Lithium-sulfur battery modified diaphragm as well as preparation method and application thereof

A lithium-sulfur battery and modification technology, which is applied in the field of nanomaterials and electrochemistry, can solve the problems of fast capacity decay and poor cycle performance, and achieve the effect of simple process, low energy consumption, and promotion of lithium ion transmission

Pending Publication Date: 2022-08-05
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a modified separator for lithium-sulfur batteries and its preparation method and application to solve the problems of fast capacity decay and poor cycle performance in existing lithium-sulfur batteries

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  • Lithium-sulfur battery modified diaphragm as well as preparation method and application thereof
  • Lithium-sulfur battery modified diaphragm as well as preparation method and application thereof
  • Lithium-sulfur battery modified diaphragm as well as preparation method and application thereof

Examples

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preparation example Construction

[0033] A preparation method of a lithium-sulfur battery modified diaphragm, comprising the following steps:

[0034] S1. Mix the initiator and the cross-linking polymer to form a mixed solution A, place the polymer film in the mixed solution A, stand to react, and obtain the polymer film modified by the precursor polymer after drying;

[0035] S2. Dissolving the metal salt and the organic ligand in a solvent to prepare a mixed solution B, placing the polymer membrane modified by the precursor polymer in the mixed solution B, standing to react, and drying to obtain a modified separator for a lithium-sulfur battery.

[0036] Specifically, in step S1, the initiator includes one of a hydrochloric acid buffer, a biarylphosphine sulfonate palladium catalyst, sodium hydroxide and an azo compound, preferably a hydrochloric acid buffer. The cross-linked polymer is a polymer containing a catechol group structure, preferably dopamine. The polymer film includes one of polypropylene film,...

Embodiment 1

[0055] The present embodiment provides a method for preparing a modified diaphragm of a lithium-sulfur battery and a lithium-sulfur battery assembled therewith, including the following steps:

[0056] 1) Dissolve 200 mg of dopamine in 100 ml of hydrochloric acid buffer with a pH value of 8.5, fully soak the polypropylene in the mixed solution, let it stand for 24 hours, wash and dry to obtain the precursor polydopamine-modified polypropylene membrane (PDA@ PP);

[0057] 2) 1.190g of zinc nitrate and 1.312g of dimethylimidazole were respectively dissolved in 20mL of methanol and mixed to obtain a ZIF-8 mother liquor. During the mixing process, the precursor was placed in the mixed solution, and at 25°C, let stand The reaction was carried out for 24 h, washed and dried to obtain a ZIF-8 nanofilm-modified polypropylene lithium-sulfur battery modified separator (ZIF-8 / PDA@PP) based on polydopamine;

[0058] 3) The ZIF-8 / PDA@PP separator was used as the battery separator, the lith...

Embodiment 2

[0067] The present embodiment provides a preparation method of a modified separator for a lithium-sulfur battery and a lithium-sulfur battery assembled therewith, the difference from the embodiment 1 is:

[0068] 1) dissolve 300mg of dopamine in 100ml of hydrochloric acid buffer with a pH value of 8.5, fully soak the polyethylene film in the mixed solution;

[0069] 2) 2.244g of zinc nitrate and 2.624g of dimethylimidazole were respectively dissolved in 40ml of methanol and mixed to obtain a ZIF-8 mother liquor. During the mixing process, the precursor was placed in the mixed solution, and at 25° C. Reaction 12h;

[0070] The remaining steps and parameters are the same as in Example 1.

[0071] The modified separator of polyethylene lithium-sulfur battery and the assembled lithium-sulfur battery prepared based on the polydopamine-based ZIF-8 nanofilm prepared in Example 2 were tested. It was found that ZIF-8 formed a dense modified layer on the surface of the separator with ...

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Abstract

The invention discloses a lithium-sulfur battery modified diaphragm as well as a preparation method and application thereof, the preparation method comprises the following steps: mixing an initiator and a cross-linked polymer to prepare a mixed solution A, placing a polymer film in the mixed solution A, standing for reaction, and drying to obtain a precursor polymer modified polymer film; dissolving a metal salt and an organic ligand in a solvent to prepare a mixed solution B, placing the precursor polymer modified polymer film in the mixed solution B, standing for reaction, and drying to obtain the lithium-sulfur battery modified diaphragm. According to the in-situ growth method of the metal organic framework nano-film, the metal organic framework nano-film can grow on various substrates, has good stability and can be used for battery diaphragm modification; the prepared lithium-sulfur battery modified diaphragm is assembled into a total battery, so that lithium ion transmission can be promoted, and the cycling stability can be improved; the preparation method is simple and convenient in process and relatively low in energy consumption, and the product is beneficial to market popularization.

Description

technical field [0001] The invention relates to the technical field of nanomaterials and electrochemistry, in particular, to a modified diaphragm of a lithium-sulfur battery and a preparation method and application thereof. Background technique [0002] With its high theoretical capacity (1675mAh g -1 ) and energy density (2600Wh kg -1 ) is considered to be the most potential energy storage system in the future. However, the shuttle effect of soluble polysulfides, sulfur and Li 2 The rapid battery capacity decay caused by key factors such as the insulating properties of S and volume expansion during cycling hinders the practical application of Li-S batteries. To address the problem of capacity fading, the researchers focused on suppressing the shuttle effect of polysulfides. To achieve this goal, a large number of modification strategies have been developed around the separator based on the chemisorption and physical adsorption of polysulfides. [0003] In the existing ...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/411H01M50/417H01M50/449H01M50/489H01M50/491H01M50/497H01M10/052H01M10/42
CPCH01M50/403H01M50/417H01M50/411H01M50/449H01M50/489H01M50/491H01M50/497H01M10/052H01M10/4235Y02E60/10
Inventor 许絮周铖吴秀秀麦立强
Owner WUHAN UNIV OF TECH
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