A new electrochemical system with a negative electrode based on lithium pentatitanate Li 4 Ti 5 O 12 , a positive electrode based on the lithium-vanadium(III) phosphate Li 3 V 2 (PO 4) 3 , 0.67M lithium chlorate(VII) LiClO 4 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 Li 4 Ti 5 O 12 and Li 3 V 2 (PO 4) 3 when tested in the electrochemical cell with the 0.67M LiClO 4 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 (-) Li 4 Ti 5 O 12 | 0.67M LiClO 4 in PC + DME | Li 3 V 2 (PO 4) 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 Li 3 V 2 (PO 4) 3 electrode on the functional behavior of the Li 4 Ti 5 O 12-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.
A study of the porous structure and discharge characteristics of electrochemically impregnated nickel oxide electrodes based on nickelized graphitized felt «Voilocarb-22» is conducted. It is shown that the developed technology of nickel oxide electrodes fabrication that involves such operations as nickel plating of the substrate, electrochemical impregnation, electrode formation and pressing allows forming polydisperse structured electrode active material with pore sizes ranging from 0.01 µm to 100 µm. The electrochemical tests have shown that the mockup batteries with newly-developed nickel oxide electrodes based on nickelized carbon/graphite felt have surpassed all requirements of the international standard IEC 62259:2007.
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