Cathode material for lithium secondary battery and method for producing lithiated nickel dioxide and lithium secondary battery
First Claim
1. A cathode material for a lithium secondary battery comprising lithiated nickel dioxide having an α
- -NaFeO2 structure before a first charging/discharging cycle of the battery and maintaining the α
-NaFeO2 structure after the first charging/discharging cycle, and the cathode material having a first charging/discharging coulomb efficiency of at least 85% contributed by the α
-NaFeO2 structure.
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Abstract
The invention provides a cathode material for lithium secondary battery containing lithiated nickel dioxide having excellent charge/discharge characteristics and a process for producing the lithiated nickel dioxide, and a lithium secondary battery. That is, the cathode material for lithium secondary battery contains lithiated nickel dioxide having α-NaFeO2 structure and shows a coulomb efficiency of 85% or higher at the first charging and discharging, and the process for producing lithiated nickel dioxide comprises dispersing a nickel compound in a lithium nitrate solution, then evaporating the solvent to obtain a mixture of lithium nitrate and the nickel compound and firing the mixture in an atmosphere containing oxygen.
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Citations
4 Claims
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1. A cathode material for a lithium secondary battery comprising lithiated nickel dioxide having an α
- -NaFeO2 structure before a first charging/discharging cycle of the battery and maintaining the α
-NaFeO2 structure after the first charging/discharging cycle, and the cathode material having a first charging/discharging coulomb efficiency of at least 85% contributed by the α
-NaFeO2 structure.
- -NaFeO2 structure before a first charging/discharging cycle of the battery and maintaining the α
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2. A cathode material for a lithium secondary battery consisting essentially of lithiated nickel dioxide having an α
- -NaFeO2 structure, said α
-NaFeO2 structure being maintained between a maximum voltage of 4.2V and a minimum voltage of 2.5V, the cathode material having a first charging and discharging coulomb efficiency of at least 85%.
- -NaFeO2 structure, said α
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3. A lithium secondary battery, comprising an anode of a material comprising lithium metal, a lithium alloy or a material in which lithium can be doped and undoped, a cathode comprising lithiated nickel dioxide having an α
- -NaFeO2 structure before a first charging/discharging cycle of the battery and maintaining the α
-NaFeO2 structure after the first charging/discharging cycle in which lithium ion can be doped and from which lithium ion can be undoped, and a liquid or solid electrolyte, the cathode material having a first charging/discharging coulomb efficiency of at least 85% contributed by the α
-NaFeO2 structure.
- -NaFeO2 structure before a first charging/discharging cycle of the battery and maintaining the α
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4. A lithium secondary battery, comprising an anode of a material comprising lithium metal, a lithium alloy or a material in which lithium can be doped and undoped, a cathode consisting essentially of lithiated nickel dioxide having an α
- -NaFeO2 structure in which lithium ion can be doped and from which lithium ion can be undoped, said α
-NaFeO2 structure being maintained between a maximum voltage of 4.2V and a minimum voltage of 2.5V, and a liquid or solid electrolyte, the cathode material having a first charging and discharging coulomb efficiency of at least 85%.
- -NaFeO2 structure in which lithium ion can be doped and from which lithium ion can be undoped, said α
Specification