With the wide application of rechargeable (secondary) batteries in the field of energy, a rechargeable battery system with higher energy density and higher power density has become a research hotspot for researchers to pursue. 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 matching secondary battery high performance electrode material can achieve new high-performance energy storage and energy conversion The key to the goal.
In recent years, Ningbo materials owned by the new energy technology institute Han Weijiang researcher, Dr. Tian Huajun led the advanced lithium battery team, including high-energy density lithium-ion battery and magnesium ion batteries and other aspects of a series of progress. In the high-performance lithium-ion battery silicon-based anode materials, the development of a series of micron-grade porous silicon and silicon-carbon composite anode material. The first Coulomb efficiency of the porous silicon anode material developed by the research team reached 88.1%, and the circulation capacity was 100.0%. Related research has applied for Chinese invention patent (201510468107.3, 201610016711.7). The results of the series of silicon-based negative materials have been published in Journal of Materials Chemistry A (2015, 3, 17956-17962) and Nano Energy (2015, 11, 490-499).
Ningbo materials can be rechargeable electrode material series of progress Ningbo materials can be rechargeable electrode material series of progress
Fig.1 Morphology of micro-porous silicon anode materialFig.2 Initial charge-discharge curve of micron-sized porous silicon
And silicon with the main group of elements of germanium, at room temperature higher conductivity (104 times the silicon), while the theoretical specific capacity of germanium up to 1600mAh / g. The research team successfully prepared the germanium-based anode material with high magnification performance by means of industrial spray drying. The germanium-based negative electrode material can maintain a specific discharge capacity of 550 mAh / g even at a current density of 5 A / g. In this method, the three-dimensional network structure of GeOx / CNTs is formed by spray and spheres. It plays a very good electron transport function, greatly reduces the contact resistance of the battery electrode, reduces the polarization of the battery, and realizes the high magnification of the battery Charge and discharge characteristics. Related work is published in Journal of Materials Chemistry A (2015, 3, 19393-19401). Team research work has been invited to be reviewed in the Journal of Materiomics (2015, 1 (3), 153-169) based on a series of advances in the team's high capacity negative for lithium-ion batteries.