Nonaqueous electrolytic solution secondary battery, and positive electrode and negative electrode used in the same
AssigneeNEC Corporation
InventorsTatsuji Numata, Hiroo Takahashi, Tetsuya Kajita
Life of this patent
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Abstract
Provided is a nonaqueous electrolytic solution secondary battery having a high energy density, and a positive electrode and a negative electrode used therefor. The nonaqueous electrolytic solution secondary battery includes a positive electrode and a negative electrode, wherein: the negative electrode contains a negative electrode active material having an initial charge/discharge efficiency of 75% or less when charged and discharged by employing metallic Li as a counter electrode; and the positive electrode contains a metal oxide (X) represented by AxMeOy (wherein A is Na and/or K, Me is Ni and/or Cu, x satisfies 1.9≦x≦2.1, and y satisfies 1.9≦y≦2.1).
Claims24
A nonaqueous electrolytic solution secondary battery comprising a positive electrode and a negative electrode,
- wherein the negative electrode contains a negative electrode active material having an initial charge/discharge efficiency of 75% or less when charged and discharged by employing metallic Li as a counter electrode,
- the positive electrode contains at least one metal oxide (X) represented by AxMeOy, wherein A is at least one or two species selected from Na and K, Me is at least one or two species selected from Ni and Cu, x satisfies 1.9≦x≦2.1, and y satisfies 1.9≦y≦2.1,
- the metal oxide (X) comprises Na2NiO2,
- the positive electrode includes a positive electrode active material (Z), and a content of the metal oxide (X) in the positive electrode is 2 to 20 wt % with respect to the total weight of the positive electrode active material (Z) and the metal oxide (X), and
- the negative electrode includes a metal oxide (a) capable of absorbing and emitting lithium ions as the negative electrode active material.
A positive electrode used for a nonaqueous electrolytic solution secondary battery,
- wherein the positive electrode contains a metal oxide (X) represented by AxMeOy wherein A is at least one or two species selected from Na and K, Me is at least one or two species selected from Ni and Cu, x satisfies 1.9≦x≦2.1, and y satisfies 1.9≦y≦2.1,
- the metal oxide (X) comprises Na2NiO2, and
- the positive electrode includes a positive electrode active material (Z), and a content of the metal oxide (X) in the positive electrode is 2 to 20 wt % with respect to the total weight of the positive electrode active material (Z) and the metal oxide (X).
A negative electrode used for a nonaqueous electrolytic solution secondary battery,
- wherein the negative electrode contains a negative electrode active material having an initial charge/discharge efficiency of 75% or less when charged and discharged by employing metallic Li as a counter electrode, the negative electrode being obtained by charging with a positive electrode containing a metal oxide (X) represented by AxMeOy wherein A is at least one or two species selected from Na and K, Me is at least one or two species selected from Ni and Cu, x satisfies 1.9≦x≦2.1, and y satisfies 1.9≦y≦2.1 as a counter electrode,
- the metal oxide (X) comprises Na2NiO2,
- the positive electrode includes a positive electrode active material (Z), and a content of the metal oxide (X) in the positive electrode is 2 to 20 wt % with respect to the total weight of the positive electrode active material (Z) and the metal oxide (X), and
- the negative electrode includes a metal oxide (a) capable of absorbing and emitting lithium ions as the negative electrode active material.
A nonaqueous electrolytic solution secondary battery comprising a positive electrode and a negative electrode,
- wherein the negative electrode contains a negative electrode active material having an initial charge/discharge efficiency of 75% or less when charged and discharged by employing metallic Li as a counter electrode,
- the positive electrode contains a metal oxide (X) represented by AxMeOy, wherein A is at least one or two species selected from Na and K, Me is at least one or two species selected from Ni and Cu, x satisfies 1.9≦x≦2.1, and y satisfies 1.9≦y≦2.1,
- the metal oxide (X) comprises Na2CuO2, and
- the positive electrode includes a positive electrode active material (Z), and a content of the metal oxide (X) in the positive electrode is 2 to 15 wt % with respect to the total weight of the positive electrode active material (Z) and the metal oxide (X).
A positive electrode used for a nonaqueous electrolytic solution secondary battery,
- wherein the positive electrode contains a metal oxide (X) represented by AxMeOy, wherein A is at least one or two species selected from Na and K, Me is at least one or two species selected from Ni and Cu, x satisfies 1.9≦x≦2.1, and y satisfies 1.9≦x≦2.1,
- the metal oxide (X) comprises Na2CuO2, and
- the positive electrode includes a positive electrode active material (Z), and a content of the metal oxide (X) in the positive electrode is 2 to 15 wt % with respect to the total weight of the positive electrode active material (Z) and the metal oxide (X).
A negative electrode used for a nonaqueous electrolytic solution secondary battery,
- wherein the negative electrode contains a negative electrode active material having an initial charge/discharge efficiency of 75% or less when charged and discharged by employing metallic Li as a counter electrode, the negative electrode being obtained by charging with a positive electrode containing a metal oxide (X) represented by AxMeOy, wherein A is at least one or two species selected from Na and K, Me is at least one or two species selected from Ni and Cu, x satisfies 1.9≦x≦2.1, and y satisfies 1.9≦x≦2.1, as a counter electrode,
- the metal oxide (X) comprises Na2CuO2,
- the positive electrode includes a positive electrode active material (Z), and a content of the metal oxide (X) in the positive electrode is 2 to 15 wt % with respect to the total weight of the positive electrode active material (Z) and the metal oxide (X).
Dependencies are inferred from the claim text.