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Organic-inorganic composite electrolyte with three-dimensional bicontinuous conductive phase and preparation method thereof, and application of organic-inorganic composite electrolyte with a three-dimensional bicontinuous conductive phase

An inorganic composite and conductive phase technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, electrolytes, etc., can solve problems such as limited conductivity and low aspect ratio

Inactive Publication Date: 2019-08-09
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, almost all organic-inorganic composite electrolytes use organic matter as the main body, and the performance of the electrolyte is improved by doping different inorganic fillers such as nanoparticles and nanowires, but these fillers have a low aspect ratio, making Li + The transmission path is short and isolated, and the improvement of conductivity is limited

Method used

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  • Organic-inorganic composite electrolyte with three-dimensional bicontinuous conductive phase and preparation method thereof, and application of organic-inorganic composite electrolyte with a three-dimensional bicontinuous conductive phase
  • Organic-inorganic composite electrolyte with three-dimensional bicontinuous conductive phase and preparation method thereof, and application of organic-inorganic composite electrolyte with a three-dimensional bicontinuous conductive phase
  • Organic-inorganic composite electrolyte with three-dimensional bicontinuous conductive phase and preparation method thereof, and application of organic-inorganic composite electrolyte with a three-dimensional bicontinuous conductive phase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]The sulfide electrolyte Li 6 P.S. 5 X (X is one or more of Cl, Br, I) and pore-forming agent P 2 S 5 According to the mass ratio of 1:1, it was accurately weighed into a mortar, and after it was ground evenly, 0.1 g was taken and placed in a ø10 mm tableting mold. The mixture was pressed into sheets with a thickness of 0.5 mm and a diameter of 10 mm under a pressure of 10 MPa. Place this slice in a quartz tube, 400 o C sintered for 8h to obtain three-dimensional porous Li 6 P.S. 5 X (X is one or more of Cl, Br, I) electrolyte sheet. Align LiTFSI and PEO according to [EO] / [Li + ] = 16 : 1 to prepare a 20 wt% acetonitrile solution, and magnetically stirred for 24 h to make the solution evenly mixed. Take the above solution and add it dropwise to the three-dimensional porous Li 6 P.S. 5 X (X is one or more of Cl, Br, I) on electrolyte sheet, 40 o C. After vacuum drying for 4 hours, repeat the above-mentioned dripping solution and drying process again until the el...

Embodiment 2

[0030] The sulfide electrolyte Li 10 m x P 3-x S 12 (0 ≤ x ≤ 2, M= Si, Ge or Sn) and pore-forming agent S according to the mass ratio of 1:1, accurately weighed into the mortar, after grinding evenly, take 0.1 g and put it into a ø10 mm tablet in the mold. The mixture was pressed into sheets with a thickness of 0.5 mm and a diameter of 10 mm under a pressure of 10 MPa. Place this slice in a quartz tube, 500 o C sintered for 10 h to obtain three-dimensional porous Li 10 m x P 3-x S 12 (0 ≤ x ≤ 2, M= Si, Ge or Sn) electrolyte sheet. LiClO 4 and PAN were configured into a 15 wt% toluene solution, and magnetically stirred for 24 h to make the solution evenly mixed. Take the above solution and add it dropwise to the three-dimensional porous Li 10 m x P 3-x S 12 (0 ≤ x ≤ 2, M= Si, Ge or Sn) on-chip electrolyte, 80 o After C vacuum drying for 4 h, repeat the above drop solution and drying process again until the electrolyte sheet no longer increases in weight. The li...

Embodiment 3

[0032] The sulfide electrolyte Li 2 S:(1-x)P 2 S 5 (x=0.7 ~ 0.8) and pore-forming agent SeS 2 According to the mass ratio of 1:1, it was accurately weighed into a mortar, and after it was ground evenly, 0.1 g was taken and placed in a ø10 mm tableting mold. The mixture was pressed into sheets with a thickness of 0.5 mm and a diameter of 10 mm under a pressure of 10 MPa. Place this slice in a quartz tube, 400 o C sintered for 8 h to obtain three-dimensional porous Li 2 S:(1-x)P 2 S 5 (x=0.7 ~ 0.8) Electrolyte sheet. LiDFOB and PVDF were prepared into 18 wt% acetonitrile solution, and stirred for 24 h to make the solution evenly mixed. Take the above solution and add it dropwise to the three-dimensional porous Li 2 S:(1-x)P 2 S 5 (x=0.7 ~ 0.8) on electrolyte sheet, 40 o After C vacuum drying for 4 h, repeat the above drop solution and drying process again until the electrolyte sheet no longer increases in weight. The lithium ion conductivity of the composite electro...

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Abstract

The invention relates to a battery technology, in particular to an organic-inorganic composite electrolyte with a three-dimensional bicontinuous conductive phase and preparation method thereof, and application of an organic-inorganic composite electrolyte with a three-dimensional bicontinuous conductive phase. The organic-inorganic composite electrolyte comprises a sulfide electrolyte skeleton having a three-dimensional structure and a polymer filled in the three-dimensional structure. The structure allows lithium ions to have a bicontinuous transmission channel, compared to a common mode of filling inorganic substances into polymers, the structure allows the lithium ions to have a long-range and continuous rapid transmission channel so as to improve the conductivity and the ion mobility of the composite electrolyte. The organic-inorganic composite electrolyte with a three-dimensional bicontinuous conductive phase has the ion conductivity of 2*10<-4>-1*10<-3> Scm<-1>, has the transference number of ions up to 0.6-0.7, and has the electrochemical window higher than 4.6V vs. L1+ / Li. The structure enhances the deformation resistance of the sulfide electrolyte.

Description

technical field [0001] The invention relates to battery technology, in particular to an organic-inorganic composite electrolyte with a three-dimensional bicontinuous conductive phase, its preparation and its application in an all-solid lithium battery. Background technique [0002] Lithium-ion batteries have become the main energy storage devices for portable electronics, electric vehicles, and drones due to their high energy and power density, low self-discharge rate, and long cycle life. However, due to the flammable electrolyte used in commercial Li-ion batteries, the widespread application of Li-ion batteries faces severe safety issues. Compared with commercial lithium-ion batteries using liquid electrolytes, all-solid-state lithium batteries use solid electrolytes, which have attracted widespread attention from academia and industry because of their inherent incombustibility and high mechanical strength. Batteries are an important way to realize the application of high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565H01M10/058H01M2300/0094Y02E60/10Y02P70/50
Inventor 崔光磊王延涛鞠江伟徐红霞崔龙飞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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