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Preparation method of lithium titanate negative electrode material and lithium titanate negative electrode material prepared by method

A negative electrode material, lithium titanate technology, applied in the preparation of lithium titanate negative electrode material, lithium titanate negative electrode material field, can solve the problems of difficult uniform and effective coating, low reactivity of graphene sheets, etc., easy to achieve Industrial mass production, excellent electrochemical performance, and low hindrance effect

Active Publication Date: 2017-10-20
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the graphene sheet itself has low reactivity, and it is difficult to evenly and effectively coat the surface of the lithium titanate core structure.

Method used

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  • Preparation method of lithium titanate negative electrode material and lithium titanate negative electrode material prepared by method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, the difference from the comparative example is that this embodiment includes the following steps:

[0033] Step 1. Select modified graphene with a sheet thickness of 1 nm and a sheet plane size of 40 μm (the graphene sheet contains hydroxyl, carboxyl, etc.), dissolve it in water to obtain a solution, and then spray into the coating chamber and make It has a negative charge of 10e;

[0034] Step 2. Preparation of core structure: select 100nm lithium titanate particles, mix them with conductive carbon black and then pelletize them to obtain a secondary particle core structure with a particle diameter of about 12μm, and then spray it into the coating chamber and make it With a positive charge of 20e;

[0035] Step 3. Adjust the air flow in the coating chamber so that the particles of step 1 are evenly coated on the surface of the core structure described in step 2 under the effect of negative charge;

[0036] Step 4. Pass water vapor into the coating chamber, and th...

Embodiment 2

[0037] The second embodiment is different from the first embodiment in that this embodiment includes the following steps:

[0038] Step 1. Select modified graphene with a sheet thickness of 1 nm and a sheet plane size of 40 μm (the graphene sheet contains hydroxyl, carboxyl, etc.), dissolve it in water to obtain a solution, and then spray into the coating chamber and make It has a negative charge of 10e;

[0039] Step 2. Preparation of core structure: select 100nm lithium titanate particles, mix them uniformly with the conductive agent components and then pelletize them to obtain a secondary particle core structure with a particle diameter of about 12μm, and then spray it into the coating chamber and make It has a positive charge of 100e;

[0040] Others are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0041] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0042] Step 1. Select modified graphene with a sheet thickness of 1 nm and a sheet plane size of 40 μm (the graphene sheet contains hydroxyl, carboxyl, etc.), dissolve it in water to obtain a solution, and then spray into the coating chamber and make It has a negative charge of 10e;

[0043] Step 2. Preparation of core structure: select 100nm lithium titanate particles, mix them uniformly with the conductive agent components and then pelletize them to obtain a secondary particle core structure with a particle diameter of about 12μm, and then spray it into the coating chamber and make It has a positive charge of 500e;

[0044] Others are the same as in Example 1, and will not be repeated here.

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Abstract

The invention belongs to the field of energy storage study, and particularly relates to a lithium titanate negative electrode material and a preparation method thereof. The lithium titanate negative electrode material comprises a core structure and a shell structure, wherein the shell structure uniformly coats the surface of the core structure; the thickness of the shell structure is h, and the h is smaller than or equal to 100nm. The preparation method of the lithium titanate negative electrode material comprises the following steps that 1, cladding layer slurry containing graphene is prepared; the slurry is sprayed into a cladding chamber; formed particles have electric charges, and the carried charge of each particle is Q1; 2, the core structure ingredients are sprayed into the cladding chamber, so that the surface of the core structure ingredients has the electric charges opposite to those of the particles in the step 1, and the carried charge of each particle is Q2; 3, cladding reaction is performed: the airflow in the cladding chamber is regulated, so that the particles in the step 1 uniformly coat the surface of the core structure in the step 2; 4, aftertreatment is performed to obtain a finished product of lithium titanate particles, so that the lithium titanate negative electrode material with excellent performance is prepared.

Description

Technical field [0001] The invention belongs to the technical field of energy storage materials, and particularly relates to a preparation method of a lithium titanate negative electrode material and a lithium titanate negative electrode material prepared by the method. Background technique [0002] Lithium-ion battery has the advantages of fast charge and discharge, good low temperature performance, large specific energy, low self-discharge rate, small size, light weight, etc. Since its birth, it has brought revolutionary changes to the field of energy storage and has been widely used Used in various portable electronic devices and electric vehicles. However, with the improvement of people's living standards, higher user experience puts forward higher requirements for lithium-ion batteries: faster charge and discharge (such as 5C or even 10C), and a wider temperature range (such as minus 30 degrees Celsius) Use, etc.; in order to solve the above problems, it is necessary to fin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/485H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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