Phase-transition solid electrolyte material and all solid secondary battery including same

Patent metadata

Field	Value
Publication number	US-2024291029-A1
Application number	US-202418647292-A
Country	US
Kind code	A1
Filing date	Apr 26, 2024
Priority date	Nov 16, 2018
Publication date	Aug 29, 2024
Grant date	—

Abstract

An all-solid secondary battery includes: a cathode layer including a cathode active material; an anode layer; and a solid electrolyte layer disposed between the cathode layer and the anode layer, wherein at least one of the cathode layer, the anode layer, or the solid electrolyte layer includes a phase-transition solid electrolyte material, wherein upon heating, the phase-transition solid electrolyte material undergoes a phase transition from a first phase to a second phase, and the second phase has an ionic conductivity less than the ionic conductivity of the first phase.

First claim

What is claimed is:

1 . A solid electrolyte material comprising: at least one sulfide material represented by Formula (4) or Formula (5)

wherein, in Formula (4) and Formula (5), d and e are each independently

0
.
1

≦
d
≦
0.7

,
and

0
≦
e
≦
1

,

wherein upon heating, the solid electrolyte material undergoes a phase transition, wherein a phase-transition temperature of the solid electrolyte material is in a temperature range of about 200° C. or greater to about 300° C. or less.

2 . An all-solid secondary battery comprising:
a cathode layer comprising a cathode active material; an anode layer; and a solid electrolyte layer between the cathode layer and the anode layer, wherein at least one of the cathode layer, the anode layer, or the solid electrolyte layer comprises a phase-transition solid electrolyte material, wherein upon heating, the phase-transition solid electrolyte material undergoes a phase transition from a first phase to a second phase, and the second phase has an ionic conductivity that is less than an ionic conductivity of the first phase.

3 . The all-solid secondary battery of claim 2 , wherein
the phase-transition of the phase-transition solid electrolyte material occurs at a temperature equal to or less than a decomposition temperature of the cathode active material.

4 . The all-solid secondary battery of claim 2 , wherein
the phase-transition of the phase-transition solid electrolyte material occurs in a temperature range of about 200° C. or greater to about 300° C. or less.

5 . The all-solid secondary battery of claim 2 , wherein
the phase-transition solid electrolyte material comprises Li 2 S and P 2 S 5 .

6 . The all-solid secondary battery of claim 2 , wherein
the phase-transition solid electrolyte material comprises at least one sulfide material represented by Formula (6):

wherein, in Formula (6), 0.7<a<0.9.

7 . The all-solid secondary battery of claim 6 , wherein,
in Formula (6), 0.72≤a≤0.8.

8 . The all-solid secondary battery of claim 2 , wherein
the phase-transition solid electrolyte material comprises at least one sulfide material represented by Formula (1):

wherein, in Formula (1),

0
.
0

⁢
1

≦
b
≦

0
.7

,

0.6
≦
c
≦

0
.
9

,

and X is at least one of Cl, Br, or I.

9 . The all-solid secondary battery of claim 8 , wherein,
in Formula (1),

0
.
2

≦
b
≦
0.67

,
and

0.7
≦
c
≦

0
.
8
.

10 . The all-solid secondary battery of claim 2 , wherein
the phase-transition solid electrolyte material comprises at least one sulfide represented by Formula (2) or Formula (3):

wherein, in Formula (2) and Formula (3), d and e are each independently

0
.
1

≦
d
≦
0.7

,
and

0
≦
e
≦

1
.

11 . The all-solid secondary battery of claim 2 , wherein
the cathode active material comprises
a layered oxide material comprising Li and at least one of Ni, Co, Mn, or Al; and
at least one of elemental sulfur or a sulfur compound.

12 . The all-solid secondary battery of claim 2 , wherein
the cathode active material comprises a compound represented by LiNi x Co y Al z O 2 or LiNi x′ Co y′ Mn z′ O 2 , wherein 0<x<1, 0<y<1, 0<z<1, x+y+z=1, 0<x′<1, 0<y′<1, 0<z′<1, and x′+y′+z′=1.

13 . The all-solid secondary battery of claim 2 , wherein
the anode layer comprises an anode active material, and the anode active material comprises a material which forms an alloy or a compound with lithium.

14 . The all-solid secondary battery of claim 13 , wherein
the anode active material is lithium metal.

15 . The all-solid secondary battery of claim 2 , wherein,
a charge capacity ratio between the cathode layer and the anode layer satisfies the relationship represented by Formula (1):

0
.
0

⁢
0
⁢
2

<

b
/
a

<

0
.
5

(
I
)

wherein, in Formula (I), a is a charge capacity of the cathode layer, and b is a charge capacity of the anode layer.

16 . The all-solid secondary battery of claim 2 , wherein
the solid electrolyte layer comprises a first s

Assignees

• Samsung Electronics Co Ltd

Inventors

• Ito Seitaro
• Tsujimura Tomoyuki
• Aihara Yuichi

Classifications

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• H01M2300/0068

  inorganic · CPC title

• C01G53/42

  containing alkali metals, e.g. LiNiO2 · CPC title

• C01G53/50

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title