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Solid electrolyte, electrochemical cell including solid electrolyte, and method of preparing solid electrolyte

A technology of solid electrolytes and compounds, applied in solid electrolytes, chemical instruments and methods, non-aqueous electrolyte batteries, etc., can solve problems such as weak stability

Pending Publication Date: 2021-05-11
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfide-based solid electrolytes have poor stability against oxidation at high voltages, and thus there is still a need for improved electrolytes

Method used

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  • Solid electrolyte, electrochemical cell including solid electrolyte, and method of preparing solid electrolyte
  • Solid electrolyte, electrochemical cell including solid electrolyte, and method of preparing solid electrolyte
  • Solid electrolyte, electrochemical cell including solid electrolyte, and method of preparing solid electrolyte

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Embodiment approach

[0182] According to an embodiment, a method of preparing a solid electrolyte includes: mixing a sulfur (S) precursor, a phosphorus (P) precursor, an X precursor, and a nitrogen (N) precursor to prepare a precursor mixture; and mixing the precursor mixture to A solid electrolyte precursor is prepared and then heat-treated at a temperature of about 300° C. or higher. X of the X precursor may be chlorine (Cl), bromine (Br), fluorine (F), iodine (I), pseudohalogen, or a combination thereof.

[0183] At least one of the sulfur precursor, phosphorus precursor, X precursor, or nitrogen precursor may include lithium.

[0184] Examples of sulfur precursors may include Li 2 S, and examples of phosphorus precursors may include P 2 S 5 , red phosphorus, white phosphorus, phosphorus powder, (NH 4 ) 2 HPO 4 , (NH 4 )H 2 PO 4 、Na 2 HPO 4 or Na 3 PO 4 .

[0185] Examples of nitrogen precursors may include Li 3 N or N 2 S 3 .

[0186] Examples of the X precursor may include l...

Embodiment 1

[0215] Will Li 2 S, P 2 S 5 , LiCl and Li 3 N mixed to obtain a precursor mixture, each measured in stoichiometric ratio Li in the preparation of the precursor mixture 2 S, P 2 S 5 , LiCl and Li 3 The amount of N to obtain Li 6.125 P.S.4.875 N 0.125 Cl, and the resultant was mixed by mechanical milling treatment for 20 hours by using a high energy mill (Pulnerisette 7). The mechanical grinding treatment was performed at 25° C. for 20 hours at a rotation rate of 380 rpm in an argon atmosphere to obtain a powder material. 300 mg of the powder material obtained by the mechanical grinding treatment was heat-treated at 500° C. for 12 hours in a vacuum atmosphere to obtain a solid electrolyte. In the solid electrolyte (Li 6.125 P.S. 4.875 N 0.125 In Cl), the amount of nitrogen is 2.5 mol%, based on the total amount of sulfur and nitrogen.

Embodiment 2

[0217] A solid electrolyte was obtained in the same manner as in Example 1, except as follows: Li was selected stoichiometrically 2 S, P 2 S 5 , LiCl and Li 3 The amount of N to obtain Li 6.25 P.S. 4.75 N 0.25 Cl and heat treatment at 500°C for 12 hours. In the solid electrolyte (Li 6.25 P.S. 4.75 N 0.25 In Cl), the amount of nitrogen is 5 mol%, based on the total amount of sulfur and nitrogen.

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Abstract

The present invention relates to a solid electrolyte, an electrochemical cell including solid electrolyte, and a method of preparing the solid electrolyte. The solid electrolyte includes a compound represented by Formula 1: Formula 1 (Li1-aMa)7-d+xPS6-d-x+kNxXdwherein, in Formula 1, M is Na, K, Ca, Fe, Mg, Ag, Cu, Zr, Zn, or a combination thereof; X is Cl, Br, F, I, a pseudohalogen, or a combination thereof; furthermore 0<x<1, 0<=a<1, 0<d<=1.8 and 0<=k<1, and wherein the compound has an argyrodite crystal structure. Formula1 (Li1-aMa)7-d+xPS6-d-x+kNxXd.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2019-0141899 filed on November 7, 2019 and Korean Patent Application No. 10-2020-0096951 filed on August 3, 2020 at the Korean Intellectual Property Office and interests, and all interests arising therefrom, the contents of which are incorporated herein by reference in their entirety. technical field [0003] The present disclosure relates to solid electrolytes, electrochemical cells (cells) including the solid electrolytes, and methods of making the solid electrolytes. Background technique [0004] Recently, development of batteries having high specific energy and improved safety has been actively performed according to industrial demands. For example, lithium ion batteries have been put into practical use in the automotive field and in information-related equipment and communication equipment. Safety is of particular importance in the automotive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/052C01D15/00C01B25/08
CPCH01M10/0562H01M10/052C01D15/00C01B25/08H01M2300/0068C01B25/14H01M10/0525H01M2004/027H01M2004/028H01M4/62H01M4/624H01M4/133H01M4/134H01M4/366H01M4/382H01M4/405H01M4/131Y02E60/10H01M2300/0071
Inventor 金素妍金泫锡李锡守
Owner SAMSUNG SDI CO LTD
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