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Lithium titanate negative electrode material and preparation method thereof

A negative electrode material, lithium titanate technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of large contact resistance, small contact area, large gas production, etc., to reduce contact resistance, increase contact area, and easily fill effect

Active Publication Date: 2020-08-18
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the contact area between the nanostructured lithium titanate material and the conductive agent is small and the gap is large, so the contact resistance is relatively large, and it is easy to generate gas in contact with the electrolyte. Larger gas volume, which affects the electrochemical performance of lithium titanate negative electrode materials

Method used

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  • Lithium titanate negative electrode material and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1, differs from comparative example in that this embodiment comprises the following steps:

[0042] Step 1, precursor preparation: lithium titanate, methyl methacrylate, sodium lauryl sulfate (mass ratio is lithium titanate: methyl methacrylate: sodium lauryl sulfate = 100:2:1), after mixing NMP (solid content is 10%) and kneading, the revolution is 30 rpm, and the rotation is 300 rpm; kneading for 4 hours to obtain a uniformly dispersed precursor;

[0043] Step 2, preparation of worm-like graphene-dominated conductive network structure: select microcrystalline graphite as raw material, then add concentrated sulfuric acid and potassium permanganate for oxidative intercalation, and obtain graphite oxide whose oxygen-containing functional group accounts for 15% of the total mass of graphite oxide. Then heat treatment to obtain worm-like graphene for use;

[0044] Step 3, filling: Vacuum the worm-like graphene obtained in step 2, then place it in the precursor ...

Embodiment 2

[0047] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0048] Step 2, preparation of worm-like graphene-dominated conductive network structure: select microcrystalline graphite as raw material, then add concentrated sulfuric acid and potassium permanganate for oxidative intercalation to obtain graphite oxide whose oxygen-containing functional group accounts for 5% of the entire graphite oxide mass, Then heat treatment to obtain worm-like graphene for use;

[0049] The rest are the same as in Embodiment 1 and will not be repeated here.

Embodiment 3

[0050] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0051] Step 2, preparation of worm-like graphene-dominated conductive network structure: select microcrystalline graphite as raw material, then add concentrated sulfuric acid and potassium permanganate for oxidative intercalation, and obtain graphite oxide whose oxygen-containing functional group accounts for 20% of the mass of the entire graphite oxide. Then heat treatment to obtain worm-like graphene for use;

[0052] The rest are the same as in Embodiment 1 and will not be repeated here.

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Abstract

The invention belongs to the technical field of an energy storage material, and particularly relates to a lithium titanate negative electrode material. The lithium titanate negative electrode material comprises a core structure and a shell structure, wherein the core structure is a secondary particle structure and comprises a main conductive network and nanometer lithium titanate primary particles, the main conductive network is provided with a porous structure, the porous structure of the main conductive network is filled with the nanometer lithium titanate primary particles, an auxiliary conductive network is laid between the main conductive network and the nanometer lithium titanate primary particles and is used for tightly connecting the main conductive network and the nanometer lithium titanate primary particles, so that the lithium titanate negative electrode material is enabled to have favorable electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a lithium titanate negative electrode material and a preparation method thereof. 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 electrode materials with more excellent performance. [0003] A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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