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Method for preparing hard carbon negative electrode material of ultralow-temperature lithium ion battery and ultralow-temperature lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of slow ion transfer rate, difficult to meet normal use, low charging and discharging efficiency, etc., to avoid environmental pollution, improve Electrochemical performance, low cost effect

Inactive Publication Date: 2021-10-29
扬州华达新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to many factors such as its crystal structure and slow ion transmission rate, the graphite anode material used commercially makes its capacity decay rapidly in low temperature environment, and the charge and discharge efficiency is low, which is difficult to meet the normal use in low temperature environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing a hard carbon negative electrode material for an ultra-low temperature lithium-ion battery is carried out according to the following steps:

[0033] Step 1: Biomass soaking in molten salt

[0034] 1) Weigh 50g of rice husks, wash, dry at 100°C for 12 hours, and then pulverize. Place the obtained pulverized material in a basket made of foamed nickel high-temperature material, and bind it to a molybdenum rod with fine molybdenum wire.

[0035] 2) Weigh sodium carbonate and potassium carbonate at a mass ratio of 1:1, mix them, put them into an alumina crucible and put them into a reactor, and raise the temperature to 750°C under an Ar atmosphere to melt the salt.

[0036] 3) Soak the basket with crushed rice husks in sodium carbonate and potassium carbonate molten salt through a molybdenum rod for 2 hours;

[0037] 4) Lift the basket away from the molten salt, and take it out after cooling to room temperature, and wash the obtained product with wate...

Embodiment 2

[0044] A method for preparing a hard carbon negative electrode material for an ultra-low temperature lithium-ion battery is carried out according to the following steps:

[0045] Step 1: Biomass soaking in molten salt

[0046] 1) Weigh 50g of bamboo leaves, wash, dry at 100°C for 12 hours, and then pulverize. Place the obtained pulverized material in a basket made of high-foam nickel material, and bind it to a molybdenum rod with a fine molybdenum wire.

[0047] 2) Weigh sodium carbonate and potassium carbonate at a mass ratio of 1:1, mix them, put them into an alumina crucible and put them into a reactor, and raise the temperature to 750°C under an Ar atmosphere to melt the salt.

[0048] 3) Through the molybdenum rod, soak the basket containing the pulverized material into sodium carbonate and potassium carbonate molten salt, and the soaking time is 2h;

[0049] 4) Lift the basket away from the molten salt, and take it out after cooling to room temperature, and wash the obt...

Embodiment 3

[0056] A method for preparing a hard carbon negative electrode material for an ultra-low temperature lithium-ion battery is carried out according to the following steps:

[0057] Step 1: Biomass soaking in molten salt

[0058] 1) Weigh 50 g of tree or shrub fallen leaves, wash, dry at 100°C for 12 hours, and then pulverize. Place the obtained pulverized material in a basket made of high-foam nickel material, and bind it to a molybdenum rod with fine molybdenum wire.

[0059] 2) Weigh sodium carbonate and potassium carbonate at a mass ratio of 1:1, mix them, put them into an alumina crucible and put them into a reactor, and raise the temperature to 800°C under an Ar atmosphere to melt the salt.

[0060] 3) Soak the basket with crushed rice husks in sodium carbonate and potassium carbonate molten salt through a molybdenum rod for 2 hours;

[0061] 4) Lift the basket away from the molten salt, and take it out after cooling to room temperature, and wash the obtained product with wa...

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Abstract

The invention discloses a method for preparing an ultralow-temperature lithium ion battery hard carbon negative electrode material and an ultralow-temperature lithium ion battery. The method comprises the following steps: cleaning, drying and crushing biomass, putting the crushed biomass into a basket made of a high-temperature-resistant material, fixing the basket on a high-temperature-resistant rod, and performing soaking treatment in molten salt in an inert atmosphere; and washing, desalting, drying and tabletting the obtained soaked product to serve as an electrolytic cathode, performing electrochemical polarization treatment in high-temperature molten salt, and washing, desalting and drying the obtained electrolytic product to finally obtain the lithium ion battery hard carbon negative electrode material with special morphology. The lithium ion battery hard carbon negative electrode material obtained in the invention has rapid ion transmission capability, and still has excellent cycle performance and rate capability in an ultralow temperature environment. Meanwhile, according to the method, waste is turned into wealth, and the method is good in economic benefit, environmentally friendly and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a hard carbon negative electrode material suitable for ultra-low temperature lithium ion batteries. Background technique [0002] In recent years, with the shortage of fossil fuels and serious environmental pollution, biomass resources have received more and more research attention. Various renewable energy sources such as forestry, agriculture and plants are gradually showing the potential to replace traditional fossil resources. As a biomass resource, it has a large amount of carbon elements, and this unique characteristic makes it a widely and cheap raw material for the preparation of carbon materials. [0003] Lithium-ion batteries with carbon materials as negative electrodes have gradually become the most widely commercialized energy storage devices due to their excellent energy storage performance. In particular, the development of ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05H01M4/587H01M10/0525
CPCC01B32/05H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 尹华意赵竹青骆文彬
Owner 扬州华达新能源有限公司
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