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, electrical components, etc., can solve the problems that affect the electrochemical performance of lithium titanate negative electrode materials, high battery internal resistance, contact resistance, etc. Large and other problems, to achieve the effect of eliminating negative effects, increasing solid content, and reducing internal resistance

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

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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

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Comparison scheme
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Embodiment 1

[0037] Embodiment 1, differs from comparative example in that this embodiment comprises the following steps:

[0038] Step 1, kneading: Lithium titanate, methyl methacrylate, sodium lauryl sulfate (mass ratio: lithium titanate: methyl methacrylate: sodium lauryl sulfate=93 :1:1), NMP (solid content is 1%) mixed and then kneaded, the revolution is 60 turns / min, and the rotation is 500 turns / min; Kneading 2h obtains mixture 1; Conductive carbon black, polyvinylpyrrolidone (mass ratio is Conductive carbon black: polyvinylpyrrolidone=4.9:0.1) and NMP (solid content is 0.5%) are mixed and kneaded, the revolution is 60 revolutions / min, and the rotation is 500 revolutions / min; Kneading 2h obtains mixture 2; Mixture 1, mixture 2 (mass ratio is lithium titanate: conductive carbon black=93:4.9) mixed together, continue kneading, revolution is 20 revolutions / min, rotation is 300 revolutions / min; After kneading 2h, obtain polymer monomer, nano titanic acid Mixed slurry with uniform dispe...

Embodiment 2

[0043] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0044] Step 1, kneading: Lithium titanate, methyl methacrylate, sodium lauryl sulfate (mass ratio: lithium titanate: methyl methacrylate: sodium lauryl sulfate=93 :1:1), NMP (solid content is 5%) are mixed and then kneaded, the revolution is 20 turns / min, and the rotation is 300 turns / min; Kneading 2h obtains mixture 1; Conductive carbon black, polyvinylpyrrolidone (mass ratio is Conductive carbon black: polyvinylpyrrolidone=4.9:0.1) and NMP (solid content is 2%) are mixed and kneaded, the revolution is 20 revolutions / min, and the rotation is 300 revolutions / min; Kneading 2h obtains mixture 2; Mixture 1, mixture 2 (mass ratio is lithium titanate: conductive carbon black=93:4.9) mixed together, continue kneading, revolution is 20 revolutions / min, rotation is 300 revolutions / min; After kneading 2h, obtain polymer monomer, nano titanic acid Mixed slurry with uniform dispers...

Embodiment 3

[0048] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0049] Step 1, kneading: Lithium titanate, methyl methacrylate, sodium lauryl sulfate (mass ratio: lithium titanate: methyl methacrylate: sodium lauryl sulfate=93 :1:1), NMP (solid content is 10%) mixed and kneaded, the revolution is 10 turns / min, and the rotation is 100 turns / min; Kneading 4h obtains mixture 1; Conductive carbon black, polyvinylpyrrolidone (mass ratio is Conductive carbon black: polyvinylpyrrolidone=4.9:0.1) and NMP (solid content is 5%) are mixed and kneaded, the revolution is 10 revolutions / min, and the rotation is 100 revolutions / min; kneading 4h obtains mixture 2; Mixture 1, mixture 2 (mass ratio is lithium titanate: conductive carbon black = 93:4.9) mixed together, continue to knead, the revolution is 10 revolutions / min, and the rotation is 100 revolutions / min; after kneading for 4 hours, polymer monomer and nano titanic acid Mixed slurry with unif...

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Abstract

The invention belongs to the field of energy storage researches and in particular 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 has a secondary particle structure formed by uniformly dispersing primary nanoparticles into conducting agents and tightly stacking; the primary nanoparticles comprise lithium titanate nanoparticles; conducting networks are distributed among the lithium titanate nanoparticles, among the conducting agents and between the lithium titanate nanoparticles and the conducting agents; the conducting networks are tightly connected with the lithium titanate nanoparticles and the conducting agents, so that the lithium titanate negative electrode material has good 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 Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/366H01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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