Insights into the improved cycle and rate performance by ex-situ F and in-situ Mg dual doping of layered oxide cathodes for sodium-ion batteries

Strain Engineering by Local Chemistry Manipulation of Triphase Heterostructured Oxide Cathodes to Facilitate Phase Transitions for High‐Performance Sodium‐Ion Batteries

“…At the end of the 1st discharge, the P3″ (104) peak appeared, and the P3 (015) peak disappeared. [ 63–66 ] In situ XRD test results of the LLS‐NaNCMM15 cathode in the second cycle further demonstrate the maintenance of structural stability in continuous cycling. Consequently, the simple transformation from P2/P3/spinel to P2/P3″/spinel was observed in the voltage region of 1.5–4.3 V. In contrast, LLS‐NaNCM involves large gliding of the TMO 2 layer concerning the complex phase transition (P2/P3/spinel → P2/P3″/spinel → P2/P3/spinel → P2'/P3″/spinel) and a huge volume change, as shown in the phase transition schematic (Figure 5c and Figures S16 and S17, Supporting Information).…”

Improving the performances of low concentration electrolytes via dual interfacial modification of the fluoroethylene carbonate solvent and lithium difluoro(oxalato)borate additive

“…Subsequently, the thin and effective CEI film produced by the L-std-BF electrolyte suppresses the excessive decomposition of the electrolyte and enables a much improved cycling stability of the cathodes. 24–26…”

“…Subsequently, the thin and effective CEI film produced by the L-std-BF electrolyte suppresses the excessive decomposition of the electrolyte and enables a much improved cycling stability of the cathodes. [24][25][26] It is known that the physical and chemical properties of the CEI are closely related to its chemical composition and the heterogeneous multi-layer structure. The chemical composition of the CEI film on the LFP cathode was studied by XPS after 5 cycles in L-std-BF and L-std electrolytes at different etching times.…”

Manganese-based layered oxides for electrochemical energy storage: a review of degradation mechanisms and engineering strategies at the atomic level

“…Various dopants have been proposed, including cationic dopants (Cr, Ta, and Al) and anionic dopants (F and Br). 24,34,[121][122][123] Inferior structural stability and electronic conductivity have been demonstrated to limit the electrochemical performance of d-MnO 2 . Zhao et al 124 proposed that incorporating Cr 3+ into d-MnO 2 could boost its rate capability and cycling stability within the potential window of 0-1.2 V (vs. Ag/AgCl).…”

“…Various dopants have been proposed, including cationic dopants (Cr, Ta, and Al) and anionic dopants (F and Br). 24,34,121–123…”