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Pole piece and lithium ion battery

A pole piece and protective layer technology, which is applied in the field of pole pieces and lithium-ion batteries, can solve the problems that the safety and electrical performance of lithium-ion batteries cannot be balanced, so as to improve the pass rate of nail penetration tests and solve the problems of safety and electrical performance. The effect of taking into account and reducing the probability of fire failure

Pending Publication Date: 2022-03-08
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a pole piece, which is used to solve the problem that the safety and electrical performance of lithium-ion batteries cannot be balanced

Method used

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  • Pole piece and lithium ion battery
  • Pole piece and lithium ion battery
  • Pole piece and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0052] The pole piece provided in this embodiment is a positive pole piece, including a current collector aluminum foil, a protective layer located on the surface of the current collector, and a positive electrode active material layer located on the protective layer away from the surface of the current collector, wherein:

[0053] The protective layer includes 62 parts by mass of inactive materials, 30 parts by mass of acrylic acid-modified PVDF and 8 parts by mass of carbon black, wherein the inactive material is carbon-coated alumina, and the quality of the carbon layer is the quality of alumina 0.5%, the D10 of the inactive material is 0.02 μm, the D50 is 0.3 μm, the D90 is 2 μm, and the thickness H1 of the protective layer is 2 μm;

[0054] The positive electrode active material layer includes 96 parts by mass of positive electrode active material LCO, 2 parts by mass of binder PVDF, and 2 parts by mass of conductive agent carbon black, and the thickness H2 of the positive...

Embodiment 2

[0057] The pole piece provided in this embodiment can refer to Embodiment 1, the difference is that the protective layer includes 70 parts by mass of inactive materials, 25 parts by mass of acrylic-modified PVDF and 5 parts by mass of carbon black.

Embodiment 3

[0059] The pole piece provided in this embodiment can refer to Embodiment 1, the difference is that the protective layer includes 80 parts by mass of inactive materials, 15 parts by mass of acrylic-modified PVDF and 5 parts by mass of carbon black.

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Abstract

The invention provides a pole piece and a lithium ion battery. The pole piece comprises a substrate, the substrate comprises a current collector and a protective layer arranged on the surface of the current collector, and an active material layer is further arranged on the protective layer; the protective layer comprises, by mass, 62%-96% of an inactive material, 0.1%-8% of a conductive agent and 3%-30% of a binder, the inactive material comprises inorganic particles and a carbon layer coating the surfaces of the inorganic particles, and the mass of the carbon layer is smaller than 10% of the mass of the inorganic particles. The pole piece provided by the invention can solve the problem that the safety and the electrical property of the lithium ion battery cannot be considered at the same time.

Description

technical field [0001] The invention relates to a pole piece and a lithium ion battery, and relates to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in smartphones, laptops, Bluetooth, wearable devices and other fields due to their advantages such as high platform voltage, high energy density, no memory effect, and long life. However, in some extreme cases, for example, when the lithium-ion battery is subjected to mechanical damage, such as acupuncture, heavy impact, etc., an internal short circuit will occur, and a large amount of heat will be released in a short period of time, causing the lithium-ion battery to catch fire and fail. big security risk. [0003] Setting a protective layer on the surface of the current collector helps to improve the safety of lithium-ion batteries, but it will lead to a decrease in the electrical performance of lithium-ion batteries. Therefore, how to balance the safety and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/131H01M10/0525
CPCH01M4/667H01M4/663H01M4/131H01M10/0525H01M2200/00Y02E60/10
Inventor 张健彭冲
Owner ZHUHAI COSMX BATTERY CO LTD
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