Novel solid-state electrolyte membrane material capable of being used as lithium ion battery as well as preparation method and application thereof

A solid-state electrolyte membrane and lithium-ion battery technology, applied in the field of polymer materials, can solve the problems of high battery polarization, reduced capacity and battery life, etc., and achieve the effects of good mechanical strength, improved migration number, and high electrochemical stability.

Active Publication Date: 2015-03-25
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, lower Li-ion migration numbers lead to higher battery polarization, reducing capacity and battery life

Method used

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  • Novel solid-state electrolyte membrane material capable of being used as lithium ion battery as well as preparation method and application thereof
  • Novel solid-state electrolyte membrane material capable of being used as lithium ion battery as well as preparation method and application thereof
  • Novel solid-state electrolyte membrane material capable of being used as lithium ion battery as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1: In an inert atmosphere, the fluorine-containing monomer ClSO 2 CF 2 CF 2 OCF 2 CF 2 SO 2 NH 2 (8g, 20mmol) was dissolved in acetonitrile (100mL), to this solution was added Cs 2 CO 3 (26g, 80mmol), polyethylene oxide monomethyl ether (M n =400, 8g, 20mmol) system was heated to 40°C and stirred for 4d, the reaction solution was filtered, and the filtrate was concentrated to obtain block copolymer PFSICs-b-PEO (18g) in the form of cesium salt.

[0037] Step 2: Dissolve the block copolymer PFSICs-b-PEO (18 g) obtained in step 1 in the form of cesium salt in acetonitrile (16 mL), and dissolve LiBF 4 (1.9g, 20mmol) was dissolved in acetonitrile (2mL), added dropwise to the acetonitrile solution containing the polymer, placed at 0°C and stirred for 24h, filtered to obtain the block copolymer PFSILi-b-PEO in the form of lithium salt, Its molecular structural formula is shown in formula (III).

[0038]

Embodiment 2

[0040] Step 1: In an inert atmosphere, the fluorine-containing monomer ClSO 2 CF 2 CF 2 OCF 2 CF 2 SO 2 NH 2 (4g, 10mmol) was dissolved in acetonitrile (80mL), and CsF (15g, 100mmol) and polyethylene oxide (M n =10000, 10g, 1mmol), the system was heated to 60°C and stirred for 10d, after which the reaction liquid was filtered, and the filtrate was concentrated to obtain block copolymer PFSICs-b-PEO (15g) in the form of cesium salt.

[0041] Step 2: Dissolve the block copolymer PFSICs-b-PEO (15 g) obtained in step 1 in the form of cesium salt in dichloromethane (140 mL), and dissolve LiClO 4 (1.05g, 10mmol) was dissolved in dichloromethane (10mL), added dropwise to the dichloromethane solution containing the polymer, stirred at 20°C for 1h, and filtered to obtain the block copolymer PFSILi- b-PEO, its molecular structure is shown in formula (IV).

[0042]

Embodiment 3

[0044] Step 1: In an inert atmosphere, the fluorine-containing monomer ClSO 2 CF 2 CF 2 OCF 2 CF 2 SO 2 NH 2 (8g, 20mmol)﹑polyethylene oxide (M n =200, 4g, 20mmol) and KF (2.3g, 40mmol) were dissolved in acetonitrile (40mL), the solution was heated to 60°C and stirred for 10d, the reaction solution was filtered, and the filtrate was concentrated to obtain a block copolymer in the form of potassium salt PFSIK-b-PEO-b-PFSIK (10g).

[0045] Step 2: Dissolve the block copolymer PFSIK-b-PEO (10 g) obtained in step 1 in the form of potassium salt in chloroform (8 mL), and dissolve LiNO 3 (1.4g, 20mmol) was dissolved in chloroform (2mL), added dropwise to the chloroform solution containing the polymer, stirred at 50°C for 20h, and filtered to obtain the block copolymer PFSILi-b-PEO- b-PFSILi, its molecular structure formula is shown in formula (V).

[0046]

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Abstract

The invention discloses a novel solid-state electrolyte membrane material capable of being used as a lithium ion battery as well as a preparation method and application thereof. The material is a segmented copolymer containing a polyfluorosulfimide based lithium salt and a polyethylene oxide structure and the molecular structure is shown in the formula (I). The method comprises the following steps: mixing a fluorine-containing monomer and polyethylene oxide and dissolving into dry acetonitrile; adding an acid-binding agent and reacting at 0-100 DEG C for 1-10 days to obtain a polymer in a form of metal ion salt; dissolving the polymer in the metal ion salt form into an organic solvent; and adding LizX to carry out a lithium ion exchange reaction to obtain a polymer in a lithium salt form. The material can be used as a battery solid electrolyte material to be applied to preparation of the lithium ion battery. The material is used as solid electrolyte and has a better application prospect in terms of inhibiting the growth of lithium dendrites in the lithium ion battery, improving the transference number of lithium ions and ensuring high conductivity at room temperature and stable battery circulation.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a block copolymer containing polyfluorosulfonimide-based lithium and polyethylene oxide structure and its preparation method and application. The resin can be used as a solid electrolyte diaphragm material For power lithium-ion batteries. Background technique [0002] Lithium-ion batteries have high specific capacity and specific energy, and have become the power source of electric vehicles or hybrid electric vehicles. Due to the high activity of lithium metal, larger lithium dendrites will form in a short time on the surface of lithium electrodes when used in conjunction with commonly used liquid electrolytes. Li dendrite formation not only reduces the battery capacity but also causes internal short circuits, leading to serious safety concerns. Solid-state electrolytes (SPE), consisting of a polymer matrix and small-molecule lithium salts, possess mechani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0025Y02E60/10
Inventor 薛立新温乐乐聂锋杜冰陆地
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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