Method for producing anode paste for lithium-ion battery

A method for producing an anode slurry for a lithium-ion battery, comprising the steps of:

• (1) introducing a composition (C) comprising an active component that includes a phase of silicon or phases of silicon oxides, SiOx, where x is a positive number less than or equal to 2, or a combination of such phases with a total atomic ratio of oxygen:silicon contents in the combination of the phases of more than 0 and less than 1.8, into a liquid-phase suspension (S) comprising 0.01 wt. % to 5 wt. % of carbon nanotubes, wherein more than 5 wt. % of carbon nanotubes of the total carbon nanotubes in the suspension (S) are bundled single-walled and/or double-walled carbon nanotubes with a bundle length of more than 10 μm, and wherein a mode of hydrodynamic diameter distribution of the number of bundles of carbon nanotubes in the suspension (S) is less than 500 nm, and
• (2) mixing the mixture of the composition (C) in the suspension (S) until a homogeneous anode slurry is obtained,
• wherein, after step (2), dry matter of the homogeneous anode slurry includes more than 50 wt. % and less than 99.9 wt. % of the active component, and
• wherein a total atomic ratio of oxygen:silicon contents in the dry matter of the homogeneous anode slurry is more than 0 and less than 1.8, and
• wherein the dry matter of the homogeneous anode slurry includes more than 0.1 wt. % and less than 20 wt. % of carbon nanotubes.

An anode slurry for a lithium-ion battery, comprising:

• (1) an active component that includes a phase of silicon or phases of silicon oxides, SiOx, where x is a positive number less than or equal to 2, or a combination of such phases with a total atomic ratio of oxygen:silicon contents in the combination of the phases of more than 0 and less than 1.8, and
• (2) carbon nanotubes,
• wherein more than 5 wt. % of carbon nanotubes of the total carbon nanotubes in the anode slurry are bundled single-walled and/or double-walled carbon nanotubes with a bundle length of more than 10 μm, and
• wherein a mode of bundle length distribution of the number of bundles of carbon nanotubes in the anode slurry is less than 5 μm,
• and wherein the dry matter of the anode slurry includes more than 50 wt. % and less than 99.9 wt. % of the active component,
• wherein a total atomic ratio of oxygen:silicon contents in the dry matter of the anode slurry is more than 0 and less than 1.8, and
• wherein the dry matter of the anode slurry includes more than 0.1 wt. % and less than 20 wt. % of carbon nanotubes.

A method of producing an anode for a lithium-ion battery, comprising:

• (1) introducing a composition (C) comprising an active component that includes a phase of silicon or phases of silicon oxides, SiOx, where x is a positive number less than or equal to 2, or a combination of such phases with a total atomic ratio of oxygen:silicon contents in the combination of the phases of more than 0 and less than 1.8, into a liquid-phase suspension (S) comprising 0.01 wt. % to 5 wt. % of carbon nanotubes, wherein more than 5 wt. % of carbon nanotubes of the total carbon nanotubes in the suspension (S) are bundled single-walled and/or double-walled carbon nanotubes with a bundle length of more than 10 μm, and wherein a mode of hydrodynamic diameter distribution of the number of bundles of carbon nanotubes in the suspension (S) is less than 500 nm, and
• (2) mixing the mixture of the composition (C) in the suspension (S) until a homogeneous anode slurry is obtained,
• wherein, after step (2), dry matter of the homogeneous anode slurry includes more than 50 wt. % and less than 99.9 wt. % of the active component,
• wherein a total atomic ratio of oxygen:silicon contents in the dry matter of the homogeneous anode slurry is more than 0 and less than 1.8, and
• wherein the dry matter of the homogeneous anode slurry includes more than 0.1 wt. % and less than 20 wt. % of carbon nanotubes, (3) applying the homogeneous anode slurry on a current collector of a lithium-ion battery;
• (4) drying the applied homogeneous anode slurry to form an anode of the lithium-ion battery;
• and
• (5) compacting the anode.

An anode for a lithium-ion battery comprising:

• (1) a current collector;
• (2) an active component that includes a phase of silicon or phases of silicon oxides, SiOx, where x is a positive number less than or equal to 2, or a combination of such phases with a total atomic ratio of oxygen:silicon contents in the combination of the phases of more than 0 and less than 1.8, and
• (3) carbon nanotubes,
• wherein more than 5 wt. % of carbon nanotubes of the total carbon nanotubes in the anode are bundled single-walled and/or double-walled carbon nanotubes with a bundle length of more than 10 μm,
• wherein a mode of bundle length distribution of the number of bundles of carbon nanotubes in the anode is less than 5 μm,
• wherein the active component makes up more than 50 wt. % and less than 99.9 wt. % of the weight of the anode excluding current collector,
• wherein a total atomic ratio of oxygen:silicon contents in the anode is more than 0 and less than 1.8, and
• wherein the carbon nanotubes make up more than 0.1 wt. % and less than 20 wt. % of the weight of the anode excluding current collector.