Lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-11038173-B2
Application number	US-201716070331-A
Country	US
Kind code	B2
Filing date	Jan 20, 2017
Priority date	Jan 22, 2016
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

A lithium ion secondary battery of the present disclosure is provided with a positive electrode, a negative electrode, a separator, and a nonaqueous electrolyte containing lithium ions.

First claim

The invention claimed is:

1. A lithium ion secondary battery comprising a positive electrode, a negative electrode, a separator and a lithium ion-containing nonaqueous electrolytic solution, wherein,
the negative electrode has a negative electrode power collector, and a negative electrode active material layer containing a negative electrode active material provided on one or both sides of the negative electrode power collector,
the positive electrode has a positive electrode power collector, and a positive electrode active material layer containing a positive electrode active material provided on one or both sides of the positive electrode power collector, the positive electrode active material containing a transition metal oxide capable of intercalating and releasing lithium ions, and
the positive electrode active material layer comprises 3.8×10 −9 mol/g to 3.0×10 −2 mol/g of one or more compounds selected from the group consisting of the following formulas (1) to (3) per unit weight of the positive electrode active material layer;

[Chemical Formula 1]
LiX 1 —OR 1 O—X 2 Li   (1)

in formula (1), R 1 is —C 2 H 4 — or —C 3 H 6 —, and X 1 and X 2 are each independently —(COO) n (where n is 0 or 1),
[Chemical Formula 2]
LiX 1 —OR 1 O—X 2 R 2    (2)

in formula (2), R 1 —C 2 H 4 — or —C 3 H 6 —, R 2 is hydrogen, —CH 3 or —C 2 H 5 , and X 1 and X 2 are each independently —(COO) n (where n is 0 or 1), and
[Chemical Formula 3]
R 2 X 1 —OR 1 O—X 2 R 3    (3)

in formula (3), R 1 is —C 2 H 4 — or —C 3 H 6 —, R 2 and R 3 are each independently hydrogen, —CH 3 or —C 2 H 5 , and X 1 and X 2 are each independently —(COO) n (where n is 0 or 1), and
wherein 1.04≤b/a≤5.56 is satisfied, where, in a solid 7 Li—NMR spectrum of the positive electrode active material layer, “a” is the peak area at −40 ppm to 40 ppm, obtained by measurement with a repeated latency of 10 seconds, and “b” is the peak area at −40 ppm to 40 ppm, obtained by measurement with a repeated latency of 3000 seconds.

2. The lithium ion secondary battery according to claim 1 , wherein a pore distribution curve representing the relationship between pore size and log differential pore volume, in measurement of the pore distribution of the positive electrode active material layer by mercury intrusion, has at least one peak with a peak value of 0.10 mL/g to 1.0 mL/g for the log differential pore volume in a pore size range of 0.3 μm to 50 μm, and a total cumulative pore volume Vp in the pore size range of 0.3 μm to 50 μm is 0.03 mL/g to 0.2 mL/g.

3. The lithium ion secondary battery according to claim 1 , wherein a pore distribution curve representing the relationship between pore size and log differential pore volume, in measurement of the pore distribution of the positive electrode active material layer by mercury intrusion, has at least two peaks with a peak value of 0.10 mL/g to 1.0 mL/g for the log differential pore volume in the pore size range of 0.1 μm to 50 μm.

4. The lithium ion secondary battery according to claim 1 , wherein a pore distribution curve representing the relationship between pore size and log differential pore volume, in measurement of the pore distribution of the positive electrode active material layer by mercury intrusion, has at least one peak with a peak value of 0.10 mL/g to 1.0 mL/g for the log differential pore volume in the pore size range of 0.5 μm to 20 μm.

5. The lithium ion secondary battery according to claim 1 , wherein the negative electrode active material contains an alloy-type negative electrode material that forms an alloy with lithium.

6. The lithium ion secondary battery according to claim 5 , wherein the alloy-type negative electrode material is one or more selected from the group consisting of silicon, silicon compounds, tin, tin compounds, and composite materials of these with carbon or carbonaceous materials.

7. The lithium ion secondary battery according to claim 5 , wherein a film thickness of the negative electrode active material layer is 10 μm to 75 μm for each side.

8. The lithium ion secondary battery according to claim 1 , wherein the positive electrode contains one or more lithium compounds different from the transition metal oxide, and a mean particle diameter of the lithium compound is 0.1 μm to 10 μm.

9. The lithium ion secondary battery according to claim 8 , wherein the lithium compound is one or more lithium compounds selected from the group consisting of lithium carbonate, lithium oxide and lithium hydroxide.

10. The lithium ion secondary battery according to claim 8 , wherein the lithium compound in the positive electrode is lithium carbonate.

11. The lithium ion secondary battery according to claim 1 , wherein the separator contains a polymer that swells by infiltration of the nonaqueous electrolytic solution.

12. The lithium ion secondary battery according to claim 1 , wherein the separator contains a solid electrolyte.

13. The lithium ion secondary battery according to claim 12 , wherein the solid electrolyte contains one or more compounds selected from among inorganic oxides and inorganic sulfides having lithium ion conductivity.

14. A power storage module employing a lithium ion secondary battery according to claim 1 .

15. A power regenerating system employing a lithium ion secondary battery according to claim 1 .

16. A power load-leveling system employing a lithium ion secondary battery according to claim 1 .

17. An uninterruptable power source system employing a lithium ion secondary battery according to claim 1 .

18. A non-contact power supply system employing a lithium ion secondary battery according to claim 1 .

19. An energy harvesting system employing a lithium ion secondary battery according to claim 1 .

20. A power storage system employing a lithium ion secondary battery according to claim 1 .

Assignees

• Asahi Chemical Ind

Inventors

• Umetsu Kazuteru
• Morita Hitoshi
• Okada Nobuhiro
• Kusuzaka Keita
• Kamijo Takeshi

Classifications

• H01G11/06 Primary

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M4/364

  as mixtures · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title