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Preparation method of single-ion gel electrolyte capable of blocking polysulfide ion shuttle effect

A technology of gel electrolyte and shuttle effect, which is applied in the field of lithium-ion batteries, can solve the problems of weakened battery cycle life, loss of active materials, and ineffective barrier, etc., to achieve suppression of shuttle effect, increase liquid absorption rate, high capacity and cycle The effect of longevity

Active Publication Date: 2016-05-11
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When it is used as a lithium-sulfur battery separator, it cannot effectively prevent polysulfide ions from passing through the separator and reacting with lithium metal in the negative electrode, resulting in the loss of active materials and the weakening of battery cycle life.

Method used

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  • Preparation method of single-ion gel electrolyte capable of blocking polysulfide ion shuttle effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) SPEEK preparation

[0034] Take 5g of PEEK resin (Imperial Chemical Industries Group, UK), and quickly mix with concentrated H at room temperature 2 SO 4 phase mix, Ag 2 SO 4 Add H in advance 2 SO4 , the sulfonation process was completed within 15 minutes. The reaction product was diluted, dialyzed, concentrated by ultrafiltration, and then freeze-dried and stored to obtain SPEEK.

[0035] (2) Preparation of SPEEK-Li solution

[0036] Take 9g of N-methylpyrrolidone (NMP), add 0.9g of SPEEK resin, stir and dissolve at 130°C, disperse with ultrasonic vibration (ultrasonic frequency 40kHz) for 30 minutes, then add 5g of LiOH, stir for 2h, and filter to obtain the filtrate SPEEK-Li.

[0037] (3) SPEEK-Li / Li 2 S 6 Preparation of mixed solution

[0038] In an argon-protected glove box, add 0.0233g lithium sulfide and 0.0777g elemental sulfur to the SPEEK-Li solution, stir at 60°C for 6h to form SPEEK-Li and Li 2 S 6 mixed solution.

[0039] (4) SPEEK-Li / Li 2 ...

Embodiment 2

[0044] (1) SPEEK preparation

[0045] Take 5g of PEEK resin (Imperial Chemical Industries Group, UK), and quickly mix with concentrated H at room temperature 2 SO 4 phase mix, Ag 2 SO 4 Add H in advance 2 SO 4 , the sulfonation process was completed within 15 minutes. The reaction product was diluted, dialyzed, concentrated by ultrafiltration, and then freeze-dried and stored to obtain SPEEK.

[0046] (2) Preparation of SPEEK-Li solution

[0047] Take 9g of N-methylpyrrolidone (NMP), add 0.9g of SPEEK resin, stir and dissolve at 130°C, disperse with ultrasonic vibration (ultrasonic frequency 40kHz) for 30 minutes, then add 5g of LiNO3, stir for 2h, and filter to obtain the filtrate SPEEK-Li.

[0048] (3) SPEEK-Li / Li 2 S 6 Preparation of mixed solution

[0049] In an argon-protected glove box, add 0.0233g lithium sulfide and 0.0777g elemental sulfur to the SPEEK-Li solution, stir at 60°C for 6h to form SPEEK-Li and Li 2 S 6 mixed solution.

[0050] (4) SPEEK-Li / Li ...

Embodiment 3

[0055] (1) At room temperature, the sulfonated catalyst Ag 2 SO 4 Add concentrated sulfuric acid to disperse and mix to form a mixed solution, then quickly add polyether ether ketone to the mixed solution for sulfonation reaction for 5 minutes, the reaction product is diluted, dialyzed, concentrated by ultrafiltration, and then freeze-dried and stored to obtain sulfonated polyether ether ketone (SPEEK);

[0056] (2) Add sulfonated polyether ether ketone (SPEEK) into N-methylpyrrolidone (NMP) and heat to 100°C, and disperse by ultrasonic for 50 minutes to form a sulfonated polyether ether ketone solution; add lithium chloride and stir Until the lithium salt is precipitated, the precipitated lithium salt is filtered and removed to obtain a lithiated sulfonated polyether ether ketone solution (SPEEK-Li);

[0057] (3) Transfer the lithiated sulfonated polyether ether ketone solution into an argon-protected glove box, add lithium sulfide and elemental sulfur at a molar ratio of 1...

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Abstract

The invention provides a preparation method of a single-ion gel electrolyte capable of blocking a polysulfide ion shuttle effect. The method comprises the following steps: firstly adding sulfonated polyether ether ketone into N-methyl pyrrolidone, heating and dispersing to form a sulfonated polyether ether ketone solution; then adding a lithium source, stirring till lithium salt is separated out, filtering the lithiated and sulfonated polyether ether ketone solution; adding lithium sulfide and elemental sulfur into an argon-protected glove box, stirring, then pouring the solution into a polytetrafluoroethylene culture dish, and evaporating the solution to obtain a lithium ion exchange membrane; soaking the lithium ion exchange membrane in a mixed solution prepared from dioxolame and glycol dimethyl ether according to a volume ratio of 1 to 1 till no lithium polysulfide is dissolved out; then dipping the lithium ion exchange membrane into a lithium-sulfur battery electrolyte for 2-5 hours to obtain the gel electrolyte. Through the single-ion gel electrolyte capable of blocking the polysulfide ion shuttle effect, the shuttle and migration of polysulfide ions in the charging and discharging processes can be avoided; the single-ion gel electrolyte has high capacity and cycle life and also has excellent chemical stability and thermal stability.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing a single-ion gel electrolyte that blocks the shuttle effect of polysulfide ions. Background technique [0002] Lithium-sulfur battery is a kind of lithium-ion battery, which uses metal lithium as negative electrode material, sulfur element as positive electrode material, and liquid electrolyte. Lithium-sulfur batteries have the advantages of light weight, large capacity, and no memory effect, and elemental sulfur has the advantages of abundant reserves, environmental friendliness, and low price. In addition, the theoretical specific capacity of the lithium-sulfur battery is as high as 1675mAhg -1 , energy density up to 2600Whkg -1 , much higher than the current commercial lithium-ion battery system. Therefore, lithium-sulfur battery is a very promising lithium-ion battery. [0003] However, the sulfur cathode is reduced to long-chain pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565
CPCH01M10/0565H01M2300/0025H01M2300/0085Y02E60/10
Inventor 曹勇蔡文龙
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY