Ionic-liquid-base polymer electrolyte

An ionic liquid and polymer technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as high freezing point, potential safety hazards, and easy decomposition and deterioration of electrolytes.

Active Publication Date: 2010-07-07
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The liquid electrolyte widely used at present has the advantage of high conductivity, but because it contains flammable and volatile organic solvents, it releases flammable gases during charging and discharging, especially under certain unconventional working conditions (such as high power Charge and discharge, overcharge and overdischarge, etc.) to generate a lot of heat will accelerate the generation of gas, resulting in increased internal pressure of the ...

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  • Ionic-liquid-base polymer electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0020] After drying organic borate lithium (a) and urea, put them into a glove box, weigh 10 g and 20 g of samples respectively, mix them in a weighing bottle, and stir fully at room temperature to form a homogeneous liquid to obtain an ionic liquid. The melting point was -25°C measured by DSC2010 differential scanning calorimeter; the conductivity (25°C) was measured as 1.6mS / cm by AC impedance method using CHI660a electrochemical workstation.

[0021]Based on the good electrochemical and thermal properties of the above-mentioned ionic liquid, it is combined with a porous polyoxyethylene membrane, and the conductivity at room temperature can reach 0.4mS / cm at 25°C; the conductivity of the sample is measured at different temperatures, and the conductivity varies with temperature. The curvilinear relationship fits the Arrhenius equation.

Embodiment 2

[0023] Dry organic borate lithium (a) and acetamide and put it in a glove box, weigh 10g and 20g samples respectively, mix them in a weighing bottle, and stir them fully at room temperature to form a homogeneous liquid to obtain an ionic liquid. The conductivity (25° C.) was measured as 2.7 mS / cm by AC impedance method using CHI660a electrochemical workstation.

[0024] Based on the good electrochemical and thermal properties of the above-mentioned ionic liquid, when it is combined with a porous polyoxyethylene membrane, the conductivity at room temperature can reach 0.9mS / cm; the conductivity of the sample is measured at different temperatures, and the conductivity varies with temperature. The curvilinear relationship fits the Arrhenius equation.

Embodiment 3

[0026] Based on the good electrochemical and thermal properties of the ionic liquid prepared in Example 2, it is compounded with a polyacrylonitrile membrane, and the conductivity at room temperature can reach 0.85mS / cm at 25°C; the conductivity of the sample is measured at different temperatures, and the conductivity varies with The relationship of the temperature change curve conforms to the Arrhenius equation.

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Abstract

An ionic liquid material, which is formed by the reaction of organic lithium borates or lithium aluminates and organic compounds containing amido functional groups, is used as a base and compounded with polymer materials to obtain the all-solid-state or gel-state polymer electrolyte material. The polymer electrolyte material has the advantages of favorable thermostability and favorable electrochemical performance. The addition reaction is carried out by regulating the composition of the ionic liquid and the proportion of ionic liquid to polymers and adding a right amount of plasticizer; or the conducting salts and the polymer materials containing amido functional groups are compounded to directly prepare the gel-state or all-solid-state polymer electrolyte with favorable performance. The polymer electrolyte has wide application prospects in the fields of chemical energy sources and especially new electrochemical energy storage systems aiming at high power, high energy density and high security requirement.

Description

technical field [0001] The invention belongs to the technical field of electrolyte materials, and is mainly oriented to high-power, high-energy-density power batteries, lithium-ion batteries, electrochemical supercapacitors, lithium-sulfur batteries and other high-energy batteries and applications in the technical fields of electronic equipment. technical background [0002] Ordinary ionic compounds are solid at room temperature due to strong ionic bonds, and have high melting point, boiling point and hardness. The introduction of large and asymmetric anions and cations will destroy the original ordered crystal structure due to steric hindrance, and the interaction between ions will be reduced to form salts that are liquid at room temperature, that is, room temperature molten salts (ionic liquids, Ionic liquids). Ionic liquids are liquids composed entirely of ions, and are liquid salts at low temperatures (<100°C), generally composed of organic cations and inorganic anion...

Claims

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Application Information

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IPC IPC(8): C08L71/02C08L33/20C08L27/16C08L27/20C08L33/10C08L23/06C08L23/12C08L77/02C08L77/06C08K5/55C08K5/10C08K5/21C08K5/20C08K5/3432C08K5/3415C08K5/3472H01M10/0565
CPCY02E60/12Y02E60/10
Inventor 陈人杰吴锋李丽张蓉谢曼陈实王国庆
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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