Negative electrode material, battery, method for producing negative electrode material, and method for producing battery
AssigneeMitsubishi Materials Corporation
InventorsYoshinobu Nakada, Naoki Rikita, Jie Tang, Kun Zhang
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Abstract
Performance is improved. There is provided a negative electrode material for a battery, in which the negative electrode material includes carbon, sodium tungstate, and silicon particles 33 including silicon, and in the silicon particle 33, a ratio of the amount of Si in Si2p derived from elemental silicon to the amount of Si in Si2p derived from SiO2 in a surface layer when measured by X-ray photoelectron spectroscopy is 3 or more on an atomic concentration basis.
Claims11
A negative electrode material for a battery, comprising:
- carbon, sodium tungstate, and a silicon material including silicon,
- wherein, in the silicon material, a ratio of an amount of Si in Si2p derived from elemental silicon to an amount of Si in Si2p derived from SiO2 in a surface layer is 3 or more, on an atomic concentration basis, as measured by X-ray photoelectron spectroscopy.
A method for producing a negative electrode material for a battery, the method comprising:
- preparing a silicon raw material under an atmosphere having an oxygen concentration of 5% or less;
- and
- producing the negative electrode material including carbon, sodium tungstate, and a silicon material by using the silicon raw material,
- wherein, in the silicon material, a ratio of an amount of Si in Si2p derived from elemental silicon to an amount of Si in Si2p derived from SiO2 in a surface layer is 3 or more, on an atomic concentration basis, as measured by X-ray photoelectron spectroscopy.
Dependencies are inferred from the claim text.