Liquid additive with high lithium ion conductivity and low reactivity with solid electrolyte, and all-solid-state battery capable of operating at room temperature and low pressure including same

Patent metadata

Field	Value
Publication number	US-2025246673-A1
Application number	US-202418769043-A
Country	US
Kind code	A1
Filing date	Jul 10, 2024
Priority date	Jan 29, 2024
Publication date	Jul 31, 2025
Grant date	—

Abstract

A liquid additive for an all-solid-state battery capable of operating under conditions of room temperature and low pressure, and an all-solid-state battery including the same. Specifically, by adding a liquid additive having low reactivity with a solid electrolyte and high lithium ion conductivity to an anode layer, a cathode layer, or a solid electrolyte layer, ionic conductivity and current density robustness of the all-solid-state battery can be improved under conditions of room temperature and low pressure.

First claim

What is claimed is:

1 . A liquid additive for a solid electrolyte, the liquid additive comprising:
a lithium salt; and a solvent comprising an orthoester compound.

2 . The liquid additive of claim 1 wherein the orthoester compound has a structure of (RC(OR′) 3 ) where R is H or optionally substituted C1-12 alkyl; and each R′ is the same or different optionally substituted C1-12 alkyl.

3 . The liquid additive of claim 1 wherein the solvent can solvate the lithium salt and is compatible with a solid electrolyte.

4 . The liquid additive of claim 1 , wherein the solvent comprises one selected from the group consisting of trimethyl orthoformate (TMOF), triethyl orthoformate (TEOF), tripropyl orthoformate (TPOF), tributyl orthoformate (TBOF), diethyl phenyl orthoformate (DPOF), and combinations thereof.

5 . The liquid additive of claim 1 , wherein the solvent comprises trimethyl orthoformate (TMOF).

6 . The liquid additive of claim 1 , wherein a dipole moment of the solvent is less than 2.00 D.

7 . The liquid additive of claim 1 , wherein the lithium salt comprises one selected from the group consisting of LiCl, LiBr, LiI, LiBF 4 , LiClO 4 , LiB 10 Cl 10 , LiAlCl 4 , LiAlO 4 , LiPF 6 , LiCF 3 SO 3 , LiCH 3 CO 2 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiCH 3 SO 3 , LiN(SO 2 F) 2 (Lithium bis(fluorosulfonyl)imide, LiFSI), LiN(SO 2 CF 2 CF 3 ) 2 (lithium bis(pentafluoroethanesulfonyl)imide, LiBETI), LiN(SO 2 CF 3 ) 2 (lithium bis(trifluoromethane sulfonyl)imide, LiTFSI), and combinations thereof.

8 . The liquid additive of claim 1 , wherein a concentration of the lithium salt is 0.1 M to 10 M.

9 . A solid electrolyte layer, comprising:
a solid electrolyte; and the liquid additive of claim 1 .

10 . The solid electrolyte layer of claim 9 , wherein the solid electrolyte comprises a sulfide-based solid electrolyte.

11 . The solid electrolyte layer of claim 9 , wherein the solid electrolyte layer comprises 0.1 wt % to 20 wt % of the liquid additive.

12 . A composite cathode layer, comprising:
a cathode active material; a solid electrolyte; and the liquid additive of claim 1 .

13 . The composite cathode layer of claim 12 , wherein the solid electrolyte comprises a sulfide-based solid electrolyte.

14 . The composite cathode layer of claim 13 , wherein the solid electrolyte layer comprises 0.1 wt % to 20 wt % of the liquid additive.

15 . A composite anode layer, comprising:
an anode active material; a solid electrolyte; and the liquid additive of claim 1 .

16 . The composite anode layer of claim 15 , wherein the solid electrolyte comprises a sulfide-based solid electrolyte.

17 . An all-solid-state battery, comprising:
an anode comprising an anode current collector and an anode layer; a cathode comprising a cathode current collector and a cathode layer; and the solid electrolyte layer of claim 9 disposed between the anode and the cathode.

18 . The all-solid-state battery of claim 17 , further comprising a restraining portion disposed outside the anode, the solid electrolyte layer, and the cathode and configured to press the anode, the solid electrolyte layer, and the cathode in a stacking direction, wherein clamping pressure applied by the restraining portion to the anode, the solid electrolyte layer, and the cathode is 0.1 MPa to 10 MPa.

19 . The all-solid-state battery of claim 17 , wherein the all-solid-state battery is configured to operate under conditions of room temperature.

20 . A vehicle comprising the all-solid-state battery of claim 17 .

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Seoul Nat Univ R&Db Foundation

Inventors

• Kim Ji Young
• Son Sam Ick
• Bae Ki Yoon
• Choi Jang Wook
• Lee Noh Joon
• Oh Ji Hoon
• Sohn Ye Eun

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• B60L50/60

  using power supplied by batteries (in combination with fuel cells B60L50/75) · CPC title

• H01M4/624

  Electric conductive fillers · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title