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Simultaneous Stabilization of LiNi 0.76 Mn 0.14 Co 0.10 O 2 Cathode and Lithium Metal Anode by Lithium Bis(oxalato)borate as Additive

Simultaneous Stabilization of LiNi 0.76 Mn 0.14 Co 0.10 O 2 Cathode and Lithium Metal Anode by Lithium Bis(oxalato)borate as Additive

Wengao Zhao, Lianfeng Zou, Jianming Zheng, Haiping Jia, Junhua Song, Mark H Engelhard, Chongmin Wang, Wu Xu, Yong Yang, Ji-Guang Zhang

ChemSusChem. 2018 Jul 11;11(13):2211-2220.

PMID: 29717541

Abstract:

The long-term cycling performance, rate capability, and voltage stability of lithium (Li) metal batteries with LiNi0.76 Mn0.14 Co0.10 O2 (NMC76) cathodes is greatly enhanced by lithium bis(oxalato)borate (LiBOB) additive in the LiPF6 -based electrolyte. With 2 % LiBOB in the electrolyte, a Li∥NMC76 cell is able to achieve a high capacity retention of 96.8 % after 200 cycles at C/3 rate (1 C=200 mA g-1 ), which is the best result reported for a Ni-rich NMC cathode coupled with Li metal anode. The significantly enhanced electrochemical performance can be ascribed to the stabilization of both the NMC76 cathode/electrolyte and Li-metal-anode/electrolyte interfaces. The LiBOB-containing electrolyte not only facilitates the formation of a more compact solid-electrolyte interphase on the Li metal surface, it also forms a enhanced cathode electrolyte interface layer, which efficiently prevents the corrosion of the cathode interface and mitigates the formation of the disordered rock-salt phase after cycling. The fundamental findings of this work highlight the importance of recognizing the dual effects of electrolyte additives in simultaneously stabilizing both cathode and anode interfaces, so as to enhance the long-term cycle life of high-energy-density battery systems.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP244761293	Lithium bis(oxalato)borate		244761-29-3	Price

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