Amide‐Functional, Li3N/LiF‐Rich Heterostructured Electrode Electrolyte Interphases for 4.6 V Li||LiCoO2 Batteries. Issue 15 (4th March 2023)

• Record Type: Journal Article
• Authors: Liu, Jiandong; Wu, Mingguang; Li, Xin; Wu, Daxiong; Wang, Huaping; Huang, Junda; Ma, Jianmin
• Is Part Of: Advanced energy materials. Volume 13:Issue 15(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-03-04
• Subjects: cathode electrolyte interphase -- electrolyte additives -- LiCoO 2 -- lithium metal batteries -- solid electrolyte interphase; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202300084
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Enhancing the charge cut‐off voltage of LiCoO2 at 4.6 V can improve the battery density, however, structural instability is a critical challenge (e.g., electrolyte decomposition, Co dissolution, and structural phase transition). Here, robust electrode electrolyte interphases (EEIs) with the high Li + conductivity offered by polar amide groups and a Li3 N/LiF heterostructure is constructed. 3‐(trifluoromethyl) phenyl isocyanate (3‐TPIC) is rationally designed as an electrolyte additive for sustaining a 4.6 V Li||LiCoO2 battery with such CEI, which can effectively address the challenge of structural instability. The polar amide group can achieve Li + de‐solvation and increase Li + transport. Li3 N/LiF heterostructure in the cathode electrolyte interphase (CEI) can speed up the Li + insertion/extraction for improving Coulombic efficiency and weakening polarization of LiCoO2 at 4.6 V. In addition, the solid electrolyte interphase (SEI) with a similar structure on the Li anode surface contributes to the uniform Li deposition for suppressing the Li dendrite growth. As expected, 4.6 V Li||LiCoO2 batteries with superior EEIs can deliver excellent electrochemical performance. Abstract : 3‐(trifluoromethyl) phenyl isocyanate (3‐TPIC) is demonstrated to promote the formation of a uniform and stable cathode electrolyte interphase/solid electrolyte interphase containing polar amide groups and a lithophilic Li3 N/LiF heterostructure for 4.6 V Li||LiCoO2 batteries. The polar amide groups can achieve Li + desolvation while the lithophilic Li3 N/LiF heterostructure can also speed up the Li + transport.