Integrated Dual‐Phase Ion Transport Design Within Electrode for Fast‐Charging Lithium‐Ion Batteries
Shuibin Tu, Yan Zhang, Dongsheng Ren, Zihe Chen, Wenyu Wang, Renming Zhan, Xiancheng Wang, Kai Cheng, Yangtao Ou, Xiangrui Duan, Li Wang, Yongming Sun
Abstract
Abstract The development of fast‐charging lithium‐ion batteries with high energy density is hindered by the sluggish Li + transport and substantial polarization within graphite electrodes. Herein, this study proposes that the integrated design of liquid electrolyte and solid electrolyte, a dual‐phase electrolyte (DP‐electrolyte), can facilitate Li + transport within a thick electrode. A 3D Li 3 PS 4 (LPS) network is constructed within the graphite electrode to form the LPS/graphite electrode. This is achieved through the in situ conversion of the P 4 S 16 into the LPS, a process introduced during the slurry processing. Both experimental findings and simulation outcomes indicate that this design mitigates the concentration polarization due to the improved Li + transport capability with an overall high Li + transference number within the electrode. With a high capacity of ≈3.1 mAh cm −2 attributed to the graphite electrode, the LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622)||LPS/graphite cells demonstrate superior fast‐charging capability (4 C , 15 min, charging to ≈87.7%) and stable cycling performance (4 C , 700 cycles, ≈80% capacity retention). Furthermore, they exhibit commendable low‐temperature performance. The Ah‐level pouch cell achieves 87.5% recharge in 15 min with an energy density of ≈221.5 Wh kg −1 . This work offers an alternative avenue for the advancement of fast‐charging lithium‐ion batteries with practical high energy density.