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Pole piece and lithium ion battery

A pole piece and protective layer technology, which is applied in the field of electrochemistry, can solve the problems that the safety and electrical performance of lithium-ion batteries cannot be balanced, and achieve the effect of improving the pass rate of nail penetration tests, reducing the probability of fire failure, and improving safety.

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

AI Technical Summary

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

[0057] 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:

[0058] The protective layer includes 62 parts by mass of alumina, 30 parts by mass of acrylic-modified PVDF and 8 parts by mass of carbon black, wherein the D10 of alumina is 0.3 μm, D50 is 0.9 μm, and D90 is 1.3 μm. Thermal decomposition The temperature is above 2900°C, the hardness is 23.1Gpa, and the thickness of the protective layer is 3μm;

[0059]The positive active material layer includes 96 parts by mass of positive 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 active material layer is 30 μm.

[0060] The preparation method of the pole piece provided in...

Embodiment 2

[0062] The pole piece provided in this example can refer to Example 1, the difference is that the protective layer includes 70 parts by mass of alumina, 25 parts by mass of acrylic-modified PVDF and 5 parts by mass of carbon black.

Embodiment 3

[0064] For the pole piece provided in this example, refer to Example 1, except that the protective layer includes 80 parts by mass of alumina, 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 the following components in percentage by mass: 62%-97% of a non-active material, 0.1%-8% of a conductive agent and 3%-30% of a binder, and the resistivity of the protective layer is 500-5000 omega.cm. The pole piece provided by the invention comprises the protective layer, and the mass fraction of each component in the protective layer and the resistivity of the protective layer are controlled, so that the problems of fire outbreak, aging and the like of the lithium ion battery under the conditions of mechanical abuse and the like are effectively solved, and meanwhile, the electrical property of the battery is basically not influenced; the problem that safety and electrical performance of the lithium ion battery cannot be considered at the same time is solved.

Description

technical field [0001] The invention relates to a pole piece and a lithium ion battery, and relates to the technical field of electrochemistry. 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] At present, 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 safe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/0525
CPCH01M4/13H01M4/62H01M10/0525Y02E60/10
Inventor 杨锦帅彭冲
Owner ZHUHAI COSMX BATTERY CO LTD
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