Preparation method of lithium titanate negative electrode material and lithium titanate negative electrode material prepared by the 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., to achieve easy Industrial mass production, excellent electrochemical performance, and low hindrance effect

Active Publication Date: 2020-06-26
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 the method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, differs from comparative example in that this embodiment comprises the following steps:

[0033] Step 1, select the modified graphene (the graphene sheet contains hydroxyl, carboxyl, etc.) that the thickness of the sheet is 1nm and the plane size of the sheet is 40 μm, dissolve 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 uniformly with conductive carbon black, and then pelletize to obtain a secondary particle core structure with a particle diameter of about 12 μm, and then spray it into the coating chamber, and make it With a positive charge of 20e;

[0035] Step 3, adjusting the airflow in the coating chamber, so that the particles in step 1 are evenly coated on the surface of the nuclear structure described in step 2 under the action of negative charges;

[0036]Step 4, water vapor is pa...

Embodiment 2

[0037] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0038] Step 1, select the modified graphene (the graphene sheet contains hydroxyl, carboxyl, etc.) that the thickness of the sheet is 1nm and the plane size of the sheet is 40 μm, dissolve 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 conductive agent components, and then spheroidize to obtain a secondary particle core structure with a particle diameter of about 12 μm, which is then sprayed into the coating chamber and made 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 the modified graphene (the graphene sheet contains hydroxyl, carboxyl, etc.) that the thickness of the sheet is 1nm and the plane size of the sheet is 40 μm, dissolve 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 conductive agent components, and then spheroidize to obtain a secondary particle core structure with a particle diameter of about 12 μm, which is then sprayed into the coating chamber and made 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 in particular 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 batteries have brought revolutionary changes to the field of energy storage since their birth due to their advantages such as fast charging and discharging, good low-temperature performance, large specific energy, small self-discharge rate, small size, and light weight. 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 charging and discharging (such as 5C or even 10C), wider temperature range (such as minus 30 degrees Celsius) Use, etc.; In order to solve the above problems, it is necessary to find new...

Claims

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Application Information

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Patent Type & Authority Patents(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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