Titanium phosphate composite material and preparation method and application thereof

A composite material, titanium phosphate technology, applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of material waste, air pollution, wall hanging, etc., and achieve simple process, easy operation, and convenient post-processing Effect

Active Publication Date: 2020-10-09
NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low-cost LiTi in the solid phase and quasi-solid phase using titanium oxide as the titanium source 2 (PO 4 ) 3 The negative electrode material preparation process usually uses wet ball milling to realize the mixing of raw materials. The post-treatment process of this method, such as dry spray granulation, etc., due to the problems of raw material hanging on the wall and overflowing with high-temperature gas, not only wastes materials, but also causes air pollution. Pollution, while the recycling performance of the obtained materials still has great challenges

Method used

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  • Titanium phosphate composite material and preparation method and application thereof
  • Titanium phosphate composite material and preparation method and application thereof
  • Titanium phosphate composite material and preparation method and application thereof

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preparation example Construction

[0098] The preparation of embodiment 1 carbon / titanium phosphate composite material

[0099] Step A: After weighing the lithium source, titanium source, phosphorus source, and carbon source in proportion, place them in a ball mill tank for full ball milling, and obtain material A after ball milling and mixing;

[0100] Among them, the lithium source, titanium source, phosphorus source, carbon source and the amount used are: lithium carbonate 7.4g, titanium dioxide 32.0g, ammonium dihydrogen phosphate 69.0g, sucrose 22.0g;

[0101] The milling time is 3 hours, the rotation speed is 200r / min, and the ball-to-material ratio is 7:1.

[0102] Step B: Add additive aqueous solution to material A, and then stir for a long time to make it fully mixed, and obtain pasty material B after mixing;

[0103] Wherein, the additive used is CMC, the mass concentration of its aqueous solution is 1%, the total mass of the aqueous solution is 30 g, and the stirring time is 3 hours.

[0104] Step ...

Embodiment 1

[0116] Embodiment 1 Half-cell assembly:

[0117] Half-cell structure composition

[0118] Electrolyte: 2M lithium sulfate (Li 2 SO 4 ) aqueous solution

[0119]Diaphragm: glass fiber filter paper (porosity below 1 micron, thickness about 260 microns)

[0120] Negative electrode: activated carbon cloth

[0121] Positive electrode: active material is carbon / titanium phosphate composite material

[0122] Positive electrode preparation process: Add the active material, conductive agent SP, and binder PTFE into the ethanol solution at a mass ratio of 7:2:1, mix and stir to form a slurry, coat it on the stainless steel mesh, and then dry it in vacuum. The electrode area is about 1.5cm 2 , the areal density of the active substance is about 1-2 mg cm -2 .

[0123] The battery used is a CR2032 button battery.

[0124] Wherein, the positive active material is denoted as half-cell 1 by the half-cell provided by embodiment I; the half-cell provided by embodiment II is denoted as ...

Embodiment 2

[0125] Example 2 full battery assembly:

[0126] Full battery structure

[0127] Electrolyte: lithium sulfate (Li 2 SO 4 ) saturated aqueous solution

[0128] Diaphragm: glass fiber filter paper (porosity below 1 micron, thickness about 260 microns)

[0129] Negative electrode active material: carbon / titanium phosphate composite material

[0130] Positive electrode active material: lithium manganate

[0131] The production process of the negative electrode sheet: the active material, the conductive agent SP, and the binder PTFE are mixed in an ethanol solution in a mass ratio of 7:2:1 to form a slurry, coated on a stainless steel mesh, and then vacuum-dried. The electrode area is about 1.5cm 2 , the areal density of the active substance is about 1-2 mg cm -2 .

[0132] The production process of the positive electrode sheet: the active material, the conductive agent SP, and the binder PTFE are mixed in an ethanol solution in a mass ratio of 8:1:1 to form a slurry, coate...

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Abstract

The invention discloses a titanium phosphate composite material and a preparation method and application thereof. The method comprises the steps of: enabling a lithium source, a titanium source, a phosphorus source and a carbon source to be subjected to dry ball milling I, and obtaining mixed powder I; mixing the mixed powder I with an additive aqueous solution, and drying to obtain a mixed material; carrying out dry ball milling II on the mixed material to obtain mixed powder II; and sintering the mixed powder II to obtain the carbon/titanium phosphate composite material. The method is simplein process and easy to operate, uniform dispersion of the raw materials during mixing can be guaranteed through dispersion of the additive aqueous solution in the method, the hardness of dried material particles can be reduced, and the whole preparation process is green, environmentally friendly and free of pollution; and when the titanium phosphate composite material prepared by adopting the method is used as a negative electrode of an aqueous lithium ion battery, the specific capacity of a half battery is close to 88mAh/g, and obvious attenuation is avoided after 100 cycles.

Description

technical field [0001] The application relates to a titanium phosphate composite material and its preparation method and application, belonging to the field of lithium ion batteries. Background technique [0002] Organic lithium-ion batteries have been widely used in the field of portable power supplies and power batteries due to their high open circuit voltage, high energy density, long cycle life and low self-discharge rate. However, when organic lithium-ion batteries are applied to megawatt-scale large-scale energy storage systems, the use of a large amount of toxic and flammable organic electrolytes greatly reduces the safety of energy storage systems. The use of solid-state electrolytes can improve the safety of batteries, but it is difficult to meet the needs of large-scale energy storage systems for high power and fast response. The power performance of the aqueous battery is even better. Aqueous lithium-ion batteries combine the characteristics of ion-deintercalati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/02H01M10/36
CPCH01M4/5825H01M4/628H01M4/625H01M4/02H01M10/36H01M2004/028H01M2004/021H01M2004/027Y02E60/10
Inventor 张旭锋吴志连李书顶王敏刚李忆非王耀国
Owner NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST
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