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A negative electrode of metal lithium secondary battery and application thereof

A secondary battery, metal lithium technology, applied in the field of electrochemical energy storage, can solve the problems of easy detachment of lithium dendrites, no electrochemical activity, decrease in electrode capacity, etc. crystal effect

Active Publication Date: 2020-09-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are many problems in the actual application of lithium metal, because lithium metal is easy to generate lithium dendrites during charging and discharging, and if the generated lithium dendrites continue to grow, they may pierce the diaphragm, causing a short circuit in the battery, and other The lithium dendrites are easy to fall off, forming "dead lithium" that is not electrochemically active, resulting in a decrease in electrode capacity
Therefore, the secondary battery based on metal lithium as the negative electrode has not yet achieved real commercialization.

Method used

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  • A negative electrode of metal lithium secondary battery and application thereof
  • A negative electrode of metal lithium secondary battery and application thereof
  • A negative electrode of metal lithium secondary battery and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of modified graphene composite layer: take 0.5 g of fluorinated graphene and ultrasonically disperse it in 10 ml of ethanol. After suction filtration to form a film, dry at 100°C. The film thickness after drying was 0.1 mm. Then compound with metal lithium sheet.

[0023] figure 1 It can be seen that the battery containing the fluorinated graphene layer is much thinner than the ordinary battery without the fluorinated graphene layer, and the thickness of metal lithium is much thinner. It shows that the battery containing the fluorinated graphene composite layer has good cycle performance, because the irreversible deposition of metal lithium in the cycle process is reduced.

Embodiment 2

[0025] Preparation of modified graphene composite layer: take 0.5 g of chlorinated graphene and ultrasonically disperse it in 10 ml of ethanol. After suction filtration to form a film, dry at 100°C. The film thickness after drying was 0.1 mm. Then compound with metal lithium sheet.

[0026] figure 2 It can be seen that the coulombic efficiency and stability of the battery with the composite fluorinated graphene coating are much better than the comparative test battery. The battery parameters are as follows: the positive pole is a lithium iron phosphate electrode. The active substance load is 15mgcm -2 , the negative electrode is lithium metal. Both the composite fluorinated graphene coating prepared in Example 2 and the diaphragm of the comparative test battery are polypropylene, and the difference is that there is no composite fluorinated graphene coating between the negative electrode and the diaphragm in the comparative test. The discharge rate is 10C, and the cut-of...

Embodiment 3

[0028] Preparation of modified graphene composite layer: 0.5 g of brominated graphene was ultrasonically dispersed in 10 ml of ethanol. After suction filtration to form a film, dry at 100°C. The film thickness after drying was 0.1 mm. Then compound with metal lithium sheet.

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Abstract

The invention relates to an anode of a lithium rechargeable battery. The anode comprises a lithium plate as the anode; a modified graphene layer is arranged on the surface of one side of the lithium plate. The anode of the lithium rechargeable battery can effectively inhibit the metal lithium dendrite. The lithium rechargeable battery with a composite layer, disclosed by the invention, has bettercyclic performance and coulomb efficiency.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a negative electrode of a metal lithium secondary battery. Background technique [0002] Lithium metal, as a negative electrode, has a theoretical specific capacity as high as 3860mAhg-1, and is the negative electrode material with the highest theoretical capacity among lithium secondary battery materials. The original lithium battery was prepared with lithium metal as the negative electrode. For example, in the 1970s and 1980s, Exxon Corporation of the United States and Moli Corporation of Canada respectively introduced secondary batteries with lithium metal as the negative electrode. [0003] However, there are many problems in the actual application of lithium metal, because lithium metal is easy to generate lithium dendrites during charging and discharging, and if the generated lithium dendrites continue to grow, they may pierce the diaphragm, causing a short cir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/36H01M4/38H01M4/587H01M12/06
CPCH01M4/13H01M4/366H01M4/382H01M4/587H01M12/06Y02E60/10
Inventor 曲超张华民张洪章李先锋刘翠连
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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