Study of the Mechanism of Electrolyte Decomposition and Gas Formation during Operation of Lithium-Ion Batteries

Authors

  • N. E. Galushkin Laboratory of Electrochemical and Hydrogen Energy, Don State Technical University,147 Shevchenko Street, Town of Shakhty, Rostov Region, 346500, Russia.
  • N. N. Yazvinskaya Don State Technical University, 344000 Rostov-on-Don, Rostov Region, Russia.
  • M. S. Lipkin Laboratory of Electrochemical and Hydrogen Energy, Don State Technical University,147 Shevchenko Street, Town of Shakhty, Rostov Region, 346500, Russia.
  • D. N. Galushkin Laboratory of Electrochemical and Hydrogen Energy, Don State Technical University,147 Shevchenko Street, Town of Shakhty, Rostov Region, 346500, Russia.

DOI:

https://doi.org/10.9734/bpi/acst/v6/7363A

Keywords:

Lithium-ion batteries, electrolyte decomposition, potential-independent H2 release

Abstract

This paper is the first to prove the mechanism of decomposition of the standard electrolyte LP57 (1 M LiPF6 in EC:EMC, 3:7 by weight) and the release of gases in lithium-ion batteries during their operation, which quantitatively explains all known experimental results. It has been proven that the electrolyte decomposes with the release of CO and H2 gases. While the release of gas CO2 is associated with the occurrence of an additional chemical reaction between the released CO at the cathode (as a result of the decomposition of the electrolyte) with atomic lattice oxygen released from the cathode. Therefore, depending on the operating conditions of the battery (temperature and cutoff voltage), the ratio CO2/CO varies from 0.82 to 2.42. It has been proven that the accumulation of H2 in the anode graphite is the cause of its potential-independent release during battery cycling.

Published

2023-10-09

How to Cite

N. E. Galushkin, N. N. Yazvinskaya, M. S. Lipkin, & D. N. Galushkin. (2023). Study of the Mechanism of Electrolyte Decomposition and Gas Formation during Operation of Lithium-Ion Batteries. Advances and Challenges in Science and Technology Vol. 6, 67–104. https://doi.org/10.9734/bpi/acst/v6/7363A

Issue

Advances and Challenges in Science and Technology Vol. 6

Section

Chapters