All-solid-state polymer electrolyte, preparation method thereof, and all-solid-state lithium ion battery

An all-solid polymer and electrolyte technology, used in secondary batteries, circuits, electrical components, etc., can solve the problems of poor high voltage stability, low electrical conductivity, poor mechanical properties, etc., to prevent lithium metal powder and high electrical conductivity. , good compatibility

Active Publication Date: 2019-05-17
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of poor mechanical properties, low electrical conductivity, and poor high-voltage stability in

Method used

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  • All-solid-state polymer electrolyte, preparation method thereof, and all-solid-state lithium ion battery
  • All-solid-state polymer electrolyte, preparation method thereof, and all-solid-state lithium ion battery
  • All-solid-state polymer electrolyte, preparation method thereof, and all-solid-state lithium ion battery

Examples

Experimental program
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Effect test

Example Embodiment

[0048] Specifically, the preparation method includes the following steps:

[0049] Step S01. Dissolve at least one of aromatic diol and aromatic diamine, aromatic diacid chloride and polyethylene glycol in anhydrous organic solvent, add acid binding agent to it, and heat under inert atmosphere to polymerize Reaction to obtain a polymer; step S02. The polymer obtained in step S01 is dissolved in an organic solvent, and lithium salt is added thereto to obtain a mixed solution;

[0050] Step S03. Casting the mixed solution to form a membrane to obtain an all-solid polymer electrolyte.

[0051] Specifically, in the above step S01, the polymerization reaction needs to occur under anhydrous conditions, so the inorganic solvent can be subjected to water removal treatment, such as adding a desiccant to the inorganic solvent, such as adding calcium chloride or molecular sieve, to absorb the inorganic solvent Moisture, and then mix the raw materials.

[0052] Preferably, the anhydrous organic ...

Example Embodiment

[0069] Example 1

[0070] This embodiment 1 provides a method for preparing an all-solid polymer electrolyte.

[0071] The preparation method of the all-solid polymer electrolyte includes the following steps:

[0072] (1). Dissolve 0.02mol 2-phenylterephthaloyl chloride, 0.0164mol 2-phenylhydroquinone and 0.0036mol polyethylene glycol (PEG, molecular weight 2kg / mol) in 100mL anhydrous tetrahydrofuran, Add 0.04mol triethylamine (Et 3 N or TEA or NEt 3 ), react at 60℃ for 6h under nitrogen protection;

[0073] (2) The mixed solution after the reaction in step (1) was cooled to room temperature, filtered to remove triethylamine hydrochloride, 500 mL of ethanol was added to precipitate the product, filtered under reduced pressure, and the product was washed with ethanol for 3 times and then heated to 60 The fully aromatic polyester / PEG multi-block polymer was obtained by vacuum drying at ℃ for 24 hours. The molecular structure of the obtained multi-block polymer was characterized by infr...

Example Embodiment

[0075] Example 2

[0076] Embodiment 2 provides a method for preparing an all-solid polymer electrolyte.

[0077] The preparation method of the all-solid polymer electrolyte includes the following steps:

[0078] (1) Dissolve 0.02mol 2-phenylterephthaloyl chloride, 0.0187mol 2-phenylhydroquinone and 0.0013mol polyethylene glycol (PEG, molecular weight 6kg / mol) in 110mL dry tetrahydrofuran, add 0.04mol triethylamine (Et 3 N or TEA or NEt 3 ), react at 60℃ for 6h under nitrogen protection;

[0079] (2) Cool the reaction mixture solution in step (1) to room temperature, filter out the triethylamine hydrochloride, add 500 mL of ethanol to precipitate the product, filter under reduced pressure, wash the product with ethanol three times and vacuum at 60°C Dry for 24 hours to obtain a fully aromatic polyester / PEG multi-block polymer, and use infrared test to characterize the molecular structure of the obtained multi-block polymer. figure 1 As shown; at the same time it is characterized by N...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to an all-solid-state polymer electrolyte, a preparation method thereof, and an all-solid-state lithium ion battery. The all-solid-state polymer electrolyte comprises lithium salt and a polymer, wherein the polymer is provided with a structure as shown in the general formula (I). The all-solid-state polymer electrolyte provided by the invention achieves high compatibility with the lithium salt, excellent film-forming performance, a Young modulus of 3.9GPa, and a breaking strength of 140MPa, and can effectivelyinhibit the growth of cathode lithium dendrites and pulverization; the ionic conductivity at the room temperature is (0.1-3) x 10<-5>S/cm; and when the all-solid-state polymer electrolyte is used asan electrolyte for the all-solid-state lithium ion battery, the possible safety problems of a liquid-state electrolyte can be avoided, so that the safety performance of the lithium ion battery can begreatly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to an all-solid polymer electrolyte, a preparation method thereof, and an all-solid-state lithium-ion battery. Background technique [0002] Lithium-ion batteries are superior to many advantages such as no memory effect, high volume specific capacity, high working voltage, wide temperature range, low self-discharge rate, long cycle life, etc., and have been widely used in smart electronic products, electric vehicles and large Large-scale energy storage grid and other energy fields. The further development of lithium secondary batteries with higher specific energy and high safety is of great significance and value to the further development of the new energy industry. [0003] However, in recent years, lithium battery safety accidents have frequently exploded, making the safety of lithium-ion batteries a technical bottleneck restricting the widespread and i...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0565
CPCY02E60/10
Inventor 邓永红徐洪礼
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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