Phase Equilibria of the System La2O3–NiO–Li2O at 700, 800, and 900°C

Enhanced Electrochemical and Thermal Stabilities of Li[Ni0.88Co0.09Al0.03]O2 Cathode Material by La4NiLiO8 Coating for Li–Ion Batteries

“…HRTEM characterization in the latter discussion confirms that La 4 NiLiO 8 rather than La 2 O 3 can be observed in the surface layer of 1 wt.% La‐coated NCA. La 4 NiLiO 8 was reported to be a K 2 NiF 4 ‐type compound that possesses excellent chemical and thermal stability . In addition, as reported by Li et al., La 4 NiLiO 8 is a compound that could be obtained in the La 2 O 3 ‐NiO‐Li 2 O system, implying that partial lithium residues (Li 2 O/LiOH) attached on the material surface can react with coating matrix during the annealing process, thus reducing the pH value of the cathode materials (Table S1).…”

“…La 4 NiLiO 8 was reported to be a K 2 NiF 4 ‐type compound that possesses excellent chemical and thermal stability . In addition, as reported by Li et al., La 4 NiLiO 8 is a compound that could be obtained in the La 2 O 3 ‐NiO‐Li 2 O system, implying that partial lithium residues (Li 2 O/LiOH) attached on the material surface can react with coating matrix during the annealing process, thus reducing the pH value of the cathode materials (Table S1). Meanwhile, a small amount of nickel near the surface is inevitably consumed to form the coating layer, which may result in some loss of capacity.…”

Thermodynamic analysis of the ternary La–Ni–O system

“…Solid solutions based on La 2 O 3 , La 2 NiO 4 , or NiO have not been observed [50]. Revcolevschi [37] pointed out the existence of an eutectic in the system La 2 O 3 -NiO near 70 [51] cannot be used to construct the pseudobinary section La 2 O 3 -NiO.…”

“…Phase diagrams of the La-Ni-O system are available as partial isothermal sections at 1373 and 1473 K [17,36,49], a pseudobinary section La 2 O 3 -NiO [50][51][52], and a vertical section along the La 2 NiO 4 -LaNiO 3 join [14,49]. The La-Ni-O liquidus surface is unknown.…”

Estudo da preparação de microcristais de LiLa(WO4)2:TR3+ para aplicações fotônicas

“…Acima à direita, foto do detalhe do arranho, mostrando a pastilha (disco branco) [166] Figura 6-1: Fibras de LiLa(1-x)Eux(WO4)2 obtidas pelo método de µ-PD no modo resistivo de: (A) x = 0,10, onde os detalhes mostram a superfície da fibra isenta de irregularidades e a secção do diâmetro quase circular (levemente polida); (B) LEW (x = 1,0), onde os detalhes mostram regiões da fibra sem trincas, mesmo depois de algumas horas após o crescimento e, com trincas aparentes devido ao estresse térmico durante o resfriamento. A superfície da fibra não apresenta irregularidades [149] 2O -WO3 [111,114], La2O3 -WO3 [108] e Li2O -La2O3 (indisponível) [194,195], e das seções internas correspondentes ao sistema pseudobinário Li2W2O7 -La2W2O9 proposta de estudo deste trabalho e do sistema LiLa(WO 4)2 -La2(WO4)3 (linha pontilhada interna ao ternário -dados indisponíveis) [40] …”