Electrode sheet and electrochemical energy storage device

An electrode sheet and compound technology, which is used in electrochemical generators, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of increased electrode sheet quality and thickness, poor electrical conductivity, poor cycle life, etc., to improve heat resistance. Effects of impact and overcharge performance, good cycling performance and high temperature storage performance, good kinetic performance

Inactive Publication Date: 2019-02-05
CONTEMPORARY AMPEREX TECH CO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of the current collector is cumbersome due to the double-layer coating; in addition, the conductive polymer PEDOT:PSS coating has poor conductivity, which leads to serious polarization and poor cycle life of the lithium-ion battery. From the perspective of the fluid as a whole, the conductivity of the current collector will deteriorate, so the polarization of the active material layer on the surface of the current collector will become more serious; moreover, there is a conductive slurry between the conductive polymer coating and the metal current collector. Material coating, which is equivalent to the double-coating treatment of the electrode sheet, greatly increases the overall mass and thickness of the electrode sheet, and reduces the quality and volumetric energy density of the lithium-ion battery

Method used

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  • Electrode sheet and electrochemical energy storage device
  • Electrode sheet and electrochemical energy storage device
  • Electrode sheet and electrochemical energy storage device

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Experimental program
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Effect test

Embodiment 1

[0041] (1) Preparation of positive electrode sheet

[0042] Conductive polymer compound 2 is dissolved in water and fully stirred, wherein, the solid content of conductive polymer is 10%, then add carbon-based conductive material conductive carbon black SP-Li (the ratio of D50 and specific surface area of ​​SP-Li is D50 : specific surface area = 40nm: 62m 2 / g), after fully stirring, the conductive coating slurry is obtained, and then the conductive coating slurry is evenly coated on both surfaces of the positive electrode current collector aluminum foil with a thickness of 12 μm, and dried to obtain a conductive coating on the positive electrode current collector. layer, wherein the carbon-based conductive material conductive carbon black SP-Li is added in an amount of 5% of the total mass of the conductive coating, and the thickness of the conductive coating is 2 μm.

[0043] The cathode active material LiNi 0.6 co 0.2 mn 0.2 o 2 , the binder polyvinylidene fluoride (PV...

Embodiment 2

[0053] The preparation process of lithium ion battery is the same as embodiment 1, the difference is that,

[0054] (1) Preparation of positive electrode sheet

[0055] Replace carbon-based conductive material conductive carbon black SP-Li with conductive carbon black 350G, the ratio of D50 and specific surface area of ​​350G is D50: specific surface area = 40nm: 770m 2 / g.

Embodiment 3

[0057] The preparation process of lithium ion battery is the same as embodiment 1, the difference is that,

[0058] (1) Preparation of positive electrode sheet

[0059] Replace carbon-based conductive material conductive carbon black SP-Li with conductive carbon black EC-300J, the ratio of D50 and specific surface area of ​​EC-300J is D50: specific surface area = 50nm: 400m 2 / g.

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Abstract

The invention provides an electrode sheet and an electrochemical energy storage device. The electrode sheet comprises a current collector and an active material layer. The electrode sheet further comprises a conductive coating. The conductive coating is arranged between the current collector and the active material layer and comprises a conductive polymer and a carbon-based conductive material. The conductive polymer is selected from complexes of polythiophene and polyanion. The electrode sheet provided by the invention can enable the electrochemical energy storage device to have relatively low initial internal resistance and have good kinetic properties; meanwhile, when the electrochemical energy storage device is abused, the safety performance of the electrochemical energy storage deviceis improved, and the thermal shock resistance and overcharge performance of the electrochemical energy storage device are improved; meanwhile, the electrochemical energy storage device further has good cycle performance and high-temperature storage performance.

Description

technical field [0001] The present application relates to the field of energy storage devices, in particular to an electrode sheet and an electrochemical energy storage device. Background technique [0002] Lithium-ion batteries have rapidly occupied the consumer electronics market due to their advantages such as high working voltage, large specific capacity, small self-discharge, long cycle life, no memory effect, and environmental friendliness, and their applications in the field of power storage have expanded rapidly. However, the safety issue of lithium-ion batteries, especially the thermal runaway caused by the abuse of lithium-ion batteries has become one of the biggest hidden dangers in the application of lithium-ion batteries. During the abuse process, the lithium-ion battery generates intense heat, and the heat that cannot be dissipated in time will cause serious heat accumulation inside the lithium-ion battery, eventually leading to thermal runaway of the lithium-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0525
CPCH01M4/13H01M10/0525Y02E60/10
Inventor 张翠林永寿张明鞠峰韩昌隆
Owner CONTEMPORARY AMPEREX TECH CO
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