Effective Stabilization of Ncm622 Cathodes in Aqueous/Non-Aqueous Hybrid Electrolytes by Adding a Phosphazene Derivate as Co-Solvent

21 Pages Posted: 5 Apr 2022

See all articles by Leilei Du

Leilei Du

University of Münster

Xu Hou

affiliation not provided to SSRN

Wenguang Zhao

Peking University - Shenzhen Graduate School

Lukas Haneke

affiliation not provided to SSRN

Jun Wang

Southern University of Science and Technology

Xiaokang Ju

Xiamen University

Xiangsi Liu

Xiamen University

Yong Yang

Xiamen University - State Key Laboratory of Physical Chemistry of Solid Surfaces

Jens Matthies Wrogemann

affiliation not provided to SSRN

Sven Künne

affiliation not provided to SSRN

Martin Winter

University of Münster

Tobias Placke

affiliation not provided to SSRN

Jie Li

Polytechnic University of Milan

Abstract

Recent progress in “water-in-salt” electrolytes (WiSEs) and “hybrid aqueous/non-aqueous electrolytes (HANEs)” made broader choices of active material in aqueous Li-ion batteries (ALIBs), because of their compared to standard aqueous electrolytes expanded electrochemical stability windows (ESWs). Exploring high energy density ALIBs is a consequently meaningful research topic. However, the formation of an ineffective interphase layer on the cathode surface in aqueous electrolyte obstructs the utilization of layered high energy cathode materials. Herein, a new organic compound, ethoxy-(pentafluoro)-cyclotriphosphazene (PFN) is introduced into HANEs as co-solvent. The addition of PFN can decrease the viscosity of highly concentrated HANEs and influence the solvation structure of Li+, facilitating the formation of uniform cathode electrolyte interphase (CEI). PFN forms the CEI component monoester phosphate, which betters the performance of ALIBs based on NCM622 || TiO2@LiTi2(PO4)3 (P:N=1.5:1) that exhibit enhanced cycling stability with 79.3% capacity retention after 200 cycles at 1 C in the voltage range of 1.1-2.7 V, indicating that PFN can be a useful species to stabilize NCM622 operation in HANEs.

Keywords: ethoxy-(pentafluoro)-cyclotriphosphazene (PFN), aqueous electrolytes, hybrid electrolytes, high concentration, high energy density aqueous lithium ion batteries

Suggested Citation

Du, Leilei and Hou, Xu and Zhao, Wenguang and Haneke, Lukas and Wang, Jun and Ju, Xiaokang and Liu, Xiangsi and Yang, Yong and Wrogemann, Jens Matthies and Künne, Sven and Winter, Martin and Placke, Tobias and Li, Jie, Effective Stabilization of Ncm622 Cathodes in Aqueous/Non-Aqueous Hybrid Electrolytes by Adding a Phosphazene Derivate as Co-Solvent. Available at SSRN: https://ssrn.com/abstract=4076090 or http://dx.doi.org/10.2139/ssrn.4076090

Leilei Du

University of Münster ( email )

Xu Hou

affiliation not provided to SSRN ( email )

No Address Available

Wenguang Zhao

Peking University - Shenzhen Graduate School ( email )

Guangdong
China

Lukas Haneke

affiliation not provided to SSRN ( email )

No Address Available

Jun Wang

Southern University of Science and Technology ( email )

Xiaokang Ju

Xiamen University ( email )

Xiangsi Liu

Xiamen University ( email )

Xiamen, 361005
China

Yong Yang

Xiamen University - State Key Laboratory of Physical Chemistry of Solid Surfaces ( email )

No. 422, South Siming Road
Xiamen, Fujian 361005
China

Jens Matthies Wrogemann

affiliation not provided to SSRN ( email )

No Address Available

Sven Künne

affiliation not provided to SSRN ( email )

No Address Available

Martin Winter

University of Münster ( email )

Tobias Placke

affiliation not provided to SSRN ( email )

No Address Available

Jie Li (Contact Author)

Polytechnic University of Milan ( email )

Piazza Leonardo da Vinci
Milan, 20100
Italy

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