Lithium-ion has been attracting worldwide attention since its introduction in 1991 and is widely used in the 3C field (communications, computer field, consumer electronics). However, the problems to be solved, such as limited energy density, power density and potential safety issues, limit the development of lithium-ion batteries. The flammable and explosive organic electrolyte is the key factor that causes the safety problem of lithium-ion battery. Many safety accidents are caused by the fire of lithium-ion battery electrolyte, such as the safety accident of Boeing 787 aircraft and the fire accident of power vehicle. Therefore, to replace the existing commercial electrolyte, solid-state batteries with solid electrolyte is the fundamental way to solve the safety problem of lithium-ion batteries. Under the guidance of Professor Pan Feng, under the guidance of Prof. Pan Feng, 2014 graduate student Tan Rui conducted interdisciplinary and collaborative innovation research and development with the college's postdoctoral fellow students and engineers to develop new all-solid-state battery designs and related materials synthesis, and actively and experimentally For the first time, experienced graduate students and postdocs work together to significantly increase the capacity (250mAh / g) of our high-capacity Li2FeSiO4 cathode material compared with our commonly used lithium cobalt oxide and 3-element materials (150mAh / g) Cathode material, used in polyoxyethylene all solid batteries. The battery has excellent rate performance (67.5mAh / g at 30 C) and high specific capacity (258.2 mAh / g at 1C) at 100 ℃, which is expected to be widely used as a battery for electric vehicles at higher temperatures . The work was published in a newsletter by Nano Energy (SCI Impact Factor 10.3), the world's leading magazine for nanomaterials and new energy. In this research work, for the first time, an all-solid-state battery based on lithium iron silicate (Li2FeSiO4) was assembled. The battery has a high specific capacity of 258.2 mAh g-1 at 1C and a capacity of 67.5 mAh g-1 at a high current of 30C. The high capacity and excellent rate performance are due to the Li4SiO4 lithium ion diffusion rate and electronic conductivity increased from 300K to 373K increased nearly 4 orders of magnitude. Tan Rui students and postdocs Yang Jinlong and Zheng Jiaxin (three are article co-author), with the support of other college students and engineers, completed the first year of graduate work, which is the North University of New Materials 2014 The first scholarly scholarly scholar who published the first author is also the first post-graduate student to publish it in the first international magazine. This is a very good motivation for all the students in Beida New Material Institute. At present, the graduate students from the New Material Institute of Shenzhen Research Institute are working hard and working together to form original patents for more outstanding research results and to invest in high-impact scientific journals. At the same time, all teachers and students of the college are actively responding to the call of Peking University to create a world-class university and make concerted efforts to build the new material institute into a world-class material science and engineering institute. (A) Schematic diagram of work based on carbon-coated lithium iron silicate and organic polymer electrolyte (PEO-Al2O3-LiTFSI). (B) Cathode-electrolyte cross-section elemental energy spectra of the cell without electrochemical activation and high temperature treatment. (C) Cathode-electrolyte cross-sectional elemental energy spectra of the cell after electrochemical activation and high temperature treatment. (Blue for sulfur, yellow for silicon) (d) polyoxyalkylene chain and lithium salt (LiTFSI) single particle diagram of lithium iron silicate encapsulated.
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