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Composite solid electrolyte prepared based on in-situ thermal polymerization method and preparation method and application thereof

A solid-state electrolyte and thermal polymerization technology, which can be used in composite electrolytes, electrolyte battery manufacturing, electrolytes, etc., can solve problems such as increasing the production cost of lithium-ion batteries, achieve good application prospects, facilitate migration, and improve the effect of utilization.

Inactive Publication Date: 2020-12-01
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process, the composite solid electrolyte membrane needs to go through processes such as casting, drying, film winding and film removal, which have high requirements on the operating environment and equipment, which increases the production cost of lithium-ion batteries.

Method used

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  • Composite solid electrolyte prepared based on in-situ thermal polymerization method and preparation method and application thereof
  • Composite solid electrolyte prepared based on in-situ thermal polymerization method and preparation method and application thereof
  • Composite solid electrolyte prepared based on in-situ thermal polymerization method and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]In an argon glove box, mix 2 g of lithium difluorooxalate borate LiDFOB, 0.01 g of azobisisobutyronitrile AIBN, 10 ml of vinylene carbonate and 3 ml of ethylene carbonate EC, stir magnetically until completely dissolved, and then add 2 g garnet-type oxide electrolyte Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 , Magnetic stirring to disperse evenly in the solution.

[0039] Lithium-ion button batteries were assembled in an argon glove box, and the positive electrode was made of lithium iron phosphate, Li 6.4 La 3 Zr 1.4 Ta 0.6 o 12 , Super P and PVDF are composed in a mass ratio of 75:9:10:6, and the negative electrode is lithium metal. During the assembly process, 1 ml of the above electrolyte solution is added, and the seal is sealed after the assembly is completed. The battery was left standing at room temperature for 12 hours to ensure that the electrolyte and electrode materials were fully infiltrated, and then kept at 60°C for 6 hours to allow in-situ polymerization of...

Embodiment 2

[0041] In an argon glove box, mix 1 g of lithium difluorooxalate borate LiDFOB, 1 g of lithium bistrifluoromethanesulfonimide LiTFSI, 0.02 g of benzoyl peroxide BPO, 10 mL of vinylene carbonate, and 1.6 mL of carbonic acid Methyl ethyl ester EMC mixed, magnetically stirred until completely dissolved, then added 3.5 grams of sulfide electrolyte 70Li 2 S·30P 2 S 5 , Magnetic stirring to disperse evenly in the solution.

[0042] Assemble a lithium-ion button battery in an argon glove box, and the positive electrode is made of lithium iron phosphate, 70Li 2 S·30P 2 S 5 , Super P and PVDF are composed in a mass ratio of 75:9:10:6, and the negative electrode is lithium metal. During the assembly process, 1 ml of the above electrolyte solution is added, and the seal is sealed after the assembly is completed. The battery was left standing at room temperature for 24 hours to ensure that the electrolyte and electrode materials were fully infiltrated, and then kept at 50°C for 24 ho...

Embodiment 3

[0044] In an argon glove box, 2 grams of lithium difluorooxalate borate LiDFOB, 2 grams of lithium hexafluorophosphate LiPF 6 , 0.02 g of azobisisoheptanonitrile ABVN, 10 ml of vinylene carbonate and 4 ml of dimethyl carbonate DMC were mixed, magnetically stirred until completely dissolved, and then 6 g of NASICON type electrolyte Li was added 1.3 al 0.3 Ti 1.7 P 3 o 12 , Magnetic stirring to disperse evenly in the solution.

[0045] Lithium-ion button batteries were assembled in an argon glove box, and the positive electrode was made of lithium iron phosphate, Li 1.3 al 0.3 Ti 1.7 P 3 o 12 , Super P and PVDF are composed in a mass ratio of 75:9:10:6, and the negative electrode is lithium metal. During the assembly process, 1 ml of the above electrolyte solution is added, and the seal is sealed after the assembly is completed. The battery was left to stand at room temperature for 18 hours to ensure that the electrolyte and electrode materials were fully infiltrated, a...

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Abstract

The invention discloses a composite solid electrolyte, an in-situ preparation method thereof and an application of the composite solid electrolyte in a solid lithium ion battery. The composite electrolyte is composed of an inorganic solid electrolyte, polyvinyl carbonate, a lithium salt, a small molecular organic solvent and an initiator. Vinylene carbonate is subjected to in-situ polymerization through temperature adjustment, and an electrolyte is fully infiltrated with positive and negative electrode materials, so that the interface compatibility of the electrolyte and an electrode is improved, and the interface impedance is reduced; the inorganic solid electrolyte and the small molecular organic solvent are added as plasticizers, so that the ionic conductivity of the electrolyte can beimproved, an additional lithium conduction channel is provided, and the performance of the solid lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a composite solid electrolyte prepared based on an in-situ thermal polymerization method with high lithium ion conductivity, good contact with an electrode interface, and a simple process, as well as a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have been widely used in energy storage, power and 3C consumer fields due to their high energy density, good cycle performance, and environmental protection. Lithium-ion batteries generally use organic electrolytes, which are prone to leakage, combustion, and explosion of electrolytes under conditions such as overcharge, short circuit, and impact. Solid-state lithium-ion batteries use solid-state electrolytes instead of organic electrolytes, do not contain flammable and volatile components, have a wide electrochemical stability window, have good compatibility with metal lithium a...

Claims

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Application Information

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IPC IPC(8): H01M10/0561H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0561H01M10/0565H01M10/058H01M2300/0088H01M2300/0091Y02E60/10Y02P70/50
Inventor 屠芳芳张文王羽平黄汉川张焱刘桃松陈冬相佳媛陈建
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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