All-solid-state polymer electrolyte containing high-concentration lithium salt and preparation method thereof

An all-solid-state polymer and electrolyte technology, which is applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc. High chemical window, simple preparation effect

Inactive Publication Date: 2020-04-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the above patents improve the room temperature ionic conductivity of the polymer electrolyte, the additives added increase the preparation cost, increase the preparation process, prolong the preparation cycle, and reduce the preparation efficiency.
In addition, the safety of the gel polymer electrolyte is greatly reduced due to the liquid component; the composite polymer electrolyte is difficult to prepare due to the use of micro-nano inorganic fillers

Method used

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  • All-solid-state polymer electrolyte containing high-concentration lithium salt and preparation method thereof
  • All-solid-state polymer electrolyte containing high-concentration lithium salt and preparation method thereof
  • All-solid-state polymer electrolyte containing high-concentration lithium salt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of 52wt.% Lithium Salt All-Solid Polymer Electrolyte

[0024] Add 1g polyvinylidene fluoride-hexafluoropropylene, 1.1g lithium salt LiTFSI and 5g solvent N,N-dimethylformamide into the reagent bottle, stir at 65°C for 6h to obtain a uniform solution. The mixed solution was cast on a clean glass plate, scraped with a scraper to form a film, dried under ventilated conditions for 16 hours, and vacuum dried at 60°C for 24 hours to remove residual solvents to obtain an all-solid polymer electrolyte with a thickness of 100 μm.

[0025] The morphology, mechanics and thermal stability analysis of the all-solid-state polymer electrolyte in this example were carried out.

[0026] figure 1 It shows that the lithium salt is uniformly dispersed in the polyvinylidene fluoride-hexafluoropropylene copolymer in the all-solid polymer electrolyte of this example.

[0027] figure 2 It shows that the all-solid polymer electrolyte of this example is flexible.

[0028] imag...

Embodiment 2

[0032] Preparation of 55wt.% Lithium Salt All-Solid Polymer Electrolyte

[0033] Add 1g polyvinylidene fluoride-hexafluoropropylene, 1.2g lithium salt LiTFSI and 5g solvent N,N-dimethylformamide into the reagent bottle, stir at 65°C for 6h to obtain a uniform solution. The mixed solution was cast on a clean glass plate, scraped with a scraper to form a film, dried under ventilated conditions for 16 hours, and vacuum dried at 60°C for 24 hours to remove residual solvents to obtain an all-solid polymer electrolyte with a thickness of 100 μm.

Embodiment 3

[0035] Preparation of 60wt.% Lithium Salt All-Solid Polymer Electrolyte

[0036] Add 1g polyvinylidene fluoride-hexafluoropropylene, 1.5g lithium salt LiTFSI and 5g solvent N,N-dimethylformamide into the reagent bottle, stir at 65°C for 6h to obtain a uniform solution. The mixed solution was cast on a clean glass plate, scraped with a scraper to form a film, dried under ventilated conditions for 16 hours, and vacuum dried at 60°C for 24 hours to remove residual solvents to obtain an all-solid polymer electrolyte with a thickness of 100 μm.

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Abstract

The invention relates to the field of lithium ion batteries and especially relates to an all-solid-state polymer electrolyte containing high-concentration lithium salt and a preparation method thereof. The all-solid-state polymer electrolyte is made of the lithium salt and a polyvinylidene fluoride-hexafluoropropylene copolymer, and a content of the lithium salt is greater than 50wt.%. The preparation method comprises the following steps: (1) uniformly mixing the polyvinylidene fluoride-hexafluoropropylene copolymer, the lithium salt and a solvent to obtain a precursor solution; and (2) coating a clean and smooth substrate with the precursor solution, forming a film under a ventilation condition, and finally carrying out vacuum drying to obtain the all-solid-state polymer electrolyte. Theall-solid-state polymer electrolyte disclosed by the invention is simple to prepare, relatively low in cost, high in room-temperature ionic conductivity, high in electrochemical window and high in lithium ion transference number, and can be used as the electrolyte of a lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an all-solid polymer electrolyte containing high-concentration lithium salt and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long service life, and low environmental pollution. They have been widely used in consumer electronics, such as smartphones and laptops, and have even begun to be used in new energy vehicles and large-scale energy storage power stations. A lithium-ion battery consists of a positive electrode, a negative electrode, and an electrolyte. At present, lithium-ion batteries using liquid electrolytes not only have safety problems such as liquid leakage and spontaneous combustion, but also have limited energy density. Li-ion batteries using solid-state electrolytes can not only address safety issues, but also promise to increase energy density. Solid electrolytes can be divided in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058
CPCH01M10/0565H01M10/058H01M2300/0091Y02E60/10Y02P70/50
Inventor 刘金平易成军刘文燚刘雯聪
Owner WUHAN UNIV OF TECH
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