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LiFePO4 battery material for the production of lithium from brines: Effect of brine composition and benefits of dilution

LiFePO4 battery material for the production of lithium from brines: Effect of brine composition and benefits of dilution
LiFePO4 battery material for the production of lithium from brines: Effect of brine composition and benefits of dilution
Lithium battery materials can be advantageously used for the selective sequestration of lithium ions from natural resources, which contain other cations in high excess. However, for practical applications, this new approach for lithium production requires the battery host materials to be stable over many cycles while retaining the high lithium selectivity. Here, a nearly symmetrical cell design was employed to show that LiFePO4 shows good capacity retention with cycling in artificial lithium brines representative of brines from Chile, Bolivia and Argentina. A quantitative correlation was identified between brine viscosity and capacity degradation, and for the first time it was demonstrated that the dilution of viscous brines with water significantly enhanced capacity retention and rate capability. The electrochemical and X-ray diffraction characterisation of the cycled electrodes also showed that the high lithium selectivity was preserved with cycling. Raman spectra of the cycled electrodes showed no signs of degradation of the carbon coating of LiFePO4, while scanning electron microscopy images showed signs of particle cracking, thus pointing towards interfacial reactions as the cause of capacity degradation.
aqueous lithium-ion batteries, brine, electrochemistry, lithium, lithium sequestration
1864-5631
Perez rodriguez, Sara
13cf3679-8e13-41ee-96a9-d71f776c430c
Fitch, Samuel
6e21c66c-99c4-4b1b-b8ff-043a0cc2e884
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Perez rodriguez, Sara
13cf3679-8e13-41ee-96a9-d71f776c430c
Fitch, Samuel
6e21c66c-99c4-4b1b-b8ff-043a0cc2e884
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37

Perez rodriguez, Sara, Fitch, Samuel, Bartlett, Philip N. and Garcia-Araez, Nuria (2021) LiFePO4 battery material for the production of lithium from brines: Effect of brine composition and benefits of dilution. ChemSusChem. (doi:10.1002/cssc.202102182).

Record type: Article

Abstract

Lithium battery materials can be advantageously used for the selective sequestration of lithium ions from natural resources, which contain other cations in high excess. However, for practical applications, this new approach for lithium production requires the battery host materials to be stable over many cycles while retaining the high lithium selectivity. Here, a nearly symmetrical cell design was employed to show that LiFePO4 shows good capacity retention with cycling in artificial lithium brines representative of brines from Chile, Bolivia and Argentina. A quantitative correlation was identified between brine viscosity and capacity degradation, and for the first time it was demonstrated that the dilution of viscous brines with water significantly enhanced capacity retention and rate capability. The electrochemical and X-ray diffraction characterisation of the cycled electrodes also showed that the high lithium selectivity was preserved with cycling. Raman spectra of the cycled electrodes showed no signs of degradation of the carbon coating of LiFePO4, while scanning electron microscopy images showed signs of particle cracking, thus pointing towards interfacial reactions as the cause of capacity degradation.

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Published date: 3 November 2021
Keywords: aqueous lithium-ion batteries, brine, electrochemistry, lithium, lithium sequestration

Identifiers

Local EPrints ID: 452659
URI: http://eprints.soton.ac.uk/id/eprint/452659
ISSN: 1864-5631
PURE UUID: c9901696-db78-4fb7-8fb8-56a37b60a76d
ORCID for Philip N. Bartlett: ORCID iD orcid.org/0000-0002-7300-6900
ORCID for Nuria Garcia-Araez: ORCID iD orcid.org/0000-0001-9095-2379

Catalogue record

Date deposited: 11 Dec 2021 11:31
Last modified: 28 Apr 2022 02:08

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Author: Sara Perez rodriguez
Author: Samuel Fitch

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