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Preparation method of an eight-arm liquid crystal block copolymer composite electrolyte

A block copolymer and composite technology, which is applied in the field of electrolyte materials for lithium-ion batteries, can solve the problems of reduced ion mobility, etc., and achieve the effects of improving ion conductivity, stability, and good mechanical properties

Active Publication Date: 2019-11-19
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because its ion transport mainly occurs in the non-crystalline region, and the high crystallinity of the PEO salt electrolyte will cause a decrease in ion mobility.

Method used

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  • Preparation method of an eight-arm liquid crystal block copolymer composite electrolyte
  • Preparation method of an eight-arm liquid crystal block copolymer composite electrolyte
  • Preparation method of an eight-arm liquid crystal block copolymer composite electrolyte

Examples

Experimental program
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Embodiment 1

[0036] The invention provides a method for preparing an eight-arm liquid crystal block copolymer composite electrolyte, comprising the following steps:

[0037] (1) Preparation of 4-cyano-4'-(6-hydroxyhexyloxy)biphenyl

[0038] Put 10mmol of p-cyanobiphenol and 30mmol of potassium carbonate in 100 mL of acetone to reflux, control the temperature at 65°C, reflux for 3 hours, then add 15 mmol of 6-bromo-n-hexanol and continue to reflux for 24 hours, first use 50 mL of chloroform The product was extracted 3 times, then washed 3 times with 50 mL deionized water, dried with 1 g anhydrous magnesium sulfate, filtered and recrystallized with 90 mL methanol to prepare 4-cyano-4'- (6-hydroxyhexyloxy)biphenyl;

[0039] (2) Preparation of 6-(4-cyano-4'-diphenoxy)hexyl methacrylate

[0040] Dissolve 10mmol of 4-cyano-4'-(6-hydroxyhexyloxy)biphenyl prepared in Step 1 in 100 mL of anhydrous tetrahydrofuran, stir for 3 h, and dissolve 11 mmol of anhydrous triethyl Amine and anhydrous tetrahy...

Embodiment 7

[0052] The invention provides a preparation method of an eight-arm liquid crystal block copolymer composite electrolyte, comprising the following steps:

[0053] (1) Preparation of 4-cyano-4'-(6-hydroxyhexyloxy)biphenyl

[0054] Put 8mmol of p-cyanobiphenol and 25mmol of potassium carbonate in 100 mL of acetone to reflux, control the temperature at 60°C, reflux for 4 hours, then add 12 mmol of 6-bromo-n-hexanol and continue to reflux for 22 hours, first use 50 mL of chloroform to The product was extracted 3 times, then washed 3 times with 50 mL of deionized water, dried with 1 g of anhydrous magnesium sulfate, filtered and recrystallized with 90 mL of methanol to prepare 4-cyano-4'-( 6-hydroxyhexyloxy) biphenyl;

[0055] (2) Preparation of 6-(4-cyano-4'-diphenoxy)hexyl methacrylate

[0056] Dissolve 10mmol of 4-cyano-4'-(6-hydroxyhexyloxy)biphenyl prepared in step 1 in 100 mL of anhydrous tetrahydrofuran, stir for 3 h, and dissolve 15 mmol of anhydrous triethyl Amine and an...

Embodiment 8

[0064] The invention provides a preparation method of an eight-arm liquid crystal block copolymer composite electrolyte, comprising the following steps:

[0065] (1) Preparation of 4-cyano-4'-(6-hydroxyhexyloxy)biphenyl

[0066] Put 15mmol of p-cyanobiphenol and 35mmol of potassium carbonate in 150 mL of acetone to reflux, control the temperature at 70°C, after reflux for 2 hours, then add 18 mmol of 6-bromo-n-hexanol and continue to reflux for 26 hours, first use 50 mL of chloroform The product was extracted 3 times, then washed 3 times with 50 mL deionized water, dried with 1 g anhydrous magnesium sulfate, filtered and recrystallized with 90 mL methanol to prepare 4-cyano-4'- (6-hydroxyhexyloxy)biphenyl;

[0067] (2) Preparation of 6-(4-cyano-4'-diphenoxy)hexyl methacrylate

[0068] Dissolve 12mmol of 4-cyano-4'-(6-hydroxyhexyloxy)diphenyl prepared in Step 1 in 120 mL of anhydrous tetrahydrofuran, stir for 3 h, and dissolve 15 mmol of anhydrous triethyl Amine and anhydrou...

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Abstract

The invention provides a method for preparing an eight-arm liquid crystal block copolymer composite electrolyte, comprising the following steps: (1) preparation of 4-cyano-4'-(6-hydroxyhexyloxy)biphenyl; ( 2) Preparation of 6-(4-cyano-4'-diphenoxy)hexyl methacrylate; (3) Preparation of eight-armed polyethylene glycol-bromine; (4) Block copolymerization of eight-armed liquid crystals (5) Preparation of eight-arm liquid crystal block copolymer composite electrolyte. In the present invention, by adding eight-arm liquid crystal block copolymers to microscopically control the composite film, a composite all-solid polymer electrolyte with good mechanical properties and stable electrochemical properties is obtained, and the conductivity values ​​at room temperature and 95°C after annealing are respectively Up to 6.20×10 ‑5 S cm ‑1 and 5.65×10 ‑4 S cm ‑1 . Assembled into LiFePO 4 / 8‑PEG‑MALC‑30 / Li button battery has a discharge specific capacity of 127mAh g at 95°C and 1C ‑1 . The lithium secondary battery assembled by using the eight-arm liquid crystal block copolymer composite electrolyte provided by the invention has a certain application prospect in energy storage batteries.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery electrolyte materials, in particular to a preparation method of an eight-arm liquid crystal block copolymer composite electrolyte. Background technique [0002] Although my country is a big country in battery production, it is not a strong country in battery research and development. Chemical power sources are facing great development opportunities and severe challenges, so taking the road of innovation is the only choice. Lithium-ion battery is a green high-energy battery that appeared in the 1990s, and has attracted much attention in the fields of energy chemistry and material chemistry. The electrolyte is an important part of the lithium-ion battery and determines the working mechanism of the battery to a large extent, that is, transmitting current at the positive and negative electrodes, affecting the specific energy of the battery, safety performance, rate charge and discharge pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525C08F293/00
CPCC08F293/00H01M10/0525H01M10/0565H01M2300/0082H01M2300/0091Y02E60/10
Inventor 童永芬许裕忠陈玺茜许秋华
Owner NANCHANG HANGKONG UNIVERSITY
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