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Preparation technology of solid-state lithium ion battery

A lithium-ion battery and preparation process technology, which is applied in the field of solid-state lithium-ion battery preparation technology, can solve the problems of difficult preparation process of thin ceramic sheets, poor contact between ceramic sheets and positive and negative electrodes, and low ion conductivity, etc. Application prospects and advantages, excellent electrochemical performance, and the effect of high ionic conductivity

Active Publication Date: 2018-11-16
SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Inorganic ceramic electrolytes have attracted the attention of researchers due to their ultra-high conductivity and wide electrochemical window. However, the preparation process of thin ceramic sheets is too difficult and complicated, and the contact between the prepared ceramic sheets and the positive and negative electrodes is poor. Very poor, which greatly limits its application in actual production
Polymer electrolytes have been widely studied because of their good flexibility, which makes the interface between the electrolyte and the electrode good. However, their low ionic conductivity limits their further development.
Therefore, it is a great challenge to prepare an all-solid-state lithium-ion battery with both high ionic conductivity and good interfacial contact.

Method used

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  • Preparation technology of solid-state lithium ion battery

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Effect test

Embodiment 1

[0019] Such as figure 1 Shown: the preparation technology of a kind of solid-state lithium-ion battery of the present invention, comprises the following steps: Step 1: the lithium lanthanum zirconium oxygen that mass percent is doped with tantalum of 35wt%, the polytetrafluoroethylene emulsion of 5wt% and 10wt% Lithium bistrifluoromethanesulfonylimide was mixed evenly in 50wt% nitrogen methyl pyrrolidone solvent to obtain a coating slurry, which was respectively coated on the surface of the positive electrode sheet and the negative electrode sheet, and dried to obtain an inorganic coating with a coating thickness of 10 μm. Integrated electrode material coated with ceramic electrolyte;

[0020] Step 2: Stir and mix polyether silane with a mass percentage of 50wt%, 40wt% lithium bistrifluoromethanesulfonimide, and 10wt% ethylene carbonate to obtain a polymer solid electrolyte, which is respectively coated on the inorganic ceramic electrolyte On the surface of the electrode, an ...

Embodiment 2

[0024] Such as figure 1 Shown: the preparation technology of a kind of solid-state lithium ion battery of the present invention, comprises the following steps: Step 1: the lithium hexafluorophosphate that mass percent is 45wt% lithium lanthanum titanium oxide, 5wt% polymethyl methacrylate and 20wt% lithium hexafluorophosphate 30wt% nitrogen methyl pyrrolidone solvent is mixed uniformly to obtain a coating slurry, which is respectively coated on the surface of the positive electrode sheet and the negative electrode sheet, and dried to obtain an integrated electrode material coated with an inorganic ceramic electrolyte with a coating thickness of 50 μm;

[0025] Step 2: Stir and mix 40 wt% polymethyl methacrylate, 55 wt% lithium tetrafluoroborate and 15 wt% dimethyl carbonate to obtain a polymer solid electrolyte, which is coated on electrodes coated with inorganic ceramic electrolytes On the surface, an electrode with a double solid electrolyte with a polymer solid electrolyte ...

Embodiment 3

[0029] Such as figure 1 Shown: the preparation technology of a kind of solid-state lithium ion battery of the present invention, comprises the following steps: Step 1: the mass percentage is the lithium lanthanum zirconium oxygen of 20wt%, the polyvinylidene fluoride emulsion of 10wt% and the tetrafluoroethylene of 10wt% Lithium borate is uniformly mixed in 60wt% nitrogen methyl pyrrolidone solvent to obtain a coating slurry, which is respectively coated on the surface of the positive electrode sheet and the negative electrode sheet, and dried to obtain an inorganic ceramic electrolyte-coated integrated electrode with a coating thickness of 100 μm Material;

[0030] Step 2: Stir and mix perfluoropolyether with a mass percentage of 60wt%, 35wt% lithium dioxalate borate, and 5wt% ethyl methyl carbonate to obtain a polymer solid electrolyte, which is coated on the electrode surface coated with an inorganic ceramic electrolyte, Obtain an electrode with a double solid electrolyte ...

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Abstract

The invention discloses a preparation technology of a solid-state lithium ion battery. The preparation technology comprises the following steps: step one, uniformly mixing inorganic ceramic electrolyte powder, a binding agent and lithium salt in an organic solvent, thus obtaining coating slurry; respectively coating the surfaces of a positive plate and a negative plate with the coating slurry; drying, thus obtaining an integrated electrode material of which the coating thickness is 10 to 100 mum and which is coated with the inorganic ceramic electrolyte . The preparation technology disclosed by the invention has the advantages that dual-solid-state electrolyte structure is adopted, electrolyte in the structure integrates an all-solid-state lithium ion battery having high ionic conductivityand excellent interface contact performance, and the all-solid-state lithium ion battery has higher specific capacity and excellent cycling stability; the preparation method is simple, the cost is low, the electrochemical performance is excellent, and a wide application prospect and advantages are obtained.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, and relates to a preparation process of a solid-state lithium-ion battery. Background technique [0002] Since the birth of the first commercially applied lithium-ion battery in the 1990s, lithium-ion batteries have been widely used in mobile electronic devices, power tools, and small energy storage devices due to their advantages such as high energy density, high output power, and no memory effect. fields are widely used. With the application of lithium-ion batteries in power vehicles, lithium-ion batteries with high safety and high safety have become a research hotspot at home and abroad. Unlike traditional liquid lithium-ion batteries, all-solid-state lithium-ion batteries can fundamentally solve battery safety issues because they do not contain liquid organic solvents. [0003] Inorganic ceramic electrolytes have attracted the attention of researchers due to their ultra-high c...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0562H01M10/0565H01M10/058H01M2220/20H01M2300/0068H01M2300/0082Y02E60/10Y02P70/50
Inventor 李峥冯玉川何泓材瞿根龙李伟闫平杨帆南策文
Owner SUZHOU QINGTAO NEW ENERGY TECH CO LTD
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