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Solid electrolyte, preparation method thereof, protected positive electrode comprising same, electrochemical cell and electrochemical device

A solid electrolyte, compound technology, applied in the direction of electrolyte immobilization/gelation, electrolyte, battery electrode, etc., can solve problems such as toxic sulfide gas

Pending Publication Date: 2021-12-07
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, solid secondary batteries employing sulfide-based solid electrolytes can generate toxic sulfide gas when exposed to air

Method used

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  • Solid electrolyte, preparation method thereof, protected positive electrode comprising same, electrochemical cell and electrochemical device
  • Solid electrolyte, preparation method thereof, protected positive electrode comprising same, electrochemical cell and electrochemical device
  • Solid electrolyte, preparation method thereof, protected positive electrode comprising same, electrochemical cell and electrochemical device

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preparation example Construction

[0177] The solid electrolyte preparation method may further include, after the mechanical grinding, the step of standing. Through this standing step, the temperature of the product from said mechanical grinding can be cooled down. Through this standing step, for example, the temperature of the product from said mechanical grinding can be controlled to 80°C or lower, eg, about 20°C to 80°C.

[0178] For the solid electrolyte according to one or more embodiments, a separate heat treatment process may be omitted, unlike other methods of preparing a solid electrolyte. A separate heat treatment is not performed after the mechanical grinding of the mixture for forming the solid electrolyte according to one or more embodiments. If the heat treatment process is further performed, it may be difficult to obtain the solid electrolyte according to one or more embodiments.

[0179] By mechanical grinding of said mixture as described above, it may be possible to control the particle size ...

Embodiment 1

[0251] LiCl (water content: 3.43% by weight) and GaF 3 Mix at 2:1 molar ratio to obtain a mixture, and subject the mixture to high energy milling for 10 minutes by ball milling at 700 rpm using Pulverisette 7 Premium line equipment. After the high energy milling, the resulting product was cooled down by standing for 5 minutes (one cycle). This cycle of high-energy milling and standing steps was repeated for a total of 72 cycles to obtain a compound in clay form having a composition as in Table 1 .

Embodiment 2 and 3

[0253] A compound in the form of clay having a composition as in Table 1 was obtained according to the same method as in Example 1, except as follows: LiCl was added to GaF 3 The mixing molar ratios were changed to 3:1 and 4:1, respectively.

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Abstract

The invention relates to a solid electrolyte, a preparation method thereof, a protected positive electrode comprising same, an electrochemical cell and an electrochemical device. A solid electrolyte includes a compound represented by Formula 1 or 3, the compound having a glass transition temperature of -30 DEG C or less, and a glass or glass-ceramic structure, AQX-Ga1-zMz1(F1-kClk)3-3zZ3z1 Formula 1, wherein, in Formula 1,Q is Li or a combination of Li and Na, K, or a combination thereof,M is a trivalent cation, or a combination thereof, X is a halogen other than F, pseudohalogen, OH, or a combination thereof, Z is a monovalent anion, or a combination thereof, 1<A<5, 0<=z<=1, 0<=z1<=1, and 0<=k<1, AQX-aMz1Z3z1-bGa1-z(F1-kClk)3-3z Formula 3, wherein, in Formula 3, Q is Li or a combination of Li and Na, K, or a combination thereof; M is a trivalent cation, or a combination thereof, X is a halogen other than F, pseudohalogen, OH, or a combination thereof, Z is a monovalent anion, or a combination thereof, 0<a<=1, 0<b<=1, 0<a+b, a+b=4-A, 1<A<5, 0<=z<1, 0<=z1,=1, and 0<=k<1.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2020-0066524 filed on June 2, 2020 and Korean Patent Application No. 10-2021-0070877 filed on June 1, 2021 at the Korean Intellectual Property Office and interest, and all interests arising therefrom, the contents of which are hereby incorporated by reference in their entirety. technical field [0003] The present disclosure relates to solid electrolytes, methods of making them, and electrochemical devices including them. Background technique [0004] A solid secondary battery includes a positive electrode, a solid electrolyte, and a negative electrode. For solid electrolytes among these components, high ion conductivity is desired. [0005] The solid electrolyte includes a sulfide-based solid electrolyte and an oxide-based solid electrolyte. In order to use these solid electrolytes in solid secondary batteries, it is desirable to reduce grain bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0562H01M10/4235H01M2300/0085H01M2300/008H01M2008/128H01M4/134H01M2004/027H01M2300/0094H01M2300/0071H01M2300/0045C01P2002/72C01P2004/03C01P2002/85C01P2002/88C01G15/006C01P2004/61Y02E60/10Y02E60/50
Inventor 郑成均权赫祚尹钾仁金柱植
Owner SAMSUNG ELECTRONICS CO LTD
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