Preparation method of lithium ion battery coating pole piece

A lithium-ion battery and coating technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of not being able to effectively prevent the contact between the electrolyte and the active material, hindering the deintercalation of lithium ions, and requiring high coating technology. Prevent contact, improve cycle life, reduce the effect of oxidative decomposition

Active Publication Date: 2013-10-23
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this particle coating process, if the coating is too dense, it will hinder lithium ion deintercalation, and the loose dot-like coating cannot eff

Method used

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  • Preparation method of lithium ion battery coating pole piece
  • Preparation method of lithium ion battery coating pole piece
  • Preparation method of lithium ion battery coating pole piece

Examples

Experimental program
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Example Embodiment

[0023] The preparation method of the coated pole piece of lithium ion battery is further described below. The positive active material of lithium ion battery involved in the preparation method includes but not limited to LiNi 0.5 Mn 1.5 O 4 , LiCoPO 4 , LiNi x Co y M z O 2 (Where x+y+z=1), LiCoO 2 , LiMnPO 4 And LiMn 2 O 4 These kinds of high voltage cathode materials. Vitreous solid electrolyte is sensitive to moisture, and related operations need to be completed under anhydrous conditions.

[0024] figure 1 It is a schematic cross-sectional view of a lithium-ion battery in Examples 1-7 of the present invention, and the circled part is the coated positive pole piece of the present invention. It can be seen that the positive pole piece of the present invention mainly adds a solid electrolyte layer to the surface of the positive active material, which effectively prevents the active material from contacting the electrolyte without affecting the deintercalation of the active materia...

Example Embodiment

[0025] Example 1:

[0026] LiNi 0.5 Mn 1.5 O 4 The cathode material is the research object, and the LiNi is mixed with the mass ratio of 94:3:2.5:0.5. 0.5 Mn 1.5 O 4 , SP, PVDF and KS-6 were added to NMP in a certain order, vacuum mixed for 5h, and then NMP was used to adjust the slurry viscosity to about 6000cps, and then the slurry was evenly coated on 20um aluminum foil on a coating machine and dried. Experimental process, the dry pole piece is rolled on a roller press to obtain a compacted density of 2.5g / cm 3 LiNi 0.5 Mn 1.5 O 4 Positive pole piece, ready to use. Weigh a certain amount of PVA and dissolve it in acetone, stir in vacuum for 2h to obtain a uniform solution, and then add 0.75Li to the solid electrolyte: PVA=95:5 by mass. 2 S-0.25P 2 S 5 The solid electrolyte was added to the acetone solution of PVA and stirred for 5 hours under vacuum cold water cooling. The solid content was adjusted to 70% with acetone, and the measured viscosity was 8000 cps. Then the solid el...

Example Embodiment

[0027] Example 2:

[0028] Weigh a certain amount of PEO and dissolve it in acetone, stir in vacuum for 5 hours to obtain a uniform solution, and then according to the mass ratio of solid electrolyte: PEO = 90: 10, the Li 3 PO 4 -Li 2 S-SiS 2 The vitreous solid electrolyte was added to the PEO acetone solution and stirred for 7 hours under vacuum cold water cooling. The solid content was adjusted to 60% with acetone, and the measured viscosity was 10000 cps. Then the solid electrolyte slurry was applied to the preparation in Example 1 in a drying room LiNi 0.5 Mn 1.5 O 4 The surface of the positive pole piece was dried in a vacuum oven at 70°C for 1 hour, and the coating thickness was 4um (the thickness of the coating decreased to 3um after rolling) to obtain LiNi 0.5 Mn 1.5 O 4 Positive Li 3 PO 4 -Li 2 S-SiS 2 Solid electrolyte coated electrode pole piece.

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Abstract

The invention discloses a preparation method of lithium ion battery coating pole piece. The preparation method comprises following steps: (1) weighing and dissolving a binder in a solvent, vacuum stirring for 1 to 10 hours to obtain a homogenous solution; (2) adding solid electrolyte powder to the solution prepared in the step (1), vacuum stirring for 1 to 12hours to obtain a solid electrolyte-binder-solvent mixture; (3) evenly coating the mixture prepared in the step (2) on the surface of the battery anode electrode, obtaining a solid electrolyte coating layer, which has a dry thickness between 2 and 5 [mu]m, after the mixture dries; (4) rolling the whole anode electrode prepared in the step (3) with a roller machine, and obtaining the lithium ion battery coating pole piece. The preparation method adds a solid electrolyte layer between the electrolyte liquid and the electrode active material, so that in the situation that active material lithium ion de-intercalation is not affected, contact between active material and electrolyte liquid can be effectively prohibited, oxygenolysis of electrolyte liquid under high voltage is reduced, and battery circulation lifetime is increased.

Description

technical field [0001] The invention relates to a preparation method of a coated pole piece of a lithium ion battery, in particular to a preparation method of a high voltage resistant lithium ion battery pole piece. Background technique [0002] Due to the advantages of high working voltage, high energy density (light weight), low self-discharge rate, no memory effect, long cycle life and no pollution, lithium-ion secondary batteries are widely used in various fields of daily life, ranging from small to various portable electronic devices. equipment, ranging from zero-emission electric vehicles. The main factor that determines the energy density, power density and cost of lithium-ion batteries is the cathode material. Energy density is a comprehensive reflection of voltage and capacity. Therefore, it is particularly important to have a battery cathode material with high voltage and large capacity at the same time, which can meet the requirements of smaller batteries in the f...

Claims

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Application Information

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IPC IPC(8): H01M4/139
CPCY02E60/122Y02E60/10
Inventor 杨续来方丽谢佳
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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