Improving cyclic stability of lithium nickel manganese oxide cathode at elevated temperature by using dimethyl phenylphosphonite as electrolyte additive

Complementary Strategies Toward the Aqueous Processing of High‐Voltage LiNi0.5Mn1.5O4 Lithium‐Ion Cathodes

“…With respectt ot he overall cycling stability,t he comparisono ft he corresponding potential profiles (Figure 8b)i ndicatest hat the more pronounced decrease in capacity for CMC and PA-CMC largely originates from as hortening of the voltage plateau associated with the nickel redox reaction (see also Figures S5 and S6), indicating that this fading is associated either with the loss of active material (i.e.,the loss of electronic contact) or ap artial activem aterial degradation, for example, as ar esult of the Ni 2 + dissolution into the electrolyte. Notably,t he performance at elevated Cr ates, particularly for dis-/charge rates of 2C and higher, follows the order CA-CMC < CMC < PA-CMC,r evealing ab eneficial impact of the thin phosphate coating on the charget rans-fer across the electrode/electrolytei nterface, [53,[57][58][59] whereas the cross-linked binder apparently hampers the lithium ion de-/insertion, as also evidentf rom the relatively more pronounced IR drop and internal polarization for CMC and even more pronounced for CA-CMC compared to PA-CMC (Figure 9b). 87.24 %a nd 98.67 < 98.87 < 98.94 %, for the first and the following cycles, respectively).…”

“…[52][53][54]57] The rate capability test, presented in Figure 9, shows the same trend for these three different electrode compositions, that is, ac onstantly higher capacity for PA-CMC and an enhanced cycling stability for CA-CMC (Figure 9a). Notably,t he performance at elevated Cr ates, particularly for dis-/charge rates of 2C and higher, follows the order CA-CMC < CMC < PA-CMC,r evealing ab eneficial impact of the thin phosphate coating on the charget rans-fer across the electrode/electrolytei nterface, [53,[57][58][59] whereas the cross-linked binder apparently hampers the lithium ion de-/insertion, as also evidentf rom the relatively more pronounced IR drop and internal polarization for CMC and even more pronounced for CA-CMC compared to PA-CMC (Figure 9b). The comparablyl ower rate capability of the CA-CMC electrodes furthers upports the previous conclusion that for these electrodes ah omogeneous binder film coverst he LNMO particles.…”

Interface modification in high voltage spinel lithium-ion battery by using N-methylpyrrole as an electrolyte additive

“…The low frequency region of the straight line is related to the Li + diffusion process in the bulk of the electrode [35][36][37]. The spectra were fitted by using the equivalent circuit model insert in Fig.…”

Research Progress in Improving the Cycling Stability of High-Voltage LiNi0.5Mn1.5O4 Cathode in Lithium-Ion Battery

“…In order to suppress the reaction between the LNMO and electrolytes in HVLIBs, several electrolyte additives were so far identified to be suitable for LNMO cathodes, including inter alia tris (hexafluoro-iso-propyl) phosphate [166], lithium bis(oxalate) borate [167], 1,3-propane sultone [168], thiophene derivatives [169], N , N ′-4,4′-diphenylmethane-bismaleimide [170], 1-propylphosphonic acid cyclic anhydride [171], trimethylboroxine [172], and glutaric anhydride [173]. These organic additives were electrochemically polymerized more quickly than the base electrolyte solution during charging batteries and tended to form a conductive film on the cathode at high voltages, then suppressed the decomposition of electrolyte solvents, and improved the cycling performances of the batteries [174–176]. …”