[Lecture] Lithium Battery Fast Charging Design Principle and Lithium Plating Detection Technology

Speaker: Yan Chong (Beijing Institute of Technology)

Date: April 28, 2024 (Sunday)

Time: 8:30-10:00 a. m.

Venue: Room 533, Building of Science and Technology

Report Introduction: The development of ultra-fast charging technology (XFC) is a core technology for the high-quality development of batteries. Currently, lithium-ion batteries with carbon anode materials face significant challenges during fast charging, as the theory of fast charging for carbon anode materials is not well-established, and the warning methods and technologies for lithium plating under ultra-fast charging conditions are not yet fully developed.

The presenter approaches from two aspects: the design principle of fast charging and the detection of lithium plating, systematically studying the charge transfer kinetics under the interaction of ternary cathode and carbon anode, and analyzing the kinetic properties of the positive and negative electrodes of high-energy-density ternary pouch batteries through the reference electrode and electrochemical impedance spectroscopy. At the same time, a weakly solvating electrolyte (WSE) is introduced, which promotes the charge transfer at the graphite carbon material/electrolyte interface by reducing the desolvation energy barrier. The developed electrolyte can achieve the fast charging capability of pouch batteries at high areal density (2.6 mAh/cm2) with 80% of the charge in 10 minutes without causing lithium plating. For the detection of lithium plating under fast charging conditions, the presenter, based on the understanding of the lithium-ion battery negative electrode/electrolyte interface, points out the close correlation between the electrochemical active surface area (ECSA) and the double-layer (EDL) capacitance, and proposes an in situ real-time lithium plating detection method that can be applied to batteries, capable of non-destructive quantitative detection of lithium plating.

Introduction to the Speaker: Yan Chong, Associate Professor and Doctoral Supervisor at Beijing Institute of Technology. His research focuses on the application requirements of lithium batteries under extreme conditions such as ultra-fast charging, high temperature, high pressure, and low temperature, and carries out theoretical and common technology development of electrode/electrolyte materials and interfaces for fast charging/discharging, lithium replenishment mechanisms, and use under extreme environmental conditions, expanding new principles and technologies for cell design and application. He has published more than 70 papers in SCI and applied for more than 30 invention patents, with 11 authorized and one achieved transformation. He presides over projects such as the National Natural Science Foundation of China’s general project and youth science foundation project, and participates in key national research and development plan projects as a key member.

Source: NYNU Academic Activities (Chinese)

https://www.nynu.edu.cn/info/1048/27711.htm