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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

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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 effectively prevent the contact between the electrolyte and the active material, which leads to the technical requirements for particle surface coating. higher

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

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preparation example Construction

[0023] The following is a further elaboration on the preparation method of the coated pole piece of the lithium ion battery. The positive electrode active material of the lithium ion battery involved in the preparation method includes but is 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 electrolytes are sensitive to moisture, and related operations must be done under anhydrous conditions.

[0024] figure 1 It is a schematic cross-sectional view of the lithium-ion battery of Example 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 involved in the present invention mainly adds a layer of solid electrolyte layer on the surface of the positive active material, and effectively prevents the contact between the active material and the ele...

Embodiment 1

[0026] Take LiNi 0.5 mn 1.5 o 4 The positive electrode material is the research object, and the LiNi0.5 mn 1.5 o 4 , SP, PVDF and KS-6 were added to NMP in a certain order, mixed in vacuum for 5 hours, and then the slurry viscosity was adjusted to about 6000cps with NMP, and then the slurry was evenly coated on 20um aluminum foil on the coating machine and dried, according to 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 for use. Weigh a certain amount of PVA and dissolve it in acetone, stir it under vacuum for 2h to obtain a uniform solution, then mix 0.75 Li 2 S-0.25P 2 S 5 Add the solid electrolyte to the acetone solution of PVA, stir for 5 hours under vacuum cold water cooling, adjust the solid content to 70% with acetone, and the measured viscosity is 8000cps, and then apply the solid electrolyte slurry on the above-mentioned LiNi in a drying room 0....

Embodiment 2

[0028] Weigh a certain amount of PEO and dissolve it in acetone, stir it under vacuum for 5h to obtain a uniform solution, then mix Li 3 PO 4 -Li 2 S-SiS 2 Add the vitreous solid electrolyte into the acetone solution of PEO, stir for 7 hours under vacuum cold water cooling condition, adjust the solid content to 60% with acetone, and the measured viscosity is 10000cps, and then apply the solid electrolyte slurry in the drying room to the preparation in Example 1. Got LiNi 0.5 mn 1.5 o 4 The surface of the positive electrode sheet is dried in a vacuum oven at 70°C for 1h, and the coating thickness is 4um (the coating thickness drops to 3um after rolling), so as 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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