ã€ALUMINIUM CHINA NETWORK】 Recently, researcher Tang Yongbing of the Functional Film Materials Research Center of the Institute of Advanced Technology, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences and his research team have made breakthroughs in the research of low-cost, high-performance energy storage batteries. Related research results "Carbon-Coated Porous Aluminum Foil Anode for High-Rate, Long-Term Cycling Stability and High Energy Density Dual-Ion Batteries (High-rate, long-cycle, high-energy density double-ion battery based on carbon-coated porous aluminum foil cathode )" was published online in the Advanced Materials Journal and applied for one international invention patent.
In March this year, the team released a new aluminum-graphite dual-ion battery technology at the famous Advanced Energy Materials. This technology has received immediate attention from international and domestic media and its counterparts. Its working principle is different from the existing traditional lithium battery, and the cheap graphite is used as the positive electrode, and the aluminum foil is used as the negative electrode and the current collector at the same time. Compared with conventional lithium batteries, this new battery technology has the advantages of low cost, high operating voltage, good safety, and high energy density. However, the cycle stability of the battery technology still needs to be improved. In particular, there is a need to improve the volume change of the aluminum foil negative electrode during charge and discharge.
Based on the above considerations, Professor Tang Yongbing and his team members, together with Xue Feng, Zhang Fan, and others, constructed a novel carbon-coated porous aluminum composite negative electrode material through a simple and controllable method. Tests have proved that this new type of porous aluminum foil/carbon composite negative electrode can significantly improve the overall performance of aluminum-graphite double-ion batteries, in particular, the cycle stability has been greatly improved. The cycle performance test found that the capacity retention rate of the battery is as high as -90% after 1000 times of charge and discharge cycles at a high rate of 2C (charging/discharging time is about 30 minutes), which is much higher than the current national standard (GB/T). The requirements for the cycle life of the mobile phone battery are found, and it is found that the battery also has excellent rate characteristics. When the battery is fully charged within 3 minutes, its mass energy density is as high as 200 Wh/kg, which is about twice that of the conventional lithium ion battery. The experiment confirmed that this new type of porous aluminum foil/carbon composite negative electrode can effectively relieve the volume expansion effect of the aluminum foil and lithium ion alloying process due to its three-dimensional porous conductive network, and can significantly increase the mobility of lithium ions, thus enabling the battery to have Fast charge and fast release characteristics; while the carbon coating helps to form a stable solid electrolyte (SEI) film while mitigating the volume change effect, thereby further improving the cycle life of the battery. The research results will facilitate the application of new aluminum-graphite dual-ion battery technology in new energy vehicles and portable electronic products.
The study was funded by Guangdong Provincial Innovation Research Team, Guangdong Science and Technology Plan Project, Shenzhen Science and Technology Plan Project and National Natural Science Fund.
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