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Unsaturated sulfur-containing composite electrolyte as well as preparation method and application thereof

A composite electrolyte and sulfide electrolyte technology, applied in the field of unsaturated sulfur-containing composite electrolyte, can solve the problem of low conductivity of all solid polymer electrolytes

Active Publication Date: 2019-11-05
SAIC MOTOR +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the ion conduction of the polymer solid electrolyte is mainly carried out in the non-crystalline region of the polymer matrix, the conductivity of the all-solid polymer electrolyte is very low, and the conductivity of the PEO-based polymer electrolyte at room temperature is only 10. -6 ~10 -7 S / cm

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  • Unsaturated sulfur-containing composite electrolyte as well as preparation method and application thereof

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preparation example Construction

[0036] The present invention provides a method for preparing the unsaturated sulfur-containing composite electrolyte described in the above technical solution, comprising the following steps:

[0037] Mix the polymer matrix, lithium salt and organic solvent to obtain a polymer solution; the polymer matrix is ​​selected from one of polyethylene oxide, polyether, polyvinylidene fluoride, polymethyl methacrylate and polyacrylonitrile or more;

[0038]mixing the polymer solution and the unsaturated soluble sulfide electrolyte solution of the general formula shown in formula I, casting to form a film, and drying to obtain an unsaturated sulfur-containing composite electrolyte;

[0039] Or mix the polymer matrix, lithium salt and organic solvent, cast into a film, and dry to obtain a polymer electrolyte membrane; the polymer matrix is ​​selected from polyethylene oxide, polyether, polyvinylidene fluoride, polymethyl methacrylate and one or more of polyacrylonitrile;

[0040] The p...

Embodiment 1

[0066] 0.06414g of sulfur, 0.04595g of lithium sulfide and 0.22227g of phosphorus pentasulfide were stirred in an acetonitrile solution to obtain LiPS 4 solution;

[0067] Under the protection of argon atmosphere, weigh polyethylene oxide PEO and LiTFSI according to the EO / Li molar ratio of 20:1, stir in acetonitrile, and add LiPS with a mass ratio of 0.2% after stirring 4 , continue to stir to obtain a casting solution; cast the casting solution in a polytetrafluoroethylene mold, place it at room temperature for 24 hours, volatilize the solvent acetonitrile, and then dry it in a 50°C oven for 48 hours to completely volatilize the solvent to obtain an unsaturated sulfur-containing Composite electrolyte membrane.

[0068] Using stainless steel as the blocking electrode, the electrochemical impedance spectroscopy (EIS) test was carried out at 25°C to calculate its conductivity. The results of the ion conductivity are shown in Table 1:

[0069] Table 1 Isolation of the unsatura...

Embodiment 2

[0089] 0.06414g of sulfur, 0.02398g of lithium sulfide and 0.22227g of phosphorus pentasulfide were stirred in an acetonitrile solution to obtain Li 0.5 P.S. 4 solution;

[0090] Under the protection of an argon atmosphere, weigh polyethylene oxide PEO and LiTFSI according to the EO / Li molar ratio of 20:1, stir in acetonitrile, and add Li with a mass ratio of 0.45% after the stirring is uniform. 0.5 P.S. 4, continue to stir to obtain a casting solution; cast the casting solution in a polytetrafluoroethylene mold, place it at room temperature for 24 hours to evaporate the solvent, and then dry it in an oven at 50°C for 48 hours to completely evaporate the solvent acetonitrile to obtain an unsaturated sulfur-containing Composite electrolyte membrane.

[0091] The present invention tests the ion conductivity, electrochemical window, 15-day resistance and discharge capacity of the unsaturated sulfur-containing composite electrolyte membrane prepared in Example 2, and the result...

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Abstract

The invention provides an unsaturated sulfur-containing composite electrolyte and a preparation method thereof; the unsaturated sulfur-containing composite electrolyte comprises an unsaturated solublesulfide electrolyte as the general formula I, a polymer matrix and a lithium salt; in Li3-xPS4 in formula I, x is greater than 0 and less than 3; the polymer electrolyte comprises a polymer matrix and a lithium salt, wherein the polymer matrix is one or more of polyoxyethylene, polyether, polyvinylidene fluoride, polymethyl methacrylate and polyacrylonitrile. In the composite electrolyte, the unsaturated soluble sulfide electrolyte with the general formula I and the polymer matrix can be mixed uniformly in the level of atoms / molecules, so that the contact area is large, the crystallinity of the polymer matrix is inhibited, the chain segment movement capability of the polymer matrix is improved, and the carrier concentration is increased; and the electrical conductivity of the unsaturatedsoluble sulfide electrolyte is increased, so that the composite electrolyte has relatively high electrical conductivity, relatively high electrochemical stability and a potential window.

Description

technical field [0001] The invention relates to the field of new energy technology, in particular to an unsaturated sulfur-containing composite electrolyte, a preparation method and application thereof. Background technique [0002] Compared with other secondary batteries, lithium-ion batteries have the advantages of high voltage, high energy density, long cycle life and good safety performance, and become the most widely used rechargeable batteries, such as portable electronic products, electric vehicles and other large mobile devices. Power Battery. At present, relatively mature liquid batteries often cause safety hazards due to leakage and volatilization of liquid electrolytes, resulting in combustion and explosion. Compared with traditional liquid batteries, the solid electrolyte used in solid-state batteries is non-volatile and non-flammable, and can effectively prevent short-circuit problems caused by lithium metal dendrites; at the same time, it can also adopt a stac...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/058
CPCH01M10/0566H01M10/058Y02E60/10Y02P70/50
Inventor 朱冠楠黄杰李久铭孙亮任超时冯奇李泓俞会根
Owner SAIC MOTOR
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