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An electrolyte promoting carbonate decomposition and a lithium-air battery

A lithium-air battery and electrolyte technology, applied in electrical components, secondary batteries, fuel cell-type half-cells, and secondary-battery-type half-cells, etc., can solve problems such as the inability of catalysts to catalyze

Active Publication Date: 2017-05-10
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the lithium carbonate that is catalyzed is also solid, the catalyst cannot catalyze the decomposition of lithium carbonate that is in poor contact with the catalyst after the decomposition of the lithium carbonate that is in good contact with the catalyst.
[0010] In summary, there is still a lack of lithium-air batteries and methods for efficiently promoting the decomposition of lithium carbonate in the prior art

Method used

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  • An electrolyte promoting carbonate decomposition and a lithium-air battery
  • An electrolyte promoting carbonate decomposition and a lithium-air battery
  • An electrolyte promoting carbonate decomposition and a lithium-air battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Electrolyte No.1 and Li-air battery No.1

[0088] The method of dispersing the catalyst is as follows: 0.005mol / L dinuclear cobalt phthalocyanine (biCoPc) and 1mol / LLiTFSI are dissolved in tetraethylene glycol dimethyl ether (TEGDME) to prepare an electrolyte solution. As a comparison, 0.005 mol / L mononuclear cobalt phthalocyanine (CoPc) and 1 mol / L LiTFSI were dissolved in tetraethylene glycol dimethyl ether (TEGDME) to prepare an electrolyte solution. At the same time, a catalyst-free 1mol / L LiTFSI / TEGDME electrolyte was prepared.

[0089] The method for preparing lithium-lithium carbonate battery is as follows: 0.15g Li 2 CO 3 Add 5mL N-methylpyrrolidone (NMP) with 0.15g Ketjen Black EC600JD high-conductivity carbon black (KB), add 0.026g polyimide (PI) as a binder, and obtain electrode material slurry after magnetic stirring for 2 hours. The material is evenly coated on the surface of the nickel foam, and then the nickel foam coated with the slurry is moved into ...

Embodiment 2

[0093] Electrolyte No.2 and lithium-air battery No.2

[0094] The method of dispersing the catalyst is as follows: 0.005mol / L dinuclear cobalt phthalocyanine (biCoPc) and 1mol / LLiTFSI are dissolved in tetraethylene glycol dimethyl ether (TEGDME) to prepare an electrolyte solution. As a comparison, 0.005 mol / L mononuclear cobalt phthalocyanine (CoPc) and 1 mol / L LiTFSI were dissolved in tetraethylene glycol dimethyl ether (TEGDME) to prepare an electrolyte solution. At the same time, a catalyst-free 1mol / L LiTFSI / TEGDME electrolyte was prepared.

[0095] The method for preparing lithium-lithium carbonate battery is as follows: 1.30~1.50mg isotope-labeled Li 2 13 CO 3 Add 1mL of N-methylpyrrolidone (NMP) to Ketjen Black EC600JD high-conductivity carbon black (KB) at a mass ratio of 1:1, add 5mg of polyimide (PI) as a binder, and obtain electrode material slurry after ultrasonic dispersion for 2 hours The slurry is evenly applied to the surface of nickel foam, and then the ni...

Embodiment 3

[0103] Electrolyte No.3 and lithium-air battery No.3

[0104] The method of dispersing the catalyst is as follows: 0.005mol / L biCoPc and 1mol / L LiClO 4 Dissolved in DMSO, prepared as electrolyte. At the same time, prepare 1mol / L LiClO without catalyst 4 / DMSO electrolyte.

[0105] The method for preparing lithium-carbon dioxide / oxygen battery is as follows: take KB 0.15g, add 0.45mL 6wt% polytetrafluoroethylene (PTFE) emulsion as binder, and 5mL deionized water as dispersant, obtain electrode material after magnetic stirring for 2h Slurry, evenly apply the slurry to the surface of nickel foam, then move the nickel foam coated with slurry into an oven, dry it at 80°C and then move it into a vacuum oven, dry it in vacuum at 120°C for 12 hours, and cut it into pieces with a slicer A disc with a diameter of 14mm is used as the positive pole piece of the lithium-air battery, and the KB load is controlled to be 1±0.2mg / cm 2 . Spread the positive electrode sheet on the pre-drill...

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Abstract

An electrolyte promoting carbonate decomposition and a lithium-air battery are provided. In particular, the electrolyte promoting carbonate decomposition is disclosed and includes a lithium salt, an organic solvent and a catalyst, wherein the catalyst is a double-core or multi-core phthalocyanine transition metal coordination compound. The corresponding lithium-air battery is also disclosed. A solution-phase carbonate decomposition catalytic system is adopted by the lithium-air battery to overcome the bad electric contact between carbonates and solid electrodes, thus effectively reducing decomposition potentials of the carbonates, effectively reducing lithium carbonate accumulation in the lithium-air battery and further improving cyclic performance of the battery.

Description

technical field [0001] The invention relates to the field of lithium-air batteries, and more specifically, to an electrolyte that promotes decomposition of carbonates and a lithium-air battery. Background technique [0002] Lithium-air batteries are energy storage devices with the highest theoretical energy density and are the development direction of chemical power sources. Since the positive active material does not need to be stored inside the battery, the negative active material lithium has the highest specific capacity (3.81Ah g -1 ) and only slightly higher than that of the calcium metal system. Therefore, the theoretical energy density of lithium-air batteries is much higher than that of current lithium-ion batteries, reaching 11680Wh g -1 , which is close to gasoline, is considered to be the ultimate secondary battery. [0003] The composition of the lithium-air battery includes: metal lithium as the negative electrode, a porous electrode made of activated carbon...

Claims

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Application Information

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IPC IPC(8): H01M12/08H01M10/0567
CPCH01M10/0567H01M12/08Y02E60/10
Inventor 刘子萱王德宇彭哲方燕群
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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