Peculiarities of Lithium Pentatianate and Lithium – Vanadium(III) Phosphate Joint Operation in the Lithium-accumulating System

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A new electrochemical system with a negative electrode based on lithium pentatitanate Li4Ti5O12, a positive electrode based on the lithium-vanadium(III) phosphate Li3V2(PO4)3, 0.67M lithium chlorate(VII) LiClO4 solution in a mixture of propylene carbonate (PC) and 1,2-dimethoxyethane (DME) as an electrolyte is proposed and the features of its functioning are considered. Electrode materials based on Li4Ti5O12 and Li3V2(PO4)3 when tested in the electrochemical cell with the 0.67M LiClO4 in PC + DME electrolyte and a lithium counter electrode show a high level of specific capacity, its stability during cycling, the ability to rapidly accumulate and release the charge. For a cell in which the electrochemical system (–) Li4Ti5O12| 0.67M LiClO4 in PC + DME | Li3V2(PO4)3 (+) with a balance of active substances in a capacity of 1: 1 is fully realized, there is a sharp deterioration of electrochemical behavior from cycle to cycle during testing. The paper cites the arguments and experimental data disclosing the influence of the products of the secondary oxidation of 1,2-dimethoxyethane at the Li3V2(PO4)3 electrode on the functional behavior of the Li4Ti5O12-electrode as the main reason for the observed decrease in the battery prototypes characteristics. It is shown that overcoming the detected problem is possible by optimizing the balance of active materials in the prototype.


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