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Polyimide-type single-ion-conducting polymers grafted with bis-sulfonimides at side chains and their applications

A bissulfonimide and polyimide type technology is applied in the field of polyimide type single ion conducting polymers to achieve the effects of excellent electrochemical stability, good cycle performance and excellent chemical stability

Active Publication Date: 2020-04-14
萨尔法(武汉)新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some literatures have reported gel single-ion conduction metal lithium polymer secondary batteries, the given cycle times are all lower than 200 cycles

Method used

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  • Polyimide-type single-ion-conducting polymers grafted with bis-sulfonimides at side chains and their applications
  • Polyimide-type single-ion-conducting polymers grafted with bis-sulfonimides at side chains and their applications
  • Polyimide-type single-ion-conducting polymers grafted with bis-sulfonimides at side chains and their applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1, this example synthesizes polyethylene maleic anhydride side chain grafted bis-sulfonimide polymer, the steps are as follows:

[0032] (1) Synthesizing bis-sulfonimides substituted with one-sided para-amino groups according to the prior art, the synthetic route is as follows:

[0033]

[0034] Specifically include the following steps:

[0035] (1.1) Preparation of 4-nitro 4'-trifluoromethyl bisbenzenesulfonimide

[0036] p-Nitrobenzenesulfonamide and p-trifluoromethylbenzenesulfonyl chloride were stirred in alkaline solution at 90°C for 12h at a feed ratio of 2:1. Stirring was stopped, filtered and the filtrate collected. HCl was added to the filtrate to obtain a white precipitate, which was filtered, and the product was recrystallized and dried for later use. The yield was 40%.

[0037] (1.2) Preparation of 4-amino 4'-trifluoromethyl bisbenzenesulfonimide

[0038] The product of step 1.1 was dissolved in 80 mL of dichloromethane solution, poured into t...

Embodiment 2

[0058] Example 2: In this example, the poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) is mixed with polyethylene maleic anhydride side chain grafted bis-sulfonimide polymer lithium salt prepared in Example 1 The composite film is obtained as the separator of the battery and also as the electrolyte, and the polymer lithium salt, LiFePO 4 Mix it with conductive carbon powder as the positive electrode material of the battery, and use metal lithium as the negative electrode material to obtain a gel-type single-ion conductive metal lithium polymer secondary battery. The steps are as follows:

[0059] Preparation of positive electrode: Active material, activated carbon and polymer lithium salt are weighed according to the mass ratio of 6:2:2, mixed evenly after adding N-methylpyrrolidone, coated on metal aluminum foil with a scraper, dried, cut into pieces, vacuum dry.

[0060] Battery assembly: Place the positive electrode sheet, PP film and metal lithium sheet in a 2...

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Abstract

The invention discloses a polyimide-type single-ion-conducting polymer grafted with bis-sulfonimide side chains and its synthesis method and application. The room-temperature ionic conductivity of the polymer electrolyte membrane formed by blending the polymer with PVDF-HFP 0.10mS·cm ‑1 , the maximum tensile strength in the dry state is 15.5MPa, as the electrolyte and separator of the gel-type metal lithium polymer secondary battery, it shows excellent electrochemical stability.

Description

technical field [0001] The present invention relates to side chain grafted polyimide type single ion conducting polymer and application thereof, described a kind of polyethylene maleic anhydride side chain grafted bissulfonimide polymer electrolyte in metal lithium polymer secondary battery exhibited excellent electrochemical stability. Background technique [0002] The relative atomic mass of metal lithium is 6.94, the standard electrode potential is -3.045V (vs. NHE), and the theoretical specific capacity as the negative electrode of the battery is as high as 3860mAh / g. Lithium metal can constitute a secondary battery with high energy density and power density when matched with a suitable cathode. Research on lithium secondary batteries began in the 1970s, but due to the high activity of metallic lithium and the formation of dendrites during charging and discharging, internal short circuits resulted in safety accidents. Subsequently, graphite anodes replaced metal lithiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10H01M2/16H01M10/0565H01M50/411
CPCH01M10/0565C08G73/10H01M50/411Y02E60/10
Inventor 程寒松孙玉宝潘其云
Owner 萨尔法(武汉)新能源科技有限公司
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