Unlock instant, AI-driven research and patent intelligence for your innovation.

Electrode pole piece and electrochemical device comprising said electrode pole piece

A pole piece and anode technology, which is applied in the field of electrochemical devices, can solve the problems of reducing the safety of batteries and electrochemical short circuits, and achieve the effects of improving uneven lithium deposition, improving safety, and reducing the probability of lithium dendrite formation

Active Publication Date: 2021-10-22
DONGGUAN POWERAMP TECH LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formation of lithium dendrites will to a large extent puncture the separator between the anode electrode and the cathode electrode, resulting in direct contact between the cathode electrode and the anode electrode, resulting in an electrochemical short circuit, which greatly reduces the safety of the cell.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electrode pole piece and electrochemical device comprising said electrode pole piece
  • Electrode pole piece and electrochemical device comprising said electrode pole piece
  • Electrode pole piece and electrochemical device comprising said electrode pole piece

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0141] Preparation of lithium-ion batteries

[0142] The cathode active material is prepared into a lithium ion battery by the following preparation method. Specifically, the cathode active material, conductive agent, and binder are fully stirred and mixed in N-methylpyrrolidone according to a certain weight ratio to make a cathode slurry, and then the obtained cathode slurry is evenly coated on the cathode current collector The front and back surfaces of the aluminum foil are dried at 85°C to obtain a cathode active material layer, and then cold pressed, stripped, cut into pieces, and cathode tabs are welded to obtain a cathode sheet.

[0143] Fully stir and mix the anode active material, binder, and dispersant in deionized water according to a certain weight ratio to make an anode slurry, and then evenly coat the anode slurry on the front and back of the anode current collector copper foil , and then dried at 85°C to form an anode active material layer, and then perform c...

Embodiment 1-9 and comparative example 1-10

[0154] Examples 1-9 involved zone coating the cathode tab without zone coating the anode tab. The following will specifically describe the preparation method of the cathode sheet in Examples 1-9 and Comparative Examples 1-10:

[0155] The preparation method of the electrode pole piece of embodiment 1:

[0156] (1) Preparation of slurry

[0157] Cathode LiNi 0.8 co 0.1 mn 0.1 o 2 / LiCoO 2 Slurry: the cathode active component LiNi 0.8 co 0.1 mn 0.1 o 2 / LiCoO 2 , the conductive agent Super-P and the binder polyvinylidene fluoride PVDF are mixed in a weight ratio of 97%: 1.5%: 1.5%, and diluted with an appropriate amount of N-methylpyrrolidone, and then stirred in a vacuum mixer to form a uniform cathode slurry material.

[0158] Anode graphite slurry: mix positive active component graphite, binder styrene-butadiene rubber SBR and dispersant carboxymethyl cellulose CMC in a 97%:1%:2% weight ratio, and dilute with an appropriate amount of distilled water, and then mix ...

Embodiment 10-14 and comparative example 11-15

[0176] Examples 10-14 and Comparative Examples 11-15 only involve zone coating on the anode pole piece, but not zone coating on the cathode pole piece. The preparation methods of the anode pole pieces in Examples 10-14 and Comparative Examples 11-15 will be described in detail below:

[0177] The preparation method of the electrode pole piece of embodiment 10:

[0178] (1) Preparation of slurry

[0179] Anode graphite / hard carbon slurry: mix positive active component graphite / hard carbon, binder styrene-butadiene rubber SBR and dispersant carboxymethyl cellulose CMC in a 97%:1%:2% weight ratio, and dilute with an appropriate amount of distilled water , and then stirred in a vacuum mixer to form a uniform anode slurry.

[0180] Cathode LiNi 0.8 co 0.1 mn 0.1 o 2 Slurry: the cathode active component LiNi 0.8 co 0.1 mn 0.1 o 2 , the conductive agent Super-P and the binder polyvinylidene fluoride PVDF are mixed in a weight ratio of 97%: 1.5%: 1.5%, and diluted with an ap...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present application relates to an electrode pole piece and an electrochemical device comprising the electrode pole piece. The anode pole piece described in this application includes a first anode area and an anode second area, wherein the DC resistance value R of the anode second area is A2 less than or equal to the DC resistance value R of the anode first zone A1 98% of. The cathode pole piece described in this application includes a cathode first area and a cathode second area, wherein the DC resistance value R of the cathode second area is C2 greater than the DC resistance value R of the first region of the cathode C1 . When the anode pole piece and / or cathode pole piece described in this application is applied to an electrochemical device, the formation of lithium dendrites can be effectively reduced, and the safety of the electrochemical device can be improved.

Description

technical field [0001] The present application relates to the field of energy storage technology, in particular to an electrode pole piece and an electrochemical device including the electrode pole piece. Background technique [0002] With the popularity of consumer electronics products such as notebook computers, mobile phones, handheld game consoles, tablet computers, mobile power supplies and drones, people have increasingly strict requirements on electrochemical devices (eg, batteries). For example, people not only require the battery to be light, but also require the battery to have a high capacity and a long working life. Among many batteries, lithium-ion batteries have occupied a mainstream position in the market due to their outstanding advantages such as high energy density, high safety, low self-discharge, no memory effect, and long working life. [0003] However, until now, the safety of electrochemical devices has not been effectively guaranteed. For example, a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/36H01M4/583H01M4/62H01M10/0525H01M4/02
CPCH01M4/13H01M4/36H01M4/583H01M4/625H01M10/0525H01M2004/021Y02E60/10H01M4/131H01M4/133H01M4/134H01M4/386H01M4/525H01M4/587H01M2004/027H01M2004/028H01M4/364H01M4/366
Inventor 王慧鑫黄思林程晟余红明
Owner DONGGUAN POWERAMP TECH LTD