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Electrode additive, preparation method thereof and positive plate

An additive and electrode technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems affecting battery cycle performance and rate performance, low conductivity of positive electrode, etc., achieve excellent electron transfer efficiency, increase transfer rate, Efficient effect

Pending Publication Date: 2022-06-21
SHENZHEN DYNANONIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this application is to provide an electrode additive and its preparation method, as well as a positive electrode sheet, which aims to solve the problem of low conductivity of the positive electrode of the existing lithium-ion battery, which affects the cycle performance and rate performance of the battery

Method used

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  • Electrode additive, preparation method thereof and positive plate
  • Electrode additive, preparation method thereof and positive plate
  • Electrode additive, preparation method thereof and positive plate

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preparation example Construction

[0025] A first aspect of the embodiments of the present application provides a method for preparing an electrode additive, comprising the following steps:

[0026] S10. After mixing the titanium source, aluminum source, phosphate, lithium source, acidic complexing agent, lye and alcohol solvent to form a sol, drying to obtain a titanium aluminum lithium phosphate precursor;

[0027] S20. After the first sintering treatment is performed on the titanium aluminum lithium phosphate precursor under an inert atmosphere, the second sintering treatment is performed in a mixed atmosphere containing oxygen to obtain an electrode additive; the electrode additive includes a porous titanium aluminum lithium phosphate inner core, The carbon material filled in the pores of the lithium titanium aluminum phosphate core, and the carbon shell layer coated on the outer surface of the lithium titanium aluminum phosphate core.

[0028] In the preparation method of the electrode additive provided in...

Embodiment 1

[0060] An electrode additive, the preparation of which comprises the steps:

[0061] ①According to Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 The stoichiometric ratio of aluminum nitrate, lithium nitrate and ammonium dihydrogen phosphate was weighed, and the total metal cation (Li + , Al 3+ , Ti 4+ ) citric acid with a molar ratio of 2:1, completely soluble in water. To the solution, add tetrabutyl titanate in a stoichiometric ratio, and stir for 3h until it is completely uniform. Add ammonia water dropwise to the solution to adjust pH to 5, then add ethylene glycol with a molar ratio of 1:1 to citric acid, stir and mix evenly. The gel was aged by rotary evaporation at 80°C for 10 h, and then the solvent was evaporated in a drying oven at 100°C to form a dry gel.

[0062] ②Crush the xerogel into powder and then sinter it in a tube furnace, protected by an argon atmosphere, with a flow rate of 200mL / min, heated to 550°C for 1 h at 5°C / min, and then continued to heat up to 850°C at...

Embodiment 2

[0064] An electrode additive, the preparation of which comprises the steps:

[0065] ①According to Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3 The stoichiometric ratio of aluminum nitrate, lithium nitrate and ammonium dihydrogen phosphate was weighed, and the total metal cation (Li + , Al 3+ , Ti 4+ ) citric acid with a molar ratio of 2:1, completely soluble in water. To the solution, add tetrabutyl titanate in a stoichiometric ratio, and stir for 3h until it is completely uniform. Add ammonia water dropwise to the solution to adjust pH to 5, then add ethylene glycol with a molar ratio of 1:1 to citric acid, stir and mix evenly. The gel was aged by rotary evaporation at 80°C for 10 h, and then the solvent was evaporated in a drying oven at 100°C to form a dry gel.

[0066] ②Crush the xerogel into powder and then sinter it in a tube furnace, protected by an argon atmosphere, with a flow rate of 200mL / min, heated to 550°C for 1 h at 5°C / min, and then continued to heat up to 850°C at...

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to an electrode additive, a preparation method thereof and a positive plate. The preparation method of the electrode additive comprises the following steps: mixing a titanium source, an aluminum source, phosphate radicals, a lithium source, an acidic complexing agent, alkali liquor and an alcohol solvent to form sol, and drying to obtain a lithium titanium aluminum phosphate precursor; carrying out first sintering treatment on the lithium titanium aluminum phosphate precursor in an inert atmosphere, and then carrying out second sintering treatment in a mixed atmosphere containing oxygen to obtain an electrode additive; the electrode additive comprises a porous titanium-aluminum-lithium phosphate core, a carbon material filled in pores of the titanium-aluminum-lithium phosphate core, and a carbon shell layer coated on the outer surface of the titanium-aluminum-lithium phosphate core. According to the preparation method of the electrode additive, the carbon material filling and coating layer is generated in situ while the lithium titanium aluminum phosphate is generated, the process is simple and convenient, the efficiency is high, and the preparation method is suitable for industrial large-scale production and application.

Description

technical field [0001] The application belongs to the technical field of batteries, and in particular relates to an electrode additive and a preparation method thereof, and a positive electrode sheet. Background technique [0002] As a green and environmentally friendly new energy source, lithium-ion batteries have the advantages of good reliability, high safety, small size and light weight. At present, they have been widely used in digital products, electric vehicles, military products and other fields. With the demand and emphasis on new energy applications in all walks of life, the requirements for the service life, safety and low cost of lithium-ion batteries are getting higher and higher. At present, lithium-ion batteries are also moving towards high life, high safety, high rate and low direction of cost. At present, due to the low ionic conductivity of the cathode material of commercial lithium-ion batteries, during the high-rate charge and discharge process, the uppe...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/0525H01M10/42
CPCH01M4/625H01M4/5825H01M10/0525H01M10/4235H01M2004/028
Inventor 裴现一男万远鑫孔令涌赵中可任望保
Owner SHENZHEN DYNANONIC
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