Embodiments discloses herein relate to low-cost methods of producing a carbon foam through blending at least one carbon source with at least one solvent to form a mixture and heating the mixture at atmospheric pressure and in a non-oxidizing atmosphere to form a carbon foam. Given that the carbon foam is produced at atmospheric pressure, the methods disclosed herein may include a continuous process.

The present application discloses a composite graphite material and a method for preparing the same, a secondary battery, and an apparatus. The composite graphite material includes a core material and a coating layer that coats at least a portion of the surface of the core material, the core material including graphite, and the coating layer including a coating material containing a cyclic structure moiety, wherein the composite graphite material has a weight-loss rate of from 0.1% to 0.55% when the composite graphite material is heated in an atmosphere of an inert non-oxidative gas at a temperature rising from 40° C. to 800° C. The composite graphite material can enhance the gram capability and reduce the expansion rate of an electrode plate, and more preferably, can improve the cycle performance and kinetic performance of a battery as well.

The present application discloses a composite graphite material and a method for preparing the same, a secondary battery, and an apparatus. The composite graphite material includes a core material and a coating layer that coats at least a portion of the surface of the core material, the core material including graphite, and the coating layer including a coating material containing a cyclic structure moiety, wherein the composite graphite material has a weight-loss rate of from 0.1% to 0.55% when the composite graphite material is heated in an atmosphere of an inert non-oxidative gas at a temperature rising from 40° C. to 800° C. The composite graphite material can enhance the gram capability and reduce the expansion rate of an electrode plate, and more preferably, can improve the cycle performance and kinetic performance of a battery as well.

A composite negative electrode active material includes: a first carbon-based material; and a second carbon-based material on a surface of the first carbon-based material, wherein the first carbon-based material and the second carbon-based material have respective particle diameters that are different from each other.

A composite negative electrode active material includes: a first carbon-based material; and a second carbon-based material on a surface of the first carbon-based material, wherein the first carbon-based material and the second carbon-based material have respective particle diameters that are different from each other.

An embodiment relates to a multilayer graphite sheet with excellent electromagnetic shielding capability and thermal conductivity, and a manufacturing method therefor, wherein the multilayer graphite sheet has a multilayer structure of five or more layers in total and can be manufactured to have a thick thickness of 70 μm or more such that the electromagnetic shielding capability can be significantly improved. In addition, the multilayer graphite sheet is manufactured by graphitizing a hybrid laminate in which heterogeneous materials are mixed such that thermal conductivity and electromagnetic shielding capability can be simultaneously realized at a lower cost, thereby being useful as a thick film sheet which used in various applications such as home appliances and electric vehicles.

An embodiment relates to a multilayer graphite sheet with excellent electromagnetic shielding capability and thermal conductivity, and a manufacturing method therefor, wherein the multilayer graphite sheet has a multilayer structure of five or more layers in total and can be manufactured to have a thick thickness of 70 μm or more such that the electromagnetic shielding capability can be significantly improved. In addition, the multilayer graphite sheet is manufactured by graphitizing a hybrid laminate in which heterogeneous materials are mixed such that thermal conductivity and electromagnetic shielding capability can be simultaneously realized at a lower cost, thereby being useful as a thick film sheet which used in various applications such as home appliances and electric vehicles.

An artificial graphite and preparation method thereof, negative electrode plates, secondary batteries, battery modules, battery packs, and electrical device are provided. In some embodiments, the artificial graphite has a particle size of Dv5016 μm and an air oxidation peak temperature T.sub.peak of 830° C., wherein the air oxidation peak temperature T.sub.peak of artificial graphite refers to the highest peak temperature of a differential thermo-gravimetric analysis curve obtained when the artificial graphite is subjected to a thermo-gravimetric test having a weighing mass of 10±0.05 mg, with a purging gas of air, an airflow rate of 60 mL/min, and a heating rate of 5° C./min, in a test temperature range of 40° C. to 950° C. By the present application, the resulting secondary batteries have higher first-cycle Coulomb efficiency and longer cycle life under the premise of good fast charging performance.

An artificial graphite and preparation method thereof, negative electrode plates, secondary batteries, battery modules, battery packs, and electrical device are provided. In some embodiments, the artificial graphite has a particle size of Dv5016 μm and an air oxidation peak temperature T.sub.peak of 830° C., wherein the air oxidation peak temperature T.sub.peak of artificial graphite refers to the highest peak temperature of a differential thermo-gravimetric analysis curve obtained when the artificial graphite is subjected to a thermo-gravimetric test having a weighing mass of 10±0.05 mg, with a purging gas of air, an airflow rate of 60 mL/min, and a heating rate of 5° C./min, in a test temperature range of 40° C. to 950° C. By the present application, the resulting secondary batteries have higher first-cycle Coulomb efficiency and longer cycle life under the premise of good fast charging performance.

A method of forming graphite includes carbonizing an upgraded coal, to form a carbonized upgraded coal. The method also includes graphitizing the carbonized upgraded coal, to form the graphite.