Robust Artificial Interphases Constructed by a Versatile Protein‐Based Binder for High‐Voltage Na‐Ion Battery Cathodes

Abstract

Figure 6. Stability of the electrodes. a) Self-discharging tests of the two electrodes. b) Mn concentration of the electrolytes determined by ICP. c) Ex situ XRD of the SP/PAA electrodes. d) Ex situ XRD of the PVDF electrodes. e) Schematic illustration of the features and functions of SP/PAA and PVDF binders.

Li2Cu0.1Ni0.9O2 with Copper Substitution: A New Cathode Prelithiation Additive for Lithium-Ion Batteries

“…Figure c presents the first three consecutive cycles of the cyclic voltammogram (CV) of LCNO over 2.8–4.4 V. The CV curve at the first cycle is obviously different from the following cycles, which shows an oxidation peak around 3.7 V and a broad shoulder over 4.0–4.2 V. The exceptional first cycle behavior conducts to the lithium contribution ability of LCNO. After the first charge process, the following CV curves are reversible, in line with the cycling performances in Figure b. , Figure S9 shows the electrochemical performance of Li metal/NCM811 half-cells with different contents of LCNO. As shown in Figure S9a, the initial charge capacity increases proportionately to the amount of LCNO within the cathode, implying more active lithium in the first cycle.…”

“…After the first charge process, the following CV curves are reversible, in line with the cycling performances in Figure 3b. 37,38 Figure S9 shows the electrochemical performance of Li metal/NCM811 half-cells with different contents of LCNO. As shown in Figure S9a, the initial charge capacity increases proportionately to the amount of LCNO within the cathode, implying more active lithium in the first cycle.…”

A binder-driven cathode–electrolyte interphase via a displacement reaction for high voltage Na3V2(PO4)2F3 cathodes in sodium-ion batteries

“…A binder plays a role in holding active particles during operation via adhesive and cohesive forces. For example, sodium carboxylate-based binders 13,[23][24][25][26] can strongly interact with the surface of metal-oxide-based NVPF cathodes via iondipole interactions, which tightly bind the electrode components. Thus, these sodium carboxylate-based binders exhibit improved mechanical properties, such as robust adhesion and uniform coverage of the active particles, compared to conventional poly(vinylidene diuoride) (PVDF) binders, which exhibit weak adhesion via van der Waals forces.…”

Fluorine anion modification of high-voltage Mn-rich phosphate cathodes for high-power and long-lasting sodium-ion batteries

“…When accompanied by multi-electron reactions, Na 4 MnCr(PO 4 ) 3 could deliver an ultrahigh energy density of ~ 566 Wh kg -1 (1.4-4.6 V versus Na + /Na), which broke the record of the NASICON family. Similar to other Mn-based phosphate materials, nevertheless, it still suffers from low intrinsic electronic conductivity and inferior cycling stability (obvious capacity fading within 20 cycles) 36 , which may stem from the Mn 2+ dissolution in the electrolyte and electrolyte decomposition at a high cut-off voltage (> 4.5 V) 17,25,39,40 . To our knowledge, there is no relevant work to further improve the electrochemical performances of Na 4 MnCr(PO 4 ) 3 .…”