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Current collector, electrode plate and lithium ion battery

A current collector and positive electrode technology, applied in the field of lithium batteries, can solve complex problems

Pending Publication Date: 2021-09-14
HUIZHOU LIWINON ELECTRONIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the purposes of the present invention is to provide a current collector that can effectively solve the current complex problem of thermal runaway. By using the current collector of the present invention, the short-circuit switch can be cut off in time after the battery is short-circuited, thereby preventing the occurrence of thermal runaway

Method used

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  • Current collector, electrode plate and lithium ion battery
  • Current collector, electrode plate and lithium ion battery
  • Current collector, electrode plate and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A current collector, comprising a substrate 11 and a safety coating 12 coated on at least one surface of the substrate 11; the safety coating 12 includes flame-retardant particles 121, heat-resistant additives, conductive agents and binders; The flame retardant particles 121 are transformed into an insulating layer 13 between the substrate 11 and the safety coating 12 at 80-180°C.

[0055] Concrete preparation method is:

[0056] S1. Selection of substrate: aluminum foil with a thickness of 10 μm is used as the substrate 11 of the current collector 1;

[0057] S2. Configuration of safety coating slurry: mix and stir flame-retardant particle 121 powder, heat-resistant additive, conductive agent, and adhesive according to the dry weight ratio of 10:80:2:8, and disperse them evenly in NMP solvent. Stir well and filter for later use;

[0058] S3. Coating of the safety coating: coating the safety coating 12 slurry on at least one surface of the aluminum foil by means of gr...

Embodiment 2～8

[0063] The difference from Example 1 is the content of various substances in the safety coating, the particle size of the flame-retardant particles and the heat-resistant additive, and the details are shown in Table 1 below. The rest are the same as in Embodiment 1, and will not be repeated here.

[0064] Table 1

[0065]

[0066] It can be seen from the above test results that the current collectors with the safety coating of the present invention can greatly increase the pass rate of the acupuncture test and the unilateral extrusion test of the lithium-ion battery compared with the current collectors without the safety coating. It can be seen that the current collector provided by the present invention, due to the addition of flame-retardant particles, will decompose and transform into a layer between the base material and the safety coating when the temperature exceeds the normal use temperature of the battery and reaches 80-180°C. The dense insulating layer greatly blo...

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Abstract

The invention provides a current collector, an electrode plate and a lithium ion battery. The current collector comprises a base material and a safe coating applied on at least one surface of the base material, the safe coating comprises flame-retardant particles, a heat-resistant additive, a conductive agent and a binder; and the flame-retardant particles are converted into an insulating layer between the base material and the safe coating at 80-180 DEG C. According to the current collector, the base material is coated with the safe coating with safety, the flame-retardant particles are added into the safe coating, the flame-retardant particles do not change during the normal use temperature period of a battery and do not influence the electrochemical performance of the battery; and when the temperature exceeds the normal use temperature of the battery, and reaches 80-180 DEG C, the flame-retardant particles can be decomposed and converted into the compact insulating layer between the base material and the safe coating, so that the contact between an active substance and the base material is greatly blocked, the transmission of lithium ions and electrons is hindered, and a short-circuit switch is cut off in time, and therefore, the purpose of preventing the thermal runaway of the battery is achieved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a current collector, an electrode pole piece and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of convenient use, high energy density, long cycle life, and environmental friendliness, so they are widely used in portable electronic devices and emerging new energy vehicles. Lithium-ion batteries are inseparable from people's lives. Any device with power supply that people use is always equipped with lithium-ion batteries. In line with the concept of green environmental protection, under the spring breeze supported by the state, the lithium-ion battery industry has also sprung up. However, with the rapid development of lithium-ion batteries, the product quality is also uneven. Therefore, more and more media are rushing to report safety accidents such as explosions, combustion, and smoking of lithium-ion batteries. With the expos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M50/581H01M4/13H01M10/058H01M10/0525H01M10/42A62C3/16
CPCH01M4/667H01M50/581H01M4/13H01M10/058H01M10/0525H01M10/4235A62C3/16Y02P70/50Y02E60/10
Inventor 孙先维赖旭伦陈杰杨山郑明清
Owner HUIZHOU LIWINON ELECTRONIC TECH CO LTD
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