Research on High Energy Density Nano Solid Metal Lithium Battery

　　In order to develop high-energy-density nano-solid-state metal lithium batteries and solve the cyclical and safety problems faced by metal lithium batteries, with the strong support of the Ministry of Science and Technology, the National Natural Science Foundation of China and the Chinese Academy of Sciences, the Institute of Chemistry The research team of Guo Yuguo, a researcher at the Key Laboratory of Nanotechnology Institute, has made a series of progress in the research of lithium metal anodes, solid electrolytes and solid-state batteries.

　　Photograph of the voltage of the soft pack battery after cutting. The LED device can be lit before (e) and after (f) the soft pack battery bend test.

　　In order to develop high-energy-density nano-solid-state metal lithium batteries and solve the cyclical and safety problems faced by metal lithium batteries, with the strong support of the Ministry of Science and Technology, the National Natural Science Foundation of China and the Chinese Academy of Sciences, the Institute of Chemistry The research team of Guo Yuguo, a researcher at the Key Laboratory of Nanotechnology Institute, has made a series of progress in the research of lithium metal anodes, solid electrolytes and solid-state batteries.

　　In recent years, the researchers of this research group have been committed to the related research of metal lithium anode for a long time. In the previous research work, in response to the uneven dissolution and deposition (ie dendrite) of the lithium metal anode during the charging and discharging process, they proposed the idea of using three-dimensional nano-current collectors to guide the uniform deposition and dissolution of lithium metal in the three-dimensional electrode. Successfully achieved the control of metallic lithium dendrites (Nat. Commun., 2015, 6, 8058). Researchers have proposed and developed an in-situ treatment technology to successfully form a lithium phosphate solid electrolyte interface film with high Young's modulus and fast lithium ion transport ability on the surface of metal lithium, which effectively reduces the side effects of metal lithium and electrolyte. Reaction to inhibit the growth of lithium dendrites

　　In order to solve the problems of dendritic growth and poor cycle stability in the high areal capacity lithium metal anode, the researchers used electrochemically active graphitized carbon fibers as a multifunctional three-dimensional current collector to obtain a metal with an areal capacity of up to 8mAhcm-2 and no dendrites. Lithium negative electrode. Since graphitized carbon fiber can reduce local current density and alleviate volume changes, the negative electrode exhibits high Coulomb efficiency, low voltage polarization and long cycle life during the cycle. The related results were recently published in Adv.Mater.(2017,29,1700389 )superior.

　　In the preliminary research work of electrolytes for metal lithium batteries, the research team designed a type of mixed electrolyte system of ether electrolyte plus ionic liquid to improve the irreversible degradation of SEI spontaneously formed on the surface of metal lithium during cycling. The deposition behavior and cycle stability of lithium metal anodes (Adv.Sci., 2017, 4, 1600400); the researchers proposed a functional electrolyte additive containing Al colloidal particles, which successfully deposited on the surface of lithium metal by adding AlCl3 to the electrolyte A uniform, stable and dense SEI film is formed in situ, which stabilizes the metal lithium/electrolyte interface (NanoEnergy, 2017, 36, 411).