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High-energy-density Li-air battery air electrode, and battery and making method thereof

A lithium-air battery and air electrode technology, applied in the field of electrochemistry, can solve the problems of high thermal conductivity, poor cycle performance, low discharge capacity, etc., achieve high chemical performance and safety performance, and increase the effect of catalytic reaction efficiency

Active Publication Date: 2013-09-04
深圳市集创云天新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defects of low actual discharge capacity and poor cycle performance of lithium-air batteries in the prior art, and provide a lithium-air battery air electrode, which includes a catalyst, a carrier and a binder; The carrier has high thermal conductivity (~5000W / m.k), high specific surface area (2630m 2 / g) and high conductivity (10 3 ~10 4 SM -1 ) nanographene and SiO 2 Airgel composite dual-porous system material; its unique two-dimensional nanostructure provides double-sided channels for the diffusion of electrolyte and oxygen, which can form an ideal three-phase electrochemical region and increase the efficiency of catalytic reactions

Method used

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  • High-energy-density Li-air battery air electrode, and battery and making method thereof

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Embodiment 1

[0037] The preparation method of nano-graphene used in the present invention is as follows, in addition, nano-graphene prepared by other methods is also suitable for the present invention. SiO used in the present invention 2 Aerogels are commercially available.

[0038] S1. Nanographene and SiO 2 Preparation of airgel composite dual-porous system material:

[0039] S11. Add concentrated sulfuric acid (230ml, 98%) and sodium nitrate 5g in the 1000ml beaker, mechanically stir in ice-water bath for 15 minutes to obtain mixed acid;

[0040] S12. Take 10g of natural graphite or artificial graphite and add it, after stirring for 10 minutes, gradually add 30g of potassium permanganate powder, the addition speed is 5g / 5min, control the reaction temperature not to exceed 20°C, and then place the beaker at 35°C In a constant temperature water bath, stir evenly.

[0041] S13. After constant temperature reaction for 2 hours, add 500ml of deionized water, control the reaction tempe...

Embodiment 2

[0060] The difference between this embodiment and embodiment 1 is: the lithium electrode material is a lithium alloy; the catalyst is: MnO 2 and Pt; the binder is polyethylene; the non-aqueous electrolyte is: 30% LiSO 3 CF 3 And 70%PC / TFP mixed solution; Diaphragm is: polyethylene nanofiltration membrane; Other modes are identical with embodiment 1.

[0061] The energy density of the battery described in this embodiment is 10000Wh / kg (calculated by carbon), the capacity is up to 8412.3mAh / g (calculated by carbon), and it can be charged and discharged more than 100 times. Energy density and capacity remain largely unchanged.

Embodiment 3

[0063] The difference between this embodiment and 1 is: the lithium electrode material is a lithium alloy: the catalyst is: Mn 2 o 3 and Pt; the binder is polypropylene; the non-aqueous electrolyte is: 30% LiSO 3 CF 3 And 70%PC / TTFP; Diaphragm is: polypropylene nanofiltration diaphragm; Other modes are identical with embodiment 1.

[0064] The energy density of the battery described in this embodiment is 10000Wh / kg (calculated by carbon), the capacity is up to 8133.3mAh / g (calculated by carbon), and it can be charged and discharged more than 100 times. Energy density and capacity remain largely unchanged.

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Abstract

The invention belongs to the chemical power supply field, and concretely relates to a high-energy-density Li-air battery air electrode, and a battery and a making method thereof. The air battery is a non-aqueous chargeable Li-air (or Li / O2) battery concretely, and comprises a lithium metal negative electrode, a non-aqueous electrolyte, a diaphragm and the air electrode, the air electrode comprises a catalyst, a carrier and a binder, and the carrier is a composite double pore system material composed of nano-graphene having a two-dimensional nanostructure, a high heat conduction coefficient (-5000W / m.k), a high specific surface area (-2630m<2> / g) and a high electrical conductivity (10<3>-10<4>Sm<-1> and an SiO2 aerogel, provides a circulation channel and a storage space for O2 and discharge reaction products respectively, and adopts a double-surface electrode structure; and the non-aqueous electrolyte adopts a lithium salt and organic solvent mixed electrolyte, and has the advantages of high electrical conduction, low volatility, good chemical stability and the like. The oxygen-selective diaphragm is added to the air battery to increase the pressure of O2 in a reaction area and prevent water in air from entering the battery, so the metallic lithium is effectively protected, and the safety of the battery is increased.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, and more specifically relates to an air electrode of a lithium-air battery with high energy density, the battery and a preparation method. Background technique [0002] A lithium-air battery is a battery that uses lithium as the anode and oxygen in the air as the cathode reactant. The discharge process is as follows: the lithium at the anode releases electrons and becomes Li + , Li + Through the electrolyte material, it combines with oxygen and electrons flowing from the external circuit at the cathode to form lithium oxide (Li 2 O) or lithium peroxide (Li 2 o 2 ), and stay at the cathode. The opposite reaction occurs during charging to release oxygen. Both reactions take place on the surface of the carbon electrode. [0003] Lithium-air batteries have higher specific energy than lithium-ion batteries. In theory, since oxygen is not limited as a cathode reactant, the capacity of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88
CPCY02E60/50
Inventor 李军梁景文
Owner 深圳市集创云天新材料有限公司
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