Dual Roles of Li₃N as an Electrode Additive for Li‐Excess Layered Cathode Materials: A Li‐Ion Sacrificial Salt and Electrode‐Stabilizing Agent

Abstract

Li CO -passivated Li N with high stability is prepared by aging Li N powder in dry air, and is then used as an electrode additive for a Li(Li Ni Co Mn )O (LLMO) cathode material. The material shows a large irreversible capacity of 800 mA h g during the first charge, with the formation of a Li N intermediate product. Acting as a Li sacrificial salt for a LLMO(+)/graphite(-) Li-ion battery, 2 wt % Li N results in a 10 % increase in discharge capacity. The Li N intermediate product reacts with the electrolyte, forming a uniform and regular surface film on the cathode. Moreover, chemical bonding between LLMO and N improves the electrode stability, resulting in excellent electrochemical performance.

DMF stabilized Li3N slurry for manufacturing self-prelithiatable lithium-ion capacitors

“…However, the Liquid-Li 3 N-DMF and Solid-Li 3 N-DMF ( Fig. 2f) have no difference with DMF and Li 3 N. It further confirmed that there might be no reactions occurred between Li 3 N and DMF, due to the super sensitivity of FT-IR method [37]. The FT-IR spectrum of Solid-Li 3 N-DMSO is shown in the Fig.…”

Unveiling the Impact of the Polypyrrole Coating Layer Thickness on the Electrochemical Performances of LiNi0.5Co0.2Mn0.3O2 in Li–Ion Battery

“…After 200 cycles, the discharge capacities of the samples NCM, PPy1, PPy3, PPy5 and PPy7 are 76, 74, 105, 128 and 98 mA h g −1 , corresponding to a capacity retention ratio of 41.1%, 38.5%, 55.5%, 67.2% and 56.3%, respectively. Previous reports have shown that highly acid HF generated from the decomposition of the electrolyte during charge‐discharge process can erode the surface of cathode materials to destroy the surface structure of electrode, resulting in a poor cycling performance . In present investigation, PPy as a protective layer coated on the surface of cathode can effectively prevents the surface from the direct exposing to the electrolyte and corroding by HF.…”

Li2O:Li–Mn–O Disordered Rock‐Salt Nanocomposites as Cathode Prelithiation Additives for High‐Energy Density Li‐Ion Batteries

“…Sacrificial salts (e.g., azides, oxocarbones, dicarboxylic acids, or hydrazides) contain oxidizable anions that lose electrons during the first charge, forming Li + donors and gaseous species (e.g., CO, CO 2 , or N 2 ) amounting to ≈70% of the salt weight. In spite of the promising improved potential ranges 3–4.5 V versus Li + /Li, the uncontrolled evolution of gases could potentially damage the battery.…”