Catalytically Induced Robust Inorganic‐Rich Cathode Electrolyte Interphase for 4.5 V Li||NCM622 Batteries

Zhongsheng Wang; Chunlei Zhu; Jiandong Liu; Xinhong Hu; Yulu Yang; Shihan Qi; Huaping Wang; Daxiong Wu; Junda Huang; Pengbin He; Jianmin Ma

doi:10.1002/adfm.202212150

journal article Feb 13, 2023

Catalytically Induced Robust Inorganic‐Rich Cathode Electrolyte Interphase for 4.5 V Li||NCM622 Batteries

Zhongsheng Wang Chunlei Zhu Jiandong Liu Xinhong Hu Yulu Yang Shihan Qi Huaping Wang

Daxiong Wu

Junda Huang Pengbin He Jianmin Ma

Advanced Functional Materials Vol. 33 No. 19 · Wiley

View at Publisher Save 10.1002/adfm.202212150

Abstract

AbstractTailoring inorganic components of cathode electrolyte interphase (CEI) and solid electrolyte interphase (SEI) is critical to improving the cycling performance of lithium metal batteries. However, it is challenging due to complicated electrolyte reactions on cathode/anode surfaces. Herein, the species and inorganic component content of the CEI/SEI is enriched with an objectively gradient distribution through employing pentafluorophenyl 4‐nitrobenzenesulfonate (PFBNBS) as electrolyte additive guided by engineering bond order with functional groups. In addition, a catalytic effect of LiNi0.6Mn0.2Co0.2O2 (NCM622) cathode is proposed on the decomposition of PFBNBS. PFBNBS with lower highest occupied molecular orbital can be preferentially oxidized on the NCM622 surface with the help of the catalytic effect to induce an inorganic‐rich CEI for superior electrochemical performance at high voltage. Moreover, PFBNBS can be reduced on the Li surface due to its lower lowest unoccupied molecular orbital , increasing inorganic moieties in SEI for inhibiting Li dendrite generation. Thus, 4.5 V Li||NCM622 batteries with such electrolyte can retain 70.4% of initial capacity after 500 cycles at 0.2 C, which is attributed to the protective effect of the excellent CEI on NCM622 and the inhibitory effect of its derived CEI/SEI on continuous electrolyte decomposition.

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Published: Feb 13, 2023
Vol/Issue: 33(19)
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Authors

Z

Zhongsheng Wang