Direct synthesis of lithium ion battery electrode materials using graphene treated raw materials as the reactant
View Patent ↗In one embodiment, a composition for use in making active materials for a lithium ion battery, the composition comprising a processed, homogenous mix of graphene-treated reactant, conductive material, and a Li and phosphate-based salt, the composition comprising a surface area of less than approximately 10 m 2 /g.
1. A method of forming an electrode for a lithium ion battery, the method comprising:
mechanically coating reactant with graphene by enabling friction contact between the graphene and the reactant;
treating the graphene-coated reactant with conducting material;
mixing the treated and graphene-coated reactant with a Li-based salt suspension to form a homogenous mix; and
processing the homogenous mix to form active material, the active material comprising a surface area of less than approximately 10 m 2 /g.
2. The method of claim 1 , further comprising adding auxiliary conductive material to the active material to obtain a slurry process state material, wherein the slurry process state material comprises a surface area of less than approximately 10 m 2 /g, the slurry process state material used to form the electrode.
3. The method of claim 1 , wherein the Li-based salt suspension is phosphate-based.
4. The method of claim 1 , wherein treating the graphene-coated reactant with conducting material comprises providing approximately equimolar conducting material-to-reactant to the graphene-coated reactant.
5. The method of claim 1 , wherein the conducting material comprises carbon black.
6. The method of claim 1 , wherein the homogenous mix of the treated and graphene-coated reactant with the Li-based salt suspension comprises less than thirty weight percent of water content in weight.
7. The method of claim 1 , wherein the homogenous mix of the treated and graphene-coated reactant with the Li-based salt suspension comprises approximately twenty weight percent of water content in weight.
8. The method of claim 1 , wherein the homogenous mix of the treated and graphene-coated reactant with the Li-based salt suspension comprises approximately eighteen weight percent of water content in weight.
9. The method of claim 1 , wherein mechanically coating the reactant with the graphene comprises chemically bonding at least partially the reactant and the graphene.
10. The method of claim 1 , wherein processing comprises heating, crushing, or grinding, or one or more different combinations of the same.
11. The method of claim 10 , wherein heating includes drying.
12. The method of claim 1 , wherein the reactant comprises a metal oxide.
13. The method of claim 1 , wherein the active material comprises a surface area of approximately 3.1 m 2 /g or approximately 6.7 m 2 /g.
14. The method of claim 1 , wherein the processed homogenous mix of the treated and graphene-coated reactant with the Li-based salt suspension comprises LiMPO 4 or its derivatives, where M comprises one or more first row transition metal elements.
15. The method of claim 1 , wherein the processed homogenous mix of the treated and graphene-coated reactant with the Li-based salt suspension comprises non-stoichiometric LiMPO 4 or its derivatives in the non-stoichiometric form, where M comprises one or more first row transition metal elements.