| 摘要 |
A lithium-ion battery anode layer, comprising an anode active material embedded in pores of a solid graphene foam composed of multiple pores and pore walls, wherein (a) the pore walls contain a pristine graphene material having essentially no (less than 0.01%) non-carbon elements or a non-pristine graphene material having 0.01% to 5% by weight of non-carbon elements; (b) the anode active material is in an amount from 0.5% to 95% by weight based on the total weight of the graphene foam and the anode active material combined, and (c) some of the multiple pores are lodged with particles of the anode active material and other pores are particle-free, and the graphene foam is sufficiently elastic to accommodate volume expansion and shrinkage of the particles of the anode active material during a battery charge-discharge cycle to avoid expansion of the anode layer. Preferably, the solid graphene foam has a density from 0.01 to 1.7 g/cm3, a specific surface area from 50 to 2,000 m2/g, a thermal conductivity of at least 100 W/mK per unit of specific gravity, and/or an electrical conductivity no less than 1,000 S/cm per unit of specific gravity. |
| 主权项 |
1. An anode or negative electrode layer for a lithium battery, said anode layer comprising multiple particles of an anode active material and a solid graphene foam composed of multiple pores and pore walls, wherein
a. said pore walls contain a pristine graphene material having less than 0.01% by weight of non-carbon elements or a non-pristine graphene material having 0.01% to 5% by weight of non-carbon elements, wherein said non-pristine graphene is selected from graphene oxide, reduced graphene oxide, graphene fluoride, graphene chloride, graphene bromide, graphene iodide, hydrogenated graphene, nitrogenated graphene, boron-doped graphene, nitrogen-doped graphene, chemically functionalized graphene, or a combination thereof; b. said anode active material is in an amount from 0.5% to 95% by weight based on the total weight of said graphene foam and said anode active material combined; and c. some of said multiple pores are lodged with said particles of the anode active material and other pores are particle-free, and said graphene foam is sufficiently elastic to accommodate volume expansion and shrinkage of said particles of the anode active material during a battery charge-discharge cycle to avoid expansion of said anode layer. |
