Nonaqueous lithium storage element

Patent metadata

Field	Value
Publication number	US-10825616-B2
Application number	US-201916502499-A
Country	US
Kind code	B2
Filing date	Jul 3, 2019
Priority date	Jan 22, 2016
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

Method of preparing a nonaqueous lithium power storage element, by providing a nonaqueous lithium power storage element comprising a positive electrode precursor containing a lithium compound other than an active material, a negative electrode, a separator, a nonaqueous electrolytic solution containing lithium ions, and a casing; and applying a voltage of 4.2V or more to the nonaqueous lithium power storage element to decompose the lithium compound in the positive electrode precursor and pre-dope the negative electrode with the lithium ions, while releasing a gas generated from decomposition of the lithium compound either out of an opening of the casing or through a degassing valve or gas permeable film.

First claim

What is claimed is:

1. A method of preparing a nonaqueous lithium power storage element, comprising:
providing a nonaqueous lithium power storage element comprising a positive electrode precursor containing a lithium compound other than an active material, a negative electrode, a separator, a nonaqueous electrolytic solution containing lithium ions, and a casing; and
applying a voltage of 4.2V or more to the nonaqueous lithium power storage element with a portion of the casing in an open state, to decompose the lithium compound in the positive electrode precursor and pre-dope the negative electrode with the lithium ions, while releasing a gas generated from decomposition of the lithium compound out of an opening of the casing.

2. The method according to claim 1 , wherein an environmental temperature of the nonaqueous lithium power storage element is 25° C. or more and 45° C. or less.

3. The method according to claim 1 , wherein the positive electrode precursor has a positive electrode power collector, and a positive electrode active material layer containing a positive electrode active material, formed on one side or both sides of the positive electrode power collector, and
wherein the negative electrode has a negative electrode power collector, and a negative electrode active material layer containing a negative electrode active material, formed on one side or both sides of the negative electrode power collector.

4. The method according to claim 3 , wherein a positive electrode is formed after pre-doping the negative electrode with the lithium ions, and in the positive electrode, the lithium compound is other than the positive electrode active material.

5. The method according to claim 4 , wherein a nonaqueous lithium power storage element obtained by the method comprises the positive electrode, the negative electrode, the separator, the nonaqueous electrolytic solution, and the casing, and
wherein the expression 0.1 μm≤X 1 ≤10.0 μm is satisfied, where X 1 is the mean particle diameter of the lithium compound, the expressions 2.0 μm≤Y 1 ≤20.0 μm and X 1 <Y 1 are satisfied, where Y 1 is the mean particle diameter of the positive electrode active material, and an amount of the lithium compound in the positive electrode is 1 weight % to 50 weight %.

6. The method according to claim 5 , wherein X 1 is 0.5 μm to 5.0 μm.

7. The method according to claim 5 , wherein the amount of the lithium compound in the positive electrode is 2 weight % to 20 weight %.

8. The method according to claim 4 , wherein the positive electrode active material is an activated carbon satisfying 0.3<V 1 ≤0.8 and 0.5≤V 2 ≤1.0, where V 1 (cc/g) is the mesopore volume due to pores with diameters of 20 Å to 500 Å as calculated by the BJH method, and V 2 (cc/g) is the micropore volume due to pores with diameters of smaller than 20 Å as calculated by the MP method, and having a specific surface area of 1,500 m 2 /g to 3,000 m 2 /g, as measured by the BET method.

9. The method according to claim 4 , wherein the positive electrode active material is an activated carbon satisfying 0.8<V 1 ≤2.5 and 0.8<V 2 ≤3.0, where V 1 (cc/g) is the mesopore volume due to pores with diameters of 20 Å to 500 Å as calculated by the BJH method, and V 2 (cc/g) is the micropore volume due to pores with diameters of smaller than 20 Å as calculated by the MP method, and having a specific surface area of 2,300 m 2 /g to 4,000 m 2 /g, as measured by the BET method.

10. The method according to claim 1 , wherein the lithium compound is lithium carbonate, lithium oxide or lithium hydroxide.

11. A method of preparing a nonaqueous lithium power storage element, comprising:
providing a nonaqueous lithium power storage element comprising a positive electrode precursor containing a lithium compound other than an active material, a negative electrode, a separator, a nonaqueous electrolytic solution containing lithium ions, and a casing equipped with a degassing valve or gas permeable film; and
applying a voltage of 4.2V or more to the nonaqueous lithium power storage element, to decompose the lithium compound in the positive electrode precursor and pre-dope the negative electrode with the lithium ions, while releasing a gas generated from decomposition of the lithium compound through the degassing valve or gas permeable film.

12. The method according to claim 11 , wherein the degassing valve is a check-valved degassing valve.

13. The method according to claim 11 , wherein an environmental temperature of the nonaqueous lithium power storage element is 25° C. or more and 45° C. or less.

14. The method according to claim 11 , wherein the positive electrode precursor has a positive electrode power collector, and a positive electrode active material layer containing a positive electrode active material, formed on one side or both sides of the positive electrode power collector, and
wherein the negative electrode has a negative electrode power collector, and a negative electrode active material layer containing a negative electrode active material, formed on one side or both sides of the negative electrode power collector.

15. The method according to claim 14 , wherein a positive electrode is formed after pre-doping the negative electrode with the lithium ions, and in the positive electrode, the lithium compound is other than the positive electrode active material.

16. The method according to claim 15 , wherein a nonaqueous lithium power storage element obtained by the method comprises the positive electrode, the negative electrode, the separator, the nonaqueous electrolytic solution, and the casing, and
wherein the expression 0.1 μm≤X 1 ≤10.0 μm is satisfied, where X 1 is the mean particle diameter of the lithium compound, the expressions 2.0 μm≤Y 1 ≤20.0 μm and X 1 <Y 1 are satisfied, where Y 1 is the mean particle diameter of the positive electrode active material, and an amount of the lithium compound in the positive electrode is 1 weight % to 50 weight %.

17. The method according to claim 16 , wherein X 1 is 0.5 μm to 5.0 μm.

18. The method according to claim 16 , wherein the amount of the lithium compound in the positive electrode is 2 weight % to 20 weight %.

19. The method according to claim 15 , wherein the positive electrode active material is an activated carbon satisfying 0.3<V 1 ≤0.8 and 0.5≤V 2 ≤1.0, where V 1 (cc/g) is the mesopore volume due to pores with diameters of 20 Å to 500 Å as calculated by the BJH method, and V 2 (cc/g) is the micropore volume due to pores with diameters of smaller than 20 Å as calculated by the MP method, and having a specific surface area of 1,500 m 2 /g to 3,000 m 2 /g, as measured by the BET method.

20. The method according to claim 15 , wherein the positive electrode active material is an activated carbon satisfying 0.8<V 1 ≤2.5 and 0.8<V 2 ≤3.0, where V 1 (cc/g) is the mesopore volume due to pores with diameters of 20 Å to 500 Å as calculated by the BJH method, and V 2 (cc/g) is the micropore volume due to pores with diameters of smaller than 20 Å as calculated by the MP method, and having a specific surface area of 2,300 m 2 /g to 4,000 m 2 /g, as measured by the BET method.

21. The method according to claim 11 , wherein the lithium compound is lithium carbonate, lithium oxide or lithium hydroxide.

Assignees

• Asahi Chemical Ind

Inventors

• Umetsu Kazuteru
• Okada Nobuhiro
• Kamijo Takeshi

Classifications

• Y02P70/50

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

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/133

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

• H01G11/70

  characterised by their structure · CPC title