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Dual cation- and anion-based redox process in lithium titanium oxysulfide thin film cathodes for all-solid-state lithium-ion batteries

Dual cation- and anion-based redox process in lithium titanium oxysulfide thin film cathodes for all-solid-state lithium-ion batteries
Dual cation- and anion-based redox process in lithium titanium oxysulfide thin film cathodes for all-solid-state lithium-ion batteries
A dual redox process involving Ti3+/Ti4+ cation species and S2-/(S2)2- anion species is highlighted in oxygenated lithium titanium sulfide thin film electrodes during lithium (de)insertion, leading to a high specific capacity. These cathodes for all-solid-state lithium-ion microbatteries are synthesized by sputtering of LiTiS2 targets prepared by different means. The limited oxygenation of the films that is induced during the sputtering process favors the occurrence of the S2-/(S2)2- redox process at the expense of the Ti3+/Ti4+ one during the battery operation, and influences its voltage profile. Finally, a perfect reversibility of both electrochemical processes is observed, whatever the initial film composition. All-solid-state lithium microbatteries using these amorphous lithiated titanium disulfide thin films and operated between 1.5-3.0 V/Li+/Li deliver a greater capacity (210-270 mAh g-1) than LiCoO2, with a perfect capacity retention (-0.0015 % cycle-1).
1944-8244
1-31
Dubois, Vincent
12f487bd-f08d-44df-8a9d-cc75bc854bb2
Pecquenard, Brigitte
ab937592-4839-4d77-a351-7a3ffd946003
Soule, Samantha
f5b1ff97-bf20-4adb-ba1d-357254158d8f
Martinez, Herve
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Le Cras, Frédéric
af46700a-6e6c-4d08-a441-60b9878f2b8a
Dubois, Vincent
12f487bd-f08d-44df-8a9d-cc75bc854bb2
Pecquenard, Brigitte
ab937592-4839-4d77-a351-7a3ffd946003
Soule, Samantha
f5b1ff97-bf20-4adb-ba1d-357254158d8f
Martinez, Herve
9a14b963-a958-4b67-a1a9-266d7b7cbc4f
Le Cras, Frédéric
af46700a-6e6c-4d08-a441-60b9878f2b8a

Dubois, Vincent, Pecquenard, Brigitte, Soule, Samantha, Martinez, Herve and Le Cras, Frédéric (2016) Dual cation- and anion-based redox process in lithium titanium oxysulfide thin film cathodes for all-solid-state lithium-ion batteries. ACS Applied Materials & Interfaces, 1-31. (doi:10.1021/acsami.6b11987).

Record type: Article

Abstract

A dual redox process involving Ti3+/Ti4+ cation species and S2-/(S2)2- anion species is highlighted in oxygenated lithium titanium sulfide thin film electrodes during lithium (de)insertion, leading to a high specific capacity. These cathodes for all-solid-state lithium-ion microbatteries are synthesized by sputtering of LiTiS2 targets prepared by different means. The limited oxygenation of the films that is induced during the sputtering process favors the occurrence of the S2-/(S2)2- redox process at the expense of the Ti3+/Ti4+ one during the battery operation, and influences its voltage profile. Finally, a perfect reversibility of both electrochemical processes is observed, whatever the initial film composition. All-solid-state lithium microbatteries using these amorphous lithiated titanium disulfide thin films and operated between 1.5-3.0 V/Li+/Li deliver a greater capacity (210-270 mAh g-1) than LiCoO2, with a perfect capacity retention (-0.0015 % cycle-1).

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e-pub ahead of print date: 21 December 2016
Organisations: Chemistry

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Local EPrints ID: 404292
URI: http://eprints.soton.ac.uk/id/eprint/404292
ISSN: 1944-8244
PURE UUID: 9c6be7c3-9ed9-4622-b090-0941b5b66692

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Date deposited: 05 Jan 2017 12:17
Last modified: 17 Dec 2019 06:28

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Contributors

Author: Vincent Dubois
Author: Brigitte Pecquenard
Author: Samantha Soule
Author: Herve Martinez
Author: Frédéric Le Cras

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