Chemically-induced cathode–electrolyte interphase created by lithium salt coating on Nickel-rich layered oxides cathode

Critical role of corrosion inhibitors modified by silyl ether functional groups on electrochemical performances of lithium manganese oxides

“…More specifically, the Si-additives were initially reacted with TBAF (which is equivalent to F − based on their similar chemical reactivities) [43][44][45] , and the resulting solutions were analyzed by 1 H NMR spectroscopy to confirm modifications of the Si-additive molecular structures. Indeed, in the 1 H NMR spectra, new peaks were observed at 3.27 ppm (singlet) and ~0.00 ppm (singlet) in the presence of the Si-additives, and these distinctive signals corresponded to methanol [46][47][48] and the fluorinated silane compounds [49][50][51][52] , respectively. These new peaks provide strong evidence to support the effective scavenging of the F − species by the Si-additives in the cell.…”

Designing positive electrodes with high energy density for lithium-ion batteries

“…5b) for (i) suppressing electrophilic attack from an electrode to an electrolyte while allowing ion transfer, (ii) protecting them from damaging chemical reagents such as HF, thus preventing TM from dissolving to the electrolyte, and (iii) forming a rigid shell to restrict crack formation upon cycling. Indeed, several materials, including ionic conductors, 50,51,54,66,67,189 mixed conductors (active materials), 46,[56][57][58]60,[190][191][192] organic compounds, 58,60,193,194 and electrochemically inactive oxides/polyanionic compounds 44,45,[47][48][49]52,53,55,59,[61][62][63][64][65][68][69][70][195][196][197][198][199][200][201] have been investigated as coatings for passivating the active surface of largecapacity/high-voltage electrode materials. For example, a B 2 O 3coated nickel-rich layered oxide retained 85% of its capacity aer 200 cycles, signicantly more than that of a pristine compound (68%).…”

Surface Modification Strategies for Improving the Cycling Performance of Ni‐Rich Cathode Materials

“…Materials used for this purpose include binary oxide coatings (e.g., WO 3 ), phosphates (e.g., LiMnPO 4 ) and glasses (Li 2 O‐B 2 O 3 ), to name a few. Promising results were obtained by Jang et al using barrier coating with HF scavenging groups. This combined approach involved coating NCM811 with a 5 nm layer of lithium tetra(trimethylsilyl) borate, which resulted in improved capacity retention from 54.4 % to 75 % after 100 cycles at C/10 rate and 55 °C.…”