A polymer conductive fiber toughened sulfide composite electrolyte

A composite electrolyte and conductive fiber technology, applied in electrolytes, non-aqueous electrolytes, solid electrolytes, etc., can solve problems such as limiting the development and application of all-solid-state lithium-ion batteries, poor mechanical properties, and poor overall performance of organic-inorganic composite electrolytes.

Active Publication Date: 2020-07-14
中科深蓝汇泽新能源(青岛)有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention provides a sulfide composite electrolyte toughened by polymer conductive fibers to solve the problem of organic-inorganic composite electrolytes that almost use organic matter as the main body due to the low fracture strength and poor mechanical properties of inorganic electrolytes in the prior art. The overall performance of the composite electrolyte is not excellent, which limits the development and application of all-solid-state lithium-ion batteries

Method used

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  • A polymer conductive fiber toughened sulfide composite electrolyte
  • A polymer conductive fiber toughened sulfide composite electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Dissolve 1 g of polyimide and 0.2 g of LiTFSI in 10 ml of DMF, stir to dissolve completely. Move the solution into an electrospinning machine, and under the action of 30 KV voltage and gravity, the polymer is spun onto a collecting plate equipped with tiny electrodes, and after 60 s, the one-dimensional nanopolymer lithium-ion conductive fibers aligned in alignment are collected and moved into Dry in a vacuum oven at 80°C. 1.9 g Li 3 P.S. 4 Disperse in 10 ml of toluene solution, scrape-coat it on a smooth aluminum foil, and move it into a vacuum oven at 80°C to dry. After drying, the one-dimensional nanopolymer lithium-ion conductive fibers are uniformly arranged in the same direction to the Li 3 P.S. 4 On, heat-compression compounding at 300°C. Repeat the above steps of scraping-arranging fibers-hot pressing to obtain a sulfide composite electrolyte toughened by polymer conductive fibers. The thickness of the electrolyte is 200 μm, and the lithium ion conductivit...

Embodiment 2

[0025] 1 g polyetherimide and 0.2 g LiBF 4 Dissolve in 10 ml DMAC and stir to dissolve completely. The solution was filtered, defoamed, and 0.1 g min -1 The pump supply is wet spinning, and the spinneret with a diameter of 0.01 mm is selected. After solidification and stretching, it is wound and taken up by a winding machine to obtain a stable and continuous one-dimensional nanopolymer lithium ion conductive fiber. 1.9 gLi 6 P.S. 5 Cl was dispersed in 10 ml of toluene solution, scraped onto a smooth aluminum foil, and dried in a vacuum oven at 80°C. After drying, the one-dimensional nanopolymer lithium-ion conductive fibers are uniformly arranged in the same direction to the Li 6 P.S. 5 Cl, at 300 ° C hot-compression composite. Repeat the above steps of scraping-arranging fibers-hot pressing to obtain a sulfide composite electrolyte toughened by polymer conductive fibers. The thickness of the electrolyte is 200 μm, and the lithium ion conductivity of the electrolyte at ...

Embodiment 3

[0027] Dissolve 1 g of Kevlar and 0.2 g of LiBOB in 10 ml of DMAC, stir to dissolve completely. Scrape the solution on a polytetrafluoroethylene plate, dry it in a vacuum oven at 80°C, and crush it into a 100-mesh powder by ultra-cooling and low temperature. Adopt the melt spinning method, set the hot air temperature to 330°C, and the melt flow rate to 3.9 ml min -1 , the air pressure is 4 atm, the polymer is spun onto a collecting plate with tiny electrodes 15 cm away from the spinneret hole, and the aligned one-dimensional nanopolymer lithium ion conductive fibers are collected, and then moved into a 60°C oven for drying. 2.2 g Li 3 P.S. 4 Disperse in 10 ml of toluene solution, scrape-coat it on a smooth aluminum foil, and move it into a vacuum oven at 80°C to dry. After drying, the one-dimensional nanopolymer lithium-ion conductive fibers are uniformly arranged in the same direction to the Li 3 P.S. 4 On, heat-compression compounding at 300°C. Repeat the above steps o...

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Abstract

The invention discloses a polymer conductive fiber toughened sulfide composite electrolyte and its application in a room temperature all-solid lithium battery. Through bionic simulation of the toughening behavior of bamboo fiber in nature, the one-dimensional nanopolymer lithium ion conductive fiber is compounded into the sulfide inorganic fast ion conductor. The fiber length is 1‑1000 μm, the diameter is 10‑1000 nm, and they are parallel in the same direction. Arranged, the conductive fibers are evenly distributed on the surface or inside of the composite structure. This structure improves the ability of the sulfide inorganic fast ion conductor to resist stress deformation, and the fracture strength of the inorganic sulfide fast ion conductor is not higher than 0.70 MPa m 1 / 2 Increased to 1.2‑1.4 MPa m 1 / 2 . The invention also discloses an all-solid lithium battery assembled with the composite electrolyte structure.

Description

technical field [0001] The invention relates to an all-solid lithium battery technology, in particular to a polymer conductive fiber toughened sulfide composite electrolyte applied to an all-solid lithium battery. Background technique [0002] In order to solve the increasingly serious problems of energy shortage, environmental pollution, and resource depletion, lithium-ion batteries are expected to be used as power batteries for electric vehicles and energy storage batteries for new energy sources such as solar energy and wind energy. Commercial lithium-ion batteries use liquid organics as electrolytes. Liquid electrolyte (electrolyte) has the advantages of high conductivity and good wettability with the surface of electrode materials, but its electrochemical window is narrow (poor electrochemical stability), thermal stability is poor, and there is only a very thin thermoplastic between the positive and negative electrodes. Porous diaphragm barrier, there is a hidden dange...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M10/0562H01M10/0565H01M10/058
CPCH01M10/052H01M10/0562H01M10/0565H01M10/058H01M2300/0065H01M2300/0091Y02E60/10Y02P70/50
Inventor 崔光磊鞠江伟徐红霞陈兵兵王延涛崔艳艳
Owner 中科深蓝汇泽新能源(青岛)有限责任公司
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