Solid Electrolyte Battery and Battery Module and Battery Pack Comprising Same

Patent metadata

Field	Value
Publication number	US-2020287245-A1
Application number	US-201916648882-A
Country	US
Kind code	A1
Filing date	Apr 10, 2019
Priority date	Apr 26, 2018
Publication date	Sep 10, 2020
Grant date	—

Abstract

The present disclosure relates to a solid electrolyte battery including a negative electrode including: a negative electrode current collector; a first negative electrode active material layer formed on at least one surface of the negative electrode current collector and including a first negative electrode active material, a first solid electrolyte and a first electrolyte salt; and a second negative electrode active material layer formed on the first negative electrode active material layer and including a second negative electrode active material, a second solid electrolyte, a second electrolyte salt and a plasticizer having a melting point of 30-130° C., the solid electrolyte battery is activated at a temperature between the melting point of the plasticizer and 130° C., and a solid electrolyte interface (SEI) layer is formed on the surface of the second negative electrode active material.

First claim

1 . A solid electrolyte battery comprising a positive electrode, a negative electrode and a separator interposed between the positive electrode and the negative electrode,
wherein the negative electrode comprises: a negative electrode current collector; a first negative electrode active material layer formed on at least one surface of the negative electrode current collector and comprising a first negative electrode active material, a first solid electrolyte and a first electrolyte salt; and a second negative electrode active material layer formed on the first negative electrode active material layer and comprising a second negative electrode active material, a second solid electrolyte, a second electrolyte salt and a plasticizer having a melting point of 30-130° C., the solid electrolyte battery is activated at a temperature between the melting point of the plasticizer and 130° C., and a solid electrolyte interface (SEI) layer is formed on the surface of the second negative electrode active material during an initial charge of the solid electrolyte battery.

2 . The solid electrolyte battery according to claim 1 , wherein the plasticizer has a melting point of 35-65° C.

3 . The solid electrolyte battery according to claim 1 , wherein the plasticizer is ethylene carbonate (EC), polyethylene glycol (PEG) having a weight average molecular weight of 1,000 or more, succinonitrile (SN), cyclic phosphate (CP) or at least two of them.

4 . The solid electrolyte battery according to claim 1 , wherein the plasticizer is used in an amount of 0.1-30 wt % based on the total weight of the second negative electrode active material layer.

5 . The solid electrolyte battery according to claim 1 , wherein each of the first negative electrode active material layer and the second negative electrode active material layer further comprises a conductive material and a binder.

6 . The solid electrolyte battery according to claim 1 , wherein the weight ratio of the first negative electrode active material layer to the second negative electrode active material layer is 1:99-99:1.

7 . The solid electrolyte battery according to claim 1 , wherein the plasticizer is present in a liquid state after the solid electrolyte battery is activated.

8 . The solid electrolyte battery according to claim 1 , wherein each of the first negative electrode active material and the second negative electrode active material is a graphite-based negative electrode active material.

9 . The solid electrolyte battery according to claim 1 , wherein voids in the second negative electrode active material layer are filled with the plasticizer when in a liquid-state.

10 . The solid electrolyte battery according to claim 1 , wherein the separator comprises a solid electrolyte membrane.

11 . The solid electrolyte battery according to claim 10 , wherein the solid electrolyte membrane comprises a polymer solid electrolyte, an oxide-based solid electrolyte, a sulfide-based solid electrolyte, or at least two of them.

12 . The solid electrolyte battery according to claim 8 , wherein the graphite-based negative electrode active material comprises natural graphite, artificial graphite, mesocarbon microbeads (MCMB), carbon fibers, carbon black, soft carbon, hard carbon, or at least two of them.

13 . A battery module comprising the solid electrolyte battery as defined in claim 1 , as a unit cell.

14 . A battery pack comprising the battery module as defined in claim 13 .

15 . The solid electrolyte battery according to claim 1 , wherein the first solid electrolyte and the second solid electrolyte are each a polymer solid electrolyte formed by adding a polymer resin to a solvated electrolyte salt, or a polymer gel electrolyte formed by incorporating an organic electrolyte containing an organic solvent and an electrolyte salt, an ionic liquid, monomer or oligomer to a polymer resin.

Assignees

• Lg Chemical Ltd

Inventors

• Ryu Ji-Hoon
• Lee Jung-Pil
• Kang Sung-Joong
• Kim Eun-Bee
• Kim Ji-Young
• Lee Suk-Woo
• Lee Jae-Hyun

Classifications

• H01M10/0585 Primary

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0565

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

• H01M10/0562 Primary

  Solid materials · CPC title