"Sulfur Template Method" makes it possible to make lithium-ion batteries lighter

Professor Yang quanhong of the Institute of Chemical Engineering of Tianjin University and his research team finally completed the "tailor" of graphene wrapped in active particles through the design of high-volume energy density lithium ion battery negative electrode materials, making lithium ion batteries "smaller". Become possible.

In recent years, electronic products such as mobile phones and laptops have been moving toward lighter and thinner. Among them, secondary(rechargeable) batteries have maintained their size or smaller, but their endurance has required continuous improvement. In addition, in the era of new energy vehicles, how to have a longer range of power in the limited body space is also a problem. In order to make the next generation of lithium batteries lighter, the scientific team of Tianjin University has developed a "sulfur template method."

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 because of the lower density of nanomaterials, "smaller" has become a problem for researchers in the field of energy storage.

Recently, Professor Yang quanhong of the Institute of Chemical Engineering of Tianjin University and his research team proposed a "sulfur template method". They finally completed the "tailoring of graphene to active particles" by designing a negative electrode material for high-volume energy density lithium-ion batteries. Make it possible for lithium-ion batteries to be "smaller".

In the study of the properties of materials, researchers have found that although lithium-ion batteries already have a high energy density, non-carbon materials such as tin and Silicon are expected to replace commercial graphite and significantly increase the mass energy density of lithium-ion batteries. However, the volumetric expansion of these two materials limits their own application and development.

So the researchers solved this problem by using an improved carbon cage structure made of carbon nanomaterials. Based on graphene interface assembly, they developed a sulfur template technology that accurately customizes dense porous carbon cages.

In the process of constructing a dense graphene network using capillary evaporation, the researchers introduced sulfur as a flowable volume template and customized graphene carbon coats for non-carbon activated particles. In the experiment, by modulating the use of sulfur templates, they can accurately regulate the three-dimensional graphene carbon cage structure to achieve a "fit" envelope of the size of non-carbon activated particles, thus effectively cushioning the huge volume caused by the inclusion of lithium in non-carbon activated particles. Expansion, as a negative electrode of lithium-ion battery, it has excellent volumetric performance.

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