Design of a Solid-State Lithium Battery Based on LiFePO4 Cathode and Polymer Gel Electrolyte with Silicon Dioxide Nanoparticles

Design of prototype for a solid-state lithium battery with LiFePO 4 cathode and nanocomposite polymer gel electrolyte is developed. The concept of an asymmetric solid-state electrolyte was used for better compatibility of the solid electrolyte/electrode interface. According to the concept, a silica-...

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Bibliographic Details
Published in:Russian journal of electrochemistry 2022-04, Vol.58 (4), p.329-340
Main Authors: Baymuratova, G. R., Khatmullina, K. G., Yudina, A. V., Yarmolenko, O. V.
Format: Article
Language:English
Subjects:
Asymmetry
Cathodes
Chemical synthesis
Chemistry
Chemistry and Materials Science
Electrochemistry
Electrolytes
Lithium
Lithium batteries
Nanocomposites
Nanoparticles
Physical Chemistry
Polyethylene glycol
Polymer gels
Polymers
Prototypes
Silicon dioxide
Solid electrolytes
Solid state
Transition layers
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Summary:Design of prototype for a solid-state lithium battery with LiFePO 4 cathode and nanocomposite polymer gel electrolyte is developed. The concept of an asymmetric solid-state electrolyte was used for better compatibility of the solid electrolyte/electrode interface. According to the concept, a silica-nanoparticle-based transition layer is used facing the lithium anode; a liquid electrolyte layer; facing the cathode. The composition of the liquid electrolyte is optimized. 1 M lithium bis-trifluoromethanesulfonyl imide solution in a dioxolane/dimethoxyethane mixture (2 : 1) is shown to be the best electrolyte for the forming of a transition ion-conducting layer between the nanocomposite polymer gel electrolyte and the LiFePO 4 cathode; 1 M LiBF 4 in gamma-butyrolactonee, for the synthesis of a cross-linked polymer gel electrolyte, as an inert liquid medium for the radical-polymerization reaction. Comparative tests of Li/LiFePO 4 battery prototypes showed the maximal capacity of the LiFePO 4 cathode to be as large as 170 mA h g –1 when using a nanocomposite polymer gel electrolyte based on polyethylene glycol diacrylate with 6 wt % SiO 2 with asymmetric interface.
ISSN:1023-1935
1608-3342
DOI:10.1134/S1023193522030041