固态电解质中的聚合物复合体系研究进展

doi:10.11868/j.issn.1001-4381.2021.000442

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Abstract

Because of its light weight, flexibility, and good contact with electrode, solid polymer electrolyte (SPE) has become a potential material for the development of electrochemical devices with high energy density, high safety and high flexibility, and has been paid extensive attention in recent years. However, defects such as low ionic conductivity and poor mechanical properties have also become the problems that limit its further commercialization. It is possible to solve these problems by forming a composite system of polymers by means of crosslinking, blending, copolymerization, etc. Therefore, in this paper, the mechanism of ionic conductivity in polymers was briefly introduced in order to explain the strategies to solve the above problems from the point of principle. Then, the applications and modification strategies of a variety of polymer-based composite electrolytes in electrochemical devices in recent years were reviewed. Finally, the problems of basic research and practical application faced currently by the composite SPEs were discussed and the solutions to these problems were given. It is hoped that this review can provide ideas for the design and preparation of future composite SPEs.

Key words： solid electrolyte polymer composite structure property

Received: 10 May 2021 Published: 18 April 2022

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Corresponding Authors: Demei YU E-mail: dmyu@mail.xjtu.edu.cn

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	Changyi DONG
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Changyi DONG,Demei YU. Research progress of polymer composite system in solid electrolyte[J]. Journal of Materials Engineering, 2022, 50(4): 15-35.

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http://jme.biam.ac.cn/EN/10.11868/j.issn.1001-4381.2021.000442 OR http://jme.biam.ac.cn/EN/Y2022/V50/I4/15

Conductive mechanism of solid polymer electrolytes
(a)crystal vacancy diffusion model; (b)amorphous region diffusion model

Modification strategies and characterization results of some polymers

78]
">

Structure of solid-state battery with double-layer electrolyte^[78]

79]
">

Change plots of R_p (a) and R_ct (b) of GPEs with the storage time^[79]

80]; (b)ionic conductivity of polymer electrolyte KOH-PVA and TEAOH-PVA over time^[87]
">

Effects of different kinds of alkali salts on ion transport properties of PVA gel electrolytes
(a)effect of types and concentration changes in PVA gels on ion conductivity^[80]; (b)ionic conductivity of polymer electrolyte KOH-PVA and TEAOH-PVA over time^[87]

92]
(a)fresh state; (b)after 5 days; (c)after 10 days; (d)after 15 days
">

Comparison of the discharge curve of TEAOH-PVA gel and KOH-PVA gel at different storage time^[92]
(a)fresh state; (b)after 5 days; (c)after 10 days; (d)after 15 days

96]
(a)PVA-H₂SO₄ gel electrolyte; (b)PVA-H₃PO₄ gel electrolyte
">

Charge storage mechanism in two acid-PVA gel electrolytes^[96]
(a)PVA-H₂SO₄ gel electrolyte; (b)PVA-H₃PO₄ gel electrolyte

105]
">

Synthesis of PANa-cellulose hydrogel electrolyte from MBAA, acrylate (AA) and cellulose^[105]

107]
">

SEM image of cross section of hydrogel coated with PDMS elastomer^[107]

9]
">

Molecular structure of single ion conductive multiblock copolymers^[9]

126]; (b)single ion conductive polymers synthesized by Rohan et al^[127]
">

Design of organic and inorganic hybrid SICPE
(a)co-polymerization of sodium 4-styrenesulfonate and PEGMA from silica nanoparticles and lithiation^[126]; (b)single ion conductive polymers synthesized by Rohan et al^[127]

135]; (b)comparison of ionic conductivity of PVDF-based CPE with different sizes of LLZO^[137]; (c)molecular structure diagram of PVDF-HFP; (d)schematic illustration for synthesis of the three-dimensional semi-interpenetrating gel polymer electrolyte^[141]
">

Composite solid electrolyte composed of high dielectric polymers
(a)Raman spectra of PVDF-SPE and PVDF/LLZTO-CPE membranes^[135]; (b)comparison of ionic conductivity of PVDF-based CPE with different sizes of LLZO^[137]; (c)molecular structure diagram of PVDF-HFP; (d)schematic illustration for synthesis of the three-dimensional semi-interpenetrating gel polymer electrolyte^[141]

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