Powdery material, electrode member, and method for manufacturing same for a secondary cell
AssigneeCanon Kabushiki Kaisha
InventorSoichiro Kawakami
Life of this patent
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Abstract
There are disclosed a powdery material comprising a hydrogen-storing compound comprising a core layer of a hydrogen-storing alloy coated with a transition metal oxide layer and having a transition metal dispersed and carried on the outermost surface thereof, an electrode member for alkali secondary cells using the powdery material comprising a hydrogen-storing compound, and a secondary cell using the electrode member as an electrode. With such an alkali secondary cell, a strong resistance to overcharge, a high charging and discharging efficiency and a long cycle life can be implemented.
Claims103
A powdery material having a function of storing and releasing hydrogen, comprising a compound which electrochemically stores and releases hydrogen, said powdery material having a structure of at least three layers comprising:
- a core of a hydrogen-storing alloy;
- a metal oxide layer provided on the surface of said core and having a function of preventing the oxidation of the alloy and allowing atomic hydrogen or hydrogen ions to pass therethrough;
- and
- a metal element dispersed on the surface of said metal oxide layer and having a function of activating hydrogen.
A battery electrode member formed of a powdery material having a function of storing and releasing hydrogen and having a function of electrochemically storing and releasing hydrogen, said powdery material having a structure of at least three layers comprising:
- a core of a hydrogen-storing alloy;
- a metal oxide layer provided on the surface of said core and having a function of preventing the oxidation of the alloy and allowing atomic hydrogen or hydrogen ions to pass therethrough;
- and
- a metal element dispersed on the surface of said metal oxide layer and having a function of activating hydrogen.
A secondary cell comprising at least a negative electrode, an electrolyte and a positive electrode, using an alkali for the electrolyte,
- said negative electrode being formed of a powdery material comprising a compound having a function of storing and releasing hydrogen, and said powdery material having a structure of at least three layers comprising:
- a core of a hydrogen-storing alloy;
- a metal oxide layer provided on the surface of said core and having a function of preventing the oxidation of the alloy and allowing atomic hydrogen or hydrogen ions to pass therethrough;
- and a metal element dispersed on the surface of said metal oxide layer and having a function of activating hydrogen.
A powdery material comprising nickel hydroxide coated either with a compound higher in conductivity than nickel hydroxide comprising at least one element selected from cobalt element and nickel element and oxygen element, containing 0.5 atomic % to 10 atomic % of at least one element selected from lithium, potassium, manganese, aluminum, zinc, magnesium, molybdenum, tungsten, vanadium or titanium, or with a compound higher in conductivity than nickel hydroxide comprising at least one transition metal element selected from molybdenum, tungsten, vanadium or titanium and oxygen and hydrogen elements.
An electrode member composed of a powdery material comprising nickel hydroxide coated either with a compound higher in conductivity than nickel hydroxide comprising at least one element selected from cobalt, nickel or oxygen, containing 0.5 atomic % to 10 atomic % of at least one element selected from lithium, potassium, manganese, aluminum, zinc, magnesium, molybdenum, tungsten, vanadium or titanium, or with a compound higher in conductivity than nickel hydroxide comprising at least one transition metal element selected from molybdenum, tungsten, vanadium or titanium and oxygen and hydrogen elements.
A secondary cell comprising at least a negative electrode, a positive electrode and an electrolyte, using an alkali for the electrolyte, wherein
- said positive electrode is composed of a powdery material comprising nickel hydroxide coated either with a compound higher in conductivity than nickel hydroxide comprising at least one element selected from cobalt, nickel or oxygen element, containing 0.5 atomic % to 10 atomic % of at least one element selected from lithium, potassium, manganese, aluminum, zinc, magnesium, molybdenum, tungsten, vanadium or titanium, or with a compound higher in conductivity than nickel hydroxide comprising at least one transition metal element selected from molybdenum, tungsten, vanadium and titanium and oxygen and hydrogen elements.
