Porous carbon material and preparation method thereof, and silicon-carbon material and application thereof
AssigneeNingde Amperex Technology Limited
InventorXianghuan LIU
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Abstract
A porous carbon material, a method of preparing the porous carbon material, and a silicon-carbon material comprising the porous carbon material are provided. When a button cell assembled from the porous carbon material and lithium metal is charged at a current of 0.05C within a voltage range of 0.005 V to 2 V, a specific charge capacity within a voltage range of 0.005 V to 0.15 V is 43 mAh/g to 132 mAh/g, and a specific charge capacity within a voltage range of 0.005 V to 0.8 V is 152 mAh/g to 253.4 mAh/g; where a differential voltage-capacity dQ/dV curve of the porous carbon material has a first characteristic peak located at 0.005-0.15 V, and a peak height is not less than 260 mAh/g/V.
Claims20
A porous carbon material, wherein a specific charge capacity within a voltage range of 0.005 V to 0.15 V of the porous carbon material is Q1, Q1 is in the range of 43 mAh/g to 132 mAh/g, and a specific charge capacity within a voltage range of 0.005 V to 0.8 V of the porous carbon material is Q2, Q2 is in the range of 152 mAh/g to 253.4 mAh/g;
- a differential voltage-capacity dQ/dV curve of the porous carbon material has a first characteristic peak located in the range of 0.005 to 0.15 V, and a peak height of the first characteristic peak is not less than 260 mAh/g/V,
- wherein a test method of Q1, Q2 and the differential voltage-capacity dQ/dV curve of the porous carbon material includes:
- assembling the porous carbon material and lithium metal into a button cell, and then charging the button cell at a current of 0.05C within a voltage range of 0.005 V to 2 V.
A silicon-carbon material, wherein the silicon-carbon material comprises a porous carbon material, nano-silicon located inside the porous carbon material, and a carbon layer located on a surface of the porous carbon material;
- wherein
- wherein a specific charge capacity within a voltage range of 0.005 V to 0.15 V of the porous carbon material is Q1, Q1 is in the range of 43 mAh/g to 132 mAh/g, and a specific charge capacity within a voltage range of 0.005 V to 0.8 V of the porous carbon material is Q2, Q2 is in the range of 152 mAh/g to 253.4 mAh/g;
- a differential voltage-capacity dQ/dV curve of the porous carbon material has a first characteristic peak located in the range of 0.005 to 0.15 V, and a peak height of the first characteristic peak is not less than 260 mAh/g/V,
- wherein a test method of Q1, Q2 and the differential voltage-capacity dQ/dV curve of the porous carbon material includes:
- assembling the porous carbon material and lithium metal into a button cell, and then charging the button cell at a current of 0.05C within a voltage range of 0.005 V to 2 V.
An electronic apparatus, comprising a secondary battery;
- wherein the secondary battery comprises a positive electrode, a negative electrode, and an electrolyte, wherein the negative electrode comprises a negative electrode current collector and a negative electrode material layer located on at least a part of a surface of the negative electrode current collector, and the negative electrode material layer comprises a silicon-carbon material;
- wherein the silicon-carbon material comprises a porous carbon material, nano-silicon located inside the porous carbon material, and a carbon layer located on a surface of the porous carbon material;
- wherein
- wherein a specific charge capacity within a voltage range of 0.005 V to 0.15 V of the porous carbon material is Q1, Q1 is in the range of 43 mAh/g to 132 mAh/g, and a specific charge capacity within a voltage range of 0.005 V to 0.8 V of the porous carbon material is Q2, Q2 is in the range of 152 mAh/g to 253.4 mAh/g;
- a differential voltage-capacity dQ/dV curve of the porous carbon material has a first characteristic peak located in the range of 0.005 to 0.15 V, and a peak height of the first characteristic peak is not less than 260 mAh/g/V,
- wherein a test method of Q1, Q2 and the differential voltage-capacity dQ/dV curve of the porous carbon material includes:
- assembling the porous carbon material and lithium metal into a button cell, and then charging the button cell at a current of 0.05C within a voltage range of 0.005 V to 2 V.
Dependencies are inferred from the claim text.