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Lithium ion battery positive pole piece as well as preparation method and lithium ion battery comprising pole piece

A technology for lithium-ion batteries and positive pole pieces, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low capacity retention, poor structural stability, poor conductivity, etc., to reduce erosion, reduce battery impedance, Improve the effect of electrical contact

Inactive Publication Date: 2014-06-11
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of poor conductivity, poor structural stability and low capacity retention rate of manganese-based solid solution materials in the prior art, the present invention provides a manganese-based solid solution material with good conductivity, good structural stability and high capacity retention rate. Lithium-ion battery cathode sheet, preparation method thereof, and lithium-ion battery containing the cathode sheet

Method used

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  • Lithium ion battery positive pole piece as well as preparation method and lithium ion battery comprising pole piece

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preparation example Construction

[0027] The present invention also provides a method for preparing the positive pole piece of the present invention, the method comprising the following steps:

[0028] S1, preparing a conductive film layer: preparing a first mixed solution containing a conductive active material, a second binder and a polar solvent and coating it on both sides of the positive current collector, and then vacuum drying to obtain a conductive film coated The positive current collector of the layer;

[0029] S2, preparing the active film layer: preparing a second mixture containing an organic solvent, a first binder, a positive electrode conductive agent, a rare earth oxide and a positive electrode active material and coating it on the positive electrode current collector coated with a conductive film layer On the surface, the positive electrode sheet can be obtained by drying.

[0030] According to the preparation method provided by the present invention, preferably, the mass ratio of the conduc...

Embodiment 1

[0050] The preparation method of the positive pole piece is as follows:

[0051] 1. Add 20 parts of binder PVDF into 80 parts of polar solvent NMP, stir until the viscosity change is less than 3%, and obtain a transparent colloidal binder; then weigh 15 parts of nano-graphite and add it to the above transparent colloid, and add 120 Parts of organic solvent NMP were stirred until the change in viscosity was less than 5%, to obtain a conductive film layer solution, which was left to stand for use.

[0052] 2. Weigh 8 parts of PVDF and add it to 100 parts of NMP, stir until the viscosity change is less than 3%, to obtain a transparent colloidal adhesive; then add 8 parts of conductive agent carbon black, stir until the viscosity change is less than 3%, to obtain an active film layer Conductive colloid; then 2 parts of CeO with a particle size of about 50 nanometers 2 Rare earth oxide additive and 100 parts Li 1.15 Ni 0.2 co 0.1 mn 0.55 o 2 The lithium-rich manganese-based s...

Embodiment 2

[0055] The preparation method of the positive pole piece of the present embodiment is as follows:

[0056] 1. Add 15 parts of binder PVDF to 60 parts of polar solvent NMP, stir until the viscosity change is less than 3%, and obtain a transparent colloidal binder; then weigh 10 parts of nano-graphite and 10 parts of graphene and add them to the above transparent colloid , while adding 140 parts of organic solvent NMP and stirring until the viscosity change is less than 5%, to obtain a conductive film layer solution, which is left to stand for use.

[0057] 2. Weigh 6 parts of PVDF and add it to 100 parts of NMP, stir until the viscosity change is less than 3%, to obtain a transparent colloidal adhesive; then add 6 parts of conductive agent carbon black, stir until the viscosity change is less than 3%, to obtain an active film layer Conductive colloid; then 2 parts of Y with a particle size of about 30 nanometers 2 o 3 Rare earth oxide additive and 100 parts Li 1.15 Ni 0.2 c...

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Abstract

The invention provides a lithium ion battery positive pole piece. The positive pole piece comprises a current collector, positive active membrane layers which are arranged on the front surface and the back surface of the current collector and conductive membrane layers which are arranged between the current collector and each positive active membrane layer, wherein each positive active membrane layer comprises first binder, a positive conducting agent, a rare-earth oxidant and a positive active substance. The invention also discloses a preparation method of the positive pole piece and a lithium ion battery comprising the positive pole piece. The lithium ion battery is good in conducting performance, good in structural stability and high in capacity retention ratio.

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, a preparation method thereof and a lithium ion battery containing the pole piece. Background technique [0002] As a high-performance new green secondary battery, lithium-ion batteries occupy a major position in digital markets such as mobile phones, notebooks, and cameras, and have become the main source of civilian electronic products. In recent years, with the advancement of science and technology, the requirements for energy storage equipment in the fields of electronic products, electric vehicles, medical equipment, and aerospace have been increasing, and lithium-ion batteries with high energy density and long cycle life have been widely used. Higher and higher requirements are put forward for the development of new electrode materials with high energy, miniaturization and high magnification. However, the key techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCY02E60/122H01M4/131H01M4/1391H01M4/621H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 沈晞尹斌梁美浩张淑静江文锋
Owner SHANGHAI BYD
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