Positive pole piece and lithium ion battery

A technology of positive pole piece and positive film, applied in the field of positive pole piece and lithium ion battery, can solve the problem of failure to take into account the safety performance of battery piercing, and achieve the purpose of reducing the generation of metal burrs, preventing contact and weakening the embrittlement effect. Effect

Active Publication Date: 2021-02-09
CONTEMPORARY AMPEREX TECH CO
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  • Abstract
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Problems solved by technology

However, this patent fails to take into account the battery's nail-piercing safety performance, and cannot make the battery meet the real safe use standard

Method used

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  • Positive pole piece and lithium ion battery
  • Positive pole piece and lithium ion battery
  • Positive pole piece and lithium ion battery

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Experimental program
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preparation example Construction

[0054] (1) Preparation of positive pole piece

[0055] The first positive electrode active material shown in Table 1, the first conductive agent, the first binder are uniformly mixed with the organic solvent N-methylpyrrolidone (NMP) in proportion to prepare the first positive electrode slurry, and then the first The positive electrode slurry is evenly coated on one of the surfaces of the positive electrode current collector shown in Table 1, and the first positive electrode membrane is obtained after drying; the second positive electrode active material shown in Table 2, the second conductive agent, the second The binder is uniformly mixed with the organic solvent N-methylpyrrolidone (NMP) in proportion to prepare the second positive electrode slurry, and then the second positive electrode slurry is evenly coated on the first positive electrode diaphragm, and the second positive electrode slurry is obtained after drying. Two positive diaphragms.

[0056]Afterwards, the same ...

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Abstract

The invention provides a positive pole piece and a lithium ion battery. The positive pole piece comprises a positive electrode current collector, a first positive electrode diaphragm and a second positive electrode diaphragm. The first positive electrode diaphragm is arranged on the positive electrode current collector and comprises a first positive electrode active material, wherein the first positive electrode active material is selected from one or more of phosphate materials LiFe1-x-yMnxMyPO4, x being greater than or equal to 0 and less than or equal to 1, y being greater than or equal to0 and less than or equal to 0.1, and x+y being greater than or equal to 0 and less than or equal to 1, and M being selected from one or more of Cr,Mg, Ti, Al, Zn, W, Nb and Zr; the second positive electrode diaphragm is arranged on the first positive electrode diaphragm and comprises a second positive electrode active material, wherein the gram volume of the second positive electrode active material is higher than that of the first positive electrode active material, and the second positive electrode active material is different from the first positive electrode active material; and the thickness D0 of the positive electrode current collector is less than or equal to the thickness D1 of the first positive electrode diaphragm. Based on the positive pole piece, the lithium ion battery has the characteristics of high energy density and good nail penetrating safety performance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a positive pole piece and a lithium ion battery. Background technique [0002] As the energy density of lithium-ion batteries is further improved and the cost is further reduced, its application fields are becoming more and more extensive, especially in the fields of electric vehicles and energy storage. However, for lithium-ion batteries with high energy density, safety performance is currently one of the main bottlenecks restricting the expansion of their application fields, because in the case of abuse, lithium-ion batteries with insufficient safety design may have the possibility of thermal runaway, such as Smoke, fire or even explosion will occur, endangering personal and property safety. Generally, the capacity of electric vehicles and energy storage batteries is much larger than that of consumer electronics, and its capacity can usually reach tens of Ah, or even hundred...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/136H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/136H01M4/131H01M4/366H01M4/5825H01M4/525H01M4/505H01M10/0525H01M2004/028H01M2004/021Y02E60/10H01M2220/20
Inventor 李星王耀辉金海族
Owner CONTEMPORARY AMPEREX TECH CO
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