Halogen salt modified composite solid electrolyte as well as preparation method and application thereof

A technology of solid electrolyte and solid electrolyte membrane, which is applied in the direction of composite electrolyte, electrolyte storage battery manufacturing, non-aqueous electrolyte storage battery, etc., can solve problems such as difficult formation of lithium-conducting channels, achieve widening electrochemical stability window, improve chemical stability, and prevent The effect of battery overcharging

Inactive Publication Date: 2021-01-05
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that in the existing composite electrolyte, the inorganic solid electrolyte is usually dispersed in the form of nano-scale or micron-scale particles, and it is difficult to form a continuous lithium-conducting channel. At the same time, the composite

Method used

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  • Halogen salt modified composite solid electrolyte as well as preparation method and application thereof
  • Halogen salt modified composite solid electrolyte as well as preparation method and application thereof
  • Halogen salt modified composite solid electrolyte as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A halide-salt-modified composite solid-state electrolyte composed of Li 6.4 La 3 Zr 2 Al 0.2 o 12 Nanofibers, polyethylene oxide PEO, polypropylene carbonate PPC, lithium bistrifluoromethanesulfonimide LiTFSI and LiF. The thickness is 50 μm, and the ionic conductivity at room temperature is 7.6×10 -4 S / cm.

[0041]Among them Li 6.4 La 3 Zr 2 Al 0.2 o 12 The mass ratio of nanofibers in the composite solid electrolyte is 40%.

[0042] The mass ratio of polypropylene carbonate PPC in the composite solid electrolyte is 24%.

[0043] The mass ratio of polyethylene oxide PEO in the composite solid electrolyte is 24%.

[0044] The mass ratio of lithium bistrifluoromethanesulfonimide LiTFSI in the composite solid electrolyte is 9%.

[0045] The mass ratio of LiF in the composite solid electrolyte is 3%.

[0046] A method for preparing a halogen-salt-modified composite solid electrolyte, the specific preparation method is as follows: including the preparation of ga...

Embodiment 2

[0063] A halide-salt-modified composite solid-state electrolyte composed of Li 6.75 La 3 Zr 1.75 Nb 0.25 o 12 Nanofiber, polyethylene oxide PEO, polypropylene carbonate PPC, lithium perchlorate LiClO 4 and LiCl composition. The thickness is 100 μm, and the ionic conductivity at room temperature is 2.3×10 -4 S / cm.

[0064] Among them Li 6.75 La 3 Zr 1.75 Nb 0.25 o 12 The mass ratio of nanofibers in the composite solid electrolyte is 10%.

[0065] The mass ratio of polypropylene carbonate PPC in the composite solid electrolyte is 14%.

[0066] The mass ratio of polyethylene oxide PEO in the composite solid electrolyte is 60%.

[0067] Lithium perchlorate LiClO 4 The mass ratio in the composite solid electrolyte is 15%.

[0068] The mass ratio of LiCl in the composite solid electrolyte is 1%.

[0069] A method for preparing a halogen-salt-modified composite solid-state electrolyte, the specific preparation method is as follows: including the preparation of garnet-...

Embodiment 3

[0086] A halide-salt-modified composite solid-state electrolyte composed of Li 5.5 La 3 Zr 2 Ga 0.5 o 12 Nanofiber, polyethylene oxide PEO, polypropylene carbonate PPC, lithium difluorooxalate borate LiDFOB and LiBr. The thickness is 300 μm, and the ionic conductivity at room temperature is 5.9×10 -4 S / cm.

[0087] Among them Li 5.5 La 3 Zr 2 Ga 0.5 o 12 The mass ratio of nanofibers in the composite solid electrolyte is 60%.

[0088] The mass ratio of polypropylene carbonate PPC in the composite solid electrolyte is 10%.

[0089] The mass ratio of polyethylene oxide PEO in the composite solid electrolyte is 5%.

[0090] The mass ratio of lithium difluorooxalate borate LiDFOB in the composite solid state electrolyte is 20%.

[0091] The mass ratio of LiBr in the composite solid electrolyte is 5%.

[0092] A method for preparing a halogen-salt-modified composite solid-state electrolyte, the specific preparation method is as follows: including the preparation of garne...

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Abstract

The invention relates to a halogen salt modified composite solid electrolyte as well as a preparation method and application thereof. The halogen salt modified composite solid electrolyte comprises the following components: garnet type oxide nanofibers, polyoxyethylene (PEO), polypropylene carbonate (PPC), lithium salt and halogen salt. Polyoxyethylene and polypropylene carbonate are blended, so that the amorphous degree and flexibility of the polymer are improved; garnet type oxide nanofibers are utilized to provide a continuous lithium conducting channel, so that the ionic conductivity and the electrochemical stability window of a composite electrolyte are improved; a halogen salt coating is used for modifying the surface of the electrolyte, so that the redox reaction between a polypropylene carbonate and a positive electrode active material is inhibited, and the chemical compatibility between the electrolyte and the positive electrode is improved. According to the composite solid electrolyte prepared by the method, the ionic conductivity is 1*10<4>S/cm to 8*10<4>S/cm, and the room-temperature charge-discharge cycle of a constructed solid lithium battery can reach more than 50 weeks.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a halogen-salt-modified composite solid electrolyte for improving the chemical stability of a solid electrolyte and preventing battery overcharging, and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have been widely used in energy storage, power and 3C consumer fields due to their high energy density, good cycle performance, and environmental protection. Lithium-ion batteries generally use organic electrolytes, which are prone to leakage, combustion, and explosion of electrolytes under conditions such as overcharge, short circuit, and impact. Solid-state lithium-ion batteries use solid-state electrolytes instead of organic electrolytes, do not contain flammable and volatile components, have a wide electrochemical stability window, have good compatibility with metal lithium and high-voltage positive electrod...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0562H01M10/058H01M10/0525B82Y30/00B82Y40/00D01F9/08
CPCB82Y30/00B82Y40/00D01F9/08H01M10/0525H01M10/0562H01M10/0565H01M10/058H01M2300/0088Y02E60/10Y02P70/50
Inventor 屠芳芳陈冬张文杨东辉王羽平张焱刘桃松相佳媛陈建
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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