50C Fast‐Charge Li‐Ion Batteries using a Graphite Anode

Abstract Li‐ion batteries have made inroads into the electric vehicle market with high energy densities, yet they still suffer from slow kinetics limited by the graphite anode. Here, electrolytes enabling extreme fast charging (XFC) of a microsized graphite anode without Li plating are designed. Comprehensive characterization and simulations on the diffusion of Li + in the bulk electrolyte, charge‐transfer process, and the solid electrolyte interphase (SEI) demonstrate that high ionic conductivity, low desolvation energy of Li + , and protective SEI are essential for XFC. Based on the criterion, two fast‐charging electrolytes are designed: low‐voltage 1.8 m LiFSI in 1,3‐dioxolane (for LiFePO 4 ||graphite…

• NN
  National Natural Science Foundation of China

  Awards: 52172257, 22161142017, 22072134, U21A2081
• FR
  Fundamental Research Funds for the Central Universities

  Award: 2021FZZX001‐09
• NS
  Natural Science Foundation of Zhejiang Province

  Award: LZ21B030002