Heat accumulation and energy storage graphite material for solar thermal power generation and preparation method thereof

The invention relates to a heat accumulation and energy storage graphite material for solar thermal power generation and a preparation method thereof. The performance parameters of the graphite material meet the following requirements that: volume density is more than or equal to 1.75 g/cm ; electrical resistivity is less than or equal to 7.5 mu ohm m; ash content is less than or equal to 0.2 percent; rupture strength is more than or equal to 18.5 Mpa; elastic modulus is less than or equal to 8.8 Gpa; and thermal expansion coefficient is less than or equal to 2.0*10 /DEG C . The graphite material of the invention has the advantages of high thermal capacity, high heat conductivity, long service life, low cost and the like. In the preparation method, the focusing solar thermal power generation and heat accumulating material is prepared from raw materials by the steps of sieving, burdening, kneading, airing, vibration molding, baking, soaking, secondary baking, graphitizing and machining.