基于开尔文探针技术的磷酸铁锂表面势研究

doi:10.19964/j.issn.1006-4990.2022-0074

Abstract

Abstract:

Based on the novel surface characterization technology，Kelvin probe force microscope（KPFM） was used to study the surface potential of lithium iron phosphate in order to further study the dynamic behavior of lithium ions on the surface of lithium iron phosphate.The results showed that the work function of lithium iron phosphate film was 5.38 eV at room temperature，and its work function was gradually decreased with the increase of external temperature，and when the temperature reached 80 ℃，the work function of lithium iron phosphate was 4.69 eV.It represented that lithium iron phosphate at high temperature had good electron mobility.In addition，ex situ Kelvin probe detection found that lithium iron phosphate had different surface work functions under different voltage equilibrium states.When it was charged to 4.3 V，the work function of lithium iron phosphate was 4.91 eV，and when it was discharged to 2.5 V，the work function of material was stable at 5.01 eV.It could be seen that the work function of lithium iron phosphate was very sensitive to the amount of lithium ion on the surface.This study was to explore the lithium ion dynamic behavior on the surface of lithium iron phosphate from a new perspective of work function.It was hoped to provide a reference for the study of lithium removal process of other energy storage materials.

Key words: lithium-ion battery, lithium iron phosphate, surface work function

CLC Number:

TM912.9

YANG Wenyu,LIN Zhiya,FU Hong,YAN Wenyue,LIN Jianping,GUAN Guiqing. Study on surface potential of lithium iron phosphate based on kelvin probe technology[J]. Inorganic Chemicals Industry, 2022, 54(11): 65-70.

Figures/Tables 7

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Study on surface potential of lithium iron phosphate based on kelvin probe technology

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