Accurate Determination of Coulombic Efficiency for Lithium Metal Anodes and Lithium Metal Batteries

Abstract Lithium (Li) metal is an ideal anode material for high energy density batteries. However, the low Coulombic efficiency (CE) and the formation of dendrites during repeated plating and stripping processes have hindered its applications in rechargeable Li metal batteries. The accurate measurement of Li CE is a critical factor to predict the cycle life of Li metal batteries, but the measurement of Li CE is affected by various factors that often lead to conflicting values reported in the literature. Here, several parameters that affect the measurement of Li CE are investigated and a more accurate method of determining Li CE is proposed. It is also found that the capacity used for cycling greatly affects…

• UD
  U.S. Department of Energy
• VT
  Vehicle Technologies Program

  Award: DE‐AC02‐05CH11231