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A lithium-oxygen battery

A technology of lithium-oxygen battery and lithium negative electrode, applied in battery pack parts, battery box/jacket, large-sized battery/battery pack, etc., can solve the problems of accelerated battery failure, unstable lithium negative electrode, poor cycle stability, etc. , to protect the lithium metal anode, avoid additive depletion, and achieve high cycle reversibility.

Active Publication Date: 2017-12-15
SUZHOU DISIFU NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing organic electrolyte for lithium-oxygen batteries is not stable to the lithium negative electrode, and it will corrode metal lithium during the battery cycle, and also cause the electrolyte to decompose itself
This process leads to low coulombic efficiency and poor cycle stability of lithium metal anode, which accelerates the failure of the whole battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] see figure 1 , a lithium-oxygen battery according to the present invention, comprising a casing 1, a porous lithium negative electrode 2 disposed in the casing 1, a porous positive electrode 3, and a porous lithium negative electrode 2 disposed between the porous lithium negative electrode 3 and the porous positive electrode 3. The diaphragm 4 has an electrolyte solution. In this embodiment, the electrolyte solution is preferably added dropwise. The electrolyte solution can be selected from ether solvents including tetraethylene glycol dimethyl ether and triethylene glycol dimethyl ether. The lithium salt can be selected from lithium perchlorate, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium nitrate and the like. The molar ratio of solvent to lithium salt is between 1-8:1. In this embodiment, an electrolyte solution with a molar ratio of tetraethylene glycol dimethyl ether to lithium trifluoromethanesulfonate of 4:1 is preferred....

Embodiment 2

[0031] All the other structures of the lithium-oxygen battery are the same as in Example 1, except that:

[0032] The porous positive electrode in Example 1 was replaced with a porous metal lithium sheet, and the porous positive electrode current collector was replaced by a foamed copper current collector from an aluminum mesh current collector, thereby converting the lithium-oxygen battery into a lithium-lithium battery.

[0033] Put the above-mentioned modified lithium-lithium battery in a bottle filled with pure oxygen for charge and discharge test. In addition, a reference battery without opening holes for oxygen to enter the battery at the negative and positive electrodes participated in the test together, and the following results were obtained: image 3 the results described. At a current density of 0.2mA / cm 2 In this case, the time for lithium metal deposition and dissolution was controlled within 5 hours. As the cycle progressed, the overpotential of the battery wit...

Embodiment 3

[0035] The rest of the structure of the lithium-oxygen battery is the same as that of Example 2, except that the porous metal lithium sheet and the foamed copper current collector on one side of the lithium-oxygen battery described in Example 2 are replaced with a copper mesh so that the lithium-lithium battery is converted into Lithium-copper battery. In this embodiment, a certain capacity of lithium metal is deposited on the copper grid, and then the deposited lithium is dissolved, and the coulombic efficiency of lithium in the cycle process can be known by calculating the ratio of the dissolved lithium to the deposited lithium. In the experiment, the diameter of the electrode sheet we used was 12mm, and the amount of deposited metal lithium was 1mAh / cm 2 , The charging cut-off potential is 1.0V. The lithium-oxygen battery in this embodiment is placed in a bottle full of pure oxygen for testing, and the following results are obtained: Figure 4 The cycle graph shown. It c...

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Abstract

The invention relates to a lithium-oxygen battery. The battery includes shell bodies, a porous lithium anode in the shell, a porous cathode in the shell bodies, and a separating membrane disposed between the porous lithium anode and the porous cathode and provided with an electrolyte. The battery is characterized in that the battery also includes a porous anode current collector and a porous cathode current collector; the porous anode current collector, the porous lithium anode, the separating membrane provided with the electrolyte, the porous cathode and the porous cathode current collector are laminated in order; the shell body close to the porous cathode side and the shell body close to the porous lithium anode side are stainless steel shell bodies; and the stainless steel shell bodies close to the porous cathode side and the porous lithium anode side respectively are provided with a plurality of through holes from which oxygen can enter. The metal lithium anode is protected by introducing oxygen so that oxygen reacts with the metal lithium preferentially to form a dense SEI film layer rich in lithium oxide and lithium peroxide on the surface of the metal lithium, thus inhibiting metal lithium anode corrosion caused by the electrolyte, and significantly increasing cyclic stability and the coulombic efficiency of the lithium anode.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-oxygen battery. Background technique [0002] With the continuous advancement of science and technology, lithium batteries as energy storage devices have developed rapidly. Among them, organic lithium-oxygen batteries have attracted great attention from scientific research and industry due to their huge theoretical specific energy density, and are a strong competition for the next generation of high-energy batteries. By. For this kind of battery to be practically applied, a metal lithium anode with high coulombic efficiency and cycle stability is required (coulombic efficiency refers to the ratio of dissolved lithium to deposited lithium during the deposition-dissolution process of lithium metal). [0003] The existing organic electrolyte for lithium-oxygen batteries is not stable to the lithium negative electrode, and will corrode metal lithium during the battery cy...

Claims

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Application Information

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IPC IPC(8): H01M12/08H01M2/02H01M50/10
CPCH01M12/08H01M50/10Y02E60/10
Inventor 何平周豪慎邱飞龙王胜
Owner SUZHOU DISIFU NEW ENERGY TECH CO LTD
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