Preparation method of full-solid-state nano composite polymer electrolyte

A nanocomposite and polymer technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of limiting the electrical properties of composite polymer electrolytes, uneven dispersion, and easy agglomeration, etc. Achieve good cycle stability, smooth surface, high room temperature conductivity and ion mobility

Inactive Publication Date: 2013-01-23
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Inorganic nanofillers are prone to agglomeration and uneven dispersion in the polymer matr...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] After the graphene oxide is functionalized, it is uniformly mixed with the matrix, lithium salt, and solvent at room temperature to obtain a composite sol, and the solvent is automatically volatilized and dried under the protection of nitrogen to obtain a solid polymer electrolyte membrane.

[0027] Step (1): Weigh 100mg of graphene oxide and disperse it in 200ml of tetrahydrofuran, and process it under 30kHz ultrasonic wave for 10 minutes to obtain a graphene oxide dispersion, add 2g of polyethylene glycol monomethyl ether, and process it under 30kHz ultrasonic wave for 10 minutes , add 50 mg of catalyst dicyclohexylcarbodiimide, stir mechanically at room temperature for 2 hours, raise the temperature to 60°C, stir and reflux for 24 hours, dilute and wash with deionization, filter with ultra-microporous membrane, and repeat with ethanol Washing and suction filtration, vacuum drying at 50°C for 48 hours to obtain functionalized graphene;

[0028] Step (2): Weigh 5mg...

Embodiment 2

[0031] After the graphene oxide is functionalized, it is uniformly mixed with the matrix, lithium salt, and solvent at room temperature to obtain a composite sol, and the solvent is naturally volatilized and dried under the protection of nitrogen to obtain a solid polymer electrolyte membrane.

[0032] Step (1): Weigh 100 mg of graphene oxide and disperse it in 200 ml of tetrahydrofuran, and process it under 40 kHz ultrasonic wave for 5 minutes to obtain a graphene oxide dispersion, add 1.5 g of polyethylene glycol monomethyl ether, and process it under 40 kHz ultrasonic wave for 5 minutes. Minutes, add 50 mg of dicyclohexylcarbodiimide as a catalyst, mechanically stir for 4 hours at room temperature, raise the temperature to 60°C, stir and reflux for 24 hours, dilute and wash with deionization, filter with ultra-microporous membrane, and then use Repeated washing and suction filtration with ethanol, vacuum drying at 50°C for 48 hours to obtain functionalized graphene;

...

Embodiment 3

[0036] After the graphene oxide is functionalized, it is uniformly mixed with the matrix, lithium salt, and solvent at room temperature to obtain a composite sol, and the solvent is automatically volatilized and dried under nitrogen protection to obtain a solid polymer electrolyte membrane.

[0037]Step (1): Weigh 100 mg of graphene oxide and disperse it in 200 ml of tetrahydrofuran, and process it under 40 kHz ultrasonic wave for 5 minutes to obtain a graphene oxide dispersion, add 1.5 g of polyethylene glycol monomethyl ether, and process it under 40 kHz ultrasonic wave for 5 minutes. Minutes, add 50 mg of dicyclohexylcarbodiimide as a catalyst, mechanically stir for 4 hours at room temperature, raise the temperature to 60°C, stir and reflux for 24 hours, dilute and wash with deionization, filter with ultra-microporous membrane, and then use Repeated washing and suction filtration with ethanol, vacuum drying at 50°C for 48 hours to obtain functionalized graphene;

[00...

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Abstract

The invention relates to a preparation method of a full-solid-state nano composite polymer electrolyte. The preparation method comprises the following steps of: mixing surface functional graphene, dissociated lithium salt and a polymer substrate and dissolving into an organic solvent, thereby obtaining a sol-like compound through ultrasonic treatment and mechanical blending; pouring on a Teflon template; and drying in a vacuum drying tank, thereby obtaining an electrolyte membrane. According to the invention, the full-solid-state nano composite polymer electrolyte is prepared through adding chemically modified graphene, not only room temperature conductivity is high, but also the surface is smooth and even, the internal components are uniform, and the full-solid-state nano composite polymer electrolyte is high in lithium ion transference number and electrochemical stability.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method of an all-solid composite polymer electrolyte used in lithium ion batteries. Background technique [0002] In 1973, Wright et al. first reported that the polyethylene oxide (PEO) / alkali metal salt system had ionic conductivity. In 1979, Armand et al. confirmed Wright's discovery and proposed to apply PEO-based solid polymer electrolytes to lithium-ion batteries. Replacing liquid electrolyte lithium batteries with polymer electrolytes has many advantages, mainly in high energy density and long cycle life; high reliability and ease of processing; low self-discharge; can be made into an all-plastic structure, easy to assemble; no electrolyte , there will be no leakage; it can be packaged in light plastic instead of a metal case like traditional lithium-ion batteries, which is safe to use. However, as a polymer electrolyte, pure PEO has low electrical conduc...

Claims

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Application Information

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IPC IPC(8): H01M10/0565B82Y30/00
CPCY02E60/12Y02E60/10
Inventor 王国建吴承恳戴进峰
Owner TONGJI UNIV
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