Highly thermally conductive heat storage material, preparation method therefor, and application thereof, and composition for preparing highly thermally conductive heat storage material and application thereof

A composition for preparing a highly thermally conductive heat storage material, characterized in that, the composition comprises a graphite and a mesophase pitch;

• based on the total weight of the highly thermally conductive heat storage material composition, the graphite is present in an amount of 50 wt % to 85 wt %, and the mesophase pitch is present in an amount of 15 wt % to 50 wt %;
• wherein the mesophase pitch has a microcrystal size Lc in a c-axis direction, a microcrystal size La in an a-axis direction and an interlayer spacing d002 of the crystal plane (002) obtained by XRD meet the following conditions:
• Lc>2 nm, La>12 nm, d002<0.3580 nm;
• wherein the mesophase pitch has a mesophase content of 30 wt % to 100 wt %, and a softening point of 300° C. to 400° C.;
• wherein the graphite has a microcrystal size Lc in a c-axis direction, a microcrystal size La in an a-axis direction and an interlayer spacing d002 of the crystal plane (002) obtained by XRD meet the following conditions:
• Lc>50 nm, La>80 nm, d002<0.3358 nm.

A preparation method of a highly thermally conductive heat storage material, wherein, the preparation method comprises the following steps:

• (1) uniformly mixing components of the highly thermally conductive heat storage material composition to obtain a premix;
• (2) pressing the premix for pre-molding to obtain a pre-molded block;
• (3) subjecting the pre-molded block to hot press molding to obtain a molded sample;
• (4) subjecting the molded sample to heat treatment in an inert atmosphere to obtain the highly thermally conductive heat storage material;
• wherein, the composition comprises a graphite and a mesophase pitch;
• based on the total weight of the highly thermally conductive heat storage material composition, the graphite is present in an amount of 50 wt % to 85 wt %, and the mesophase pitch is present in an amount of 15 wt % to 50 wt %;
• wherein the mesophase pitch has a microcrystal size Lcin a c-axis direction, a microcrystal size La in an a-axis direction and an interlayer spacing d002 of the crystal plane (002) of obtained by XRD that meet the following conditions:
• Lc>2 nm, La>12 nm, d002<0.3580 nm;
• wherein the mesophase pitch has a mesophase content of 30wt % to 100 wt %, and a softening point of 300° C. to 400° C.;
• wherein the graphite has a microcrystal size Lc in a c-axis direction, a microcrystal size La in an a-axis direction and an interlayer spacing d002 of the crystal plane (002) obtained by XRD that meet the following conditions:
• Lc>50 nm, La>80 nm, d002<0.3358 nm.