AG13 battery

　　Scientists make breakthrough in AG13 battery, batteries may become smaller

　　How can mobile phones, laptops and other consumer electronics be made lighter and thinner? How can electric vehicles have a longer range of power in a limited body space? As people's demand for energy storage becomes increasingly strong, the performance of secondary batteries also increases. Higher and higher demands were made. Nanotechnology can make batteries lighter and faster, but due to the low density of nanomaterials, smaller batteries have become a problem for researchers in the field of energy storage.

　　The research team of Professor Yang Quanhong, winner of the National Science Fund for Outstanding Youth and School of Chemical Engineering of Tianjin University, proposed the sulfur template method. Through the design of negative electrode materials for high volume energy density AG13 battery, they finally completed the tailor-made wrapping of active particles with graphene, making AG13 battery Getting smaller becomes possible. The results were published online in "Nature Communicators" on January 26.

　　As the most widely used secondary battery today, AG13 battery have high energy density. Non-carbon materials such as tin and silicon are expected to replace current commercial graphite as a new generation of anode materials and significantly increase the mass energy density (Whkg-1) of AG13 battery. However, their huge volume expansion severely limits the use of their volume performance advantages. The carbon cage structure constructed of carbon nanomaterials is considered to be the main means to solve the problem of huge volume expansion when non-carbon anode materials are intercalated with lithium; however, in the construction process of the carbon buffer network, too much reserved space is often introduced, resulting in the deterioration of the electrode material. The density is greatly reduced, which limits the volume performance of the negative electrode of AG13 battery. Therefore, the precise customization of the carbon cage structure is not only an important academic problem, but also the only way to industrialize new high-performance anode materials.

　　Professor Yang Quanhong's research team teamed up with collaborators from Tsinghua University, the National Nanocenter and the National Institute of Materials Science and Technology of Japan to make a breakthrough in the design of negative electrode materials for high volume energy density AG13 battery. Based on graphene interface assembly, they invented the precise customization of dense porous carbon cages. sulfur template technology. In the process of building a dense graphene network using capillary evaporation technology, they introduced sulfur as a flowable volume template to complete the customization of the graphene carbon coat for non-carbon active particles. By modulating the amount of sulfur template used, the three-dimensional graphene carbon cage structure can be precisely controlled to achieve suitable coating of non-carbon active particles, thereby effectively buffering the huge volume expansion of lithium-embedded non-carbon active particles as a lithium-ion battery. The negative electrode exhibits excellent volumetric performance.

　　Precise design of graphene carbon cage structure using graph sulfur template method

　　The sulfur template method was proposed by cleverly utilizing sulfur's transformer-like fluidity, amorphous shape, and ease of removal in a three-dimensional graphene dense network to realize the treatment of non-carbon active particles such as tin dioxide inside the carbon cage structure. Tight encapsulation of nanoparticles. Compared with traditional shape templates, the biggest advantage of sulfur templates is that they can function as plastic volume templates, so that the compact graphene cage structure can provide a conformable and precisely controllable reserved space, ultimately completing the process of designing active secondary Tailor-made tin oxide. This carbon-non-carbon composite electrode material with appropriate reserved space and high density can contribute extremely high volume specific capacity, thus greatly increasing the volumetric energy density of AG13 battery and making AG13 battery smaller. This tailor-made design idea can be expanded into a universal construction strategy for next-generation high-energy AG13 battery and electrode materials such as lithium-sulfur batteries and lithium-air batteries.

　　Professor Yang Quanhong's research team has made a series of important progress in the field of dense energy storage that emphasizes device volume performance in recent years. It invented the capillary evaporation densification strategy of graphene gel and solved the problem of high density and porosity of carbon materials. To overcome the bottleneck problem of both, obtain high-density porous carbon materials; pursue the small volume and high capacity of energy storage devices, and propose the design of high volume energy density energy storage devices from five aspects: strategy, method, material, electrode, and device. principles, and finally realized the construction of high-volume capacity energy storage materials, electrodes, and devices from supercapacitors, sodium-ion capacitors, lithium-sulfur batteries, lithium-air batteries to AG13 battery, laying the foundation for the practical use of carbon nanomaterials and vigorously promoting The practical progress of new electrochemical energy storage devices based on carbon nanomaterials.

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