Modified solid electrolyte membrane, preparation method thereof and lithium battery

A technology of solid electrolyte membrane and solid electrolyte, applied in the direction of non-aqueous electrolyte batteries, solid electrolytes, electrolytes, etc., can solve the problems of reducing battery energy density, increasing battery internal resistance, etc., and achieve good liquid absorption, uniform thickness, and ion conductivity high rate effect

Inactive Publication Date: 2019-03-19
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, coating the oxide on the diaphragm reduces the energy density of the battery and increases the internal resistance of the battery

Method used

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  • Modified solid electrolyte membrane, preparation method thereof and lithium battery
  • Modified solid electrolyte membrane, preparation method thereof and lithium battery
  • Modified solid electrolyte membrane, preparation method thereof and lithium battery

Examples

Experimental program
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preparation example Construction

[0033] The preparation method of the modified solid electrolyte membrane provided in this embodiment, its steps are as follows figure 2 shown, including the following steps:

[0034] Step 210, adding the dispersant, binder and solvent into the pre-mixing tank according to the required ratio, and completely dissolving to obtain the first mixture;

[0035] Wherein, the solvent is at least one of water, N-methylpyrrolidone, N,N-dimethylformamide, acetone and acetonitrile;

[0036]When the solvent is water, the binder is styrene-butadiene latex, styrene-acrylic latex, polyvinyl alcohol, polyacrylamide, polymethyl methacrylate-butyl acrylate, hydroxyethyl cellulose, methyl hydroxyethyl cellulose , sodium carboxymethylcellulose, and polyacrylamide; the dispersant is sodium polyacrylate, sodium dodecylbenzenesulfonate, sodium lauryl sulfate, sodium hexametaphosphate, polyacrylic acid, One or more of cetyltrimethylammonium bromide, polyethylene glycol, potassium polyacrylate, octyl...

Embodiment 1

[0046] This embodiment provides a modified solid electrolyte membrane, which includes a base membrane and a solid electrolyte layer composed of a coating slurry coated on one side of the base membrane, wherein the base membrane is a polypropylene porous membrane with a thickness of 10um. The surface coating method, the coating thickness is 3um, and the coating slurry used to form the solid electrolyte layer is: 20% composition, 80% deionized water according to the mass ratio; wherein, the composition is prepared according to the mass ratio: nano solid Electrolyte lithium titanium aluminum phosphate Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 Powder 97%, particle size D50 is 200nm, binder sodium carboxymethyl cellulose 1%, styrene-butadiene latex 1%, dispersant: sodium polyacrylate 1%, octylphenol polyoxyethylene 1%.

[0047] The modified solid electrolyte membrane in this example is prepared by the following method, which specifically includes steps:

[0048] (1) Add the binder sodium...

Embodiment 2

[0054] This embodiment provides a modified solid electrolyte ceramic membrane, which includes a base membrane and a solid electrolyte layer composed of a coating slurry coated on one side of the base membrane. The base film is a polypropylene porous film with a thickness of 12um. It is coated on one side with a coating thickness of 4um. The coating slurry used to form the solid electrolyte layer is: 20% of the composition, N-methylpyrrolidone 80%; wherein, the preparation of the composition is according to the mass ratio: nanometer solid electrolyte lithium titanium aluminum phosphate Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 Powder 96%, particle size D50 is 200nm. Binder: polyvinylidene fluoride 2%, dispersant: glyceryl stearate 2%.

[0055] The method for preparing the modified solid electrolyte membrane is the same as that in Example 1.

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Abstract

The invention discloses a modified solid electrolyte membrane, a preparation method thereof and a lithium battery. The modified solid electrolyte membrane comprises a basic membrane and a solid electrolyte layer. The solid electrolyte layer is formed by a coating slurry which is coated on the basic membrane or is coated on the basic membrane and even permeate into the basic membrane, a thickness ratio of a coating layer on the basic membrane to the basic membrane is 10:1-1:10, the thickness of the coating layer is in a range of from 1 micrometer to 10 micrometers, and the density of the coating layer is in a range of from 50% to 100%. The solid electrolyte layer is formed by a NAS I CON type solid electrolyte material, have practical size smaller than 1 micrometer and is specifically represented as Li1+xAxB2-x(PO4)3, wherein x is in a range of from 0 to 0.6, A is one or more of Al, Y, Ga, Cr, In, Fe, Se or La, B is one or more of Ti, Ge, Ta, Zr, Sn, Fe, V or hafnium element Hf, and after the solid electrolyte membrane is circularly formed, a photoelectronic energy spectrum of an X-ray of the solid electrolyte membrane has a peak between 685eV to 690eV.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a modified solid electrolyte membrane, a preparation method thereof and a lithium battery. Background technique [0002] Lithium-ion battery is a new type of secondary rechargeable battery. Because of its high working voltage, large capacity, long cycle life, and no pollution, it has been widely used in notebook computers, mobile phones and other equipment and power tools. In recent years, with the continuous development of new energy sources, the demand for secondary batteries is also increasing. Improving the overall safety and electrochemical performance of batteries is the focus of the current development of secondary batteries. The separator is an important part of the secondary battery, which affects the interface structure and internal impedance, and plays a vital role in the thermal stability, cycle performance, rate performance and safety performance of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1016H01M10/0562H01M10/0525
CPCH01M8/1016H01M10/0525H01M10/0562Y02E60/50Y02E60/10H01M2300/0068H01M2300/0094H01M10/052H01M10/056H01M50/449H01M50/489H01M50/431H01M50/403H01M50/497
Inventor 闫昭罗飞陶凌李泓
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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