Formation of size-dependent and conductive phase on lithium iron phosphate during carbon coating

Yulong Liu, Jian Liu, Jiajun Wang, Mohammad Norouzi Banis, Biwei Xiao, Andrew Lushington, Wei Xiao, Ruying Li, Tsun-Kong Sham, Guoxian Liang () and Xueliang Sun ()
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Yulong Liu: Western University
Jian Liu: Western University
Jiajun Wang: Western University
Mohammad Norouzi Banis: Western University
Biwei Xiao: Western University
Andrew Lushington: Western University
Wei Xiao: Western University
Ruying Li: Western University
Tsun-Kong Sham: Western University
Guoxian Liang: Johnson Matthey
Xueliang Sun: Western University

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Carbon coating is a commonly employed technique for improving the conductivity of active materials in lithium ion batteries. The carbon coating process involves pyrolysis of organic substance on lithium iron phosphate particles at elevated temperature to create a highly reducing atmosphere. This may trigger the formation of secondary phases in the active materials. Here, we observe a conductive phase during the carbon coating process of lithium iron phosphate and the phase content is size, temperature, and annealing atmosphere dependent. The formation of this phase is related to the reducing capability of the carbon coating process. This finding can guide us to control the phase composition of carbon-coated lithium iron phosphate and to tune its quality during the manufacturing process.

Date: 2018
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DOI: 10.1038/s41467-018-03324-7

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