Directional assist (0 1 0) plane growth in LiMnPO4 prepared by solvothermal method with polyols to enhance electrochemical performance

doi:10.1016/j.cjche.2020.10.027

Chinese Journal of Chemical Engineering ›› 2021, Vol. 36 ›› Issue (8): 181-189.DOI: 10.1016/j.cjche.2020.10.027

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Directional assist (0 1 0) plane growth in LiMnPO₄ prepared by solvothermal method with polyols to enhance electrochemical performance

Qian Xie¹, Jihua Zhu², Chengyun Wang³, Kaibin Fang¹, Wei Yang¹, Quanbing Liu⁴, Yali Wang¹, Shengzhou Chen¹

1 School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China;
2 Sunwoda Electronics Co., Ltd., Shenzhen 518107, China;
3 GAC Automotive Research & Development Center, Guangzhou 511434, China;
4 School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China

Received:2020-09-01 Revised:2020-10-16 Online:2021-09-30 Published:2021-08-28
Contact: Wei Yang, Quanbing Liu
Supported by:
The authors gratefully acknowledge the financial support from Natural Science Foundation of Guangdong Province (2018A030313423), Key Research and Development Program of Guangdong Province (2020B090919005) and Pearl River Science and Technology New Star Project (201806010039).

Directional assist (0 1 0) plane growth in LiMnPO₄ prepared by solvothermal method with polyols to enhance electrochemical performance

Qian Xie¹, Jihua Zhu², Chengyun Wang³, Kaibin Fang¹, Wei Yang¹, Quanbing Liu⁴, Yali Wang¹, Shengzhou Chen¹

1 School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China;
2 Sunwoda Electronics Co., Ltd., Shenzhen 518107, China;
3 GAC Automotive Research & Development Center, Guangzhou 511434, China;
4 School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China

通讯作者: Wei Yang, Quanbing Liu
基金资助:
The authors gratefully acknowledge the financial support from Natural Science Foundation of Guangdong Province (2018A030313423), Key Research and Development Program of Guangdong Province (2020B090919005) and Pearl River Science and Technology New Star Project (201806010039).

Abstract

Abstract: Phosphate material LiMnPO₄ is popular for its high energy density (697 W·h·kg^-1) and safety. When LiMnPO₄ crystal grows, the potential barrier along b and c axis is strong, which makes the crystal grow along b axis to form a one-dimensional chain structure. However, the main migration channel of lithium ions in olivine structure is plane (0 1 0). By shortening the growth in the direction of b axis and enhancing the diffusion along the directions of a and c, two-dimensional nanosheets that are more conducive to the migration of lithium ions are formed. The dosage of polyols is the key factor guiding the dispersion of the crystals to the (0 1 0) plane. X-ray diffraction (XRD), Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and other means are used to characterize the samples. After experiments, we found that when the ratio of polyol/water was 2:1, the morphology of the synthesized sample was 20-30 nm thick nanosheets, which had the best electrochemical performance. At 0.1C, the discharge specific capacity reaches 148.9 mA·h·g^-1, still reaches 144.3 mA·h·g^-1 at the 50th cycle. and there is still 112.5 mA·h·g^-1 under high rate (5C). This is thanks to the good dispersion of the material in the direction of the crystal plane (0 1 0). This can solve the problem of low conductivity and ionic mobility of phosphate materials.

Key words: LMnPO₄Polyols, Lithium-ion battery, Phosphate material, Crystal

摘要： Phosphate material LiMnPO₄ is popular for its high energy density (697 W·h·kg^-1) and safety. When LiMnPO₄ crystal grows, the potential barrier along b and c axis is strong, which makes the crystal grow along b axis to form a one-dimensional chain structure. However, the main migration channel of lithium ions in olivine structure is plane (0 1 0). By shortening the growth in the direction of b axis and enhancing the diffusion along the directions of a and c, two-dimensional nanosheets that are more conducive to the migration of lithium ions are formed. The dosage of polyols is the key factor guiding the dispersion of the crystals to the (0 1 0) plane. X-ray diffraction (XRD), Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and other means are used to characterize the samples. After experiments, we found that when the ratio of polyol/water was 2:1, the morphology of the synthesized sample was 20-30 nm thick nanosheets, which had the best electrochemical performance. At 0.1C, the discharge specific capacity reaches 148.9 mA·h·g^-1, still reaches 144.3 mA·h·g^-1 at the 50th cycle. and there is still 112.5 mA·h·g^-1 under high rate (5C). This is thanks to the good dispersion of the material in the direction of the crystal plane (0 1 0). This can solve the problem of low conductivity and ionic mobility of phosphate materials.

关键词: LMnPO₄Polyols, Lithium-ion battery, Phosphate material, Crystal

Qian Xie, Jihua Zhu, Chengyun Wang, Kaibin Fang, Wei Yang, Quanbing Liu, Yali Wang, Shengzhou Chen. Directional assist (0 1 0) plane growth in LiMnPO₄ prepared by solvothermal method with polyols to enhance electrochemical performance[J]. Chinese Journal of Chemical Engineering, 2021, 36(8): 181-189.

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Directional assist (0 1 0) plane growth in LiMnPO₄ prepared by solvothermal method with polyols to enhance electrochemical performance

Directional assist (0 1 0) plane growth in LiMnPO₄ prepared by solvothermal method with polyols to enhance electrochemical performance

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