Effective stabilization of NCM622 cathodes in aqueous/non-aqueous hybrid electrolytes by adding a phosphazene derivate as Co-solvent

Du，Leilei1; Hou，Xu2; Zhao，Wenguang3; Haneke，Lukas1; Wang，Jun4; Ju，Xiaokang2; Liu，Xiangsi5; Yang，Yong5; Wrogemann，Jens Matthies1; Künne，Sven1; Winter，Martin1,2; Placke，Tobias1; Li，Jie2,6

2022-09-01

10.1016/j.jpowsour.2022.231670

JOURNAL OF POWER SOURCES   影响因子和分区

0378-7753

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 || TiO@LiTi(PO) (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.

Aqueous electrolytes Ethoxy-(pentafluoro)-cyclotriphosphazene (PFN) High concentration High energy density aqueous lithium ion batteries Hybrid electrolytes

EI

英语

其他

European Commission[829145];Deutsche Forschungsgemeinschaft[Li 2916/2-1];

20222412210238

Cathodes ; Electrolytes ; Lithium compounds ; Titanium dioxide

Electric Batteries and Fuel Cells:702 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2

MATERIALS SCIENCE

2-s2.0-85131446347

Scopus

1.MEET Battery Research Center,Institute of Physical Chemistry,University of Münster,Münster,Corrensstr. 46,48149,Germany
2.Helmholtz-Institute Münster (HI MS),IEK-12,Forschungszentrum Jülich GmbH,Münster,Corrensstr. 46,48149,Germany
3.School of Advanced Materials,Peking University,Shenzhen Graduate School,Shenzhen,518055,China
4.Department of Materials Science and Engineering,Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,518055,China
5.Department of Chemistry,Xiamen University,Xiamen,361005,China
6.Department of Energy,Politecnico di Milano,Milano,Via Lambruschini 4,20156,Italy

Du，Leilei,Hou，Xu,Zhao，Wenguang,et al. Effective stabilization of NCM622 cathodes in aqueous/non-aqueous hybrid electrolytes by adding a phosphazene derivate as Co-solvent[J]. JOURNAL OF POWER SOURCES,2022,541.

Du，Leilei.,Hou，Xu.,Zhao，Wenguang.,Haneke，Lukas.,Wang，Jun.,...&Li，Jie.(2022).Effective stabilization of NCM622 cathodes in aqueous/non-aqueous hybrid electrolytes by adding a phosphazene derivate as Co-solvent.JOURNAL OF POWER SOURCES,541.

Du，Leilei,et al."Effective stabilization of NCM622 cathodes in aqueous/non-aqueous hybrid electrolytes by adding a phosphazene derivate as Co-solvent".JOURNAL OF POWER SOURCES 541(2022).