Issue 7, 2015

Doping-induced memory effect in Li-ion batteries: the case of Al-doped Li4Ti5O12

Abstract

In Li-ion batteries (LIBs), a memory effect has been revealed in two-phase electrode materials such as olivine LiFePO4 and anatase TiO2, which complicates the two-phase transition and influences the estimation of the state of charge. Practical electrode materials are usually optimized by the element doping strategy, however, its impact on the memory effect has not been reported yet. Here we firstly present the doping-induced memory effect in LIBs. Pristine Li4Ti5O12 is free from the memory effect, while a distinct memory effect could be induced by Al-doping. After being discharged to a lower cutoff potential, Al-doped Li4Ti5O12 exhibits poorer electrochemical kinetics, delivering a larger overpotential during the charging process. This dependence of the overpotential on the discharging cutoff leads to the memory effect in Al-doped Li4Ti5O12. Our discovery emphasizes the impact of element doping on the memory effect of electrode materials, and thus has implications for battery design.

Graphical abstract: Doping-induced memory effect in Li-ion batteries: the case of Al-doped Li4Ti5O12

Supplementary files

Article information

Article type
Edge Article
Submitted
04 2 2015
Accepted
17 4 2015
First published
17 4 2015
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY license

Chem. Sci., 2015,6, 4066-4070

Author version available

Doping-induced memory effect in Li-ion batteries: the case of Al-doped Li4Ti5O12

D. Li, Y. Sun, X. Liu, R. Peng and H. Zhou, Chem. Sci., 2015, 6, 4066 DOI: 10.1039/C5SC00429B

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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