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Flexible solid-state lithium ion conductor applied to battery and preparation method thereof

An ionic conductor and solid lithium technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low conductivity, achieve the effect of improving exercise ability and ensuring transmission ability

Active Publication Date: 2019-06-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to organic lithium salts and inorganic lithium salts, lithium single-ion conductors are also solid lithium-ion conductors, and some single-ion conductors are polymers, but the conductivity of single-ion conductor polymers is generally low at present, and the ion conductivity at room temperature is 10 -5 ~10 -8 Within the range of S / cm

Method used

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  • Flexible solid-state lithium ion conductor applied to battery and preparation method thereof
  • Flexible solid-state lithium ion conductor applied to battery and preparation method thereof
  • Flexible solid-state lithium ion conductor applied to battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) The polymer is grafted polyvinyl formal with lithium monooxalate borate, and the structural formula is as follows, where x:y = 4. Weigh 0.4305 g of the above polymer and dissolve it in 2.583 g of dimethyl sulfoxide, stir well to completely dissolve it.

[0027]

[0028](2) Continue to add 0.031g of boron-containing organolithium salt LiODFB (relative molecular weight 144), corresponding to the general structure R 1 The molar ratio of (1,3-dioxane) to lithium ions of the organolithium salt LiODFB was 15:1 to form a solution.

[0029] (3) Then the solution was heated to 70°C and stirred for 24 hours to obtain a slurry, which was then uniformly coated on a glass plate and dried in vacuum at 50°C for 24 hours to obtain a flexible solid lithium ion conductor.

[0030] The microscopic appearance of the flexible solid-state lithium ion conductor obtained in Example 1 is as follows: figure 1 As shown, it can be seen from the figure that the lithium ion conductor is a d...

Embodiment 2

[0038] (1) The polymer is grafted polyvinylidene fluoride with lithium benzenesulfonate, and the structural formula is as follows, where x: y= 1.2:1. Take 0.7231 g of the above polymer and dissolve it in 3.32 g of acetonitrile, stir well to make it dissolve completely.

[0039]

[0040] (2) Continue to add 0.054g of organic lithium salt LiBETI (relative molecular weight 387) with sulfonimide group, corresponding to the general structure R 1 The (-CH 2 -CF 2 -) with the organolithium salt LiBETI lithium ions in a molar ratio of 50:1 to form a solution.

[0041] (3) Then the solution was heated to 40° C. and stirred for 30 h to obtain a slurry. Finally, the slurry was vacuum-dried at 60 °C for 36 h to obtain a flexible solid-state Li-ion conductor.

[0042] The AC impedance test result of the flexible solid-state lithium ion conductor obtained in embodiment 2 is as follows image 3 As shown, at a room temperature of 25 °C, the room temperature conductivity of the lithium...

Embodiment 3

[0049] (1) The polymer is grafted polyethylene carbonate with perfluoroalkylcarboxylithium, and the structural formula is as follows, where x:y =2.4:1. Weigh 0.6471 g of the above polymer and dissolve it in 2.983 g of tetrahydrofuran, stir well to completely dissolve it.

[0050]

[0051] (2) Continue to add 0.151g organolithium salt ddCTP-Li containing phosphoric acid group 3 (relative molecular mass 469), corresponding to the general structure R 1 of (-O-CO-O-CH 2 -) with organolithium salt ddCTP-Li 3 The molar ratio of lithium ions is 10:1, forming a solution.

[0052] (3) Then the solution was heated to 120 °C and stirred for 2 h to obtain a slurry, which was evenly coated on a glass plate, and finally vacuum-dried at 60 °C for 36 h to obtain a flexible solid lithium ion conductor.

[0053] The obtained solid lithium ion conductor of embodiment 3 has good flexibility; Tensile strength-strain curve is as follows Figure 7 As shown, its mechanical strength is as high...

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Abstract

The invention provides a flexible solid-state lithium ion conductor and a preparation method thereof, belonging to the technical field of energy storage and conversion materials. The flexible lithiumion conductor comprises at least two components containing lithium ions, wherein one component is an inorganic or organic lithium salt, and the other component is a polymer; and the main chain of thepolymer has at least one of an ether oxygen bond, a carbon nitrogen single bond, a carbon oxygen double bond or a silicon oxygen bond, and contains lithium ions coordinated by ionic bonds. The solid-state lithium ion conductor provided by the invention is a flexible body with plasticity, the room temperature ionic conductivity is greater than 10<-4> S / cm, and the lithium ion migration number is greater than 0.4. The flexible solid-state state lithium ion conductor provided by the invention is applied to a solid-state battery including a lithium ion battery, a metal lithium battery, a lithium sulfur battery and a lithium air battery; the flexible solid-state state lithium ion conductor provided by the invention can be introduced as an adhesive into an electrode or as a solid-state electrolyte at the same time due to the high lithium ion conductivity, high tensile strength and certain plastic deformation ability, which exhibits excellent interface stability and cycle life.

Description

technical field [0001] The invention belongs to the technical field of energy storage and conversion materials, in particular to a flexible solid-state lithium ion conductor and a preparation method, and its application in batteries as a binder and an electrolyte. Background technique [0002] Lithium ion conductor is a substance that can conduct lithium ions but is electronically insulated. It is an important medium for lithium ion conduction in lithium ion batteries, lithium metal batteries, lithium sulfur batteries and lithium air batteries, and is a key material to ensure the normal operation of batteries. At present, the commonly used lithium ion conductors are in liquid state, and the lithium ion migration rate in the liquid system is fast and the conductivity is high (≥10 -3 S / cm), and the liquid lithium ion conductor has fluidity and can infiltrate the porous electrode, so as to build a continuous channel for lithium ion conduction in the battery, so the liquid li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0565
CPCY02E60/10
Inventor 连芳李昊张红男熊晨宇程矫杨
Owner UNIV OF SCI & TECH BEIJING
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