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A kind of composite material for lithium ion battery and its preparation method and lithium ion battery

A technology of lithium-ion batteries and composite materials, which is applied in the field of composite materials for lithium-ion batteries and its preparation, can solve problems such as not being effectively improved, performance not meeting industrial production and application, etc., to improve lithium ion conductivity and stability , good application potential, and the effect of improving compatibility

Active Publication Date: 2021-05-11
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most oxides mainly exist in the form of powder nanoparticles in the application of solid-state batteries, which have not been effectively improved, and the performance has not yet met the requirements of industrial production and application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0030] A composite material for a lithium ion battery, the composite material includes an oxide electrolyte and nano attapulgite, and the oxide electrolyte covers the nano attapulgite.

[0031] Further, the thickness of the oxide electrolyte coating layer is ≤20 μm, and the lithium ion conductivity of the oxide electrolyte coating layer is on the order of 10 -5 S / cm to 10 -3 S / cm. The rod crystals of the nano-attapulgite have a length of 100nm-50μm and a width of 10nm-120nm, and the nano-attapulgite has been commercialized.

[0032] Further, the oxide electrolyte is lithium phosphate, lithium titanate, lithium titanium phosphate, lithium titanium aluminum phosphate, lithium lanthanum titanate, lithium lanthanum tantalate, lithium germanium aluminum phosphate, lithium silicon phosphate, lithium aluminosilicate, three One or more of boron oxide doped lithium phosphate, lanthanum zirconium lithium oxygen, lanthanum zirconium aluminum lithium oxygen, niobium doped lithium lantha...

Embodiment 1

[0048] A preparation method for a composite material for a lithium ion battery, comprising the following steps:

[0049] Step 1: In terms of molar parts, 140.00 parts of lithium nitrate, 420.00 parts of phosphoric acid, and 280.00 parts of titanium sulfate are configured into a mixed aqueous solution, and citric acid and 12.4 parts by mass of nano-attapulgite are added to the mixed aqueous solution, wherein the metal cation and lemon The molar ratio of the acid is 1:1.2, stir evenly and add ammonia water to keep the pH value of the solution at 7, continue to stir until a gel is formed, heat to 60°C and perform vacuum treatment, and the mixed system is obtained after the aqueous solution is completely volatilized. The mixed system was microwaved at 180°C for 2 hours, cooled to room temperature, washed with deionized water, and vacuum-dried at 60°C for 12 hours to obtain the precursor powder A system;

[0050] Step 2: Heat the precursor powder A system to 400°C for 0.5h to elimi...

Embodiment 2

[0056] A preparation method for a composite material for a lithium ion battery, comprising the following steps:

[0057] Step 1. In molar parts, 140.00 parts of lithium sulfate, 60.00 parts of lanthanum nitrate, 35.00 parts of zirconium chloride, and 5.00 parts of niobium pentachloride are configured into a mixed aqueous solution, and citric acid and 4.2 parts by mass of nano Attapulgite, wherein the molar ratio of metal cations to citric acid is 1:1.6, stir evenly and add ammonia water to keep the pH value of the solution at 7, continue stirring until a gel is formed, heat to 70°C and perform vacuum treatment, After the aqueous solution is completely volatilized, a mixed system is obtained. The mixed system is microwaved at 200°C for 4 hours, cooled to room temperature, washed with ethanol, and vacuum-dried at 90°C for 24 hours to obtain the precursor powder A system;

[0058] Step 2: Heat the precursor powder A system to 490°C for 0.9 hours to eliminate residual organic matt...

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Abstract

The invention provides a composite material for a lithium ion battery, a preparation method thereof, and a lithium ion battery, which belong to the technical field of lithium ion batteries, and the specific scheme is as follows: a composite material for a lithium ion battery, including an oxide electrolyte and nano attapulgite, The oxide electrolyte coats nano attapulgite. The thickness of the oxide electrolyte coating layer is less than or equal to 20 μm, and the rod crystals of the nano attapulgite are 100 nm to 50 μm in length and 10 nm to 120 nm in width. The present invention also provides a preparation method of the above-mentioned composite material and a lithium ion battery containing the composite material. The attapulgite coated with the oxide electrolyte has a fast lithium ion transmission channel with a rod-like structure at the nanometer level, which can improve the transmission of lithium ions , has good lithium ion conductivity and excellent mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a composite material for lithium ion batteries, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in digital products and power supplies due to their high energy density and long service life. However, the electrolyte of liquid lithium-ion batteries has shortcomings such as volatile and low flash point, and there may be safety problems such as leakage, fire, and explosion during use. At the same time, under the background of increasing energy density requirements, 350Wh / kg may be close to the limit of liquid lithium-ion batteries, and the bottleneck of energy density is becoming increasingly prominent. The safety performance and energy density of liquid lithium-ion batteries limit its application range. [0003] Solid-state batteries have better safety and higher energy density, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10B82Y30/00H01M10/0525H01M4/62H01M10/0562H01M2300/0071C01B25/45H01M2300/0068H01M4/13C01G35/006C01G25/006C01P2002/54B82Y40/00H01M4/0407H01M4/364
Inventor 唐伟超李素丽赵伟袁号李俊义徐延铭左朋建
Owner ZHUHAI COSMX BATTERY CO LTD
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