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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 current polymer electrolytes, the present invention provides an all-solid polymer electrolyte and a preparation method thereof

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

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preparation example Construction

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

[0049] Step S01. Dissolving at least one of aromatic diols and aromatic diamines, aromatic diacid chlorides, and polyethylene glycol in an anhydrous organic solvent, adding an acid-binding agent to it, and heating under an inert atmosphere to cause polymerization Reaction to obtain a polymer; step S02. dissolving the polymer obtained in step S01 in an organic solvent, and adding lithium salt 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 dehydrated, such as adding a desiccant to the inorganic solvent, such as adding calcium chloride or molecular sieves, to absorb the inorganic solvent. moisture, and then mix the raw materials.

[0052] Preferably, the anhyd...

Embodiment 1

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

[0071] The preparation method of the all-solid polymer electrolyte comprises 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°C for 6h under nitrogen protection;

[0073] (2) the mixed solution that reaction finishes in the step (1) is cooled to room temperature, and filter treatment to filter out triethylamine hydrochloride, add 500mL ethanol and make product precipitation, decompression suction filtration, after ethanol washing product 3 times, in 60 Vacuum drying at ℃ for 24 hours to obtain a wholly aromatic polyester / PEG multi-block polymer. The molecular structure of the obtained multi-block polymer was characterized by infrared testing, specifical...

Embodiment 2

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

[0077] The preparation method of the all-solid polymer electrolyte comprises 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 anhydrous tetrahydrofuran, add 0.04mol triethylamine (Et 3 N or TEA or NEt 3 ), reacted at 60°C for 6h under nitrogen protection;

[0079](2) Cool the reaction mixed solution in step (1) to room temperature, filter off triethylamine hydrochloride, add 500mL of ethanol to precipitate the product, filter under reduced pressure, wash the product with ethanol for 3 times and vacuum at 60°C Dry for 24h to obtain a fully aromatic polyester / PEG multi-block polymer, and use infrared testing to characterize the molecular structure of the multi-block polymer obtained, specifically as figure 1 Shown; Simultaneously carry out its NMR charac...

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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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