ISSN 1608-4039 (Print)
ISSN 1680-9505 (Online)

For citation:

Kharchikova E. V., Bulyukina V. A., Ushakov A. V. Electrochemical System of LiTi2(PO4)3 | 1 M Aqueous Li2SO4 | LiFePO4 and Prototypes of the Lithium-Ion Battery Based on it. Electrochemical Energetics, 2019, vol. 19, iss. 4, pp. 173-185. DOI: 10.18500/1608-4039-2019-19-4-173-185, EDN: YLWCGK

This is an open access article distributed under the terms of Creative Commons Attribution 4.0 International License (CC-BY 4.0).
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Language: 
Russian
Heading: 
Lithium and post‑lithium electrochemical systems
Article type: 
Article
UDC: 
544.6.018
DOI: 
10.18500/1608-4039-2019-19-4-173-185
EDN: 
YLWCGK

Electrochemical System of LiTi2(PO4)3 | 1 M Aqueous Li2SO4 | LiFePO4 and Prototypes of the Lithium-Ion Battery Based on it

Autors: 
Kharchikova Evgeniya Vital'evna, Saratov State University
Bulyukina Viktoriya Aleksandrovna, Research Institute of Chemical Power Sources (Joint-Stock Company)
Ushakov Arseni Vladimirovich, Saratov State University
Abstract: 

The use of aqueous electrolyte in lithium-ion energy storage systems can choose some of the problems associated with the use of electrolytes based on organic solvents, such as a risk of ignition of an abnormal violation of tightness and the sensitivity of operational parameters to production conditions. As part of the development of one of these systems, LiTi2(PO4)3 | aqueous Li2SO4 (1 mol·l −1 ) | LiFePO4, a technique for their implementation in the form of prototypes made using a film for lamination using an office laminator is proposed. Testing of the prototypes revealed a positive correlation of the specific capacity and specific energy of the LiTi2(PO4)3 and the full battery prototype and the cycling stability with an increase of LiFePO4 : LiTi2(PO4)3 ratio by weight from 0.33 to 2.15. The maximum specific discharge capacity of LiTi2(PO4)3 was observed for the prototype with a mass ratio of 1.74 and amounted to 116 mA·h·g −1 . At the same time, the specific discharge capacity of LiFePO4 varies in a wide range from 41 to 104 mA·h·g −1 without significant correlation with the balance of active materials, and these values are much smaller than demonstrated by it in a half-cell with guaranteed absence of the influence of processes on the counter electrode (146 mA·h·g −1 ).

Key words: 
aqueous lithium-ion battery
battery prototype
iron(II)-lithium phosphate
olivine
lithium-titanium(IV) phosphate
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Received: 
14.10.2019
Accepted: 
01.11.2019
Published: 
23.12.2019