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Preparation method for lithium manganese silicate/carbon composite material used as positive electrode material of lithium ion battery, and positive electrode slurry and application

A technology of carbon composite materials and lithium-ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low capacity, poor cycle performance, and poor electronic conductivity of lithium manganese silicate

Active Publication Date: 2017-02-22
江苏载驰科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Li 2 MnSiO 4 There are disadvantages such as poor electronic conductivity, low ion mobility, and changes in the crystal structure of the material due to the ginger-Taylor phenomenon of manganese ions, which restrict its application.
Currently, Li 2 MnSiO 4 The synthesis methods mainly include solid-phase method, sol-gel method and hydrothermal method, and the manganese lithium silicate prepared by it generally has problems such as low capacity and poor cycle performance.

Method used

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  • Preparation method for lithium manganese silicate/carbon composite material used as positive electrode material of lithium ion battery, and positive electrode slurry and application
  • Preparation method for lithium manganese silicate/carbon composite material used as positive electrode material of lithium ion battery, and positive electrode slurry and application
  • Preparation method for lithium manganese silicate/carbon composite material used as positive electrode material of lithium ion battery, and positive electrode slurry and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1. Egg yolk-eggshell structure SiO 2 Preparation of @void@C composite materials

[0036] (1) Weigh SiO with a particle size of about 100nm 2 Add 10 g of granules to 100 g of distilled water, and add 3 g of glucose under the action of magnetic stirring. Stir for 3h to make it evenly mixed.

[0037] (2) Stir the above solution at 60°C until the solvent is completely volatilized, grind the resulting solid in an agate mortar, then transfer to a tube furnace, and calcinate at 750°C for 4h under the protection of an inert atmosphere to obtain SiO 2 @C Composite.

[0038] (3) Then weigh 10g SiO 2 The @C composite material is added to 100 ml at a concentration of 1mol L -1 The NaOH solution was reacted for 2 h under magnetic stirring, then washed with distilled water for several times and collected by centrifugation, transferred to a blast drying oven, and dried at 80°C for 3 h. Obtain yolk-eggshell structure SiO 2 @void @C composites.

[0039] Step 2, preparation...

Embodiment 2

[0044] Step 1. Egg yolk-eggshell structure SiO 2 Preparation of @void@C composite materials

[0045] (1) Weigh SiO with a particle size of about 200nm 2 Add 10 g of granules to 100 g of distilled water, and add 2 g of glucose under the action of magnetic stirring. Stir for 3h to make it evenly mixed. The above solution was stirred at 60°C until the solvent was completely evaporated, the resulting solid was ground in an agate mortar, then transferred to a tube furnace, and calcined at 750°C for 4 h under the protection of an inert atmosphere to obtain SiO 2 @C Composite.

[0046] (2) Then weigh 10g SiO 2 The @C composite material was added to 100 ml of hydrofluoric acid solution with a mass fraction of 10%, reacted for 2 hours under magnetic stirring, then washed with distilled water several times and collected by centrifugation, transferred to a blast drying oven, and dried at 80°C for 3 hours . Obtain yolk-eggshell structure SiO 2 @void @C composites.

[0047] Step 2,...

Embodiment 3

[0052] Step 1. Egg yolk-eggshell structure SiO 2 Preparation of @void@C composite materials

[0053] (1) Weigh SiO with a particle size of about 80nm 2 Add 10 g of granules to 100 g of distilled water, and add 5 g of glucose under the action of magnetic stirring. Stir for 3h to make it evenly mixed.

[0054] (2) Stir the above solution at 60°C until the solvent is completely volatilized, grind the resulting solid in an agate mortar, then transfer to a tube furnace, and calcinate at 750°C for 4h under the protection of an inert atmosphere to obtain SiO 2 @C Composite.

[0055] (3) Then weigh 10g of SiO2@C composite material and add it to 100ml with a concentration of 2mol L -1 The NaOH solution was reacted under magnetic stirring for 1 h, then washed with distilled water several times and collected by centrifugation, transferred to a blast drying oven, and dried at 80°C for 3 h. Obtain yolk-eggshell structure SiO 2 @void @C composites.

[0056] Step 2, preparation of li...

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Abstract

The invention relates to a preparation method for a lithium manganese silicate / carbon composite material used as a positive electrode material of a lithium ion battery. The preparation method comprises the following steps: the surface of silicon dioxide is coated with an amorphous carbon layer; then a chemical etching reaction is performed to etch off a part of SiO<2> to generate a composite material with a yolk-egg shell structure, wherein by virtue of the SiO<2> composite material with the structure, the dimensions of lithium manganese silicate granules can be reduced while a lithium source and a manganese source can be dispersed into the SiO<2> main body through a carbon layer; the carbon layer on the surface of the SiO<2> can prevent the generated lithium manganese silicate from agglomerating; next, the SiO<2>@void@C composite material, the manganese salt and the lithium salt are added into a water solution based on certain proportion to be mixed uniformly; then the obtained solution is heated and volatilized to obtain a solid body, and high-temperature processing is performed under inert atmosphere protection to obtain the lithium manganese silicate / carbon composite material. The prepared lithium manganese silicate is uniform in granule dispersion without obvious agglomeration, and relatively small in granule sizes; and meanwhile, the surface is coated with the uniform amorphous carbon layer.

Description

technical field [0001] The invention belongs to the technical field of preparation of cathode materials for lithium ion batteries, and in particular relates to a method for preparing a lithium manganese silicate / carbon composite material for cathode materials of lithium ion batteries. Background technique [0002] Due to the advantages of high energy density, high power density, safety, and environmental protection, rechargeable lithium-ion batteries are widely used in communications, portable computers, and mobile electronic energy storage devices. With the widespread application of lithium-ion batteries in the field of mobile electronics, lithium-ion batteries are considered to be the best choice for large-scale energy storage devices as well as batteries for electric vehicles. However, large energy storage devices and large power batteries have higher requirements on the energy density and power density of lithium-ion batteries, so the development of positive and negati...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/5825H01M4/625H01M10/0525H01M2004/021Y02E60/10
Inventor 张娟
Owner 江苏载驰科技股份有限公司
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