Electrochemically exfoliated graphite as a highly efficient conductive additive for an anode in lithium‐ion batteries

• DOI: 10.1002/bte2.20230012
• Publication Date: 2023-08-07T02:29:40Z
• Authors: Dong Seok Kim; Jea Uk Lee; Sung Hyun Kim; Jin‐Yong Hong
• Keywords: TK1001-1841; Production of electric energy or power. Powerplants. Central stations; exfoliated graphene; lithium‐ion batteries; anodes; conductive additives; 01 natural sciences; 0104 chemical sciences

Abstract In this study, the electrochemical characteristics of an anode fabricated using exfoliated graphite (EG), which is mass‐produced method, are evaluated to verify potential EG as a conductive additive. exhibits high electrical conductivity because sp 2 bonding on two‐dimensional plane; provides stable pathway and promotes electron transfer in anode. Furthermore, small number graphene layers provide excellent mechanical properties (elastic modulus, tensile strength), suppresses volume expansion during lithiation; therefore, EG‐based capacity retention charge/discharge cycle stability. The with large specific surface area improves energy density by decreasing amount additive more than 70% compared conventional additives simultaneously increasing active material. electrode 3.0 wt% reaches 376 mAh/g even after 200 cycles at 0.2 C 99% its initial reversible capacity. rate performance was about 370 5.0 C. These results confirm that can be used overcome limitations existing commercial agents.