All-solid-state secondary battery and method of charging the same

Patent metadata

Field	Value
Publication number	US-2025070262-A1
Application number	US-202418943072-A
Country	US
Kind code	A1
Filing date	Nov 11, 2024
Priority date	Nov 21, 2017
Publication date	Feb 27, 2025
Grant date	—

Abstract

A method of charging an all-solid-state secondary battery, wherein when charging is performed an initial charge capacity of the anode active material layer is exceeded, and a metal layer can be deposited anywhere between the anode current collector and the solid electrolyte, and an initial charge capacity of the cathode active material layer is greater than an initial charge capacity of the anode active material layer. The all-solid-state secondary battery including: a cathode including a cathode active material layer; an anode including an anode current collector, and an anode active material layer on the anode current collector, wherein the anode active material layer includes a plurality of particles comprising amorphous carbon.

First claim

What is claimed is:

1 . An all-solid-state secondary battery comprising:
a cathode comprising a cathode active material layer; an anode comprising
an anode current collector, and
an anode active material layer on the anode current collector; and
a solid electrolyte layer between the cathode and the anode, wherein the anode active material comprises a plurality of particles comprising amorphous carbon, and wherein the anode active material has an average particle diameter of about 4 micrometers or less.

2 . A method of charging an all-solid-state secondary battery, the method comprising:
charging the all-solid-state secondary battery, wherein the all-solid-state secondary battery comprises a cathode, an anode, and a solid electrolyte between the cathode and the anode, wherein the cathode comprises a cathode active material, and the anode comprises an anode current collector and an anode active material on a surface of the anode current collector, wherein when charging is performed such that an initial charge capacity of the anode active material layer is exceeded, a metal layer can be deposited anywhere between the anode current collector and the solid electrolyte, wherein the metal layer comprises at least one of lithium or a lithium alloy, wherein an initial charge capacity of the cathode active material layer is greater than an initial charge capacity of the anode active material layer.

3 . The method of claim 2 , wherein a charge capacity of the all-solid-state secondary battery is about two times to about 100 times greater than the initial charge capacity of the anode active material layer.

4 . The method of claim 2 , wherein the anode active material is in a form of a particle, and wherein the anode active material has an average particle diameter of about 4 micrometers or less.

5 . The method of claim 4 , wherein the particle comprises amorphous carbon, and the anode active material further comprises at least one of a metal or semiconductor.

6 . The method of claim 4 , wherein the particle comprises amorphous carbon, and the anode active material further comprises a particle comprising at least one of a metal or a semiconductor to provide a mixture of particles, and
wherein an amount of the particle comprising the at least one of the metal or the semiconductor is about 8 weight percent to about 60 weight percent, based on a total weight of the mixture of particles.

7 . The method of claim 2 , wherein the maximum charging voltage is about 3 volts to about 5 volts versus Li/Li + .

8 . The method of claim 2 , further comprising a plating layer on the anode current collector, the plating layer comprising an element which is alloyable with lithium,
wherein the plating layer is between the anode current collector and the anode active material layer.

9 . The method of claim 8 , wherein the plating layer comprises at least one of gold, silver, zinc, tin, indium, silicon, aluminum, or bismuth, and has a thickness of about 1 nanometer to about 500 nanometers.

10 . The method of claim 2 , wherein the metal layer is between the anode current collector and the anode active material layer before the all-solid-state secondary battery is charged.

11 . The method of claim 2 , wherein the anode current collector, the anode active material layer, and a region therebetween are Li-free regions at an initial state of or after discharge of the all-solid-state secondary battery.

12 . The method of claim 2 , wherein the ratio of the initial charge capacity of the anode active material layer to the initial charge capacity of the cathode active material layer satisfies a condition of Equation 1:

0.01

<

(

b
/
a

)

<

0
.
5

Equation
⁢

1

wherein a is the initial charge capacity of the cathode active material layer that is determined from a first open circuit voltage to a maximum charging voltage vs. Li/Li + , and

wherein b is the initial charge capacity of the anode active material layer that is determined from a second open circuit voltage to 0.01 Volts vs. Li/Li + .

13 . The method of claim 2 , wherein the metal layer is deposited between the anode current collector and the anode active material layer.

14 . The method of claim 2 , wherein the metal layer is deposited within the anode active material layer.

15 . The method of claim 2 , wherein the metal layer is deposited between the anode active material layer and the anode current collector.

16 . The method of claim 8 , wherein the metal layer is deposited between the plating layer and the anode current collector.

17 . The method of claim 8 , wherein the metal layer is deposited between the plating layer and the anode active material layer.

18 . A method of charging the all-solid-state secondary battery, the method comprising:
charging an all-solid-state secondary battery of claim 1 , wherein the initial charge capacity of the anode active material layer is exceeded during charging.

19 . The method of claim 18 , wherein a ratio of an initial charge capacity of the anode active material layer to an initial charge capacity of the cathode active material layer satisfies Equation 1

0.01
<

(

b
/
a

)

<

0
.
5

Equation
⁢

1

wherein a is the initial charge capacity of the cathode active material layer that is determined from a first open circuit voltage to a maximum charging voltage vs. Li/Li + , and
wherein b is the initial charge capacity of the anode active material layer that is determined from a second open circuit voltage to 0.01 Volts vs. Li/Li + .

20 . The method of claim 18 , wherein the anode current collector, the anode active material layer, and a region therebetween are Li-free regions at an initial state of or after discharge of the all-solid-state secondary battery, and
wherein a metal layer is between the anode current collector and the solid electrolyte after the all-solid-state secondary battery is charged, the metal laye

Assignees

• Samsung Electronics Co Ltd

Inventors

• Suzuki Naoki
• Yashiro Nobuyoshi
• Yamada Takanobu
• Aihara Yuichi

Classifications

• H01M4/133 Primary

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

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M2010/4292

  Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode · CPC title

• H01M4/364

  as mixtures · CPC title