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Preparation method of flexible quick-charging lithium metal battery

A lithium metal battery, flexible technology, applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve problems such as the difficulty in meeting bendable electronic devices, reduced Coulomb efficiency, battery safety issues, etc., to inhibit dendrite growth , high energy density, and life-enhancing effect

Inactive Publication Date: 2017-09-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the 1990s, after Sony Corporation developed commercial lithium-ion batteries using graphite negative electrodes based on intercalation reactions, lithium-ion batteries quickly occupied high-end electronic devices such as notebook computers and mobile phones. Lithium-ion batteries have been developed for nearly 30 years, and it is difficult to To meet the current needs of people for long-time standby and bendable electronic devices
[0003] During the charging and discharging process of metal lithium batteries, lithium dendrites are easily generated on the negative electrode side. Due to the loose structure, some dendrites will break away from the conductive framework to form "dead lithium" that cannot be used anymore, resulting in a decrease in Coulombic efficiency and loss of lithium sources; in addition, Lithium dendrites may puncture the separator, causing battery safety problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Configure N-methylpyrrolidone solution with a mass concentration of 0.1g / L graphene and 0.01g / L polyvinylidene fluoride, ultrasonically, apply it on the surface of copper foil, and compound it with lithium metal to obtain lithium by hot-melt method -The thickness of the graphene composite electrode is 50 μm as the negative electrode matches the composite electrolyte composed of flexible lithium iron phosphate paper and ethylene oxide and lithium bistrifluoromethanesulfonylimide. After testing, it is found that the Coulomb of the flexible and fast-charging lithium metal battery The efficiency can reach 99.0%, and the cycle life can reach 1000 circles.

Embodiment 2

[0024] Embodiment 2: Configure carbon nanotubes with a mass concentration of 1g / L and a diameter of 2nm, 1g / L of polyvinylidene fluoride in N,N-dimethylformamide solution, ultrasonically, coated on the surface of aluminum foil, and pass through with lithium metal The lithium-carbon nanotube composite electrode obtained by electrodeposition method has a thickness of 100 μm and is used as the negative electrode to match the composite electrolyte composed of flexible lithium iron phosphate paper and ethylene oxide and lithium hexafluorophosphate. After testing, it was found that the coulombic efficiency of the flexible and fast-charging lithium metal battery It can reach 99.6%, and the cycle life can reach 800 circles.

Embodiment 3

[0025] Embodiment 3: Configure the mixture of carbon nanotubes with mass concentration 4g / L graphene and diameter 10nm according to mass ratio 1:1, the N-ethylpyrrolidone industry of 20g / L polyvinylidene fluoride, ultrasonic, be coated on copper Foil surface, combined with lithium metal by rolling method to obtain lithium-graphene-carbon nanotube composite electrode with a thickness of 200 μm as negative electrode and flexible lithium iron phosphate paper and polyethylene oxide, lithium lanthanum zirconium oxide and lithium hexafluoroarsenate The composition of the composite electrolyte is matched. After testing, it is found that the coulombic efficiency of the flexible and fast-charged lithium metal battery can reach 98.0%, and the cycle life can reach 1200 cycles.

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Abstract

The invention discloses a preparation method of a flexible quick-charging lithium metal battery and belongs to the technical field of lithium batteries. The method comprises the steps of firstly mixing an organic solution of graphene and a carbon nanotube and a binder, and coating the surface of a current collector to prepare a self-supporting pole piece; compounding the self-supporting pole piece and a lithium metal to prepare a lithium-graphene composite electrode or a lithium-carbon nanotube composite electrode or lithium-graphene-carbon nanotube composite electrode; and adopting flexible lithium iron phosphate paper as a positive electrode, composite electrolyte as a diaphragm and the composite electrode as a negative electrode, and assembling to obtain the flexible quick-charging lithium metal battery. The method is simple in operation and significant in effect. The graphene and carbon nanotube skeleton has a high specific surface area, and is capable of effectively reducing the local current density, endowing the electrode with flexible characteristics and achieving fast ion transportation; and the graphene and carbon nanotube skeleton is capable of promoting uniform lithium deposition and inhibiting growth of lithium dendrites, thereby achieving the flexible quick-charging lithium metal battery.

Description

field of invention [0001] The invention relates to a method for preparing a flexible and fast-charging lithium metal battery, belonging to the technical field of lithium metal batteries. Background technique [0002] As people's material living standards are getting higher and higher, the demand for energy is increasing rapidly, which promotes the rapid development of energy storage, especially battery technology. In the 1990s, after Sony Corporation developed commercial lithium-ion batteries using graphite negative electrodes based on intercalation reactions, lithium-ion batteries quickly occupied high-end electronic devices such as laptops and mobile phones. Lithium-ion batteries have been developed for nearly 30 years, and it is difficult to It satisfies people's current demand for long-time standby and bendable electronic devices. With the proposal of the national new energy strategy, new energy electric vehicles have developed rapidly. However, commercial lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/134H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/134H01M4/366H01M4/382H01M4/625H01M4/628H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 陈筱薷张强程新兵黄佳琦
Owner TSINGHUA UNIV
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