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Cross-linked polymer-based all-solid-state electrolyte material and application of cross-linked polyoxyethylene ether

A technology of cross-linked polymer and electrolyte material, applied in the field of lithium battery materials, can solve the problems of inability to work above 60 ℃, poor battery safety performance, etc. Effect

Active Publication Date: 2014-01-08
王海斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the traditional electrolyte battery has poor safety performance and cannot work above 60°C, the invention provides a cross-linked polymer-based battery with relatively high conductivity, wide electrochemical window, and good compatibility with electrode materials. Solid electrolyte material, after the electrolyte material is made into an electrolyte membrane, the assembled battery has the characteristics of good high-temperature cycle stability, high charge-discharge specific capacity, and good retention rate

Method used

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  • Cross-linked polymer-based all-solid-state electrolyte material and application of cross-linked polyoxyethylene ether
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  • Cross-linked polymer-based all-solid-state electrolyte material and application of cross-linked polyoxyethylene ether

Examples

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Embodiment 1

[0038] Using 71.00 parts of cross-linked polymer with a polyoxyethylene chain average molecular weight of 650 on the structural unit as the polymer matrix, 18.50 parts of LiTFSI as lithium salt, and 10.50 parts of polyvinylidene fluoride as a modifier to prepare an electrolyte membrane, and the electrolyte Membrane assembly into LiFePO 4 / electrolyte / Li half-cell. The conductivity of the electrolyte membrane at room temperature is 3.0×10 -5 S / cm, the electrochemical window is 5.20V. Its LiFePO 4 The charge-discharge specific capacity of the half-battery can reach 87mAh / g at 0.3C at room temperature, and the capacity remains basically unchanged after 100 cycles.

Embodiment 2

[0040] Prepare the same polymer electrolyte membrane as in Example 1 and assemble it into LiFePO 4 / electrolyte / Li half-cell. The conductivity of the electrolyte membrane at 60°C is 2.4×10 -4 S / cm, the electrochemical window is 5.10V. LiFePO assembled using this electrolyte membrane 4 The initial charge-discharge specific capacity of the half-cell at 60°C at 0.5C can reach 140mAh / g, and after 100 cycles it is 132mAh / g, with a capacity retention rate of 94%. Electrolyte electrochemical window and battery cycle test results are attached figure 1 And attached figure 2 Shown: from figure 1 It can be seen that the electrochemical window of the electrolyte described in Example 2 at 60°C can reach 5.10V, that is, no decomposition will occur at a potential lower than 5.10V; figure 2 It can be seen that the battery prepared by using the electrolyte in Example 2 has good cycle performance at 60°C, and after 100 cycles, the capacity retention rate reaches more than 90%.

Embodiment 3

[0042] Prepare the same polymer electrolyte membrane as in Example 1 and assemble it into LiFePO 4 / electrolyte / Li half-cell. The conductivity of the electrolyte membrane at 80°C is 5.3×10 -4 S / cm, the electrochemical window is 5.03V. LiFePO assembled using this electrolyte membrane 4 The charge-discharge specific capacity of the half-battery can reach 150mAh / g at room temperature at 0.5C, and it can reach 138mAh / g after 100 cycles, with a capacity retention rate of 92%.

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Abstract

The invention discloses a cross-linked polymer-based all-solid-state electrolyte material and an application of cross-linked polyoxyethylene ether. The cross-linked polymer-based all-solid-state electrolyte material comprises cross-linked polyoxyethylene ether, lithium salt and a modifying agent. An electrolyte membrane prepared from the electrolyte material containing the cross-linked polyoxyethylene ether has relatively high conductivity and a wide electrochemical window; and an assembled half-cell has good high-temperature cycle performance, and the retention rate of the charge-discharge specific capacity of the half-cell is high.

Description

technical field [0001] The invention relates to the application of a cross-linked polymer-based all-solid-state electrolyte and cross-linked polyoxyethylene ether, which belongs to the field of lithium battery materials. Background technique [0002] Compared with traditional electrolytes, polymer electrolytes have the advantages of good high temperature stability, wide electrochemical window, high safety performance, and easy matching with high-voltage electrodes. They are more suitable for the next generation of high-performance lithium-ion batteries with large scale and high energy density. It has broad application prospects in electric vehicles, energy storage power stations and other fields. [0003] The polymer electrolyte is composed of a polymer and a lithium salt. The polymer is equivalent to a solid solvent, which plays the role of dissociating the lithium salt and conducting lithium ions, and the lithium salt plays the role of providing lithium ions. The study of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056
CPCY02E60/12H01M10/0525H01M10/0565Y02E60/10
Inventor 刘晋刘业翔徐俊毅
Owner 王海斌
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