Design of a Dual-Electrolyte Battery System Based on a High-Energy NCM811-Si/C Full Battery Electrode-Compatible Electrolyte

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Shenggong He
  • Shimin Huang
  • Haiqing Qin
  • Yan Shan
  • Xianhua Hou

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)54069–54078
Journal / PublicationACS Applied Materials and Interfaces
Volume13
Issue number45
Online published8 Nov 2021
Publication statusPublished - 17 Nov 2021

Abstract

Rechargeable lithium-ion batteries using high-capacity anodes and high-voltage cathodes can deliver the highest possible energy densities among all electrochemical devices. However, there is no single electrolyte with a wide and stable electrochemical window that can accommodate both a high-voltage cathode and a low-voltage anode so far. Here, we propose that a strategy of using a hybrid electrolyte should be applied to realize the full potential of a Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM811)-silicon/carbon (Si/C) full cell by simultaneously achieving optimal redox chemistry at both the NCM811 cathode and the Si/C anode. The hybrid-electrolyte design spatially separates the cathodic electrolytes from anodic electrolytes by a Nafion-based separator. The ionic liquid electrolyte (LiTFSI-Pyr13TFSI) on the cathode side can stand high work potentials and form a stable cathodic electrolyte intermediate (CEI) on NCM811. Meanwhile, a stable solid electrolyte intermediate (SEI) and high cycling stability can also be achieved on the anode side, enabled by a localized high concentration of ether-based electrolytes (LiTFSI-DME/HFE). The decoupled NCM811-Si/C full cell exhibits excellent long-term cycling performance with ultrahigh capacity retention for over 1000 cycles, thanks to the synergy of the cathode-side and anode-side electrolytes. This hybrid-electrolyte strategy has been proven to be applicable for other high-performance battery systems such as dual-ion batteries (DIB).

Research Area(s)

  • hybrid electrolytes, ionic liquid electrolyte, lithium-ion batteries, localized high-concentration electrolyte, silicon/carbon

Citation Format(s)

Design of a Dual-Electrolyte Battery System Based on a High-Energy NCM811-Si/C Full Battery Electrode-Compatible Electrolyte. / He, Shenggong; Huang, Shimin; Zhao, Yu; Qin, Haiqing; Shan, Yan; Hou, Xianhua.

In: ACS Applied Materials and Interfaces, Vol. 13, No. 45, 17.11.2021, p. 54069–54078.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review