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Safe lithium ion battery

A lithium-ion battery, safe technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of Al current collector corrosion, difficult to hydrolyze, low impedance, etc., to improve safety and cycle, and not easy to hydrolyze , the effect of high thermal stability

Inactive Publication Date: 2011-10-05
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, imine lithium salts, such as LiTFSI, compared to LiPF 6 , has higher thermal stability (decomposition at 350°C), is not easy to hydrolyze, has good compatibility with graphite negative electrodes, and can form a low-impedance and stable SEI film, but it is corrosive to Al current collectors, so generally not use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] According to the technical requirements, a 40 μm thick polypropylene PTC conductive film is used as the positive current collector, the conductive filler is carbon black, and the content is 45wt.%. Commercialized LiMn 2 o 4 As the positive electrode active material, the positive electrode ingredients are mixed according to the weight ratio of active material: carbon black: binder = 80: 12: 8, uniformly coated on polyethylene film, and dried in a vacuum oven at 80 ° C. electrode. Commercial artificial graphite is used as the negative electrode, and the negative electrode ingredients are mixed according to the weight ratio of active material: carbon black: binder = 86:8:6, and evenly coated with a copper foil collector with a thickness of 15 μm. Dry at 120°C to make electrodes. Then the two electrodes are cut according to the specifications, paired and assembled into an 18650 battery, the separator used is a commercial lithium-ion battery separator, and the electrolyte ...

Embodiment 2

[0018] According to technical requirements, a 40 μm thick polypropylene PTC conductive film is used as the negative electrode current collector, and the conductive filler is Cu with a content of 45 wt%. The positive and negative electrode coating formulations are the same as in Example 1, and the positive electrode slurry is uniformly coated on a 25 μm aluminum foil current collector, and dried at 120° C. to form an electrode. The negative electrode slurry was uniformly coated on the polyethylene film, and dried in a vacuum oven at 80°C to form an electrode. The rest is the same as in Example 1, and the 18650 battery is made, and the discharge current 1C capacity is 1.9Ah. The battery is subjected to overcharge, overdischarge, and short-circuit tests according to the GB / T18287-2000 test standard. When the temperature of the shell rises to about 150°C , the circuit is protected.

Embodiment 3

[0020] According to the technical requirements, a 50 μm thick polypropylene PTC conductive film is used as the current collector of the positive and negative electrodes. The conductive filler of the positive electrode current collector is carbon black, and the negative electrode is made of Cu with a content of 50%. The positive and negative electrode formulations are the same as in Example 1, and are dried in a vacuum oven at 80°C to make electrodes. The rest is the same as in Example 1, and an 18650 battery is made, and the discharge current 1C capacity is 1.7Ah. The battery is tested for overcharge, overdischarge, and short circuit according to the GB / T18287-2000 test standard. When the temperature of the shell rises to about 150°C , the circuit is protected.

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PUM

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Abstract

The invention discloses a safe lithium ion battery, which comprises an anode system, a cathode system, a membrane spaced between an anode and a cathode, and an electrolyte system, wherein the anode system comprises an anode current collector and a membrane attached to the anode current collector and containing an anode active substance; the cathode system comprises a cathode current collector and a membrane attached to the cathode current collector and containing a cathode active substance; an organic conductive film is used as the current collector in one or both of the anode system and the cathode system; and a polymer matrix with positive temperature coefficient (PTC) thermistor property is adopted in the organic conductive film. The organic conductive film has the PTC thermistor property. The lithium ion battery can avoid the safety problems of battery combustion and even explosion and the like caused by over charge and battery temperature rise due to external short circuit.

Description

technical field [0001] The invention relates to a battery, in particular to a lithium-ion battery with high safety features to prevent combustion or even explosion caused by improper use of overcharge and external short circuit. Background technique [0002] The electrolytes currently used in commercial lithium-ion batteries are mainly organic electrolytes. Since organic electrolytes are flammable, lithium-ion batteries using organic electrolytes have potential safety hazards during use. Due to the lack of awareness of the safety hazards of lithium-ion batteries, users often experience improper use of external short-circuits and overcharges, which in turn cause lithium-ion batteries to burn or even explode due to temperature rise, not only causing huge personal injuries to users, but also Due to the occurrence of such individual incidents, lithium battery manufacturers had to recall a large number of sold batteries and suffered huge economic losses. [0003] According to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/66H01M4/62
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 李劼袁长福刘晋赖延清张治安洪树卢海宋海申
Owner CENT SOUTH UNIV
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