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Positive plate and energy storage device

A technology of positive electrode sheet and positive electrode film, which is applied in the direction of positive electrode, vehicle energy storage, battery electrode, etc., can solve the problem of deteriorating the power performance of lithium-ion batteries, and achieve suitable for large-scale production, excellent high-temperature storage performance, and low DC internal resistance Effect

Active Publication Date: 2018-10-23
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as an electrolyte additive, PST is easy to reduce on the surface of the negative electrode of the lithium-ion battery to form a SEI film with high impedance, which seriously deteriorates the power performance of the lithium-ion battery.

Method used

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Effect test

preparation example Construction

[0030] Secondly, the preparation method of the positive electrode sheet according to the second aspect of the present invention is described, which is used to prepare the positive electrode sheet described in the first aspect of the present invention, including the steps: (1) firstly mix the positive electrode active material, optional conductive agent, optional The binder is mixed evenly, and then a solvent is added for dispersion, and then an additive containing a C=C double bond cyclic sultone compound is added for further mixing and dispersion to obtain a positive electrode slurry; (2) the positive electrode obtained in step (1) The slurry is coated on the surface of the positive electrode current collector, and then dried to form a positive electrode membrane; (3) the positive electrode membrane dried in step (2) is sequentially rolled, slit and sliced ​​to obtain the positive electrode sheet .

[0031] The preparation method of the positive electrode sheet of the present...

Embodiment 1

[0051] (1) Preparation of positive electrode sheet

[0052] The cathode active material LiNi 0.8 co 0.1 mn 0.1 o 2 (NCM811), conductive agent Super P, and binder polyvinylidene fluoride (PVDF) were mixed evenly, and then the solvent N-methylpyrrolidone (NMP) was added for dispersion to obtain a dispersion liquid in which each component was uniformly dispersed, and compound 1 Added as an additive to the above dispersion liquid and further mixed and dispersed to obtain positive electrode slurry, wherein the solid content in the positive electrode slurry is 77wt%, and the mass ratio of positive electrode active material, additive, conductive agent, and binder is 96.9:0.1:2 : 1; coating the positive electrode slurry obtained above on both surfaces of a positive electrode current collector aluminum foil with a thickness of 14 μm; then blowing and drying at 90° C., rolling, slitting and slicing to obtain positive electrode sheets.

[0053] (2) Preparation of negative electrode s...

Embodiment 2

[0062] The preparation process of lithium ion battery is the same as embodiment 1, and the difference is that,

[0063] (1) Preparation of positive electrode sheet

[0064] The mass ratio of the positive electrode active material, the additive, the conductive agent, and the binder is 96.8:0.2:2:1.

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Abstract

The invention provides a positive plate and an energy storage device. The positive plate comprises a positive current collector and a positive diaphragm, wherein the positive diaphragm is arranged onthe positive current collector and comprises a positive active material; and the positive diaphragm also comprises an additive which comprises a cyclic sultone compound containing a carbon-carbon double bond. The positive plate provided by the invention has good interface stability and does not significantly increase the interface impedance of a negative pole in the energy storage device when applied to the energy storage device, so the energy storage device has lower direct-current internal resistance, and excellent high-temperature storage performance, high-temperature thermal stability andlow-temperature lithium precipitation performance. The preparation method for the positive plate provided by the invention has the advantages of simple process, easy operation, and applicability to large-scale production.

Description

technical field [0001] The invention relates to the field of energy storage devices, in particular to a positive electrode sheet and an energy storage device. Background technique [0002] Due to the characteristics of high energy density, long cycle life, and no pollution, lithium-ion batteries have broad application prospects in consumer electronics, power vehicle batteries, and energy storage power supplies. [0003] Regardless of the application field, people have put forward higher requirements for the endurance, stability and safety of lithium-ion batteries. In order to improve the energy density of lithium-ion batteries, it is one of the effective ways to develop cathode active materials for lithium-ion batteries with high specific capacity. At present, high-nickel cathode active materials have become a research hotspot due to their higher theoretical specific capacity than other cathode active materials. However, the high nickel metal content in the high-nickel pos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/42
CPCH01M4/131H01M4/364H01M4/505H01M4/525H01M4/628H01M10/0525H01M10/4235H01M10/052H01M10/054H01M2004/028Y02E60/10H01M4/625H01M4/623Y02T10/70
Inventor 张明韩昌隆
Owner CONTEMPORARY AMPEREX TECH CO
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