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

A kind of lithium ion battery and preparation method thereof

A lithium-ion battery and isolation layer technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of powder floating, battery safety hazards, powder falling, etc., to prolong service life, reduce short-circuit rate, Effect of Wear Stability

Active Publication Date: 2020-11-17
DONGGUAN CHUANGMING BATTERY TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-ion battery, aiming to solve the technical problem that the slurry on the positive and negative electrodes of the existing lithium-ion battery is prone to powder drop and floating powder, which causes battery safety hazards

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
  • A kind of lithium ion battery and preparation method thereof
  • A kind of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0044] The embodiment of the present invention also provides a preparation method of a lithium ion battery, comprising the following steps:

[0045] S10. Obtain the barium sulfate, antimony trioxide and binder in the formula, add the barium sulfate, the antimony trioxide and the binder into a solvent and mix them to obtain the isolation slurry;

[0046] S20. Obtain the pole piece, coat the isolation slurry on the surface of the active material of the pole piece, and dry it to obtain the pole piece with the isolation layer formed on the surface;

[0047] S30. Obtain a separator and an electrolyte, and make a lithium-ion battery by making a positive electrode sheet, a negative electrode sheet, the separator, and the electrolyte, and at least one of the positive electrode sheet and the negative electrode sheet is the The surface forms the pole piece of the isolation layer.

[0048] The preparation method of the lithium ion battery that the embodiment of the present invention pro...

Embodiment 1

[0063] A kind of lithium ion battery, its preparation comprises the steps:

[0064] ① The positive electrode slurry was formulated with lithium nickel cobalt manganese oxide, conductive graphite, NMP solvent, and binder according to conventional methods, wherein the weight ratio of lithium nickel cobalt manganese oxide to conductive graphite was 95:5. And the positive electrode slurry is coated on the aluminum foil current collector, and after being fully dried at 100° C. to 150° C., the electrode sheet is processed to obtain the positive electrode sheet.

[0065] ② According to the mass ratio of barium sulfate: antimony trioxide: polyvinylidene fluoride binder is (90-94): (3-5): (3-5), added to the total solid weight 100-120% N-methylpyrrolidone is mixed to obtain an isolation slurry with a viscosity of 100-500 cps.

[0066] ③Apply the prepared isolation slurry on the positive electrode sheet with a thickness of 1-2um. After baking in an oven at 100-200°C for 10min-120min, t...

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
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The present invention belongs to the technical field of batteries, and in particular relates to a lithium ion battery, which includes: a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte, and the active material surface of the positive electrode sheet and / or the negative electrode sheet is coated There is an isolation layer. Based on the total mass of the isolation layer being 100%, the isolation layer includes the following raw material components in mass percentages: barium sulfate 90-94%, antimony trioxide 3-5%, bonding agent 3‑5%. The isolation layer of the present invention is coated on the surface of the positive and negative electrode plates of the battery, which not only effectively blocks the phenomenon of floating powder and falling powder on the positive and negative electrode plates from affecting the safety performance of the lithium-ion battery, but also prevents the damage of the fine powder on the surface of the positive and negative electrode plates to the separator. puncture, reducing the short-circuit rate, and the isolation layer coated on the positive and negative electrode plates can absorb and store the electrolyte, preventing the electrolyte from being squeezed out due to expansion during the charging and discharging process of the lithium-ion battery, and improving the cycle effect of the battery. Extended service life.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion battery has many advantages such as high voltage, high energy density, long cycle life, small self-discharge, no memory effect, wide operating temperature range, and environmental friendliness. It is recognized as an ideal chemical energy source in today's society and is commonly used in modern life. Energy storage and conversion devices are widely used in portable electronic devices such as mobile phones and laptop computers, large-scale energy storage power stations and electric vehicles. With the rapid development of electronic information equipment, technology and economy in modern society, the application of lithium-ion batteries is becoming more and more common. Not only the performance requirements and demand for lithium-ion batteries are also getting higher and higher, but ...

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): H01M10/0525H01M10/42H01M10/058H01M10/0587
CPCH01M10/0525H01M10/058H01M10/0587H01M10/4235Y02E60/10Y02P70/50
Inventor 赵悠曼
Owner DONGGUAN CHUANGMING BATTERY TECH