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Lithium titanate negative electrode material and preparation method thereof

A negative electrode material, lithium titanate technology, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problems that affect the electrochemical performance of lithium titanate negative electrode materials, large contact resistance, battery internal resistance Advanced problems, to achieve the effect of solving gas production problems, ensuring stability, and low impedance

Active Publication Date: 2020-04-28
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

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0042] Step 1, precursor preparation: lithium titanate, methyl methacrylate, sodium dodecyl sulfate (mass ratio is lithium titanate: methyl methacrylate: sodium dodecyl sulfate = 95:4:1) and NMP after mixing (solid content is 10%) and kneading, the revolution is 30 rev / min, and the autorotation is 300 rev / min; kneading for 4h obtains a uniformly dispersed precursor;

[0043] Step 2, preparation of the main conductive network structure of modified worm-like graphene: selecting microcrystalline graphite as a raw material, then adding concentrated sulfuric acid and potassium permanganate for oxidation intercalation to obtain graphite oxide, and then heat-treating to obtain worm-like graphene; The graphene is placed in a mixture of concentrated sulfuric acid, potassium permanganate and sodium nitrate to modify it to obtain a modified worm-shaped graphene grafted w...

Embodiment 2

[0048] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0049] Step 2, preparation of the main conductive network structure of modified worm-like graphene: selecting microcrystalline graphite as a raw material, then adding concentrated sulfuric acid and potassium permanganate for oxidation intercalation to obtain graphite oxide, and then heat-treating to obtain worm-like graphene; Graphene is placed in a mixture of concentrated sulfuric acid, potassium permanganate, and sodium nitrate to modify it to obtain a modified worm-like graphene grafted with 5% functional groups for use;

[0050] The rest are the same as those in Embodiment 1, and will not be repeated here.

Embodiment 3

[0051] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0052] Step 2, preparation of the main conductive network structure of modified worm-like graphene: selecting microcrystalline graphite as a raw material, then adding concentrated sulfuric acid and potassium permanganate for oxidation intercalation to obtain graphite oxide, and then heat-treating to obtain worm-like graphene; The graphene is placed in a mixture of concentrated sulfuric acid, potassium permanganate and sodium nitrate to modify it to obtain a modified worm-shaped graphene grafted with 15% functional groups for use;

[0053] The rest are the same as those in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the field of energy storage research and particularly relates to a lithium titanate negative electrode material. The lithium titanate negative electrode material comprises a core structure and a shell structure, and the core structure is a secondary particle structure and comprises a main conductive network with a porous structure and nano primary particles filled in the porous main conductive network structure. The main conductive network is structurally high in chemical bond force, and the nano primary particles are closely locked in the porous structure of the main conductive network through chemical bonds, so that excellent electrochemical performances of the lithium titanate negative electrode material are guaranteed.

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): H01M4/36H01M4/485H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/485H01M10/0525Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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