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Ether electrolyte and lithium air battery

An electrolyte and ether technology, applied in the field of lithium-air batteries, can solve the problems of poor long-term cycle stability of lithium-air batteries, affecting the performance of lithium-air batteries, oxidation decomposition, etc., and achieve excellent chemical stability, excellent Coulombic efficiency and rate performance , the effect of high oxygen solubility

Inactive Publication Date: 2014-08-20
常州盈华高科储能材料科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The results show that this type of electrolyte degrades significantly during the reaction process, generating a large amount of by-products such as carbonates and alkyl carbonates, and the gas released during the charging reaction is mainly CO 2 , instead of O 2 , seriously affecting the performance of lithium-air batteries
Later, researchers developed acetonitrile electrolytes and sulfone electrolytes, but acetonitrile electrolytes are extremely volatile; sulfone electrolytes decompose at the end of charging to produce carbonate by-products, which cannot be used in subsequent charging reactions. Complete oxidative decomposition, accumulation on the electrode surface with the cycle process, making the long-term cycle stability of lithium-air batteries poor

Method used

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Examples

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preparation example Construction

[0036]The present invention provides a kind of preparation method of ether electrolyte, preferably comprises the following steps:

[0037] The lithium salt and the organic solvent are mixed, stirred, and left to stand to obtain an ether electrolyte.

[0038] In the present invention, the types and sources of the lithium salt and the organic solvent are consistent with the types and sources of the lithium salt and the organic solvent described in the above technical solution, and will not be repeated here.

[0039] In the present invention, the mixing temperature of the lithium salt and the organic solvent is preferably 10°C to 50°C, more preferably 15°C to 45°C, most preferably 20°C to 30°C; the mixing time is preferably 1 min to 15min, more preferably 5min to 10min; the stirring temperature is preferably 10°C to 50°C, more preferably 15°C to 45°C, most preferably 20°C to 30°C; the stirring time is preferably 0.5h to 2h, more preferably 1h-1.5h; the stirring rate is preferabl...

Embodiment 1

[0059] In a glove box filled with high-purity argon, weigh 2.8709g LiN(SO 2 CF 3 ) 2 , take 10mL tetraethylene glycol dimethyl ether (TEGDME) with a pipette gun, make a mixed solution, stir evenly and let it stand for 2h to obtain an ether electrolyte;

[0060] Using Super P Li carbon as the positive electrode, metal lithium sheet as the negative electrode, glass fiber membrane as the diaphragm, and the ether electrolyte prepared above as the electrolyte, a lithium-air battery was assembled in a glove box filled with argon. The above-mentioned test battery was subjected to a constant current charge and discharge test in pure oxygen at a current density of 50 mA / g at room temperature, and the charge and discharge cut-off voltage was 2.0V-4.5V.

[0061] figure 1 It is the first charge and discharge curve diagram of the lithium-air battery obtained in Example 1 of the present invention, wherein, curve 1 is the charging process, and curve 2 is the discharging process. from fi...

Embodiment 2

[0065] In a glove box filled with high-purity argon, weigh 2.8709g LiN(SO 2 CF 3 ) 2 , take 10mL ethylene glycol dimethyl ether (DME) with a pipette gun, make a mixed solution, stir it evenly and let it stand for 2 hours to obtain an ether electrolyte;

[0066] Using Super P Li carbon as the positive electrode, metal lithium sheet as the negative electrode, glass fiber membrane as the diaphragm, and the ether electrolyte prepared above as the electrolyte, a lithium-air battery was assembled in a glove box filled with argon.

[0067] The above battery was subjected to a constant current charge and discharge test in pure oxygen at a current density of 100 mA / g at room temperature, and a cycle performance test was performed with a limited charge and discharge capacity of 1000 mAh / g. image 3 It is the lithium-air battery charge-discharge curve graph that the embodiment 2 of the present invention obtains, It is the charge and discharge curve of the first cycle; It is the cha...

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Abstract

The invention provides ether electrolyte. The ether electrolyte comprises lithium salt and an organic solvent, wherein the organic solvent comprises one or more of 1,2-dimethoxyethane, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether and tetraethylene glycol dimethyl ether. The ether electrolyte has advantages that the ether electrolyte is unlikely to volatize, the oxygen dissolving degree is high, the electrochemical stable window is wide, and the like, and has excellent chemical stability for a discharging intermediate product O2<-1> or LiO2 and a discharging final product Li2O2. The lithium air battery prepared by utilizing the ethers electrolyte is excellent in long cycling stability. The experimental result shows that a charging-discharging curve is not obviously changed after the lithium air battery assembled by utilizing the ether electrolyte is circularly charged and discharged for 30 times at a limit capacity of 1,000mAh / g under the current density of 100mA / g.

Description

technical field [0001] The invention belongs to the technical field of lithium-air batteries, and in particular relates to an ether electrolyte and a lithium-air battery. Background technique [0002] Lithium-air batteries are batteries that use lithium metal or lithium compounds as the negative electrode active material and oxygen as the positive electrode active material, and can be repeatedly charged and discharged. The electrode reaction during charging and discharging is as follows: [0003] Negative electrode reaction during discharge: Li→Li + +e - ; [0004] Positive reaction: O 2 +2Li + +2e - → Li 2 o 2 ; [0005] Negative reaction during charging: Li + +e - → Li; [0006] Positive reaction: Li 2 o 2 →O 2 +2Li + +2e - . [0007] Compared with the current mature lithium-ion battery technology, the mass energy density of lithium-air batteries is 3 to 5 times that of lithium-ion batteries. Lithium-air batteries have attracted the attention of battery ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/08
CPCH01M12/06H01M2300/0028Y02E60/10
Inventor 彭章泉王佳伟马力坡
Owner 常州盈华高科储能材料科技有限公司
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