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A kind of organic-inorganic hybrid polymer solid electrolyte material and its application

A technology of solid electrolyte and solid electrolyte membrane, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as poor safety performance and poor cycle stability, and achieve enhanced mechanical properties, stable cycle performance, and increased migration rate Effect

Active Publication Date: 2016-08-10
王海斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the problem of poor cycle stability and poor safety performance of lithium-ion batteries in the prior art under high temperature (greater than 60°C) and high rate conditions, and aims to provide a lithium ion battery for the preparation of lithium ion batteries under high temperature and high rate conditions. Organic-inorganic hybrid polymer solid electrolyte materials for batteries with high charge-discharge specific capacity and stable electrochemical cycle performance

Method used

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  • A kind of organic-inorganic hybrid polymer solid electrolyte material and its application
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Examples

Experimental program
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Effect test

Embodiment 1

[0033] Prepare a polymer electrolyte whose components are MIL-53(Al), polyethylene oxide (PEO), and lithium bistrifluoromethanesulfonimide (LiTFSI). The specific preparation process is as follows:

[0034] Synthesis of MOF: According to the technical requirements, first synthesize MIL-53 (Al), according to the molar ratio of aluminum nitrate nonahydrate (Al (NO 3 ) 3 9H 2 O): Terephthalic acid (H 2 BDC): N-N dimethylformamide (DMF): deionized water (H 2 O)=1:0.5:153:80, add 1.5g (4mmol) Al(NO 3 ) 3 9H 2 O, 0.664 g (2 mmol) H 2 BDC, 15mLDMF and 5.76mLH 2 O, react in an autoclave for 48 hours at 150°C and a stirring speed of 400r / min to obtain a white milky substance, which is washed with deionized water at a volume ratio of 1:1, filtered, and vacuum-dried at 130°C After 24 hours, a white powder of MIL-53(Al) nanoparticles was obtained, and the particle size range was distributed between 5 nm and 20 μm.

[0035] Film formation: Dissolve 0.1g of the prepared white powder...

Embodiment 2

[0038] Prepare the same polymer electrolyte as in Example 1 and assemble into LiFePO 4 Half-battery, 1C rate charge and discharge test at 120°C, the first charge specific capacity is 131.1mAh / g, the discharge specific capacity is 128.4mAh / g, the efficiency is 97.9%, and the charge specific capacity after 200 cycles is 138.3mAh / g g, the discharge specific capacity is 137.8mAh / g, and the efficiency is 99.7%. The 5C rate charge and discharge test was carried out at 120°C. The first charge specific capacity was 133.8mAh / g, the discharge specific capacity was 131.2mAh / g, and the efficiency was 98.1%. After 200 cycles, the charge specific capacity is 108.7mAh / g, the discharge specific capacity is 107.8mAh / g, and the efficiency is 99.1%. Specific cycle test data such as figure 1 (a) (b) shown.

Embodiment 3

[0040] The preparation component is MIL-53 (Cr), LiBOB, the polymer electrolyte membrane of polyvinylidene fluoride, and its preparation method is as follows:

[0041] Synthesis: The first is the preparation of MIL-53(Cr), according to the molar ratio of 1:2, weigh 1.6g (4mmol) of Cr(NO 3 ) 3 9H 2 O, and 0.332g (2mmol) terephthalic acid (H 2 BDC) into the flask, add 5mL of deionized water and 1mL of hydrofluoric acid (HF), stir for 60min at a speed of 400r / min, react in a polytetrafluoroethylene autoclave at 220°C for 72h, cool, and use 50 mL of deionized water was left to wash for 12 hours, filtered, and vacuum-dried at 120° C. for 12 hours to obtain white nanoparticles MIL-53 (Cr), with particle sizes ranging from 5 nm to 20 μm.

[0042] Membrane production: Weigh 0.15 g of white nanoparticles MIL-53 (Cr) and 0.2 g of LiBOB, dissolve in 15 mL of acetonitrile, stir for 2 h, add 0.4 g of PVDF to the above solution, stir for 48 h, and rotate at 700 r / min. First, the solvent...

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Abstract

The invention discloses an organic-inorganic hybrid polymeric solid electrolyte material and the application thereof. The polymeric solid electrolyte material consists of a lithium-conducting polymer, a metal-organic framework and a lithium salt. The solid electrolyte material is applied to the preparation of a solid electrolyte membrane of an all-solid lithium ion battery, and the all-solid lithium ion battery assembled by the electrolyte membrane prepared from the solid electrolyte material has a stable relatively-high charge-discharge specific capacity under a high-temperature and high-rate condition and is good in cycle performance.

Description

technical field [0001] The invention relates to an organic-inorganic hybrid polymer solid electrolyte material and application thereof, belonging to the field of lithium ion battery materials. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, small size, and no memory effect, making them one of the energy sources with the most potential for development. At present, it has been used in many fields such as military defense, electric vehicles, portable digital equipment, etc., and the requirements for its performance are getting higher and higher. At present, most commercial lithium-ion batteries at home and abroad use organic liquid electrolytes. Since the electrolyte is liquid, it is prone to fire and combustion accidents, so its operating temperature is generally limited to below 60°C. In some extreme environments and special fields, such as oil exploration, underground operations, medical industry, etc., o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCY02E60/10
Inventor 刘晋李劼朱凯林月刘业翔
Owner 王海斌
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