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Polymer electrolyte and preparation method and application thereof

An electrolyte and polymer technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as energy density bottlenecks of lithium-ion secondary batteries, hidden safety hazards of lithium-ion secondary batteries, internal short circuits of batteries, etc., and achieve high energy The effect of density, high toughness and high plasticity

Inactive Publication Date: 2011-04-06
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the structure of lithium-ion secondary batteries widely used at present, it still has the disadvantages of the following two aspects: (1) the electrolyte used is a liquid electrolyte (for example: LiPF 6 -EC-DMC-DEC, LiPF 6 -EC-DEC and other liquid electrolytes), which are flammable, volatile, and easy to leak out of the battery, making liquid electrolyte-based lithium-ion secondary batteries have obvious safety hazards; (2) The negative electrode used is a micron-sized ball Typed graphite, its theoretical capacity (372mA h g -1 ) is still low, making a theoretical bottleneck in the improvement of the energy density of lithium-ion secondary batteries
Among all anode materials that can be used in lithium-ion secondary batteries, metallic lithium has the highest theoretical capacity (3862mA h g -1 ), however, in the process of charging and discharging, a large number of lithium dendrites generated on its surface will penetrate the porous diaphragm and cause a short circuit inside the battery, which has serious safety problems, making it unable to directly replace the current commercial lithium Graphite anodes in ion batteries
(3) The porous separator used is easily penetrated due to the formation of dendrites, the introduction of impurity particles, etc., resulting in a short circuit inside the battery

Method used

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  • Polymer electrolyte and preparation method and application thereof
  • Polymer electrolyte and preparation method and application thereof
  • Polymer electrolyte and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, preparation No. 1 polymer electrolyte

[0028] Under ultrasonic conditions, 1.5g LiBOB, 1.24g SN (the molar ratio of SN to LiBOB is 2:1) and 0.8g nano-magnesium oxide (particle size is 10nm) were sequentially added to 150g ethanol to obtain a uniform white Suspension; Then, add 8 g of molecular weight 8×10 5 PVA (structural unit is vinyl alcohol, the molar ratio of this structural unit and lithium salt is 23.5: 1), after ultrasonic stirring for 8 hours, obtain the macromolecule suspension (viscosity is 9.5Pa. s); then, the resulting polymer suspension is evenly coated on the flat glass surface by spin coating; finally, the glass coated with the polymer suspension is dried at 50° C. for 10 hours in a nitrogen atmosphere Polymer electrolyte membrane No. 1 was obtained.

Embodiment 2

[0029] Embodiment 2, preparation No. 2 polymer electrolyte

[0030] Under the condition of stirring, 2g LiBOB and 3g PC (the molar ratio of PC and LiBOB is 3.3: 1) are successively added in 200g N-methylpyrrolidone, obtain uniform transparent solution; Then, add 12g molecular weight to transparent solution 1×10 5PVdF (the structural unit is 1,1-difluoroethylene, the molar ratio of the structural unit to the lithium salt is 18:1), after stirring for 8 hours, a uniform milky white polymer solution (viscosity is 5.2Pa·s); Next, apply the obtained polymer solution on a flat glass surface by doctor blade coating; finally, dry the glass coated with the polymer solution at 80°C for 15 hours under a vacuum condition of -90KPa The No. 2 polymer electrolyte was obtained.

Embodiment 3

[0031] Embodiment 3, preparation No. 3 polymer electrolyte

[0032] Under the condition of ultrasonic stirring, 1.8g LiBOB and 2g nano-alumina (particle diameter is 100 nanometers) are added successively to 120g by acetone, N,N-dimethylformamide and petroleum ether (volume ratio is 1: 1: 2) In the mixed solution of composition, obtain uniform suspension; Then, add 14g molecular weight to this suspension and be 1 * 10 6 PMMA (structural unit is methyl methacrylate, the molar ratio of this structural unit and lithium salt is 15: 1), after stirring for 15 hours, obtains uniform milky white polymer suspension (viscosity is 12.2Pa·s); Then, the obtained polymer solution was coated on a flat polytetrafluoroethylene surface by the doctor blade coating method; finally, the polytetrafluoroethylene plate coated with the polymer suspension was dried in a carbon dioxide atmosphere at 60°C for 13 After 1 hour, No. 3 polymer electrolyte was obtained.

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Abstract

The invention discloses polymer electrolyte and a preparation method and application thereof. The provided polymer electrolyte consists of a high polymer matrix, lithium salt, an organic small molecular plasticizer and / or inorganic superfine nanoparticles. The provided polymer electrolyte has high ionic conductivity, high toughness and high-temperature resistance, and when the polymer electrolyte is used as lithium ion secondary battery electrolyte, the structure of a commercial lithium ion secondary battery is simplified, the structure of the lithium ion secondary battery is enriched, and simultaneously the potential safety hazard in the traditional lithium ion secondary battery can be effectively avoided. Meanwhile, in the process of preparing a lithium battery from the provided polymer electrolyte, the conventional commercial micron-sized graphite anode can be replaced by a metal lithium foil, so the prepared novel lithium ion battery has higher energy density and power density.

Description

technical field [0001] The invention relates to a polymer electrolyte and its preparation method and application. Background technique [0002] Due to the advantages of high working voltage, high energy density, good cycle performance, and small self-discharge, lithium-ion secondary batteries have been widely used in energy storage and conversion in technical fields such as notebook computers, mobile phones, and UPS. Industries such as automobiles and vehicle batteries also have broad application prospects. However, from the structure of lithium-ion secondary batteries widely used at present, it still has the disadvantages of the following two aspects: (1) the electrolyte used is a liquid electrolyte (for example: LiPF 6 -EC-DMC-DEC, LiPF 6 -EC-DEC and other liquid electrolytes), which are flammable, volatile, and easy to leak out of the battery, making liquid electrolyte-based lithium-ion secondary batteries have obvious safety hazards; (2) The negative electrode used is ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565C08L33/12C08L27/16C08L27/18C08L71/02C08L53/00C08L29/04C08L29/14C08K5/098C08K3/22C08K3/34
CPCY02E60/12Y02E60/10
Inventor 郭玉国吴兴隆万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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