Asahi Kasei Kabushiki Kaisha

Kazuteru Umetsu

Nobuhiro Okada

Yuichiro Hirakawa

Yuima Kimura

Hitoshi Morita

Keita Kusuzaka

Takeshi Kamijo

Yusuke Yamahata

Tadashi Matsushita

Koichi Hiraoka

Taku Suetomi

Atsushi Hosokibara

Kimiya Murakami

Kazuaki Takada

Tekeshi Kamijo

Fumiya Nakamura

A non-aqueous lithium power storage element that includes a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte, the positive electrode having a positive electrode collector and a positive electrode active material layer that includes active carbon, and the non-aqueous lithium power storage element having configuration (1) and/or (2). (1) The negative electrode includes a negative electrode collector and a negative electrode active material layer (2) The non-aqueous electrolyte contains (A) LiPFand/or LiBF, (B) an imide lithium salt, and (C) an oxalate-complex lithium salt, the ratio of the mass of component (C) to the total mass of components (A) and (B) being 1.0-10.0 mass %.

Non-aqueous lithium power storage element

Provided herein is a method for producing a non-aqueous alkali metal electricity storage element, comprising a voltage application step of applying a voltage to a non-aqueous alkali metal electricity storage element precursor comprising a positive electrode precursor, a negative electrode, a separator, and a non-aqueous electrolytic solution, housed in a casing, wherein a positive electrode active material layer of the positive electrode precursor comprises a positive electrode active material and an alkali metal compound other than the positive electrode active material.

Method for producing non-aqueous alkali metal electricity storage element

Provided is a positive electrode precursor having a positive electrode active material layer, wherein the mass proportion Aof a carbon material in the positive electrode active material layer accounts for 15-65 mass %, the mass proportion Aof a lithium transition metal oxide in the positive electrode active material layer accounts for 5-35 mass %, the mass proportion Aof an alkali metal compound in the positive electrode active material layer accounts for 10-50 mass %, A/Ais 0.10-2.00, A/Ais 0.50-3.00, and the positive electrode active material layer has a peel strength of 0.02-3.00 N/cm.

Positive electrode coating liquid, positive electrode precursor, and nonaqueous lithium electric storage element

A lithium ion secondary cell comprising a positive electrode, a negative electrode, and a non-aqueous electrolyte that contains lithium ions, the lithium ion secondary cell being such that: the positive electrode has a positive electrode current collector and a positive electrode active material layer; the positive electrode active material layer contains a positive electrode active material and a lithium compound; the positive electrode active material includes a transition metal oxide; the concentration of the lithium compound, which is the portion other than the positive electrode active material in the positive electrode active material layer, is 0.1-10 mass %; the negative electrode has a negative electrode current collector and a negative electrode active material layer; the negative electrode active material layer contains 50-95 mass % of a carbon material and 5-50 mass % of an alloy-based active material.

Lithium ion secondary battery

Provided is a non-aqueous lithium-type electricity storage element which includes a positive electrode current collector having a positive electrode active material layer disposed thereon, wherein, in a solid-stateLi-NMR spectrum of the positive electrode active material layer, a signal area ratio a/b, which is the ratio of a signal area ratio of component A having a signal at least at &#x2212;2 to 2.5 ppm to a signal area of component B having a signal at &#x2212;6 to &#x2212;2.5 ppm is 1.5 to 20.0.

Non-aqueous lithium-type electricity storage element

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&#xd7;10to 300&#xd7;10mol/g per unit mass of the positive electrode active material layer. LiX&#x2014;ORO&#x2014;XLi (1) LiX&#x2014;ORO&#x2014;XR(2) RX&#x2014;ORO&#x2014;XR(3) (In the formulas, RR, RX, and Xrepresent groups defined in the specification of the application.)

Nonaqueous lithium-type power storage element

This positive electrode precursor includes: a positive electrode active material containing a carbon material and an alkali metal compound, wherein 5&#x2264;A&#x2264;35, when A (g/m) is a weight of the alkali metal compound in the positive electrode active material layer at one surface of the positive electrode precursor, 10&#x2264;B&#x2264;100 as well as 0.20&#x2264;A/B&#x2264;1.00, when B (g/m) is a weight of the positive electrode active material in the positive electrode active material layer, and 1&#x2264;C&#x2264;20, when C (m/cm) is a specific surface area per unit area as measured by the BET method at one surface of the positive electrode precursor.

Positive electrode precursor

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.

Provided is a nonaqueous lithium power storage element that can suppress excessive decomposition of a lithium compound remaining in a positive electrode, can suppress gas generation at high voltages, and can suppress capacity declines during high-load charge/discharge cycling. The nonaqueous lithium power storage element according to the present embodiment has a positive electrode that contains a lithium compound other than an active material, a negative electrode, a separator, and a lithium ion-containing nonaqueous electrolyte, wherein in the elemental map provided by SEM-EDX of the surface of the positive electrode, the area overlap ratio Uof the fluorine map relative to the oxygen map, as provided by binarization based on the average value of the brightness values, is 40% to 99%.

Nonaqueous lithium power storage element

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.

Nonaqueous lithium storage element

Provided is a nonaqueous lithium-type power storage element in which a lithium compound is included in positive electrode, wherein energy loss due to voltage decrease under high temperatures and high voltages is reduced, and the high-load charge and discharge cycle characteristics are exceptional.

The disclosure provides a nonaqueous lithium-type power storage element having a positive electrode, a negative electrode, a separator, and a nonaqueous electrolytic solution containing lithium ions.

This nonaqueous lithium power storage element contains a positive electrode, a negative electrode, a separator, and a nonaqueous electrolyte that contains lithium ions. The positive electrode has a positive electrode current collector and a positive electrode active material layer disposed on one surface or both surfaces of the positive electrode current collector, and the positive electrode active material layer contains a positive electrode active material that contains a carbon material. When the pore distribution of the positive electrode active material layer is measured by mercury intrusion, the pore distribution curve for the relationship between the pore diameter and log differential pore volume has at least one peak having a peak value of 1.0-5.0 mL/g for the log differential pore volume in the pore diameter range of 0.1-50 &#x3bc;m, and the total cumulative pore volume Vp in the pore diameter range of 0.1-50 &#x3bc;m is 0.7-3.0 mL/g.

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.

The disclosure provides a nonaqueous lithium power storage element comprising a positive electrode containing a lithium compound other than an active material, a negative electrode, a separator and a nonaqueous electrolytic solution containing a lithium ion, wherein the expression 0.1 &#x3bc;m&#x2264;X&#x2264;10.0 &#x3bc;m is satisfied, where Xis the mean particle diameter of the lithium compound, the expressions 2.0 &#x3bc;m&#x2264;Y&#x2264;20.0 &#x3bc;m and X&#x3c;Yare satisfied, where Yis the mean particle diameter of a positive electrode active material, and the amount of lithium compound in the positive electrode is 1 weight % to 50 weight %.

Growing community of inventors

Tokyo, Japan

Kazuteru Umetsu