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A kind of solid-state electrolyte and its preparation method and solid-state battery

A solid-state electrolyte and solid-state battery technology, applied in the direction of solid electrolyte, non-aqueous electrolyte, secondary battery, etc., can solve the problem of interface layer impedance reduction

Active Publication Date: 2020-07-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method has limited reduction in the impedance between the interface layers.

Method used

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  • A kind of solid-state electrolyte and its preparation method and solid-state battery
  • A kind of solid-state electrolyte and its preparation method and solid-state battery
  • A kind of solid-state electrolyte and its preparation method and solid-state battery

Examples

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preparation example Construction

[0019] The present invention also provides a method for preparing a solid electrolyte, the method comprising performing a lithiation reaction in an inert gas atmosphere with a lithium-containing substance and a solid electrolyte matrix to obtain a solid electrolyte, and the solid electrolyte matrix is ​​Li x m y P z S w , where M is one or more of Si, Ge, Sn, x+4y+5z=2w, 0<y<1.5.

[0020] Lithiated solid-state electrolytes enable M 4+ It is reduced to produce M-containing compounds with a valence of M lower than +4, which reduces the average valence state of M in the solid electrolyte and enhances its resistance to reduction. The external performance is that the lithiated solid electrolyte stabilizes the negative electrode. The performance is greatly enhanced, the negative electrode interface of the all-solid lithium battery is improved, the negative electrode interface impedance and the overall impedance of the all-solid lithium battery are reduced, and the cycle stability...

Embodiment 1

[0038] (1) Production of positive electrode sheet C

[0039] Pass 930g through LiNbO 3 Material coated LiCoO 2 Anode material (93%), 30g binder PVDF (3%), 20g acetylene black (2%), 20g conductive agent carbon fiber (2%) are added to 1500g solvent NMP (nitrogen methyl pyrrolidone), and then in a vacuum mixer Stir in medium to form a stable and uniform positive electrode slurry. The positive electrode slurry was uniformly and intermittently coated on both sides of aluminum foil (aluminum foil size: width 160 mm, thickness 16 μm), then dried at 393K, and the positive electrode sheet C was obtained after being pressed by a roller press;

[0040] (2) Production of CE

[0041] Preparation of lithiated Li 10 GeP 2 S 12 Material, will 1000g Li 10 GeP 2 S 12 , 11.8g of lithium element and stirring magnets are placed together in a glass airtight reaction vessel (1L) with a sealable channel, placed in a low-temperature constant temperature bath, and the temperature is adjusted t...

Embodiment 2

[0049] The same steps as in Example 1 were used to prepare the coated positive electrode material and lithium ion battery Y2 of this example, except that:

[0050] In step (2), the solid electrolyte used in the preparation of the positive plate solid electrolyte composite layer is 0.2:1 lithiated Li10 GeP 2 S 12 .

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Abstract

The invention provides a solid electrolyte and a preparation method thereof, and a solid state battery. The solid electrolyte comprises a compound of Li<x>M<y>P<z>S<w> and M having a valence of less than 4, wherein x, 4y and 5z sum to 2w; y is more than 0 and less than 1.5; and M is one or more selected from the group consisting of Si, Ge, and Sn. The lithiated solid electrolyte of the invention can effectively improve an interface between the electrolyte and a negative electrode, and improves the cycle life of the solid state battery.

Description

technical field [0001] The invention relates to a solid electrolyte, in particular to a solid electrolyte, a preparation method thereof, and a solid battery. Background technique [0002] Secondary lithium-ion batteries have incomparable advantages such as high energy density, high operating voltage, and good cycle performance, and are widely used in portable energy devices. At present, the widely used liquid electrolyte is easy to corrode the positive and negative electrodes, resulting in irreversible loss of battery capacity. At the same time, the heat generated by the exothermic reaction will also decompose the liquid electrolyte, thereby generating flammable gases and causing serious safety problems such as fire and explosion. The all-solid lithium secondary battery has the incomparable safety of the liquid lithium secondary battery, and is expected to completely eliminate the safety hazards in the use process. And its shape can be cut and changed arbitrarily, which ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/0068Y02E60/10
Inventor 历彪郭姿珠宋威易观贵马永军
Owner BYD CO LTD