Electrolyte carrier membrane, electrolyte, preparation method of two and lithium ion battery

A technology of electrolyte and carrier film, which is applied in the field of lithium-ion batteries, can solve problems such as poor compatibility of lithium anodes, deterioration of gel electrolyte, and deterioration of mechanical stability, so as to improve compatibility, inhibit dissolution, and reduce polarization Effect

Active Publication Date: 2014-08-06
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the most important problem affecting the practical application of lithium-sulfur batteries is: poor cycle performance
However, after the carrier film absorbs the liquid electrolyte, its mechanical stability becomes poor, resulting in poor gel electrolyte formation and poor compatibility with lithium anodes, which can lead to many serious issues regarding battery safety and cycling.
More importantly, the compatibility of the gel electrolyte carrier film with the liquid electrolyte is poor; and the battery using the gel electrolyte formed by it will also dissolve polysulfides after several cycles, which accelerates the deterioration of battery performance. attenuation

Method used

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  • Electrolyte carrier membrane, electrolyte, preparation method of two and lithium ion battery
  • Electrolyte carrier membrane, electrolyte, preparation method of two and lithium ion battery
  • Electrolyte carrier membrane, electrolyte, preparation method of two and lithium ion battery

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preparation example Construction

[0064] For the preparation methods of other mesoporous oxide particles, refer to the preparation method of the above mesoporous silicon oxide particles, and details will not be repeated here!

[0065] The electrolyte carrier membrane of the present invention is a microporous membrane, on which many fine pores are distributed, and the liquid electrolyte can be absorbed in the pores.

[0066] Among them, the matrix polymer is selected to have certain mechanical properties, chemical stability, electrochemical stability, and a polymer with good affinity with the electrolyte.

[0067] The matrix polymer of the present invention includes polyvinylidene fluoride-hexafluoropropylene copolymer PVDF-HFP and organosilane-substituted polymethyl methacrylate PMMA.

[0068] Polymethyl methacrylate PMMA substituted by organosilane has a high degree of crosslinking. Introducing it into the matrix polymer can make the distribution of pores more uniform, effectively improve the electrolyte abso...

Embodiment 1

[0116] Matrix polymer: 70wt% PVDF-HFP and 30wt% trimethoxysilane substituted polymethyl methacrylate f-PMMA.

[0117] The BET specific surface area of ​​mesoporous silica particles is 804.15m 2 / g, pore volume 0.86cm 3 / g, the average pore size is 3.83nm, and the particle size range is 200-400nm.

[0118] Preparation of electrolyte carrier membrane:

[0119] Add 85wt% matrix polymer and 15wt% mesoporous silica particles into the organic solvent acetone, and stir for 24h. Then ultrasonic treatment was performed for 1 h to form a uniform dispersion system at room temperature. Then add tert-butyl methyl ether, a pore-forming agent, and stir evenly to form a uniform dispersion system.

[0120] Pour the above dispersion into a clean vessel. After natural air-drying of the organic solvent acetone and tert-butyl methyl ether as a pore-forming agent, they were finally further dried in a vacuum oven at 65 °C for 24 h to remove the residual solvent and pore-forming agent. An elect...

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Abstract

The invention belongs to the field of batteries, and concretely discloses an electrolyte carrier membrane. The electrolyte carrier membrane comprises a substrate polymer and mesoporous inorganic oxide particles, and the substrate polymer comprises poly(vinylidenefluoride-co-hexafluoro propylene) and organosilane-substituted polymethyl methacrylate. The invention also discloses an electrolyte which comprises the electrolyte carrier membrane and a liquid electrolyte adsorbed by the electrolyte carrier membrane. The invention also discloses preparation methods of the electrolyte carrier membrane and the electrolyte and a lithium ion battery. The provided electrolyte carrier membrane is good in pore uniformity, good in mechanical properties after a liquid is adsorbed, and good in compatibility with the electrolyte. The provided electrolyte is capable of effectively improving the capacity and the cycle performance of lithium-sulfur batteries.

Description

technical field [0001] The invention relates to a lithium ion battery. [0002] The invention also relates to an electrolyte carrier film and a preparation method thereof. [0003] The invention also relates to an electrolyte and a preparation method thereof. Background technique [0004] Sulfur is a promising cathode material for rechargeable lithium batteries due to its high theoretical specific capacity of 1672mAh / g and specific energy of 2600Wh / Kg (assuming complete reaction of lithium with sulfur). Such a high specific energy is 3-5 times that of conventional Li-ion rechargeable batteries based on intercalation chemistry. Compared with other positive electrode materials of 3.0-4.0V, it has a relatively low operating voltage of about 2.1V, thus ensuring the safety of battery packaging. Furthermore, sulfur is abundant, non-toxic, and can be used to produce cheap and safe high-energy batteries. [0005] At present, the most important problem affecting the practical app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCY02E60/122H01M10/0525H01M10/0565H01M10/058Y02E60/10
Inventor 卡赞姆·杰迪陈璞
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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