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Solvothermal water-diethylene glycol synthesis of LiCoPO4 and effects of surface treatments on lithium battery performance

Solvothermal water-diethylene glycol synthesis of LiCoPO4 and effects of surface treatments on lithium battery performance
Solvothermal water-diethylene glycol synthesis of LiCoPO4 and effects of surface treatments on lithium battery performance
Olivine-structured LiCoPO4 is prepared via a facile solvothermal synthesis, using various ratios of water/diethylene glycol co-solvent, followed by thermal treatment under Ar, air, 5%H2/N2 or NH3. The diethylene glycol plays an important role in tailoring the particle size of LiCoPO4. An optimal ratio of water/diethylene glycol is identified as 1:6 (v/v), which produces a LiCoPO4 particle size of ~150 nm. The bare LiCoPO4 prepared after heating in Ar exhibits high initial discharge capacity of 147 mA h g-1 at 0.1 C with capacity retention of 70% after 40 cycles. This was attributed to the enhanced electronic conductivity of LiCoPO4 due to the presence of Co2P after firing under Ar. The effects of carbon, TiN and RuO2 coating were also examined. Contrary to other studies, it is found that the behaviour of the solvothermally synthesised LiCoPO4 samples produced here is not improved by the use of conductive coatings.
2046-2069
740-752
Zhang, Min
dfc78617-c6bf-40d9-a643-427ba8f2c24f
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d
Palgrave, Robert
6b26b39c-1da4-4937-beaa-c0848840b7bd
Palmer, Michael
635fbccf-5ad8-4aed-b495-93b84b6217fd
Soule, Samantha
f5b1ff97-bf20-4adb-ba1d-357254158d8f
Zhang, Min
dfc78617-c6bf-40d9-a643-427ba8f2c24f
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d
Palgrave, Robert
6b26b39c-1da4-4937-beaa-c0848840b7bd
Palmer, Michael
635fbccf-5ad8-4aed-b495-93b84b6217fd
Soule, Samantha
f5b1ff97-bf20-4adb-ba1d-357254158d8f

Zhang, Min, Garcia-Araez, Nuria, Hector, Andrew L., Owen, John R., Palgrave, Robert, Palmer, Michael and Soule, Samantha (2019) Solvothermal water-diethylene glycol synthesis of LiCoPO4 and effects of surface treatments on lithium battery performance. RSC Advances, 9 (2), 740-752. (doi:10.1039/c8ra08785g).

Record type: Article

Abstract

Olivine-structured LiCoPO4 is prepared via a facile solvothermal synthesis, using various ratios of water/diethylene glycol co-solvent, followed by thermal treatment under Ar, air, 5%H2/N2 or NH3. The diethylene glycol plays an important role in tailoring the particle size of LiCoPO4. An optimal ratio of water/diethylene glycol is identified as 1:6 (v/v), which produces a LiCoPO4 particle size of ~150 nm. The bare LiCoPO4 prepared after heating in Ar exhibits high initial discharge capacity of 147 mA h g-1 at 0.1 C with capacity retention of 70% after 40 cycles. This was attributed to the enhanced electronic conductivity of LiCoPO4 due to the presence of Co2P after firing under Ar. The effects of carbon, TiN and RuO2 coating were also examined. Contrary to other studies, it is found that the behaviour of the solvothermally synthesised LiCoPO4 samples produced here is not improved by the use of conductive coatings.

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LiCoPO4 paper 20180829 - Accepted Manuscript
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Accepted/In Press date: 15 December 2018
e-pub ahead of print date: 4 January 2019

Identifiers

Local EPrints ID: 427060
URI: http://eprints.soton.ac.uk/id/eprint/427060
ISSN: 2046-2069
PURE UUID: 1ad717df-dd32-4938-9fe8-76d393d53983
ORCID for Nuria Garcia-Araez: ORCID iD orcid.org/0000-0001-9095-2379
ORCID for Andrew L. Hector: ORCID iD orcid.org/0000-0002-9964-2163
ORCID for John R. Owen: ORCID iD orcid.org/0000-0002-4938-3693

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Date deposited: 21 Dec 2018 16:30
Last modified: 26 Nov 2021 05:32

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Contributors

Author: Min Zhang
Author: John R. Owen ORCID iD
Author: Robert Palgrave
Author: Michael Palmer
Author: Samantha Soule

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