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Composite solid-state polymer electrolyte and all-solid-state lithium battery

A technology of solid polymers and electrolytes, applied in solid electrolytes, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of few correlation reports, achieve low raw material cost, simple preparation process, obvious cycle stability and high Effect of rate charge and discharge performance

Active Publication Date: 2017-05-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above literature still uses inorganic substances as fillers to improve the compatibility of electrolytes and lithium-based negative electrodes.
There are still few reports on the use of organic fillers to improve the compatibility of solid electrolytes and lithium-based anodes

Method used

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  • Composite solid-state polymer electrolyte and all-solid-state lithium battery
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  • Composite solid-state polymer electrolyte and all-solid-state lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Composite solid polymer electrolytes were prepared by melting hot pressing method. First, polyacrylonitrile (PAN), CB[5] and lithium salt LiTFSI were thoroughly mixed at a mass ratio of 5:4:4 in an argon glove box, then placed in a vacuum oven at 80 °C for 12 h, and then transferred to In a polytetrafluoroethylene mold, hold the pressure at 65°C and 10MPa pressure for 2h to obtain a composite solid polymer electrolyte with a thickness of 50μm. The surface morphology of the electrolyte membrane was observed by scanning electron microscopy (SEM). The surface of the electrolyte membrane was smooth and even, and the particles were uniformly dispersed. The electrochemical window of the prepared electrolyte film was 4.8V; the Li / / Li symmetric battery was assembled, and the interface impedance of the symmetric battery was measured at 60°C at different times, and the interface impedance stabilized at 66Ω after 7 days. Using LiCoO 2 Assemble an all-solid lithium battery, the ba...

Embodiment 2

[0031] The composite solid polymer electrolyte was prepared by solution casting method. Firstly, polyethylene dithiol, CB[6] and lithium salt LiFSI with a mass ratio of 8:4:1 were fully dissolved in acetonitrile in an argon glove box, stirred for 12 hours to obtain a uniform viscous solution, and then the solution Cast into a polytetrafluoroethylene mold, dry at room temperature for 48 hours, and vacuum dry at 30°C for 48 hours to remove residual solvents to obtain a composite solid polymer electrolyte with a thickness of 60 μm. The surface morphology of the electrolyte membrane was observed by scanning electron microscopy (SEM). The surface of the electrolyte membrane was smooth and even, and the particles were uniformly dispersed. The electrochemical window of the prepared electrolyte film was 4.6V; a symmetrical Li / / Li symmetrical battery was assembled, and the interface impedance of the symmetrical battery at different times was measured at 60°C, and the interface impedanc...

Embodiment 3

[0033] Composite solid polymer electrolytes were prepared by melting hot pressing method. First, polyethylene oxide (PEO), CB[7] and lithium salt LiClO were mixed in an argon glove box 4 After fully mixing according to the mass ratio of 5:4:8, place it in a vacuum drying oven at 90°C for 5h, then transfer it to a polytetrafluoroethylene mold, hold the pressure at 80°C and 5MPa pressure for 15min, and obtain a composite solid state with a thickness of 70μm. polymer electrolyte. The surface morphology of the electrolyte membrane was observed by scanning electron microscopy (SEM). The surface of the electrolyte membrane was smooth and even, and the particles were uniformly dispersed. The electrochemical window of the prepared electrolyte film was 4.5V; a lithium-nickel alloy symmetric battery was assembled, and the interface impedance of the symmetric battery was measured at 60°C at different times, and the interface impedance stabilized at 74Ω after 7 days. Using LiFePO 4 Ass...

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Abstract

The invention discloses a composite solid-state polymer electrolyte and an all-solid-state lithium battery. The composite solid-state polymer electrolyte comprises organic micro-nano porous granules, a polymer having lithium ion conducting capability and a lithium salt; the composite solid-state polymer electrolyte takes the organic micro-nano porous granules as filler; and natural compatibility exists between the organic filler and the polymer matrix. The composite solid-state polymer electrolyte disclosed by the invention has high electrochemical window (4.2-5V), excellent interface stability with a lithium-based negative electrode material, and low interface impedance. The all-solid-state lithium battery, assembled by the composite solid-state polymer electrolyte disclosed by the invention, is high in cycling performance and rate capability.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a solid polymer electrolyte and its preparation and application method. Background technique [0002] With the continuous development of the world economy, the contradiction between energy supply and demand has become increasingly acute. At the same time, a series of environmental problems such as air pollution and smog caused by the use of fossil fuels represented by coal, oil and natural gas have caused serious damage to the human living environment. The development of green energy such as solar energy, wind energy and geothermal energy has become an inevitable trend of energy development. Energy storage devices are also an important prerequisite for realizing the use and promotion of green energy. The development of new high-efficiency energy storage devices has important strategic significance for improving the structure of energy use, promoting the developme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/0068H01M2300/0082Y02E60/10
Inventor 范丽珍陈龙
Owner UNIV OF SCI & TECH BEIJING
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