Secondary battery and manufacturing method for the same

Patent metadata

Field	Value
Publication number	US-2024186509-A1
Application number	US-202318379215-A
Country	US
Kind code	A1
Filing date	Oct 12, 2023
Priority date	Oct 20, 2022
Publication date	Jun 6, 2024
Grant date	—

Abstract

A secondary battery comprising a metallic lithium negative electrode and having a coulombic efficiency. The secondary battery of the present disclosure comprises a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer, wherein the negative electrode active material layer comprises a first substance and a second substance, wherein the first substance is at least one of an alloy of Li and an element X and a compound of Li and the element X; the second substance is at least one of a simple substance of a metal element M, an alloy of Li and the metal element M, and a compound of Li and the metal element M; and a formation energy ELiX of the first substance is lower than a formation energy EMX of the compound of the metal element M and the element X.

First claim

1 . A secondary battery, comprising a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer, wherein
the negative electrode active material layer comprises a first substance and a second substance, wherein
the first substance is at least one of an alloy of Li and an element X and a compound of Li and the element X;
the second substance is at least one of a simple substance of a metal element M, an alloy of Li and the metal element M, and a compound of Li and the metal element M; and
a formation energy E LiX of the first substance is lower than a formation energy E MX of a compound of the metal element M and the element X.

2 . The secondary battery according to claim 1 , wherein
the negative electrode active material layer comprises the first substance formed into a film, wherein
the first substance formed into the film has a thickness of 10 nm or more and 50 μm or less.

3 . A secondary battery, comprising a positive electrode active material layer, a solid electrolyte layer, a negative electrode current collector, and metallic lithium deposited between the solid electrolyte layer and the negative electrode current collector by charging, wherein
a compound of a metal element M and an element X is present between the solid electrolyte layer and the negative electrode current collector; and a formation energy E MX of the compound of the metal element M and the element X is higher than a formation energy E LiX of a compound of Li and the element X.

4 . The secondary battery according to claim 3 ,
which is configured so that the compound of the metal element M and the element X decomposes during charging to generate a compound of Li and the element X on a surface of the negative electrode current collector.

5 . The secondary battery according to claim 1 , wherein
the metal element M and the element X satisfy the following relations (1) and (2):
(1) a formation energy E MX of a compound of the metal element M and the element X is lower than a formation energy E LiM of a compound of Li and the metal element M; and
(2) a formation energy E LiX of a compound of Li and the element X is lower than a formation energy E MX of the compound of the metal element M and the element X.

6 . The secondary battery according to claim 1 , wherein
the metal element M is Mg.

7 . The secondary battery according to claim 6 , wherein
the element X is at least one of Bi, Sb, In, Sn, H, I, Ga, Te, Hg, Cd, Si, B, As, Zn, Ge, Br, P, and Se.

8 . The secondary battery according to claim 1 , wherein
the element X is at least one of H, B, and P.

9 . The secondary battery according to claim 1 , wherein
a difference between the formation energy E MX and the formation energy E LiX is 0.027 eV/atom or more.

10 . The secondary battery according to claim 3 , wherein
the metal element M and the element X satisfy the following relations (1) and (2):
(1) a formation energy E MX of a compound of the metal element M and the element X is lower than a formation energy E LiM of a compound of Li and the metal element M; and
(2) a formation energy E LiX of a compound of Li and the element X is lower than a formation energy E MX of the compound of the metal element M and the element X.

11 . The secondary battery according to claim 3 , wherein
the metal element M is Mg.

12 . The secondary battery according to claim 11 , wherein
the element X is at least one of Bi, Sb, In, Sn, H, I, Ga, Te, Hg, Cd, Si, B, As, Zn, Ge, Br, P, and Se.

13 . The secondary battery according to claim 3 , wherein
the element X is at least one of H, B, and P.

14 . The secondary battery according to claim 3 , wherein
a difference between the formation energy E MX and the formation energy E LiX is 0.027 eV/atom or more.

15 . A manufacturing method for a secondary battery, the method comprising:
obtaining a laminated body comprising a positive electrode active material layer, a solid electrolyte layer, a negative electrode current collector, and a compound of a metal element M and an element X disposed between the solid electrolyte layer and the negative electrode current collector; and charging the laminated body to supply lithium ions between the solid electrolyte layer and the negative electrode current collector to cause a conversion reaction of the compound of the metal element M and the element X to generate a first substance and a second substance, wherein
the first substance is at least one of an alloy of Li and the element X and a compound of Li and the element X; and
the second substance is at least one of a simple substance of a metal element M, an alloy of Li and the metal element M, and a compound of Li and the metal element M.

Assignees

• Toyota Motor Co Ltd

Inventors

• Li Ximeng
• Yamasaki Hisatsugu
• Kon Makio
• Matsunaga Tomoya

Classifications

• H01M4/0438

  by electrochemical processing (electroless electrochemical plating C23C18/54) · CPC title

• H01M10/052

  Li-accumulators · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2300/0068

  inorganic · CPC title

• H01M2004/027

  Negative electrodes · CPC title