Air-Stable Li₆CoO₄@Li₅FeO₄ Pre-Lithiation Reagent in Cathode Enabling High Performance Lithium-Ion Batteries

Abstract

Li5FeO4, as a high-capacity built-in pre-lithiation reagent, has attracted wide interest due to its attractive characteristics, such as extremely higher capacity and energy density, low cost, and environmental friendliness. However, the preparation technology of high-stability Li5FeO4 remains a great challenge. Here, we report a highly air-stable Li5FeO4 cathode pre-lithiation reagent by the solid-phase method. The Li5FeO4 is coated with Li6CoO4 (Li6CoO4@Li5FeO4, referred to as LCO@LFO), which can effectively improve the stability of Li5FeO4 materials under ambient atmosphere and significantly enhance the electrochemical performance. The material possesses an initial charge capacity of 518.8mAh g−1 when charged to 4.5 V and exhibits good air-filled capacity retention. Besides, the LiNi0.8Co0.1Mn0.1O2 (NCM811) full-cell with 5 wt% LCO@LFO additive has an initial discharging capacity of 205 mAh g−1 in the charge and discharge interval of 2.0 V–4.5 V (vs Li+/Li), respectively, higher than the initial discharging capacity of 166.5 mAh g−1 of pure NCM811. The reversible specific capacity of the NCM811 with LCO@LFO cathode in the full cell can be increased by 8.8%, which is equivalent to a 14.35% increase in energy density. Our research report opens a door for the commercial application of LCO@LFO, a high-stability cathode composite pre-lithiation reagent.

Oxygen-Tuned Na3V2(PO4)2F3–2yO2y (0 ≤ y < 1) as High-Rate Cathode Materials for Rechargeable Sodium Batteries

“…In terms of the intermittency, locality, and volatility of new energy resources, energy storage systems are urgently needed to remedy such an uneven distribution. , Rechargeable batteries have been widely used for high-efficiency energy storage since the commercialization of lithium ion batteries (LIBs) in the 1990s . The high energy density, long cycling life, fast charge/discharge capability, and low self-discharge of LIBs also make them a good choice for portable electronic devices, electric tools, and electric vehicles including hybrid electric vehicles. − However, the lithium resource in the earth is only 0.006% and is mainly concentrated in South America . The incredibly high price of lithium resource is restricting the huge application of LIBs in the growing energy storage market. , …”

Rationally Designed Sodium Chromium Vanadium Phosphate Cathodes with Multi‐Electron Reaction for Fast‐Charging Sodium‐Ion Batteries

“…They are the most widespread energy storage devices but they are not totally suitable for sustainable development due to the limited lithium resources in countries often with underlying political disputes. [3][4][5] As alternative candidates, sodium-ion batteries (SIBs) have drawn increasing attention by both academic and industrial communities on account of the high abundance of sodium resources. [6,7] Of great promise are inexpensive, high-energy, long-lifespan, and fast-charging SIBs in order to improve on LIBs.…”

Prelithiation Reagents and Strategies on High Energy Lithium‐Ion Batteries

“…The Li 6 CoO 4 coating layer synthesized by solidphase method prevents Li 5 FeO 4 from reacting with CO 2 and H 2 O, and it also provides extra lithium for the battery. [96] The full-cell composed of graphite and NMC811 with 5 wt% Li 6 CoO 4 @Li 5 FeO 4 additive delivered an increase of 14.35 % in energy density compared with the original full-cell. In summary, the prelithiation additive method is an efficient strategy to mitigate the initial active lithium loss.…”

“…Li 6 CoO 4 is relatively stable in air and during cycling, [95] hence it has recently been used as a protective layer for Li 5 FeO 4 . The Li 6 CoO 4 coating layer synthesized by solid‐phase method prevents Li 5 FeO 4 from reacting with CO 2 and H 2 O, and it also provides extra lithium for the battery [96] . The full‐cell composed of graphite and NMC811 with 5 wt% Li 6 CoO 4 @Li 5 FeO 4 additive delivered an increase of 14.35 % in energy density compared with the original full‐cell.…”