Nonaqueous lithium storage element

Patent metadata

Field	Value
Publication number	US-10403447-B2
Application number	US-201716070327-A
Country	US
Kind code	B2
Filing date	Jan 20, 2017
Priority date	Jan 22, 2016
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

The disclosure relates to a lithium storage element containing a positive electrode that contains a lithium compound other than an active material, a negative electrode, a separator, and a nonaqueous electrolytic solution containing lithium ions, for which an active material is applied on both surfaces of a nonporous positive electrode power collector, and a negative electrode active material capable of storing and releasing lithium ions is applied on both surfaces of a nonporous negative electrode power collector.

First claim

The invention claimed is:

1. A nonaqueous lithium power storage element comprising:
at least one positive electrode that contains a lithium compound other than an active material;
at least one negative electrode;
a separator; and
a lithium ion-containing nonaqueous electrolytic solution; wherein the active material is coated onto both sides of a nonporous positive electrode power collector of the positive electrode,
a negative electrode active material capable of intercalating and releasing lithium ions is coated onto both sides of a nonporous negative electrode power collector of the negative electrode,
C x1 /C y1 is 0.85 to 1.15, where C x1 (g/m 2 ) is the basis weight of the positive electrode active material layer on one side (C x side) of the positive electrode, and C y1 (g/m 2 ) is the basis weight of the positive electrode active material layer on the other side (C y side),
A x1 /A y1 is 0.85 to 1.15, and (A x1 +C x1 )/(A y1 +C y1 ) is 0.80 to 1.20, where A y1 (g/m 2 ) is the basis weight of the negative electrode active material layer of one side (A y side) of the negative electrode that is facing the C y side, and A x1 (g/m 2 ) is the basis weight of the negative electrode active material layer on the other side (A x side),
C x2 and C y2 are each 0.1 to 18, and C y2 /C x2 and C x2 /C y2 are each 0.60 to 1.70, where C x2 (g/m 2 ) is an amount of the lithium compound per area on the C x side and C y2 (g/m 2 ) is an amount of the lithium compound per area on the C y side,
the lithium compound is lithium carbonate, and
S x and S y are each 1% to 40% and S x /S y is 0.5 to 1.5, where S x (%) is an area ratio (%) of carbonate ion mapping of the C x side in an image obtained by microscopic Raman spectroscopy of the C x side, and S y (%) is an area ratio (%) of carbonate ion mapping of the C y side in an image obtained by microscopic Raman spectroscopy of the Cy side,
the nonaqueous lithium power storage element contains an electrode laminated body or wound electrode comprising the at least one positive electrode and the at least one negative electrode either laminated or wound via the separator,
the electrode laminated body or wound electrode contains the negative electrode as at least one outermost layer having a negative electrode active material layer A w side that does not face the positive electrode, and
A w1 /A z1 is 0.01 to 0.45, where A w1 (mol/m 2 ) is the amount of lithium ion per area on the A w side, the A z side is the negative electrode active material layer on the back side of the A w side, and A z1 (mol/m 2 ) is the amount of lithium ion per area on the A z side.

2. The nonaqueous lithium power storage element according to claim 1 , wherein (C x1 +C x2 +A y1 )/(C y1 +C y2 +A x1 ) is 0.70 to 1.30.

3. The nonaqueous lithium power storage element according to claim 1 , wherein (C x1 +C x2 +A y1 )/(C y1 +C y2 +A x1 ) is 0.80 to 1.20.

4. The nonaqueous lithium power storage element according to claim 1 , wherein
the positive electrode contains one or more compounds selected from the group consisting of compounds represented by the following formulas (1) to (3):
LiX 1 —OR 1 O—X 2 Li  (1)

where R 1 is an alkylene group of 1 to 4 carbon atoms or a halogenated alkylene group of 1 to 4 carbon atoms, and X 1 and X 2 are each independently —(COO) n (where n is 0 or 1),
LiX 1 —OR 1 O—X 2 R 2   (2)

where R 1 is an alkylene group of 1 to 4 carbon atoms or a halogenated alkylene group of 1 to 4 carbon atoms, R 2 is hydrogen, an alkyl group of 1 to 10 carbon atoms, a mono- or polyhydroxyalkyl group of 1 to 10 carbon atoms, an alkenyl group of 2 to 10 carbon atoms, a mono- or polyhydroxyalkenyl group of 2 to 10 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, or an aryl group, and X 1 and X 2 are each independently —(COO) n (where n is 0 or 1), and
R 2 X 1 —OR 1 O—X 2 R 3   (3)

