In response to the increasing demand, researchers have been working on improving the performance of secondary batteries. They found that nanotechnology can make batteries "lighter" and "faster", but due to the lower density of nanomaterials, "smaller" has become a problem facing researchers in the field of energy storage.

　　Recently, Professor Yang Quanhong and his research team from the School of Chemical Engineering and Technology of Tianjin University proposed a "sulfur template method". Through the design of anode materials for high-volume energy density lithium-ion batteries, they finally completed the "tailor-made" coating of active particles by graphene. Make lithium-ion batteries "smaller" possible.

　　In the study of the properties of materials, researchers have found that although lithium-ion batteries have high energy density, non-carbon materials such as tin and silicon are expected to replace current commercial graphite and greatly increase the quality and energy density of lithium-ion batteries. However, the volume expansion of these two materials limits their own application and development.

　　So the researchers solved this problem by using a carbon cage structure constructed with improved carbon nanomaterials. Based on the graphene interface assembly, they invented a sulfur template technology that precisely tailors the dense porous carbon cage.

　　In the process of using capillary evaporation technology to build a dense graphene network, the researchers introduced sulfur as a flowable volume template to customize the graphene carbon coat for non-carbon active particles. In the experiment, by modulating the amount of sulfur template used, they can precisely control the three-dimensional graphene carbon cage structure to achieve a "fitting" coating of the size of non-carbon active particles, thereby effectively buffering the huge amount of lithium intercalation caused by non-carbon active particles. The volume expansion makes it exhibit excellent volume performance as a lithium-ion battery negative electrode.

　　Through this research, Professor Yang Quanhong's research team successfully solved the bottleneck problem of high density and porosity of carbon materials, which are "not compatible with both fish and bear's paws", and obtained high-density porous carbon materials.

　　It is worth pointing out that this "tailor-made" design idea of carbon cage structure based on graphene assembly can be extended to a universally applicable next-generation high-energy lithium-ion battery, lithium-sulfur battery, lithium-air battery and other electrode materials construction strategies. The energy storage battery is expected to achieve "small size" and "high capacity", which greatly meets the needs of users for portability.