All-solid lithium secondary battery and preparation method thereof

Patent metadata

Field	Value
Publication number	US-2023420641-A1
Application number	US-202218037488-A
Country	US
Kind code	A1
Filing date	May 27, 2022
Priority date	May 28, 2021
Publication date	Dec 28, 2023
Grant date	—

Abstract

The present disclosure relates to an all-solid lithium secondary battery and a preparation method thereof, wherein the all-solid lithium secondary battery includes a positive electrode active material layer, a negative electrode active material layer, and a solid electrolyte layer disposed between the positive electrode active material layer and the negative electrode active material layer, wherein the negative electrode active material layer includes a carbon structure and silver nanoparticles, the carbon structure includes at least one hollow-type particle, and the hollow-type particle includes a hollow and a carbonaceous shell surrounding the hollow.

First claim

1 . An all-solid lithium secondary battery, comprising:
a positive electrode active material layer; a negative electrode active material layer; and a solid electrolyte layer disposed between the positive electrode active material layer and the negative electrode active material layer, wherein the negative electrode active material layer comprises a carbon structure and silver nanoparticles, wherein the carbon structure comprises at least one hollow-type particle, and the hollow-type particle comprises a hollow and a carbonaceous shell surrounding the hollow.

2 . The all-solid lithium secondary battery of claim 1 , wherein the silver nanoparticles are disposed on a surface of the carbon structure.

3 . The all-solid lithium secondary battery of claim 1 , wherein the carbonaceous shell has a thickness of 1 nm to 15 nm.

4 . The all-solid lithium secondary battery of claim 1 , wherein the carbon structure has a specific surface area of 10 m 2 /g to 300 m 2 /g.

5 . The all-solid lithium secondary battery of claim 1 , wherein the hollow-type particle has an average particle diameter of 5 nm to 100 nm.

6 . The all-solid lithium secondary battery of claim 1 , wherein, in Raman spectrum measurement of the carbon structure,
the carbon structure has an I D /I G of 0.1 to 1.5.

7 . The all-solid lithium secondary battery of claim 1 , wherein the carbon structure has a secondary particle shape in which a plurality of hollow-type particles are bonded to each other.

8 . The all-solid lithium secondary battery of claim 1 , wherein the carbon structure is included in an amount of 50 wt % to 98 wt % in the negative electrode active material layer.

9 . The all-solid lithium secondary battery of claim 1 , wherein the silver nanoparticles have an average particle diameter of 1 nm to 100 nm.

10 . The all-solid lithium secondary battery of claim 1 , wherein, in the negative electrode active material layer,
the silver nanoparticles are included in an amount of 1 wt % to 40 wt % based on a total weight of the carbon structure and the silver nanoparticles.

11 . The all-solid lithium secondary battery of claim 1 , wherein a weight ratio of the carbon structure to the silver nanoparticles is in a range of 99:1 to 60:40.

12 . The all-solid lithium secondary battery of claim 1 , wherein the negative electrode active material layer further comprises a negative electrode binder.

13 . The all-solid lithium secondary battery of claim 1 , wherein the negative electrode active material layer has a thickness of 1 μm to 100 μm.

14 . The all-solid lithium secondary battery of claim 1 , further comprising:
a negative electrode collector; and a metal layer disposed between the negative electrode active material layer and the negative electrode collector in a charged state, wherein the metal layer comprises lithium.

15 . A method of preparing the all-solid lithium secondary battery of claim 1 , the method comprising:
a first step of forming a dry mixed powder including the carbon structure and the silver nanoparticles disposed on the carbon structure by reducing silver ions in a mixture of the silver ions and the carbon structure; and a second step of forming the negative electrode active material layer on a negative electrode collector through a negative electrode mixture including the dry mixed powder.

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Tae Gon
• Lee Dong Chan
• Lee Jeong Beom
• Kim Sul Cham
• Kwon Hye Jin
• Hah Hoe Jin
• Kim Ki Tae
• Kim So Hee
• Kim Jeong Gil
• Kim Myeong Soo

Classifications

• H01M4/134 Primary

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/38

  of elements or alloys · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/133 Primary

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/1393

  of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title