Simultaneous Stabilization of LiNi_0.76Mn_0.14Co_0.10O₂ Cathode and Lithium Metal Anode by Lithium Bis(oxalato)borate as Additive

Abstract

The long-term cycling performance, rate capability, and voltage stability of lithium (Li) metal batteries with LiNi Mn Co O (NMC76) cathodes is greatly enhanced by lithium bis(oxalato)borate (LiBOB) additive in the LiPF -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 ), 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.

Adiponitrile (C6H8N2): A New Bi‐Functional Additive for High‐Performance Li‐Metal Batteries

“…Despite recent efforts, development of practical Li/Ni‐rich NCM batteries that can deliver long‐term cycling stability with high‐capacity loading remains a great challenge because of the lack of understanding of the interfacial stabilities of the anode/electrolyte and cathode/electrolyte interfaces. Indeed, stable cycling of Li/Ni‐rich NCM batteries has been achieved only with low capacity loading of Ni‐rich NCM cathodes (<5 mg cm −2 ) …”

Use of Ce to Reinforce the Interface of Ni‐Rich LiNi0.8Co0.1Mn0.1O2 Cathode Materials for Lithium‐Ion Batteries under High Operating Voltage

“…[1][2][3] Rechargeable batteries, as one type of electrical energy storaged evice, can be applied not only for small devicess uch as laptopsa nd smartphones, but also for larges ystems, such as national electric grids, and spacecrafta nd transportation applications,s uch as electric vehicles (EVs). [1][2][3] Rechargeable batteries, as one type of electrical energy storaged evice, can be applied not only for small devicess uch as laptopsa nd smartphones, but also for larges ystems, such as national electric grids, and spacecrafta nd transportation applications,s uch as electric vehicles (EVs).…”

“…Owing to increasingg lobal energy demandsa nd severe environmentalproblems, electrical energy storagedevices have entered into public concern. [1][2][3] Rechargeable batteries, as one type of electrical energy storaged evice, can be applied not only for small devicess uch as laptopsa nd smartphones, but also for larges ystems, such as national electric grids, and spacecrafta nd transportation applications,s uch as electric vehicles (EVs). [4,5] Next-generation energy storage systems, such as Li-air batteries, [6] Li-O 2 batteries, [7,8] Li-N 2 batteries, [9] and Zn-air batteries, [10] are attractive owing to their high theoretical energy densities and flexible structures.…”

Improving Stability of LiCoO2 Cathode by Using Lithium Bis(Trifluoroborane)‐5‐Cyano‐2‐(Trifluoromethyl) Benzimidazolide as Additive

“…Comparing to the literature results of using Li salt as an additive, similar advantageous effects of leading to thin and conductive SEI layer on cathode and of improved cyclability were frequently mentioned. [27][28][29][30][31][32][33][34][35][36] The highly stable anions of Li[CBTBI] can possibly adsorb and passivate the active surface cation (metal) sites left by oxygen extraction from cathode degradation. This can consequently suppress acid-base-initiated SEI formation, resulting in an enhanced stability of the cathode surface.…”

“…Using Li salts as additives can be expected leading to SEI with good Li ion conductivity, of which many examples are recently reported to improve the efficiencies and cycling stability of LIBs and a low impedance and thin SEI (CEI) is frequently attributed for the improved performance. [27][28][29][30][31][32][33][34][35][36] However, none of these salt additive reports used LiCoO 2 as the cathode.…”