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Fast-ionic conductor Li2.64(Sc0.9Ti0.1)2(PO4)3 doped PVDF-HFP hybrid gel-electrolyte for lithium ion batteries

适用于锂离子电池的新型复合快离子导体Li2.64(Sc0.9Ti0.1)2(PO4)3聚合物 PVDF-HFP基凝胶电解质

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Abstract

With increasing demand on energy density of lithium-ion battery, wide electrochemical window and safety performance are the crucial request for next generation electrolyte. Gel-electrolyte as a pioneer for electrolyte solidization development aims to solve the safety and electrochemical window problems. However, low ionic conductivity and poor physical performance prohibit its further application. Herein, a fast-ionic conductor (Li2.64(Sc0.9Ti0.1)2(PO4)3) (LSTP) was added into poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) base gel-electrolyte to enhance mechanical properties and ionic conductivity. Evidences reveal that LSTP was able to weaken interforce between polymer chains, which increased the ionic conductibility and decreased interface resistance during the cycling significantly. The obtained LiFePO4/hybrid gel-electrolyte/Li-metal coin cell exhibited excellent rate capacity (145 mA·h/g at 1C, 95 mA·h/g at 3C, 28 °C) which presented a potential that can be comparable with commercialized liquid electrolyte system.

摘要

随着锂离子电池对能量密度要求的不断提高,更宽的电化学窗口和更高的安全性能将是下一代 电解质发展的重要方向。凝胶电解质作为电解质固态化发展研究的过渡阶段,在解决安全性问题、拓 宽电化学窗口等方面有着良好的应用前景。然而,较低的离子电导率和较差的力学性能阻碍了凝胶电 解质的进一步应用。为此,将一种快离子导体Li2.64(Sc0.9Ti0.1)2(PO4)3(LSTP)添加到聚偏氟乙烯-六氟丙烯 基(PVDF-HFP)凝胶电解质中,以提高其力学性能和离子导电性。结果表明,LSTP能够削弱聚合物链 间的相互作用力,加强链的热振动,显著提高离子导电性,降低循环过程中的界面电阻。所制备的混 合凝胶电解质锂金属电池具有优异的倍率容量(在28 °C时1C下为145 mA·h/g,3C下为95 mA·h/g),展 现出了可与商品化液体电解质体系相媲美的潜力。

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Author notes

  1. WANG Zhen-yu and LI Cong contributed equally to this work.

Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Zhen-yu Wang  (王振宇), Cong Li  (李聪), Ying-de Huang  (黄英德), Zhen-jiang He  (贺振江) & Jun-chao Zheng  (郑俊超)

  2. National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous Metals, Central South University, Changsha, 410083, China

    Zhen-yu Wang  (王振宇), Cong Li  (李聪), Ying-de Huang  (黄英德), Zhen-jiang He  (贺振江) & Jun-chao Zheng  (郑俊超)

  3. Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha, 410083, China

    Zhen-yu Wang  (王振宇), Cong Li  (李聪), Ying-de Huang  (黄英德), Zhen-jiang He  (贺振江) & Jun-chao Zheng  (郑俊超)

  4. School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, Queensland, 4001, Australia

    Cheng Yan  (闫澄)

  5. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China

    Jing Mao  (毛景)

  6. College of Chemistry, Tianjin Normal University, Tianjin, 300387, China

    Ke-hua Dai  (代克化)

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  1. Zhen-yu Wang  (王振宇)
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Contributions

ZHENG Jun-chao and HE Zhen-jiang provided the concept and edited the draft of manuscript. LI Cong conducted the literature review, carried out the experiment tests and collected data. WANG Zhen-yu analyzed the measured data and wrote the first draft of the manuscript. HUANG Ying-de provided the material synthesis technical support. YAN Cheng, MAO Jing and DAI Ke-hua edited the draft of manuscript. All authors replied to reviewers’ comments and revised the final version.

Corresponding author

Correspondence to Jun-chao Zheng  (郑俊超).

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Conflict of interest

WANG Zhen-yu, LI Cong, HUANG Ying-de, HE Zhen-jiang, YAN Cheng, MAO Jing, DAI Ke-hua and ZHENG Jun-chao declare that they have no conflict of interest.

Foundation item: Projects(51974368, 51774333) supported by the National Natural Science Foundation of China; Project(2020JJ2048) supported by the Hunan Provincial Natural Science Foundation of China

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Wang, Zy., Li, C., Huang, Yd. et al. Fast-ionic conductor Li2.64(Sc0.9Ti0.1)2(PO4)3 doped PVDF-HFP hybrid gel-electrolyte for lithium ion batteries. J. Cent. South Univ. 29, 2980–2990 (2022). https://doi.org/10.1007/s11771-022-5128-0

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  • DOI: https://doi.org/10.1007/s11771-022-5128-0

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