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Preparation method of lithium titanate negative electrode material and lithium titanate negative electrode material prepared by employing method

A negative electrode material, lithium titanate technology, applied in the field of preparation of lithium titanate negative electrode material and lithium titanate negative electrode material, can solve the problems of large gas production, large gap, affecting the electrochemical performance of lithium titanate negative electrode material, etc. The effect of smooth filling, reduced dispersion difficulty, and excellent electrochemical performance

Active Publication Date: 2017-11-03
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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  • Preparation method of lithium titanate negative electrode material and lithium titanate negative electrode material prepared by employing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1, differs from comparative example in that this embodiment comprises the following steps:

[0039] Step 1, dry-mix lithium metal powder, lithium titanate with a diameter of 100 nm, and graphite particles with a particle size of 6 μm until uniform;

[0040] Step 2, select the electrolyte solution with lithium hexafluorophosphate as the salt and PC as the solvent, add it to the above mixture and continue stirring. At this time, under the action of metal lithium powder, PC will peel off the graphite particles to form an open structure, and at the same time, the lithium titanate particles will filling into the inlet structure;

[0041] Step 3, after the filling is completed, the electrolyte components are removed, coated and carbonized to obtain the lithium titanate negative electrode material.

[0042] The rest are the same as the comparative example and will not be repeated here.

Embodiment 2

[0043] Embodiment 2 is different from the comparative example in that the present embodiment comprises the following steps:

[0044] Step 1, mixing and kneading lithium titanate with a diameter of 100 nm, graphite particles with a particle size of 6 μm, and lithium hexafluorophosphate as the salt and PC as the solvent until uniform;

[0045] Step 2, assemble the counter electrode with lithium iron phosphate as the power source material, and then form the counter electrode with the material obtained in step 1, connect the external circuit, charge with a current of 1A, peel off the graphite particles, and form a graphite sheet opening structure; After that, the nano-lithium titanate particles will be continuously filled into the opening structure of the graphite sheet;

[0046] Step 3, after the filling is completed, the electrolyte components are removed, coated and carbonized to obtain the lithium titanate negative electrode material.

[0047] The rest are the same as the com...

Embodiment 3

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

[0049] Step 1, dry mixing and kneading lithium metal powder, lithium titanate with a diameter of 100 nm, methyl methacrylate, sodium lauryl sulfate, and graphite particles with a particle size of 6 μm until uniform;

[0050] Step 2, select the electrolyte solution with lithium hexafluorophosphate as the salt and PC as the solvent, add it to the above mixture and continue stirring. At this time, under the action of metal lithium powder, PC will peel off the graphite particles to form an open structure, and at the same time, the lithium titanate particles will filling into the open structure;

[0051] Step 3, dissolving tert-butyl peroxybenzoate in PC to form an initiator solution, after the filling described in step 3 is completed, add the initiator solution, increase the temperature, and impel the polymerization reaction of the polymer monomer, in titanic acid A polymer ...

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Abstract

The invention belongs to the field of energy storage research, and particularly relates to a preparation method of a lithium titanate negative electrode material. The method mainly comprises the steps of 1, mixing a power source substance 1, nanometer lithium titanate particles and graphite particles until uniform mixing is achieved; 2, adding an electrolyte 1 and then continuing to mix to form ion passages, stripping the graphite particles under the effect of the power source substance at the moment to form an opening structure of a graphite sheet layer, and continuously filling the opening structure of the graphite sheet layer with the nanometer lithium titanate particles under a hybrid acting force; and 3, removing an electrolyte constituent after filling is completed, and performing coating and carbonization to obtain the lithium titanate negative electrode material. When the method is used for preparing a lithium titanate negative electrode, the opening of the graphite particle sheet layer and the filling of the lithium titanate particles can be simultaneously performed, so that the filling is smoother, and 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 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 Applications(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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