With the widespread application of rechargeable (secondary) batteries in the energy field, rechargeable battery systems with higher energy density and greater power density have become a research hotspot for researchers. In recent years, with the development of secondary batteries such as lithium-ion batteries, potassium-ion batteries, magnesium-ion batteries, and aluminum-ion batteries, the development of electrode materials that match the above-mentioned high performance of secondary batteries will become a new type of high-performance energy storage and energy conversion. The key to such goals.
In recent years, the Advanced Lithium Battery team led by Han Weiqiang and Tian Huajun of the New Energy Technology Institute of Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, has made progress in the areas of high energy density lithium-ion batteries and magnesium-ion batteries. In the field of high-performance lithium-ion battery silicon-based anode materials, a series of micron-sized porous silicon and silicon-carbon composite anode materials have been developed. The first Coulomb efficiency of the porous silicon anode material developed by the research team reached 88.1%, and the capacity retention rate of the cycle 100 times exceeded 99.0%. Related research has applied for Chinese invention patents (201510468107.3, 201610016711.7). The results of a series of silicon-based anode materials were published in the Journal of Materials Chemistry A (2015, 3, 17956-17962) and Nano Energy (2015, 11, 490–499) one after another. .
The elemental germanium, which shares the same family as silicon, has a higher conductivity at room temperature (104 times that of silicon), while the theoretical specific capacity of germanium is as high as 1600 mAh/g. The research team successfully prepared high-rate yttrium-based anode materials using industrial spray drying methods. The niobium-based anode material can maintain a discharge specific capacity of 550 mAh/g even at a current density of 5 A/g. In this method, a solid GeOx/CNTs three-dimensional network structure is formed by spray-balling, which plays a very good role in electron transmission, greatly reduces the contact resistance of the battery electrode, reduces the polarization of the battery, and achieves high battery magnification. Charge and discharge characteristics. Related work was published in Journal of Materials Chemistry A (2015, 3, 19393-19401). Based on the team's progress in lithium-ion battery high-capacity negative electrodes, the team research work has been invited as a review and published in the Journal of Materiomics (2015, 1(3), 153–169).
Magnesium ion batteries have received more and more attention from researchers because of their high safety, environmental friendliness and high volumetric specific capacity (3833 mAh/cm-3). However, magnesium ion batteries are faced with many problems, including: (1) How to develop an electrolyte system that can realize reversible magnesium ion deposition and dissolution, and overcome the problem that the magnesium surface in most solutions easily forms a passivation film and hinders magnesium ion transmission. (2) Magnesium ions have a high charge density and a strong polarization, and how to find a positive electrode material with excellent performance that can effectively intercalate magnesium ions. Based on the above series of questions, recently, Tian Huajun of the research team cooperated with Zhejiang University and the University of Maryland in the United States to obtain original research results in high-density magnesium ion batteries. Related work was received by Nature Communications magazine (2016, DOI: 10.1038/ncomms14083). The research work has developed an iodine-based cathode material that has a high operating voltage (2.0 V), a high specific capacity (~200 mAh/g), and good cycle performance (>120 cycles of charge and discharge) . At the same time, this work optimizes the magnesium-based electrolyte system and achieves reversible magnesium ion deposition and dissolution, with a Coulomb efficiency approaching 100%. This work deeply studied the reaction mechanism of the magnesium ion battery system, and used its unique mechanism of magnesium storage to overcome the disadvantages of magnesium ion's high charge density and difficulty in embedding cathode materials, which provided new for the development of new magnesium ion batteries. Methods and ideas.
The above research work has been supported by major scientific and technological innovation teams in Zhejiang Province, the 3315 International Innovation Team in Ningbo City, the National Natural Science Foundation of China, the National Natural Science Foundation of China, the Natural Science Foundation of Zhejiang Province, and the Natural Science Foundation of Ningbo City. stand by.
Second Punch,Second Punch Screw Header ,Second Punch For Screw,Phillips Screw Punch
Chongqing Henghui Precision Mold Co., Ltd , https://www.citool.com