Nonaqueous lithium-type power storage element

Patent metadata

Field	Value
Publication number	US-11387052-B2
Application number	US-202016819383-A
Country	US
Kind code	B2
Filing date	Mar 16, 2020
Priority date	Jan 22, 2016
Publication date	Jul 12, 2022
Grant date	Jul 12, 2022

Abstract

A nonaqueous lithium-type power storage element comprising a positive electrode, a negative electrode, a separator, and a nonaqueous electrolytic solution containing lithium ions. The negative electrode has: a negative electrode collector; and a negative electrode active material layer containing a negative electrode active material, said negative electrode active material layer being provided on one surface or both surfaces of the negative electrode collector. The negative electrode active material contains a carbonaceous material capable of storing or releasing lithium ions. Furthermore, the positive electrode has: a positive electrode collector; and a positive electrode active material layer containing a cathode active material, said positive electrode active material layer being provided on one surface or both surfaces of the positive electrode collector. The positive electrode active material contains activated carbon. Also, the positive electrode active material layer contains one or more compounds selected from formulas (1) to (3) in an amount of 1.60×10−4 to 300×10−4 mol/g per unit mass of the positive electrode active material layer. LiX1—OR1O—X2Li (1) LiX1—OR1O—X2R2 (2) R2X1—OR1O—X2R3 (3) (In the formulas, R1R2, R3X1, and X2 represent groups defined in the specification of the application.)

First claim

What is claimed is:

1. A method for producing a nonaqueous lithium-type power storage element, the method comprising:
providing a nonaqueous lithium-type power storage element with a positive electrode, a negative electrode, a separator and a nonaqueous electrolytic solution containing lithium ions;
aging step in which the nonaqueous lithium-type power storage element is maintained at a temperature of 40° C. or more to decompose the nonaqueous electrolytic solution,
wherein the step of providing a nonaqueous lithium-type power storage element comprises:
providing a positive electrode precursor having a positive electrode power collector and a positive electrode active material layer provided on one side or both sides of the positive electrode power collector, wherein the positive electrode active material layer contains a positive electrode active material, and alithium compound other than the positive electrode active material,
providing a negative electrode having a negative electrode power collector and a negative electrode active material layer provided on one side or both sides of the negative electrode power collector, wherein the negative electrode active material layer contains a negative electrode active material comprising a carbon material capable of intercalating and releasing lithium ions,
laminating the positive electrode precursor and the negative electrode with a separator interposed therebetween to obtain an electrode laminated body, or winding the positive electrode precursor and the negative electrode with a separator interposed therebetween to obtain an electrode wound body,
housing the electrode laminated body or electrode wound body in a casing, injecting a nonaqueous electrolytic solution into the casing, and sealing the casing, and
pre-doping the negative electrode active material layer with the lithium ions by decomposing the lithium compound by applying a voltage between the positive electrode precursor and the negative electrode to decompose the lithium compound in the positive electrode precursor and release the lithium ions followed by reducing the lithium ions at the negative electrode,

wherein the negative electrode in the nonaqueous lithium-type power storage element has a negative electrode power collector and a negative electrode active material layer containing a negative electrode active material provided on one side or both sides of the negative electrode power collector, and the negative electrode active material contains a carbon material capable of intercalating and releasing lithium ions,
wherein the positive electrode in the nonaqueous lithium-type power storage element has a positive electrode power collector and a positive electrode active material layer containing a positive electrode active material provided on one side or both sides of the positive electrode power collector, and the positive electrode active material contains activated carbon,
wherein the positive electrode active material layer in the nonaqueous lithium-type power storage element contains 1.60×10 −4 mol/g to 300×10 −4 mol/g of one or more types of compounds selected from compounds represented by the following formulas (1) to (3) per unit weight of the positive electrode active material layer:
[Chem. 1]
LiX 1 —OR 1 O—X 2 Li  (1)

(wherein, R 1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, and X 1 and X 2 respectively and independently represent —(COO) n (wherein, n represents 0 or 1)),
[Chem. 2]
LiX 1 —OR 1 O—X 2 R 2   (2)

(wherein, R 1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, R 2 represents a group selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a mono- or polyhydroxyalkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a mono- or polyhydroxyalkenyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms and an aryl group, and X 1 and X 2 respectively and independently represent —(COO) n (wherein, n represents 0 or 1)), and
[Chem. 3]
R 2 X 1 —OR 1 O—X 2 R 3   (3)

(wherein, R 1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, R 2 and R 3 respectively and independently represent a group selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a mono- or polyhydroxyalkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a mono- or polyhydroxyalkenyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms and an aryl group, and X 1 and X 2 respectively and independently represent —(COO) n (wherein, n represents 0 or 1)), and
wherein the positive electrode active material layer in the nonaqueous lithium-type power storage element contains a lithium compound other than the active material, and an amount of lithium in the active material layer is calculated from the area of a peak appearing at −40 ppm to 40 ppm in a 7 Li-solid state NMR spectrum, and the amount of lithium is 10.0×10 −4 mol/g to 300×10 −4 mol/g.

2. The method according to claim 1 , wherein the aging step is carried out at a temperature of 40° C. to 60° C.

3. The method according to claim 1 , wherein the voltage of the nonaqueous lithium-type power storage element during the aging step is adjusted from 3.0 V to 4.0 V.

4. The method according to claim 1 , wherein the positive electrode active material layer in the nonaqueous lithium-type power storage element contains 0.30×10 −4 mol/g to 200×10 −4 mol/g of lithium fluoride per unit weight of the positive electrode active material layer.

5. The method according to claim 1 , wherein 0.20≤A/B≤20.0 when the content of the compound selected from compounds represented by the formulas (1) to (3) per unit weight of the positive electrode active material layer is defined as A and the content of the compound per unit weight of the negative electrode active material layer is defined as B.

6. The method according to claim 1 , wherein the surface of the separator has a fluorine-based particulate substance,
wherein the value obtained by dividing the percentage of fluorine atoms (atomic %) by the percentage of carbon atoms (atomic %), which is calculated from the relative element concentration of atoms obtained by XPS (X-ray photoelectron spectroscopy) measurement, on the surface of the separator in the nonaqueous lithium-type power storage element is 5.0×10 −3 to 200×10 −3 , and
wherein a particulate substance having a particle diameter of 50 nm to 500 nm is present at 1.0 particle/μm 2 to 30.0 particles/μm 2 on the separator surface during SEM observation of the separator surface.

7. The method according to claim 6 , wherein the value obtained by dividing the percentage of fluorine atoms (atomic %) by the percentage of carbon atoms (atomic %), which is calculated from the relative element concentration of atoms obtained by XPS (X-ray photoelectron spectroscopy) measurement, on the surface of the separator on the side opposing the negative electrode in the nonaqueous lithium-type power storage element is 10×10 −3 to 100×10 −3 , and
wherein a particulate substance having a particle diameter of 50 nm to 500 nm is present at 4.0 particles/μm 2 to 15.0 particles/μm 2 on the separator surface during SEM observation of the surface of the separator on the side opposing the negative electrode.

8. The method according to claim 1 , wherein the positive electrode contains a lithium compound, the lithium compound is one or more types of compounds selected from lithium ca

Assignees

• Asahi Chemical Ind

Inventors

• Kimura Yuima
• Umetsu Kazuteru
• Morita Hitoshi
• Okada Nobuhiro
• Hirakawa Yuichiro
• Yamahata Yusuke

Classifications

• H01G11/50

  specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation · CPC title

• H01M4/133

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

• H01M4/62

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

• H01M10/0585

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

• Y02E60/13

  Energy storage using capacitors · CPC title