The Help of "Sulfur Template Method" for Li-ion Batteries
In recent years, electronic products such as mobile phones and notebook computers have been developing towards lighter and thinner. Among them, the battery life of the secondary (rechargeable) battery remains the same or smaller, but the battery life is continuously improved. In addition, in the era of new energy vehicles, how to have a longer range of electricity in a limited body space is also a problem that needs to be solved. In order to make the next generation of lithium batteries lighter, the Tianjin University scientific team developed the "sulfur template method".
In response to the increasing demand, researchers have been working on the performance improvement 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 for researchers in the field of energy storage.
Recently, Professor Yang Quanhong from the School of Chemical Engineering of Tianjin University and his research team proposed a "sulfur template method". They finally completed the "tailor-made" of graphene encapsulation of active particles through the design of anode materials for high volume energy density lithium-ion batteries. Make it possible to make lithium-ion batteries "smaller".
재료의 특성 연구에서 연구원들은 리튬 이온 배터리가 이미 높은 에너지 밀도를 갖고 있지만{1} 주석 및 실리콘과 같은 비탄소 재료가 현재 상업용 흑연 및 리튬{2}}이온 배터리의 질량 에너지 밀도를 크게 향상시킵니다. 그러나 이 두 재료의 부피 팽창 문제는 응용과 개발을 제한합니다.
따라서 연구진은 개선된 탄소 나노 물질로 구성된 탄소 케이지 구조를 사용하여 이 문제를 해결했습니다. 그래핀 계면 어셈블리를 기반으로{0}정확하게 맞춤화된 조밀한 다공성 탄소 케이지를 위한 황 템플릿 기술을 발명했습니다.
In the process of constructing dense graphene networks using capillary evaporation techniques, the researchers introduced sulfur as a flowable volume template to complete the customization of graphene-carbon coats for non-carbon active particles. In the experiment, by modulating the amount of sulfur template used, they could precisely control the three-dimensional graphene-carbon cage structure to achieve a "fit" coating of the non-carbon active particles, so as to effectively buffer the huge non-carbon active particles caused by lithium intercalation. The volume expansion makes it exhibit excellent volume performance as a negative electrode for lithium ion batteries.
Through this research, Professor Yang Quanhong's research team successfully solved the bottleneck problem of high density and porosity of carbon materials, 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 generalized construction strategy for next-generation high-energy lithium-ion batteries and electrode materials such as lithium-sulfur batteries and lithium-air batteries. The energy storage battery is expected to achieve "small volume" and "high capacity", which greatly meets the needs of users' portability.
