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A high-safety high-energy-density lithium-ion battery

A lithium-ion battery, high energy density technology, applied in the field of lithium-ion batteries, can solve the problems of not being able to sense the temperature change of lithium-ion batteries in time, weak thermal runaway control, etc., to improve safety, increase energy density, and achieve the effect of simple operation

Active Publication Date: 2020-03-24
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The proposed solution for improving the safety of lithium-ion batteries, the external PTC element cannot sense the temperature change inside the lithium-ion battery in time, and the control of thermal runaway is weak

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation of stabilized lithium metal powder with positive temperature coefficient effect comprises the following steps:

[0025] a) Put a 3*3cm lithium metal sheet into a reactor with a stirrer at room temperature under a dry argon flow atmosphere, add 1kg of mineral oil, heat to 200°C, and stir at 300rpm to obtain molten lithium metal;

[0026] b) stirring the molten lithium metal obtained in step a) at 8000 rpm for 2 minutes, and then cooling to 40° C. to obtain dispersed lithium metal;

[0027] c) Dissolve 20g of polythiophene in 50g of mineral oil, then add it to the dispersed lithium metal obtained in step b), stir at 1000rpm for 15min, filter in an argon atmosphere, wash with ethane three times, and then use n-pentane Wash once; store airtight after vacuum drying.

[0028] Negative electrode sheet preparation: choose natural graphite as the negative electrode active material, mix it with solvent water according to the ratio of active material: conductive a...

Embodiment 2

[0035] The preparation of stabilized lithium metal powder with positive temperature coefficient effect comprises the following steps:

[0036] a) Put a 3*3cm lithium metal sheet into a reactor with a stirrer at room temperature under a dry argon flow atmosphere, add 1kg of mineral oil, heat to 220°C, and stir at 400rpm to obtain molten lithium metal;

[0037] b) stirring the molten lithium metal obtained in step a) at 8000 rpm for 3 minutes, and then cooling to 40° C. to obtain dispersed lithium metal;

[0038] c) 20g of poly-3-methylthiophene was dissolved in 50g of mineral oil, then added to the dispersed lithium metal obtained in step b), stirred at 1000rpm for 18min, filtered in an argon atmosphere, washed three times with ethane, and then Wash once with n-pentane; vacuum dry and pulverize and store in airtight.

[0039] Negative sheet preparation: Lithium titanate is selected as the negative active material, mixed with solvent water according to the ratio of active mater...

Embodiment 3

[0046] The preparation of stabilized lithium metal powder with positive temperature coefficient effect comprises the following steps:

[0047] a) Put a 3*3cm lithium metal sheet into a reactor with a stirrer at room temperature under a dry argon flow atmosphere, add 1kg of mineral oil, heat to 230°C, and stir at 700rpm to obtain molten lithium metal;

[0048] b) stirring the molten lithium metal obtained in step a) at 8000 rpm for 5 minutes, and then cooling to 40° C. to obtain dispersed lithium metal;

[0049] c) 20g of poly-3-decylthiophene was dissolved in 50g of mineral oil, then added to the dispersed lithium metal obtained in step b), stirred at 1000rpm for 20min, filtered in an argon atmosphere, washed three times with ethane, and then Wash once with n-pentane; vacuum dry and pulverize and store in airtight.

[0050] Negative electrode sheet preparation: choose graphite, silicon material or alloy negative electrode material as the negative electrode active material, mi...

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Abstract

The invention relates to a high-safety high-energy-density lithium-ion battery. The lithium-ion battery includes a positive electrode, a negative electrode, a diaphragm, and an electrolyte. The core is packaged into the battery casing, injected with electrolyte and sealed to obtain a battery, and the surface of the positive electrode or / and negative electrode is coated with stabilized lithium metal powder with a positive temperature coefficient effect. Improvement inside the battery can sense the internal temperature change in time, and because a layer of stabilized lithium metal powder is coated on the surface of the battery pole piece, it can improve the first effect of the battery, not only does not affect the energy density of the battery, but also Improve the energy density of the battery; using stabilized lithium metal powder, the use is not restricted by the environment, and the operation is easier. At the same time, it has a special positive temperature coefficient effect, which can improve the safety of the battery.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a high-safety high-energy-density lithium-ion battery that can improve battery energy density and battery safety. Background technique [0002] Lithium-ion batteries have the advantages of no pollution, high energy density, high power density, high voltage, long cycle life, small self-discharge, and no memory effect. They have been widely used in digital products such as mobile phones, cameras, and notebook computers. With the development of lithium batteries, lithium batteries have also been widely used as power batteries for vehicles. With the advancement of science and technology, people urgently need a lithium-ion battery with high energy density to meet the development trend of miniaturization and thinning of various electrical appliances, and the cruising range of electric vehicles needs to be improved. Therefore, the current major battery manufacturers are trying ever...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0525H01M10/058H01M10/42
CPCH01M10/0525H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 彭波吕豪杰殷月辉袁园
Owner WANXIANG 123 CO LTD
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