A secondary cell comprising at least a negative electrode, a positive electrode and an alkali electrolyte, wherein said negative electrode is composed of a powdery material comprising a compound having a function of storing and releasing hydrogen, said powdery material having a structure of at least three layers comprising:
- a core of a hydrogen-storing alloy;
- a metal oxide layer provided on the surface of said core and having a function of preventing the oxidation of the alloy and allowing atomic hydrogen or hydrogen ions to pass therethrough;
- and a metal element dispersed on the surface of said metal oxide layer and having a function of activating hydrogen;
- and
- said positive electrode is composed of a powdery material as the main material comprising nickel hydroxide coated either with a compound higher in conductivity than nickel hydroxide comprising at least one element selected from cobalt, nickel, or oxygen, containing 0.5 atomic % to 10 atomic % of at least one element selected from lithium, potassium, manganese, aluminum, zinc, magnesium, molybdenum, tungsten, vanadium or titanium or with a compound higher in conductivity than nickel hydroxide comprising at least one transition metal element selected from molybdenum, tungsten, vanadium and titanium and oxygen and hydrogen elements.
A method for manufacturing a powdery material comprising a compound having a function of electrochemically storing and releasing hydrogen,
- comprising at least the steps of:
- preparing a core comprising a hydrogen-storing alloy;
- forming on the surface of said core a metal oxide layer having a function of preventing the oxidation of the alloy and allowing atomic hydrogen or hydrogen ions to pass through;
- and
- dispersing on the surface of said metal oxide layer a metal element having a function of activating hydrogen.
The method for manufacturing a powdery material comprising the step of preparing a powdery material comprising nickel hydroxide coated either with a compound higher in conductivity than nickel hydroxide comprising at least one element or more selected from cobalt, nickel oxygen element, containing 0.5 atomic % to 10 atomic % of at least one element selected from lithium, potassium, manganese, aluminum, zinc, manganese, molybdenum, tungsten, vanadium or titanium or with a compound higher in conductivity than nickel hydroxide comprising at least one transition metal element selected at least from molybdenum, tungsten, vanadium or titanium and oxygen and hydrogen elements.
A powdery material having a function of storing and releasing hydrogen comprising a hydrogen storage core part comprising a magnesium-nickel alloy and a metal oxide layer provided on the surface of said core part having a function of preventing the oxidation of the alloy and allowing atomic hydrogen or hydrogen ions to pass therethrough.
A battery electrode member formed of a powdery material having a function of electrochemically storing and releasing hydrogen, said powdery material comprising a hydrogen storage core part comprising a magnesium-nickel alloy, and a metal oxide layer provided on the surface of said core part having a function of preventing the oxidation of the alloy and allowing atomic hydrogen or hydrogen ions to pass therethrough.
A secondary cell comprising at least a negative electrode, an electrolyte and a positive electrode, using an alkali for the electrolyte, said negative electrode being formed of a powdery material comprising a hydrogen storage core part comprising a magnesium-nickel alloy, and a metal oxide layer provided on the surface of said core part having a function of preventing the oxidation of the alloy and allowing atomic hydrogen or hydrogen ions to pass therethrough.
A secondary cell comprising at least a negative electrode, an electrolyte and a positive electrode, using an alkali for the electrolyte, said negative electrode being formed of a powdery material comprising a hydrogen storage core part comprising a magnesium-nickel alloy, and a metal oxide layer provided on the surface of said core part having a function of preventing the oxidation of the alloy and allowing atomic hydrogen or hydrogen ions to pass therethrough;
- and said positive electrode being composed of a powdery material comprising nickel hydroxide coated either with a compound higher in conductivity than nickel hydroxide comprising at least on element selected from cobalt or nickel elements and oxygen element, containing 0.5 atomic % to 10 atomic % of at least one element selected from lithium, potassium, manganese, aluminum, zinc, magnesium, molybdenum, tungsten, vanadium or titanium or with a compound higher in conductivity than nickel hydroxide comprising at least one transition metal element selected from molybdenum, tungsten, vanadium or titanium or oxygen and hydrogen elements.
A method for manufacturing a powdery material having a function of storing and releasing hydrogen comprising at least the steps of:
- preparing a hydrogen storage core part comprising a magnesium-nickel alloy;
- and
- providing a metal oxide layer on the surface of said core part having a function of preventing the oxidatin of the alloy and allowing atomic hydrogen or hydrogen ions to pass therethrough.
Dependencies are inferred from the claim text.