where R 1 is an alkylene group of 1 to 4 carbon atoms or a halogenated alkylene group of 1 to 4 carbon atoms, R 2 and R 3 are each independently hydrogen, an alkyl group of 1 to 10 carbon atoms, a polyhydroxyalkyl group of 1 to 10 carbon atoms, an alkenyl group of 2 to 10 carbon atoms, a mono- or polyhydroxyalkenyl group of 2 to 10 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms or an aryl group, and X 1 and X 2 are each independently —(COO) n (where n is 0 or 1),
at 1.60×10 −4 mol/g to 300×10 −4 mol/g per unit weight of the positive electrode active material layer.

5. The nonaqueous lithium power storage element according to claim 4 , wherein
C y3 is 1.60×10 −4 to 300×10 −4 , where C y3 (mol/g) is the content of compounds represented by formulas (1) to (3) per unit weight of the C y side.

6. The nonaqueous lithium power storage element according to claim 5 , wherein
C y3 /A y3 is 0.2 to 20, where A y3 (mol/g) is the content of the compound represented by formulas (1) to (3) on the A y side.

7. The nonaqueous lithium power storage element according to claim 1 , wherein the amount of active material C z1 (g/m 2 ) per area on the C z side is 10 to 50, the amount of lithium compound C z2 (g/m 2 ) per area on the C z side is 0.1 to 18.0, and C z2 /C z1 is 0.03 to 0.5, where the C z side is the positive electrode active material layer facing the A z side.

8. The nonaqueous lithium power storage element according to claim 7 , wherein
the lithium compound is lithium carbonate, and
in an image obtained by microscopic Raman spectroscopy of the C z side, S z is 1% to 40%, where S z (%) is the area ratio of carbonate ion mapping.

9. The nonaqueous lithium power storage element according to claim 7 , wherein
the C z side contains one or more compounds selected from the group consisting of compounds represented by the following formulas (1) to (3):
LiX 1 —OR 1 O—X 2 Li  (1)

where R 1 is an alkylene group of 1 to 4 carbon atoms or a halogenated alkylene group of 1 to 4 carbon atoms, and X 1 and X 2 are each independently —(COO) n (where n is 0 or 1),
LiX 1 —OR 1 O−X 2 R 2   (2)

where R 1 is an alkylene group of 1 to 4 carbon atoms or a halogenated alkylene group of 1 to 4 carbon atoms, R 2 is hydrogen, an alkyl group of 1 to 10 carbon atoms, a mono- or polyhydroxyalkyl group of 1 to 10 carbon atoms, an alkenyl group of 2 to 10 carbon atoms, a mono- or polyhydroxyalkenyl group of 2 to 10 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, or an aryl group, and X 1 and X 2 are each independently —(COO) n (where n is 0 or 1), and
R 2 X 1 —OR 1 O—X 2 R 3   ( 3)

where R 1 is an alkylene group of 1 to 4 carbon atoms or a halogenated alkylene group of 1 to 4 carbon atoms, R 2 and R 3 are each independently hydrogen, an alkyl group of 1 to 10 carbon atoms, a polyhydroxyalkyl group of 1 to 10 carbon atoms, an alkenyl group of 2 to 10 carbon atoms, a mono- or polyhydroxyalkenyl group of 2 to 10 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms or an aryl group, and X 1 and X 2 are each independently —(COO) n (where n is 0 or 1), and
C z3 is 1.60×10 −4 to 300×10 −4 , where C z3 (mol/g) is the content of the compound represented by formulas (1) to (3) per unit weight on the C z side.

10. The nonaqueous lithium power storage element according to claim 9 , wherein C z3 /A z3 is 0.2 to 20, where A z3 (mol/g) is the content of the compound represented by formulas (1) to (3) per unit weight on the A z side of the negative electrode active material layer.

11. The nonaqueous lithium power storage element according to claim 1 , wherein the ratio A w2 /A z2 , of the amount of negative electrode active material A w2 (g/m 2 ) per area on the

Assignees

• Asahi Chemical Ind

Inventors

• Umetsu Kazuteru
• Kamijo Takeshi
• Hirakawa Yuichiro
• Kusuzaka Keita
• Okada Nobuhiro
• Suetomi Taku

Classifications

• H01G11/70

  characterised by their structure · CPC title

• H01G11/26

  characterised by their structure, e.g. multi-layered, porosity or surface features · CPC title

• H01M10/052

  Li-accumulators · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01M10/0585

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