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Method for improving solid-state battery interface stability by polymer electrolyte

A polymer, solid electrolyte technology, applied in the field of lithium germanium phosphate, lithium ion batteries, can solve the problems of low load of electrode active material, volume change of electrode material, poor cycle stability, etc., to avoid lithium loss, high air stability, The effect of improving compatibility

Inactive Publication Date: 2019-09-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the development of solid-state batteries with superior performance still faces many scientific and technical challenges: for example, the volume change of electrode materials, large interface (electrode / electrolyte) resistance, low loading of electrode active materials, poor cycle stability, and low safety performance, etc.

Method used

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  • Method for improving solid-state battery interface stability by polymer electrolyte
  • Method for improving solid-state battery interface stability by polymer electrolyte
  • Method for improving solid-state battery interface stability by polymer electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0040] According to the characteristics of the aqueous solution method, lithium hydroxide monohydrate, aluminum hydroxide, germanium dioxide, and ammonium dihydrogen phosphate are preferably used as raw materials for preparing LAGP. According to Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 Stoichiometric molar ratio Weigh lithium hydroxide monohydrate (5% to 15% in excess), aluminum hydroxide, germanium dioxide, ammonium dihydrogen phosphate (2% in excess), dissolve in water and stir evenly with a magnetic stirrer. After the dispersion is uniform, a certain amount of 28% dilute ammonia water is added dropwise to the mixed liquid to adjust the pH to a strong alkalinity (above 12). After the reaction is complete, the solvent is evaporated by heating in a sand bath and completely dried to obtain crystals. As the solvent evaporated, white crystals were obtained. Fully grind to obtain a white powder, place it in an alumina porcelain boat, and dry it in a blast drying oven for 6 hours to fur...

Embodiment 2

[0042] The morphology and particle size distribution of the solid electrolyte material were observed under a scanning electron microscope. figure 2 The experimental results given show that the particle size distribution is uniform, and the particles are smaller and more uniform than the solid-phase method.

Embodiment 3

[0044] The conductivity test of inorganic solid electrolytes is generally carried out in the form of a blocking cell, and metals such as Au or Ag are used as blocking electrodes on both ends of the ceramic sheet for testing, because Au has a negative effect on Li + It has a certain blocking effect, so it presents an obvious capacitive reactance arc in the low frequency region of the impedance spectrum. The prepared ceramic sheets were polished with different sandpapers, and after the surface of the LAGP ceramic sheets was plated with gold, the AC impedance test was carried out on the LAGP ceramic sheets. Using EIS AC impedance spectroscopy for testing. The frequency range is 10Hz ~ 1MHz, and the test temperature is room temperature. image 3 is the AC impedance spectrum of the LAGP ceramic sheet, according to the formula (d: thickness of ceramic sheet, cm; R: total impedance of ceramic sheet, Ω; S: cross-sectional area of ​​ceramic sheet, cm -2 ) can calculate its ion cond...

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Abstract

A method for improving solid-state battery interface stability by a polymer electrolyte belongs to the technical field of solid batteries. A prepared hierarchical porous polymer electrolyte film is used as a buffer layer material and is placed between an electrode material and a solid-state electrolyte to form favorable contact with a positive electrode material, an electrolyte material and metallithium, the interface impedance is effectively reduced, direct contact reaction between the solid-state electrolyte and the metal lithium can be reduced, and the all-solid-state battery has relatively good cycle stability.

Description

technical field [0001] The invention relates to a lithium germanium phosphate doped with metal aluminum and a lithium ion battery technology in which the material is combined with a gel polymer electrolyte PVDF-HFP. The invention uses aluminum-doped lithium germanium phosphate as a solid electrolyte and the polymer electrolyte prepared above as a buffer layer to construct a lithium all-solid or quasi-solid ion battery, which belongs to the technical field of solid batteries. Background technique [0002] Entering the 21st century, human society is developing at an unprecedented speed. While enjoying many benefits of advanced civilization, human beings have to face energy and environmental crises such as the depletion of fossil fuel resources and the increasingly obvious global greenhouse effect. Man must completely change the pattern of energy consumption and vigorously develop renewable and clean energy. At the same time, high-efficiency energy storage devices—lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/0525H01M10/058H01M4/13
CPCH01M4/13H01M10/0525H01M10/0562H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 曹达鹏陈子豪卢侠石元盛
Owner BEIJING UNIV OF CHEM TECH
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