identifying the Ele...
Identifying the Electrochemical Processes in LiFeSO4F Cathodes for Lithium Ion Batteries
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- Blidberg, Andreas, 1987- (författare)
- Uppsala universitet,Strukturkemi
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- Sobkowiak, Adam (författare)
- Uppsala universitet,Strukturkemi
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- Tengstedt, Carl (författare)
- Scania CV AB, Södertälje
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- Valvo, Mario (författare)
- Uppsala universitet,Strukturkemi
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- Gustafsson, Torbjörn, 1949- (författare)
- Uppsala universitet,Strukturkemi
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- Björefors, Fredrik, 1971- (författare)
- Uppsala universitet,Strukturkemi
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(creator_code:org_t)
- 2017-04-25
- 2017
- Engelska.
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Ingår i: ChemElectroChem. - : Wiley. - 2196-0216. ; 4:8, s. 1896-1907
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The electrochemical performance of tavorite LiFeSO4F can be considerably improved by coating the material with a conducting polymer (poly(3,4-ethylenedioxythiophene); PEDOT). Herein, the mechanisms behind the improved performance are studied systematically by careful electrochemical analysis. It is shown that the PEDOT coating improves the surface reaction kinetics for the Li-ion insertion into LiFeSO4F. For such coated materials no kinetic limitations remain, and a transition from solid state to solution-based diffusion control was observed at 0.6 mA cm−2 (circa C/2). Additionally, the quantity of PEDOT is optimized to balance the weight added by the polymer and the improved electrochemical function. Post mortem analysis shows excellent stability for the LiFeSO4F-PEDOT composite, and maintaining the electronic wiring is the most important factor for stable electrochemical cycling of LiFeSO4F. The insights and the methodology used to determine the rate-controlling steps are readily transferable to other ion-insertion-based electrodes, and the findings are important for the development of improved battery electrodes.
Ämnesord
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
Nyckelord
- Batteries; conducting polymers; electrochemistry; kinetics; lithium
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