Graphite negative material for lithium-ion battery, method for preparing the same and lithium-ion battery
A graphite negative material for a lithium-ion battery includes a number of graphite layers parallel to each other. A number of channels are through the graphite layers. And the channels are capable of allowing lithium ions to pass therethrough freely. A method for preparing the graphite negative material and a lithium-ion battery including the graphite negative material are also provided.
1. A method for preparing a graphite negative material for an electrode of a lithium-ion battery, comprising:
loading a catalyst on the surface of a graphite material comprising a plurality of graphite layers to form a graphite material loaded with the catalyst;
forming a plurality of channels through the graphite layers of the graphite material loaded with the catalyst by reacting the graphite material loaded with the catalyst with a reaction gas, wherein the carbon carbons of the graphite material in contact with the catalyst are transformed to a gaseous product to be removed, the plurality of channels are capable of allowing lithium ions to pass therethrough freely, and a BET specific surface area of thus-obtained graphite negative material is in the range of 2.2- to 10.7 m2/g;
wherein the catalyst comprises at least one selected from a group consisting ofTi, Zr, V, Nb, Cr, Mo, W, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Gd, Na, K, Mg, Ca, Sr, Ba, Al, Ga, In, Sn, Sb, Bi and a compound thereof.
2. The method of claim 1 , wherein the graphite material comprises at least one selected from a group consisting of natural graphite, artificial graphite, graphitized meso-carbon microbead and modified graphite.
3. The method of claim 1 , wherein the catalyst comprises at least one selected from a group consisting of Ti, Zr, V, Nb, Cr, Mo, W, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Gd and a compound thereof.
4. The method of claim 1 , wherein the catalyst comprises at least one selected from a group consisting of Mn, Fe, V, Zn, Co, Cu, Ni and a compound thereof.
5. The method of claim 1 , wherein the compound is at least one selected from a group consisting of oxide, hydroxide, halide, nitrate, sulfate, carbonate, metallic acid salt and organic acid salt.
6. The method of claim 1 , wherein a catalyst loading quantity is in a range from 0.010% to 40%.
7. The method of claim 1 , wherein a catalyst loading quantity is in a range from 0.10% to 20%.
8. The method of claim 1 , wherein a catalyst loading quantity is in a range from 0.50% to 10%.
9. The method of claim 1 , wherein a grain diameter of the particles of the catalyst is in a range from 0.2 nm to 1.5 μm.
10. The method of claim 1 , wherein the reaction gas is at least one selected from a group consisting of CO 2 , H 2 O, H 2 , N 2 O, NO and NO 2 .
11. The method of claim 1 , wherein a reaction temperature of reacting the graphite material loading the catalyst with a reaction gas is in a range from 500° C. to 1500° C.
12. The method of claim 1 , wherein a reaction temperature of reacting the graphite material loading the catalyst with a reaction gas is in a range from 700° C. to 1200° C.
13. The method of claim 1 , wherein a reaction period of reacting the graphite material loading the catalyst with a reaction gas is in a range from 0.5 hours to 50 hours.