A kind of 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: 2020-12-29
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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  • A kind of flexible solid-state lithium ion conductor applied to battery and preparation method thereof
  • A kind of flexible solid-state lithium ion conductor applied to battery and preparation method thereof
  • A kind of flexible solid-state lithium ion conductor applied to battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The polymer adopts monooxalate borate-grafted polyvinyl formal, and the structural formula is as follows, wherein the lower x:y=4. 0.4305 g of the above polymer was weighed and dissolved in 2.583 g of dimethyl sulfoxide, and fully stirred to dissolve it completely.

[0026]

[0027] (2) Continue to add 0.031g of boron-containing organic lithium salt LiODFB (relative molecular mass 144), corresponding to the general structure R1 The molar ratio of the (1,3-dioxane) to the lithium ion of the organic lithium salt LiODFB is 15:1 to form a solution.

[0028] (3) The solution was then heated to 70°C and stirred for 24h to obtain a slurry, which was then uniformly coated on a glass plate and vacuum-dried at 50°C for 24h to obtain a flexible solid-state lithium ion conductor.

[0029] The microscopic morphology of the flexible solid-state lithium ion conductor obtained in Example 1 is as follows: figure 1 As shown in the figure, it can be seen that the lithium ion condu...

Embodiment 2

[0037] (1) The polymer adopts lithium benzenesulfonate grafted polyvinylidene fluoride, and the structural formula is as follows, wherein x: y= 1.2:1. Dissolve 0.7231 g of the above polymer in 3.32 g of acetonitrile, stir well to dissolve it completely.

[0038]

[0039] (2) Continue to add 0.054g organic lithium salt LiBETI with sulfonimide group (relative molecular mass 387), corresponding to the general structure R 1 the (-ch 2 -CF 2 -) with a molar ratio of 50:1 to the organic lithium salt LiBETI lithium ions to form a solution.

[0040] (3) Then the solution was heated to 40°C and stirred for 30h to obtain a slurry. Finally, the slurry was vacuum-dried at 60 °C for 36 h to obtain a flexible solid-state lithium ion conductor.

[0041] The AC impedance test results of the flexible solid-state lithium ion conductor obtained in Example 2 are as follows: image 3 As shown, at room temperature of 25 °C, the room temperature conductivity of this lithium ion conductor is ...

Embodiment 3

[0048] (1) The polymer adopts perfluoroalkyl carboxyl lithium grafted polyethylene carbonate, and the structural formula is shown below, wherein x:y=2.4:1. 0.6471 g of the above polymer was weighed and dissolved in 2.983 g of tetrahydrofuran, and fully stirred to dissolve it completely.

[0049]

[0050] (2) Continue to add 0.151g of organic lithium salt ddCTP-Li containing phosphoric acid groups 3 (relative molecular mass 469), corresponding to general structure R 1 The (-O-CO-O-CH 2 -) with the organolithium salt ddCTP-Li 3 The molar ratio of lithium ions is 10:1 to form a solution.

[0051] (3) Then the solution was heated to 120 °C and stirred for 2 h to obtain a slurry, which was then uniformly coated on a glass plate, and finally vacuum-dried at 60 °C for 36 h to obtain a flexible solid-state lithium ion conductor.

[0052] The solid lithium ion conductor obtained in Example 3 has good flexibility; the tensile strength-strain curve is as follows: Figure 7 As sho...

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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, and particularly relates 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 material that can conduct lithium ions and insulate electronically. It is an important medium for lithium ion conduction in lithium ion batteries, metal lithium 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 liquid, which can take advantage of the fast lithium ion migration rate and high conductivity (≥10% in the liquid system). -3 S / cm), and liquid lithium ion conductors have mobility and can infiltrate porous electrodes to build continuous channels for lithium ion conduction in batteries, so liquid lithium i...

Claims

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Application Information

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Patent Type & Authority Patents(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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