Lithium titanate cathode 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 problem of affecting the electrochemical performance of lithium titanate negative electrode materials and cannot provide a stable coating layer structure Sexuality, inability to effectively isolate the nuclear structure and other issues, to achieve excellent ion transport performance, excellent electrochemical performance, and the effect of improving electrochemical performance

Inactive Publication Date: 2017-09-19
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the cladding layer is too thin, it cannot provide enough binding force to maintain the structural stability of the cladding layer in the process of battery preparation and use, and can not effectively isolate the function of the core structure in contact with the electrolyte; when cladding When the layer is too thick, it is easy to hinder the transport of ions inside and outside the particles, thus affecting the electrochemical performance of the lithium titanate negative electrode material itself.

Method used

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  • Lithium titanate cathode material and preparation method thereof

Examples

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Comparison scheme
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Embodiment 1

[0031] Embodiment 1, differs from comparative example in that this embodiment comprises the following steps:

[0032] Step 1. Preparation of nuclear structure: select lithium titanate particles of 100nm, and uniformly mix them with conductive agent components (the content of lithium titanate particles is 90%, and the conductive agent is Super P), and then spheroidize to obtain a particle diameter of about 12 μm. The secondary granular core structure is ready for use;

[0033] Step 2. Prepare coating layer slurry: mix asphalt, ammonium nitrate (ammonium nitrate accounts for 1% of solid content), and NMP to obtain coating layer slurry;

[0034] Step 3. Coating the slurry obtained in step 2 on the surface of the core structure in step 1, then heating and carbonizing, and removing the pore-forming agent in the coating layer at the same time, to obtain titanic acid with a shell structure layer porosity of 1% and a thickness of 1 μm Lithium anode material.

[0035] Others are the ...

Embodiment 2

[0036] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0037] Step 2. Prepare coating layer slurry: mix asphalt, ammonium nitrate (ammonium nitrate accounts for 2% of solid content), NMP, and obtain coating layer slurry;

[0038] Step 3. Coat the slurry obtained in step 2 on the surface of the core structure in step 1, then heat and carbonize, and remove the pore-forming agent in the coating layer at the same time to obtain titanic acid with a shell structure layer porosity of 2% and a thickness of 1 μm Lithium anode material.

[0039] Others are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0040] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0041] Step 2. Prepare coating layer slurry: mix asphalt, ammonium nitrate (ammonium nitrate accounts for 5% of solid content), NMP, and obtain coating layer slurry;

[0042] Step 3. Coat the slurry obtained in step 2 on the surface of the core structure in step 1, then heat and carbonize, and remove the pore-forming agent in the coating layer at the same time to obtain titanic acid with a shell structure layer porosity of 5% and a thickness of 1 μm Lithium anode material.

[0043] 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 studying, and particularly relates to a lithium titanate cathode material which comprises a core structure and a shell structure. Thickness of the shell structure is h1 which is less than or equal to 5um, the shell structure is of a porous structure, pores are of micro-nano size and are uniformly distributed in the shell structure, and porosity is 1-20%. In other words, the shell structure is thick enough, so that stability of the shell structure is maintained, and effective effect on isolating the core shell from an electrolyte is realized. The porous structure enables the lithium titanate cathode material to have excellent ion transmission performance, so that the lithium titanate cathode material has excellent 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): H01M4/36H01M4/485H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M10/0525Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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