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Solid electrolyte and preparation method thereof, and lithium ion battery

A technology of solid electrolytes and electrolytes, applied in solid electrolytes, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of low mechanical properties, high high temperature ionic conductivity, etc., and achieve the effect of high ionic conductivity and high mechanical strength

Pending Publication Date: 2019-07-23
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problem of high temperature ionic conductivity of polymer electrolytes in the prior art but low mechanical properties, the object of the present invention is to provide a solid electrolyte and its preparation method and lithium ion battery. The solid electrolyte provided by the present invention meets the requirements of High temperature Li + High mechanical strength at the same time as the fast transmission path

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  • Solid electrolyte and preparation method thereof, and lithium ion battery

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Embodiment 1

[0067] In this embodiment, a solid electrolyte is prepared according to the following method:

[0068](1) A high-porosity film-like polyethylene substrate with an ordered pore structure was prepared by a thermally induced phase separation method, with a thickness of 5 μm and a porosity of 60%.

[0069] (2) Using ethanol as a solvent, uniformly mix the inorganic filler magnesium oxide to obtain the first mixed solution (the mass concentration of the inorganic filler is 0.2g / L), and place the porous polymer skeleton in the first mixed solution at 25°C Fully soak for 20 minutes to fill the inorganic material in the pore structure of the high-porous polyethylene skeleton to obtain the treated substrate.

[0070] (3) Using dimethylformamide as solvent, polymer electrolyte polyacrylonitrile and lithium salt LiClO 4 Mix evenly to obtain a uniform solution, which is the second mixed solution (the mass concentration of the polymer electrolyte is 0.5 g / L).

[0071] (4) pouring the sec...

Embodiment 2

[0076] In this embodiment, a solid electrolyte is prepared according to the following method:

[0077] (1) A high-porosity membrane-like polypropylene skeleton was prepared by a dry single-drawing method, with a thickness of 12 μm and a porosity of 60%.

[0078] (2) Using DMF as a solvent, uniformly mix the inorganic filler silica to obtain the first mixed solution (the mass concentration of the inorganic filler is 0.4g / L), and place the porous polymer skeleton in the first mixed solution at 15°C Fully soak for 10 minutes, so that the solid electrolyte raw material is completely filled in the pore structure of the polymer skeleton, and the treated substrate is obtained.

[0079] (3) Using acetonitrile as solvent, polymer electrolyte polyvinylidene fluoride and lithium salt LiCF 3 SO 3 Mix evenly to prepare a uniform solution, which is the second mixed solution (the mass concentration of the polymer electrolyte is 1.0 g / L).

[0080] (4) pouring the second mixed solution obta...

Embodiment 3

[0085] (1) A high-porosity film-like polypropylene / polypropylene / polypropylene substrate with an ordered pore structure was prepared by a three-layer co-extrusion method, with a thickness of 25 μm and a porosity of 50%.

[0086] (2) Using acetone as a solvent, uniformly mix the inorganic filler aluminum oxide to obtain the first mixed solution (the mass concentration of the inorganic filler is 0.5 g / L), and place the porous polymer skeleton in the first mixed solution for 35 Fully soak for 30 minutes at ℃, so that the inorganic raw materials are filled in the pore structure of the high-porous polyethylene skeleton, and the treated substrate is obtained.

[0087] (3) With acetone as solvent, the polymer electrolyte polymethyl methacrylate and lithium salt LiAsF 6 Mix evenly to obtain a uniform solution, which is the second mixed solution (the mass concentration of the polymer electrolyte is 2.5 g / L).

[0088] (4) pouring the second mixed solution obtained above into the treate...

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Abstract

The invention provides a solid electrolyte and a preparation method thereof, and a lithium ion battery. The solid electrolyte includes a porous polymer substrate, inorganic filler located in pores ofthe porous polymer substrate, and a modifier located on the surface of the porous polymer substrate and the modifier includes a polymer electrolyte and an alkali metal salt. The preparation method comprises the following steps: (1) filling the inorganic filler into the pores of the porous polymer substrate, to obtain a treated substrate; and (2) assembling the polymer electrolyte and the alkali metal salt on the surface of the treated substrate in the step (1), to obtain the solid electrolyte. The solid electrolyte has high ionic conductivity and high mechanical strength.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to an electrolyte and a preparation method thereof, in particular to a solid electrolyte, a preparation method thereof and a lithium ion battery. Background technique [0002] High-performance, safe and economical energy storage methods are the pursuit goals in many fields, and people place their hopes on the rapidly developing secondary lithium-ion batteries and new materials. With the continuous improvement of the safety and high energy density requirements of lithium-ion batteries, people are gradually turning their attention to all-solid-state lithium-ion batteries. Replacing traditional liquid electrolytes with solid electrolytes is the fundamental way to obtain all-solid-state lithium-ion batteries with high energy density, safety and long cycle life. [0003] Solid electrolytes include colloidal polymer electrolytes, all-solid polymer electrolytes, and inorganic solid electr...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/0525H01M10/056H01M2300/0065Y02E60/10
Inventor 褚林波江柯成张文娟姜斌李艾橘
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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