Positive pole piece and battery

A technology of positive pole piece and positive pole is applied in the field of positive pole piece and battery, which can solve the problem of large short-circuit current of battery and so on.

Inactive Publication Date: 2021-03-19
ZHUHAI COSMX POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a positive pole piece and a ...

Method used

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preparation example Construction

[0051] See Figure 7 , Figure 7 It is a flowchart of a method for preparing a positive electrode sheet provided by an embodiment of the present invention. like Figure 7 As shown, the preparation method of the positive pole piece comprises:

[0052] Step 701, coating the third coating slurry on at least one of the first side and the second side opposite to the positive electrode current collector, and drying;

[0053] Step 702, coating the first positive electrode coating slurry on the third coating, and drying;

[0054] Step 703, coating the second positive electrode coating slurry on the first positive electrode coating, and drying;

[0055] Wherein, the third coating is formed by mixing positive electrode nanoparticles and a solvent, and the content of positive electrode nanoparticles in the third coating accounts for 15% to 25%; the first positive electrode coating slurry is made of positive electrode Nanoparticles and a solvent are mixed, and the content of the posi...

Embodiment and 5

[0077] Introduce 2 kinds of specific embodiments and 5 kinds of comparative examples of the embodiments of the present invention below:

Embodiment 1

[0079] Step 1, coating the third coating 20 on the positive electrode current collector 10 . Specifically, the third coating slurry is prepared first, and the third coating slurry mainly includes conductive carbon black Super P, accounting for 92%. The solid content of the third coating slurry is controlled at 5%, and the viscosity is controlled at 1000Mpas. After preparing the third coating slurry, use the gravure coating technique to uniformly coat the third coating slurry on the surface of the positive electrode current collector (aluminum foil), and control the coating thickness to 1.5 μm on one side, After drying in an oven, the first coating treatment is completed.

[0080] Step 2, coating the first anode coating 30 on the third coating 20 . Specifically, the first positive electrode coating slurry is first prepared, the first positive electrode coating slurry mainly includes lithium iron phosphate particles, and the median diameter D50 of the lithium iron phosphate pa...

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Abstract

The invention provides a positive pole piece and a battery, and the positive pole piece is provided with a third coating, a first positive coating and a second positive coating which are sequentiallylaminated on a positive current collector. When the battery is internally short-circuited, the first positive electrode coating can increase the contact impedance of the positive electrode piece and reduce the short-circuit current in the battery, so that the heat production heat in the battery is reduced, and the risk of safety out-of-control of the battery is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive pole piece and a battery. Background technique [0002] Lithium batteries are prone to internal short circuits when they are overcharged, heated, squeezed, etc. [0003] In the design of power lithium batteries, it is generally desired that the lithium battery has a higher rate, and the lithium battery with a higher rate is less safe. This is due to the high rate of the power type battery, and the short-circuit current inside the battery will be large under the risk of overcharging, heating, extrusion, etc., according to Q=I 2 Rt, when the battery is short-circuited, the heat Q generated inside the battery will also be greater, which will cause a greater risk of lithium battery safety out of control. SUMMARY OF THE INVENTION [0004] The purpose of the embodiments of the present invention is to provide a positive pole piece and a battery, which solve ...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/613H01M4/13H01M4/1391H01M4/62
CPCH01M4/13H01M4/1391H01M4/624H01M4/667H01M10/613Y02E60/10
Inventor 余开明申红光靳玲玲
Owner ZHUHAI COSMX POWER CO LTD
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