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

Battery electrode pole piece and preparation method thereof, battery and terminal

A battery electrode and pole piece technology, which is applied in the direction of battery electrodes, electrode manufacturing, electrode carriers/collectors, etc., can solve the problems of increased local polarization differences of batteries, lower battery rate performance, lower charge and discharge platforms, etc., to achieve improved Cycling stability, high coating amount, effect of reducing polarization

Pending Publication Date: 2021-11-23
HUAWEI TECH CO LTD
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the increase of the coating surface density of the pole piece will significantly increase the thickness of the pole piece, and the distribution of pores after rolling is relatively uneven. There are few overpressure pores on the surface of the pole piece. If there are too many, it is difficult for the electrolyte to penetrate from the surface to the inside, which will lead to an increase in the local polarization difference of the battery and cause a decrease in the battery rate performance, a decrease in the charge and discharge platform, and deteriorate the battery performance

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
  • Battery electrode pole piece and preparation method thereof, battery and terminal
  • Battery electrode pole piece and preparation method thereof, battery and terminal
  • Battery electrode pole piece and preparation method thereof, battery and terminal

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0070] The embodiment of the present application also provides a method for preparing the above battery electrode sheet 100, including:

[0071] S101. Mix the electrode active material, functional microspheres, conductive agent and binder to make a slurry; the functional microspheres include a shell and a liquid wrapped in the shell, the shell includes a polymer elastomer, and the liquid includes a liquid with a boiling point of 80 Liquids within the range of ℃ to 250℃ and not containing active hydroxyl groups;

[0072] S102 , coating the slurry on the current collector, and rolling after drying to obtain the battery electrode sheet 100 .

[0073] In the embodiment of the present application, in step S101, the selection of the electrode active material, functional microspheres, conductive agent and binder is as described above, and will not be repeated here. Wherein, the electrode active material, the binder, the functional microsphere and the conductive agent are mixed accor...

Embodiment 1

[0101] Preparation of battery negative pole piece:

[0102] (1) Add the negative electrode active material, binder, functional microspheres and conductive agent into deionized water according to the mass ratio of 95.5:3.0:0.7:0.8, mix evenly and adjust the viscosity to the specification range to prepare the slurry; the negative electrode The active material is graphite, the binder includes carboxymethyl cellulose and styrene-butadiene rubber, the conductive agent is acetylene black, the functional microspheres are polyacrylonitrile-acrylate wrapped diethyl carbonate (DEC), the particle size is 8 μm, and the shell is The body thickness is 2 μm;

[0103] (2) Coat the slurry prepared above on the surface of the 8 μm copper foil current collector, control the coating speed at 3 m / min, dry in an oven to remove water, and perform cold pressing. Among them, the temperature of the first section of oven drying is 60°C, the time is 1.5min, the temperature of the second section is 70°C,...

Embodiment 2

[0109] Compared with Example 1, the difference of Example 2 is that the liquid filled inside the functional microspheres is dimethyl carbonate (DMC). The lithium ion battery adopts the battery negative electrode sheet prepared in Example 2.

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

PropertyMeasurementUnit
boiling pointaaaaaaaaaa
elastic modulusaaaaaaaaaa
elastic modulusaaaaaaaaaa
Login to View More

Abstract

The invention provides a battery electrode pole piece, which comprises a current collector and an active material layer arranged on the current collector, wherein the active material layer comprises an electrode active material and functional microspheres distributed in the electrode active material, each functional microsphere comprises a shell and a liquid wrapped in the shell, the shell comprises a polymer elastomer, and the liquid includes a liquid having a boiling point in the range of 80 DEG C to 250 DEG C and not containing active hydroxyl groups. According to the battery electrode pole piece provided by the invention, high porosity and uniform pore distribution can be obtained on the basis of ensuring high coating weight of the pole piece, so that the ion mobility and the ion migration uniformity are effectively improved, a battery can be quickly charged under the condition of high energy density, and meanwhile, the rate capability and the cycling stability of the battery are improved. The invention also provides a preparation method of the battery electrode pole piece, a battery and a terminal.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a battery electrode pole piece, a preparation method thereof, a battery and a terminal. Background technique [0002] Due to the advantages of high energy density, high operating voltage, long service life, low self-discharge rate, and environmental friendliness, lithium-ion batteries have been widely used in end products (smart phones, digital cameras, laptops, and electric vehicles, etc.) . However, with the continuous improvement of the application range and design requirements of end products, the demand for battery energy density is getting higher and higher. [0003] In the pursuit of higher energy density design, increasing the coating area density of the positive and negative electrodes is an effective technical means to increase the energy density of the battery. However, in the prior art, the increase of the coating surface density of the pole ...

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 Applications(China)
IPC IPC(8): H01M4/66H01M4/62H01M4/04H01M10/0525
CPCH01M4/667H01M4/62H01M4/621H01M4/0407H01M10/0525Y02E60/10
Inventor 邓耀明张新枝徐凡高云雷谢封超
Owner HUAWEI TECH CO LTD