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A solution-precursor synthesis of carbon-coated LiFePO4 for Li-ion cells

A solution-precursor synthesis of carbon-coated LiFePO4 for Li-ion cells
A solution-precursor synthesis of carbon-coated LiFePO4 for Li-ion cells
Carbon-coated, olivine-phase LiFePO4 suitable for lithium-ion batteries have been prepared via a novel, one-step, low-cost synthesis route from aqueous precursor solutions of Fe(NO3)(3), LiCH3COO, H3PO4, and sucrose. Sucrose additions up to a mole fraction of 25% were found to suppress crystallization of the salts during the first stages of pyrolysis, thereby reducing elemental segregation and facilitating the formation of the olivine structure below 500 degrees C in a single heating step. Sucrose also acted as a reducing agent and a source of carbon to form a conductive network in the active material during synthesis, leading to a higher capacity than materials in which sucrose was substituted with acetylene black. After additional treatment with sucrose at 700 degrees C, the material achieved a capacity of 162 mAh g(-1) at the C/14 rate and 158 mAh g(-1) at C/3.5 in the voltage range 2.0/4.5 V vs Li.
rechargeable lithium batteries, electrochemical performance, iron phosphates, electrode, conductivity, composites, stability, impact
0013-4651
A2376-A2382
Spong, Alan D.
836096b4-c6d6-4b3b-9e53-a74d3a368a94
Vitins, Girts
99d664d4-cac7-452a-96e0-768feea6eef2
Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d
Spong, Alan D.
836096b4-c6d6-4b3b-9e53-a74d3a368a94
Vitins, Girts
99d664d4-cac7-452a-96e0-768feea6eef2
Owen, John R.
067986ea-f3f3-4a83-bc87-7387cc5ac85d

Spong, Alan D., Vitins, Girts and Owen, John R. (2005) A solution-precursor synthesis of carbon-coated LiFePO4 for Li-ion cells. Journal of the Electrochemical Society, 152 (12), A2376-A2382. (doi:10.1149/1.2120427).

Record type: Article

Abstract

Carbon-coated, olivine-phase LiFePO4 suitable for lithium-ion batteries have been prepared via a novel, one-step, low-cost synthesis route from aqueous precursor solutions of Fe(NO3)(3), LiCH3COO, H3PO4, and sucrose. Sucrose additions up to a mole fraction of 25% were found to suppress crystallization of the salts during the first stages of pyrolysis, thereby reducing elemental segregation and facilitating the formation of the olivine structure below 500 degrees C in a single heating step. Sucrose also acted as a reducing agent and a source of carbon to form a conductive network in the active material during synthesis, leading to a higher capacity than materials in which sucrose was substituted with acetylene black. After additional treatment with sucrose at 700 degrees C, the material achieved a capacity of 162 mAh g(-1) at the C/14 rate and 158 mAh g(-1) at C/3.5 in the voltage range 2.0/4.5 V vs Li.

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More information

Published date: 2005
Keywords: rechargeable lithium batteries, electrochemical performance, iron phosphates, electrode, conductivity, composites, stability, impact

Identifiers

Local EPrints ID: 20914
URI: http://eprints.soton.ac.uk/id/eprint/20914
ISSN: 0013-4651
PURE UUID: 098ffe1d-a13e-408e-bde8-fcf5c3c73039
ORCID for John R. Owen: ORCID iD orcid.org/0000-0002-4938-3693

Catalogue record

Date deposited: 01 Mar 2006
Last modified: 03 Dec 2019 02:03

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Contributors

Author: Alan D. Spong
Author: Girts Vitins
Author: John R. Owen ORCID iD

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