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Preparation method of ultralow-temperature lithium ion battery which can normally work at temperature of minus 60 DEG C

A lithium-ion battery, normal working technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low mobility of large ions, and achieve the effects of good rate performance, large capacity, and enhanced rate performance

Active Publication Date: 2019-07-05
YANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the limitations of the application of lithium battery materials in low temperature environments and the problems of conventional electrolytes with high viscosity at low temperatures and low ion mobility, and to provide a battery that can be charged and discharged at a large rate at ultra-low temperatures. Lithium-ion battery and preparation method thereof, utilize lithium-ion battery to realize excellent charge and discharge performance at low temperature

Method used

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  • Preparation method of ultralow-temperature lithium ion battery which can normally work at temperature of minus 60 DEG C
  • Preparation method of ultralow-temperature lithium ion battery which can normally work at temperature of minus 60 DEG C

Examples

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Effect test

Embodiment 1

[0033] Preparation of positive electrode material: Weigh 5g of nano-lithium iron phosphate powder, 0.75g of tris buffering agent, and 1.35g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, and mix them Put it into a large beaker and pour 1L of deionized water into it, and stir for 3 hours, and the stirring speed is 1500 rpm. Then add 1 g of dopamine hydrochloride and continue stirring for 24 hours. After the stirring is completed, carry out centrifugal washing, and carry out vacuum drying in a vacuum oven at 100° C. after washing. The described drying time is 8 hours. Carry out carbonization treatment on the dried sample. The carbonization condition is to raise the temperature to 400°C at 1°C / min, keep it warm for 1.5 hours, and then raise the temperature to 800°C at 5°C / min, and keep it warm for 2 hours; the positive electrode material is obtained.

[0034] Preparation of negative electrode material: Weigh polyacrylonitrile and configure it i...

Embodiment 2

[0038] Preparation of positive electrode material: Weigh 5g of nano-lithium iron phosphate powder, 1.5g of tris buffering agent, and 2.7g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, and mix them Put it into a large beaker and pour 1L of deionized water into it, and stir for 5 hours, and the stirring speed is 2000 rpm. Then 2 g of dopamine hydrochloride was added and stirring was continued for 36 hours. After the stirring is completed, carry out centrifugal washing, and carry out vacuum drying in a vacuum oven at 100° C. after washing. The described drying time is 8 hours. Carry out carbonization treatment on the dried sample. The carbonization condition is to raise the temperature to 400°C at 1°C / min, keep it warm for 1.5 hours, and then raise the temperature to 800°C at 5°C / min, and keep it warm for 2 hours; the positive electrode material is obtained.

[0039] Preparation of negative electrode material: Weigh polyacrylonitrile to prepar...

Embodiment 3

[0043] Preparation of positive electrode material: Weigh 5g of nano-lithium iron phosphate powder, 0.75g of tris buffering agent, and 1.35g of polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, and mix them Put it into a large beaker and pour 1L of deionized water into it, and stir for 3 hours, and the stirring speed is 1500 rpm. Then add 1 g of dopamine hydrochloride and continue stirring for 24 hours. After the stirring is completed, carry out centrifugal washing, and carry out vacuum drying in a vacuum oven at 100° C. after washing. The described drying time is 8 hours. Carry out carbonization treatment on the dried sample. The carbonization condition is to raise the temperature to 400°C at 1°C / min, keep it warm for 1.5 hours, and then raise the temperature to 800°C at 5°C / min, and keep it warm for 2 hours; the positive electrode material is obtained.

[0044] Preparation of negative electrode material: Weigh polyacrylonitrile to prepare a 30mL ...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of an ultralow-temperature lithium ion battery which can normally work at the temperature of minus 60 DEG C. The lithium ion battery is prepared by taking the lithium iron phosphate coated with mesoporous carbon as a cathode material and by taking a hard carbon material rich in amesoporous structure prepared by an electrostatic spinning technology as an anode material and is assembled by an electrolyte prepared by a LiTFSi salt and a (Diox+EC+VC) solvent. The battery material has good ion transmission characteristic and quick desolvation of the lithium ions, can keep the performance of the good low-temperature electrolyte in a low temperature, and can ensure that the battery can still work normally at the temperature of minus 60DEG C.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of an ultra-low temperature lithium ion battery normally operating at minus 60°C. Background technique [0002] With the continuous development of battery technology, more and more mechanized and automated products use batteries as a means of driving motors. In recent years, the electric vehicle market has also expanded rapidly, and more and more electric vehicles have been put into operation. It is getting higher and higher, especially in winter, because the temperature is too low for electric vehicles to work, and electric vehicles cannot be used in cold northern regions. In addition, with the development of national defense and scientific research, there are also huge challenges for power supply and energy storage in extremely cold regions. Therefore, research on batteries capable of operating normally at ultra-low temperatures i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M4/62H01M10/0569H01M10/0525H01M10/0585
CPCH01M4/366H01M4/5825H01M4/587H01M4/625H01M10/0569H01M10/0525H01M10/0585H01M2300/004Y02E60/10Y02P70/50
Inventor 丁建宁徐江袁宁一程广贵
Owner YANGZHOU UNIV
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