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Solid electrolyte interface membrane-coated negative electrode material composite material, preparation method and use thereof

A solid electrolyte and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor thermal stability and poor safety performance, achieve suppression of expansion, high structural stability and thermal stability, and solve thermal problems. The effect of runaway problems

Inactive Publication Date: 2018-06-08
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention overcomes the problems of poor thermal stability and poor safety performance of existing lithium-ion batteries in use by coating a layer of alumina ceramic solid electrolyte interface film on the surface of the negative electrode material.

Method used

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  • Solid electrolyte interface membrane-coated negative electrode material composite material, preparation method and use thereof
  • Solid electrolyte interface membrane-coated negative electrode material composite material, preparation method and use thereof
  • Solid electrolyte interface membrane-coated negative electrode material composite material, preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] (1) Add a certain quality of aluminum nitrate nonahydrate and stabilizer TX-100 into an appropriate amount of deionized water, and continue to stir mechanically at 600rpm until the aluminum nitrate is dissolved. 2 / g~15m 2 / g flake artificial graphite powder to make it completely dispersed, the mass ratio of aluminum nitrate nonahydrate: TX-100: deionized water: flake artificial graphite is 1.9:2:7:5. The above mixed solution was heated in a water bath until the temperature of the internal reaction system was 75°C. Take a certain amount of urea, dissolve it in an appropriate amount of deionized water, and stir it with a glass rod to dissolve. During this process, the mass ratio of urea: deionized water is 6.1:10. Add the aqueous solution of urea into the above-mentioned mechanically stirred mixed solution by means of a peristaltic pump feeding, and then mechanically stir for 0.5h to mix evenly after the feeding is completed;

[0074] The temperature of the whole proce...

Embodiment 2

[0082] (1) Add a certain amount of aluminum chloride hexahydrate and sodium carboxymethyl cellulose into an appropriate amount of deionized water, stir and dissolve with a glass rod, and then add a median particle size of 10 μm to 20 μm under continuous mechanical stirring at a speed of 500 rpm. Surface area 1m 2 / g~15m 2 The quasi-spherical natural graphite powder of / g makes it completely dispersed, and the aluminum chloride hexahydrate added in this process: sodium carboxymethyl cellulose: deionized water: the mass ratio of natural graphite is: 0.5:5:7: 5. The above mixed solution was heated in a water bath until the temperature of the internal reaction system was 50°C. A certain amount of ammonia water (25wt.%) was dispersed in an appropriate amount of deionized water, stirred with a glass rod, and the mass ratio of ammonia water: deionized water in the process was 1.1:1. Use a peristaltic pump to add the above-mentioned ammonia solution to the above-mentioned mechanica...

Embodiment 3

[0087] (1) Add a certain amount of aluminum sulfate and TX-100 into an appropriate amount of deionized water, stir and dissolve, then add a medium particle size of 10 μm to 20 μm and a specific surface area of ​​1m under continuous mechanical stirring. 2 / g~15m 2 / g of spherical natural graphite powder to make it completely dispersed, the mass ratio of aluminum sulfate: TX-100: deionized water: graphite powder is 1:4:7:5. The above mixed solution was heated in a water bath until the temperature of the internal reaction system was 65°C. Take a certain amount of sodium hydroxide, dissolve it in an appropriate amount of deionized water, and stir to dissolve. During this process, the mass ratio of sodium hydroxide: deionized water is 0.24:1. Add the sodium hydroxide aqueous solution to the above-mentioned mechanically stirred mixed solution with a peristaltic pump, and then mechanically stir for 0.5h to mix evenly after the feeding is complete;

[0088] The temperature of the wh...

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Abstract

The invention relates to a solid electrolyte interface membrane (SEI-membrane)-coated negative electrode material composite material, a preparation method and a lithium ion battery adopting the composite material. The solid electrolyte interface membrane is a compact and uniform A1<2>O<3> ceramic membrane. The compact and uniformly-coated SEI membrane is fabricated on surface of the negative electrode material by a solid phase membrane formation method, a liquid phase membrane formation method or a chemical membrane formation method. The negative electrode material coated with the SEI membranehas relatively high structural stability and thermal stability, so that the lithium ion battery by taking the material as the negative electrode shows excellent cycle stability. The pass rate of no ignition and no explosion in an assembled NCM523 ternary flexibly-packaged lithium ion battery acupuncture experiment can reach 100%, so that the thermal runaway of the lithium ion batteries is suppressed effectively and the safety of the lithium ion batteries of short-circuit caused by extreme cases of puncturing and external force and the like can be improved. In addition, the preparation methodof the invention is simple, environmentally-friendly and low in cost, and suitable for large scale production.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and relates to a composite material of a negative electrode material coated with a solid electrolyte interface film, a preparation method and application thereof, in particular to a composite material of a negative electrode material covered with a solid electrolyte interface film and a preparation method thereof And a lithium-ion battery using the composite material. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices and power vehicles due to their advantages such as long cycle life, high working voltage, small self-discharge, no memory effect, and low environmental pollution. At present, in order to further improve the electrochemical performance of lithium-ion batteries with graphite as the negative electrode, such as energy density, cycle performance, and rate performance, the method of coating modification i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/133H01M10/0525
CPCH01M4/133H01M4/366H01M4/583H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 周成坤徐涛周海辉任建国黄友元岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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