Sequential Effect of Dual‐Layered Hybrid Graphite Anodes on Electrode Utilization During Fast‐Charging Li‐Ion Batteries

• DOI: 10.1002/advs.202403071
• Publication Date: 2024-06-13T08:55:14Z
• Authors: Jiwoong Kang; Jaejin Lim; Hyuntae Lee; Seongsu Park; Cheol Bak; Yewon Shin; Hyeongguk An; Mingyu Lee; Minju Lee; Soyeon Lee; Byungjun Choi; Dongyoon Kang; Sujong Chae; Yong Min Lee; Hongkyung Lee
• Keywords: DISORDER; Science; 01 natural sciences; CAPACITY; ENERGY; LITHIUM-ION; DEPOSITION; dual‐layered electrodes; CHALLENGES; resistance distribution; hybrid graphite anodes; Q; TRANSPORT PHENOMENA; PERFORMANCE; fast-charging batteries; dual-layered electrodes; 540; 620; 0104 chemical sciences; NATURAL GRAPHITE; fast‐charging batteries; CELLS; temporal SOC gradient; Research Article

Abstract To recharge lithium‐ion batteries quickly and safely while avoiding capacity loss safety risks, a novel electrode design that minimizes cell polarization at higher current is highly desired. This work presents dual‐layer (DLE) technology via sequential coating of two different anode materials to minimize the overall resistance upon fast charging. Electrochemical impedance spectroscopy distribution relaxation times analysis revealed dynamic evolution impedances in synthetic graphite (SG) change state charge (SOC), whereas natural (NG) maintains its original regardless SOC variation. disparity dictates sequence NG SG layers within DLE, considering temporal gradient developed Simulation experimental results suggest DLE positioning on top (second‐layer) bottom (first‐layer), respectively, can effectively reduce 4 C‐rate (15‐min charging), demonstrating retention (61.0%) over 200 cycles than counterpart with reversal coating, single‐layer electrodes using or NG/SG binary mixtures. Hence, this study guide combinatorial for multi‐layer various active lower‐resistivity, thick‐electrode design.