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Preparation method of lithium ion battery positive electrode material and lithium ion battery positive electrode material prepared by employing method

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large gaps, large contact resistance, and affecting the electrochemical performance of lithium-ion batteries, so as to reduce the difficulty of dispersion and smooth filling , the effect of 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 primary particles of the nanostructure and the conductive agent is small and the gap is large, so the contact resistance is relatively large, and the internal resistance of the finished positive electrode material is relatively large, which affects the lithium ions that use it as the positive electrode material. The electrochemical performance of the battery is fully developed (mainly manifested as large impedance, large polarization, and severe heat generation)

Method used

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  • Preparation method of lithium ion battery positive electrode material and lithium ion battery positive electrode material prepared by employing method

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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 iron phosphate 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 primary particles of the positive electrode will fill into the mouth structure;

[0041] Step 3, after the filling is completed, the electrolyte components are removed, coated and carbonized to obtain the positive electrode material of the lithium-ion battery.

[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 iron phosphate 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; Afterwards, the nano-positive primary particles will continue to fill 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 positive electrode material of the lithium-ion battery.

[0047] The rest are the same ...

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 iron phosphate 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 primary particles of the positive electrode will fill into the opening 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 promote the polymerization reaction of the polymer monomer, on...

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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 ion battery positive electrode material. The method mainly comprises the steps of 1, dry-mixing a power source substance 1, nanometer positive primary 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 to form an opening structure of a graphite sheet layer, and continuously filling the opening structure of the graphite sheet layer with the nanometer positive primary particles; or 1', uniformly mixing the nanometer positive primary particles, the graphite particles and an electrolyte 2 for use; 2', assembling a power source substance 2 and the product obtained in the step 1' to form paired electrodes, applying a current between the two electrodes, stripping the graphite particles to form the opening structure of the graphite sheet layer, and continuously filling the opening structure of the graphite sheet layer with the nanometer positive primary particles; 3, removing an electrolyte constituent after filling is completed, and performing coating and carbonization to obtain the lithium ion battery positive electrode material. When the method is used for preparing a lithium ion battery positive electrode, the opening of the graphite particle sheet layer and the filling of the nanometer positive primary particles can be simultaneously performed, so that the filling is smoother, and the lithium ion battery positive 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 positive electrode material of a lithium ion battery and a positive electrode material of a lithium ion battery 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: longer standby time, faster charging and discharging speed, etc.; in order to solve the above problems, it is necessary to find new ones with better performance electrode materi...

Claims

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Application Information

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