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Lithium-ion battery positive pole piece and preparation method thereof

A lithium-ion battery and positive pole piece technology, which is applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of affecting the electrical properties such as material magnification, the reduction of material conductivity, and the poor comprehensive electrical properties, so as to improve the High-temperature cycle life and high-temperature storage capacity retention, increased electrical conductivity, and improved overall electrical performance

Inactive Publication Date: 2020-12-29
HUNAN SHANSHAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the strong insulation of these commonly used coatings, the formed coating layer will prevent the migration of lithium ions during charge and discharge, reduce the conductivity of the material, increase the internal resistance, and affect the electrical properties such as the rate of the material.
[0004] In order to further improve the electrical properties of the material, the researchers tried to use carbon materials, conductive polymers, ion-conductive compounds, etc. to coat the positive electrode material, but there are still poor comprehensive electrical properties, complex coating process, and uneven coating. And other issues

Method used

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  • Lithium-ion battery positive pole piece and preparation method thereof
  • Lithium-ion battery positive pole piece and preparation method thereof
  • Lithium-ion battery positive pole piece and preparation method thereof

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Embodiment 1

[0032] A lithium ion battery positive electrode sheet of the present invention comprises a current collector aluminum foil and a positive electrode active material layer coated on the surface of the current collector aluminum foil, wherein the positive electrode active material layer is mainly composed of a positive electrode active material lithium cobaltate, a conductive agent carbon black SP , additives (Al(PO 3 ) 3 and LiPO 3 ) and binder PVDF 900, wherein the mass content of lithium cobaltate is 95%, the mass content of conductive agent SP is 2%, Al(PO 3 ) 3 and LiPO 3 The mass content is 0.5% (ie Al(PO 3 ) 3 and LiPO 3 The mass ratio of the two additives is 1:1), and the mass content of the binder PVDF 900 is 2%.

[0033] The preparation method of the lithium-ion battery positive pole piece of the present embodiment comprises the following steps:

[0034] (1) Homogenization: Add 23.8g conductive agent SP to the NMP glue of PVDF 900 adhesive (the PVDF glue is 297....

Embodiment 2

[0040] A lithium ion battery positive electrode sheet of the present invention comprises a current collector aluminum foil and a positive electrode active material layer coated on the surface of the current collector aluminum foil, wherein the positive electrode active material layer is mainly composed of a positive electrode active material lithium cobaltate, a conductive agent carbon black SP , additives (Al(PO 3 ) 3 and LiPO 3 ) and binder PVDF 900, wherein the mass content of lithium cobaltate is 93.2%, the mass content of conductive agent SP is 1.9%, Al(PO 3 ) 3 The mass content is 1.5% and LiPO 3 The mass content is 1.5% (ie Al(PO 3 ) 3 and LiPO 3 The mass ratio of the two additives is 1:1), and the mass content of the binder PVDF 900 is 1.9%.

[0041] The preparation method of the lithium-ion battery positive pole piece of the present embodiment comprises the following steps:

[0042] (1) Homogenization: Add 23.3g conductive agent SP to the NMP glue of PVDF 900 ...

Embodiment 3

[0046] A lithium ion battery positive electrode sheet of the present invention comprises a current collector aluminum foil and a positive electrode active material layer coated on the surface of the current collector aluminum foil, wherein the positive electrode active material layer is mainly composed of a positive electrode active material lithium cobaltate, a conductive agent carbon black SP , additives (Al(PO 3 ) 3 and LiPO 3 ) and binder PVDF 900, wherein the mass content of lithium cobaltate is 94%, the mass content of conductive agent SP is 2%, Al(PO 3 ) 3 and LiPO 3 The mass content is 1% (ie Al(PO 3 ) 3 and LiPO 3 The mass ratio of the two additives is 1:1), and the mass content of the binder PVDF 900 is 2%.

[0047] The preparation method of the lithium-ion battery positive pole piece of the present embodiment comprises the following steps:

[0048] (1) Homogenization: Add 23.5g conductive agent SP to the NMP glue of PVDF 900 adhesive (the PVDF glue is 294.0g...

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Abstract

The invention discloses a lithium-ion battery positive pole piece which comprises a current collector and a positive active material layer coating the surface of the current collector, the positive active material layer mainly comprises a positive active material, a conductive agent, additives and a binder, and the additives are aluminum phosphate and lithium phosphate. The preparation method comprises the following steps: (1) uniformly mixing the positive electrode active material, the binder, the conductive agent, the aluminum phosphate, the lithium phosphate and an organic solvent to obtainpositive electrode slurry; and (2) coating the surface of the current collector with the positive pole slurry, and drying to obtain the positive pole piece of a lithium-ion battery. The aluminum phosphate and the lithium phosphate are introduced into the positive active material layer of the positive pole piece of the lithium-ion battery at the same time to serve as the additives, and the comprehensive electrical properties such as high-temperature cycle, high-temperature storage performance and rate capability of the battery are synergistically improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery positive pole piece and a preparation method thereof. Background technique [0002] In lithium-ion batteries, the positive electrode material is one of the key elements of electrical performance, and it accounts for the highest cost of a single lithium battery. Therefore, the development of cathode materials has become an important factor restricting the performance improvement and price reduction of lithium-ion batteries. [0003] In lithium-ion batteries, the reaction between the positive electrode material and the electrolyte affects the performance of the battery. Especially under high temperature and high pressure conditions, this reaction will be significantly intensified, which will accelerate the failure of the positive electrode material, resulting in a decrease in battery cycle and storage performance. Researchers from various coun...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/04H01M10/0525H01M10/42
CPCH01M4/0404H01M4/667H01M10/0525H01M10/4235Y02E60/10
Inventor 舒威周银
Owner HUNAN SHANSHAN ENERGY TECH CO LTD
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