Solid electrolyte composite and all-solid-state battery electrode comprising same

Patent metadata

Field	Value
Publication number	US-2022216512-A1
Application number	US-202017604464-A
Country	US
Kind code	A1
Filing date	Apr 20, 2020
Priority date	Apr 19, 2019
Publication date	Jul 7, 2022
Grant date	—

Abstract

A solid electrolyte composite according to the present disclosure comprises a solid electrolyte material and a passivation film covering the surface of the solid electrolyte material. For example, the composite has a core-shell structure comprising a particulate solid electrolyte material and a passivation film covering the surface of the solid electrolyte.

First claim

1 . A solid electrolyte composite comprising:
a particulate solid electrolyte material; and a passivation film covering all or at least part of the solid electrolyte material, wherein the passivation film has ionic conductivity of 1×10 −5 s/cm or above and electronic conductivity of 1×10 −9 s/cm or less.

2 . The solid electrolyte composite according to claim 1 , wherein the passivation film is 10 nm to 1 μm in thickness.

3 . The solid electrolyte composite according to claim 1 , wherein the passivation film comprises a polyvinylene carbonate-based polymer.

4 . The solid electrolyte composite according to claim 3 , wherein the polyvinylene carbonate-based polymer comprises vinylene carbonate as a polymerizable unit.

5 . The solid electrolyte composite according to claim 4 , wherein the polyvinylene carbonate-based polymer comprises vinylene carbonate as a polymerizable unit, and further comprises a second polymerizable unit that can be polymerized with the vinylene carbonate, and
the second polymerizable unit is at least one selected from the group consisting of acrylonitrile, methyl methacrylate, styrene, vinyl pyrrolidone, vinyl acetate, vinyl alcohol, and vinyl chloride.

6 . The solid electrolyte composite according to claim 1 , wherein the solid electrolyte material comprises at least one selected from the group consisting of a polymer-based solid electrolyte, an oxide-based solid electrolyte and a sulfide-based solid electrolyte.

7 . The solid electrolyte composite according to claim 6 , wherein the oxide-based solid electrolyte contains oxygen (O) and has ionic conductivity of a metal belonging to Group I or Group II of the periodic table, and
the oxide-based solid electrolyte comprises at least one selected from the group consisting of a LLTO-based compound, Li 6 La 2 CaTa 2 O 12 , Li 6 La 2 ANb 2 O 12 wherein A is Ca or Sr, Li 2 Nd 3 TeSbO 12 , Li 3 BO 2.5 N 0.5 , Li 9 SiAlO 8 , a LAGP-based compound, a LATP-based compound, Li 1+x Ti 2−x Al x Si y (PO 4 ) 3−y wherein 0≤x≤1, and 0≤y≤1, LiAl x Zr 2−x (PO 4 ) 3 wherein 0≤x≤1, and 0≤y≤1, LiTi x Zr 2−x (PO 4 ) 3 wherein 0≤x≤1, and 0≤y≤1, a LISICON-based compound, a LIPON-based compound, a perovskite-based compound, a NASICON-based compound and a LLZO-based compound.

8 . An electrode for an all-solid-state battery comprising the solid electrolyte composite according to claim 1 , an electrode active material and a conductive material.

9 . An all-solid-state battery comprising the solid electrolyte composite according to claim 1 .

10 . The all-solid-state battery according to claim 9 , wherein the all-solid-state battery comprises a negative electrode, a positive electrode and a solid electrolyte membrane interposed between the negative electrode and the positive electrode, and
the negative electrode or the positive electrode or both the negative and the positive electrode comprise the solid electrolyte composite.

11 . A method for manufacturing the solid electrolyte composite according to claim 1 , the method comprising:
(S1) coating the passivation layer composition on a surface of the particulate solid electrolyte material; and (S2) providing the coated solid electrolyte material to polymerization reaction, wherein the passivation layer composition comprises vinylene carbonate, a lithium salt, a polymerization initiator and a non-aqueous organic solvent.

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Eun-Bee
• Ryu Ji-Hoon
• Lee Suk-Woo
• Lee Jung-Pil

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/0407

  by coating on an electrolyte layer · CPC title

• H01M10/0565 Primary

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• H01M4/624

  Electric conductive fillers · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title