Irreversible capacity and rate-capability properties of lithium-ion negative electrode based on graphite

Irreversible capacity and rate-capability properties of lithium-ion negative electrode based on graphite

Článek WoS

In this paper, the results of experimental work with doped graphite are presented and described. The graphite material plays major role among negative electrode materials used in lithium-ion batteries. Graphite behavior as an active material of negative electrode in lithium-ion cell was widely investigated and published. The one key characteristic property of graphite is the irreversible capacity losses. The irreversible capacity represents losses which occur in graphite negative electrode within initial charge-discharge cycles (process called cell formatting). This phenomenon is connected with lower negative electrode potential vs. lithium (Li/Li+) and the growth of Solid Electrolyte Interphase (SEI) layer. The SEI layer is important and necessary for proper operation of lithium-ion cell, on the other hand growth of SEI layer limits and lowering theoretical capacity of lithium-ion cell up to 40 %. As a possible way, how to balance these losses is to dope graphite material by lithium atoms before its using in lithium-ion cell. Suppressing of irreversible capacity losses at initial charge-discharge cycles is the main aim of our investigation.

In this paper, the results of experimental work with doped graphite are presented and described. The graphite material plays major role among negative electrode materials used in lithium-ion batteries. Graphite behavior as an active material of negative electrode in lithium-ion cell was widely investigated and published. The one key characteristic property of graphite is the irreversible capacity losses. The irreversible capacity represents losses which occur in graphite negative electrode within initial charge-discharge cycles (process called cell formatting). This phenomenon is connected with lower negative electrode potential vs. lithium (Li/Li+) and the growth of Solid Electrolyte Interphase (SEI) layer. The SEI layer is important and necessary for proper operation of lithium-ion cell, on the other hand growth of SEI layer limits and lowering theoretical capacity of lithium-ion cell up to 40 %. As a possible way, how to balance these losses is to dope graphite material by lithium atoms before its using in lithium-ion cell. Suppressing of irreversible capacity losses at initial charge-discharge cycles is the main aim of our investigation.

Lithium, Graphite, Irreversible capacity, Rate-Capability

Lithium, Graphite, Irreversible capacity, Rate-Capability

LIBICH, J.; MÁCA, J.; VONDRÁK, J.; ČECH, O.; SEDLAŘÍKOVÁ, M.

2018

06.12.2017

Elsevier

United Kingdom

2352-152X

Journal of Energy Storage

14

3

Nizozemsko

383

390

8

https://www.journals.elsevier.com/journal-of-energy-storage