Negative-electrode active material for sodium-ion secondary battery, method for manufacturing said negative-electrode active material, and sodium-ion secondary battery
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsAkira Kano, Nobuhiko Hojo, Masahisa Fujimoto
Life of this patent
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Abstract
A negative-electrode active material for a sodium-ion secondary battery contains a porous carbon material which has a plurality of open pores that extend through to the surface, a plurality of closed pores that do not extend through to the surface, and a solid portion made of carbon material. The distance between (002) planes of carbon in at least a part of the solid portion is 0.36 nm or more. The plurality of closed pores account for a volume ratio of not less than 30% and not more than 90% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion.
Claims21
A negative-electrode active material for a sodium-ion secondary battery, comprising a porous carbon material having a plurality of open pores that extend through to a surface, a plurality of closed pores that do not extend through to the surface, and a solid portion made of carbon material, wherein,
- a distance between (002) planes of carbon in at least a part of the solid portion is not less than 0.36 nm and not more than 0.41 nm;
- and
- the plurality of closed pores account for a volume ratio of not less than 30% and not more than 90% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion.
A method of producing a negative-electrode active substance for a sodium-ion secondary battery, comprising:
- a step of providing an organic material to serve as a carbon source;
- and
- a step of subjecting the organic material to a heat treatment in an inert atmosphere to obtain a porous carbon material, wherein,
- the organic material is a cellulose-type resin;
- the porous carbon material has a plurality of open pores that extend through to a surface, a plurality of closed pores that do not extend through to the surface, and a solid portion made of carbon material;
- a distance between (002) planes of carbon in at least a part of the solid portion is not less than 0.36 nm and not more than 0.41 nm;
- and
- the plurality of closed pores account for a volume ratio of not less than 30% and not more than 90% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion.
A method of producing a negative-electrode active substance for a sodium-ion secondary battery, comprising:
- a step of providing an organic material to serve as a carbon source;
- a step of pulverizing the organic material in a mortar;
- and
- a step of subjecting the pulverized organic material to a heat treatment in an inert atmosphere to obtain a porous carbon material, wherein,
- the organic material is phenolphthalein;
- the porous carbon material has a plurality of open pores that extend through to a surface, a plurality of closed pores that do not extend through to the surface, and a solid portion made of carbon material;
- a distance between (002) planes of carbon in at least a part of the solid portion is not less than 0.36 nm and not more than 0.41 nm;
- and
- the plurality of closed pores account for a volume ratio of not less than 30% and not more than 90% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion.
A method of producing a negative-electrode active substance for a sodium-ion secondary battery, comprising:
- a step of providing a carbon material having porosity;
- and
- a step of subjecting the carbon material having porosity to a heat treatment in an inert atmosphere to obtain a porous carbon material, wherein,
- the carbon material having porosity is an activated carbon material;
- the porous carbon material has a plurality of open pores that extend through to a surface, a plurality of closed pores that do not extend through to the surface, and a solid portion made of carbon material;
- a distance between (002) planes of carbon in at least a part of the solid portion is not less than 0.36 nm and not more than 0.41 nm;
- and
- the plurality of closed pores account for a volume ratio of not less than 30% and not more than 90% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion.
A method of producing a negative-electrode active substance for a sodium-ion secondary battery, comprising:
- a step of providing a carbon material having porosity;
- and
- a step of subjecting the carbon material having porosity to a heat treatment in an inert atmosphere to obtain a porous carbon material, wherein,
- the carbon material having porosity is a template carbon material;
- the porous carbon material has a plurality of open pores that extend through to a surface, a plurality of closed pores that do not extend through to the surface, and a solid portion made of carbon material;
- a distance between (002) planes of carbon in at least a part of the solid portion is not less than 0.36 nm and not more than 0.41 nm;
- and
- the plurality of closed pores account for a volume ratio of not less than 30% and not more than 90% with respect to a total volume of the plurality of open pores, the plurality of closed pores, and the solid portion.
Dependencies are inferred from the claim text.