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Due to the assets such as adequate discharge capacity and rational cost, LiNi0.8Co0.15Al0.05O2 (NCA), a high-nickel ternary layered oxide, is regarded to be a favorable cathode contender for lithium-ion batteries. However, the superior commercial application is restricted by the surface residual alkaline lithium salt (LiOH or/and Li2CO3) of nickel-rich cathode materials, which will expedite the disintegration of the structure and the engendering of gas (CO2). Therefore, in this paper, we devise and fabricate a Y(PO3)3 modified LiNi0.8Co0.15Al0.05O2 (NCA), intending to optimize the surface residual alkaline lithium salt (antecedent deportation of H2O and CO2) while forming an in situ triple composite Li-ion conductor coating (Y(PO3)3-Li3PO4-YPO4) to enhance the electrochemical behavior. Under this method, the 2 mol% Y(PO3)3 modified NCA electrode reveals exceptional rate capability (5 C/156.3 mAh gâˆ'1) and extraordinary cycle stability after 200 cycles (2 C/88.3%), whereas the original sample is only 5 C/123.1 mAh gâˆ'1 and 2 C/71.2% after 200 cycles. Conspicuously, even under the draconian circumstances of the high temperature and the high rate at 55 °C/1 C, the 2 mol% Y(PO3)3 modified NCA electrode sustains a high reversible capacity, with an admirable capacity retention rate of 89.4% after 100 cycles. These contented results signify that the surface remodeling tactic presents a viable scheme for ameliorating high-nickel materials’ performance and appropriateness. [ABSTRACT FROM AUTHOR]

LiNi0.8Co0.15Al0.05O2 (NCA), a promising ternary cathode material of lithium-ion batteries, has widely attracted attention due to its high energy density and excellent cycling performance. However, the presence of residual alkali (LiOH and Li2CO3) on the surface will accelerate its reaction with HF from LiPF6, resulting in structural degradation and reduced safety. In this work, we develop a new coating material, LiH2PO4, which can effectively optimize the residual alkali on the surface of NCA to remove H2O and CO2 and form a coating layer with excellent ion conductivity. Under this strategy, the coated sample NCA@0.02Li3PO4 (P2-NCA) provides a capacity of 147.8 mAh gâˆ'1 at a high rate of 5 C, which is higher than the original sample (126.5 mAh gâˆ'1). Impressively, the cycling stabilities of P2-NCA under 0.5 C significantly improved from 85.2% and 81.9% of pristine-NCA cathode to 96.1% and 90.5% at 25 °C and 55 °C, respectively. These satisfied findings indicate that this surface modification method provides a feasible strategy toward improving the performance and applicability of nickel-rich cathode materials. [ABSTRACT FROM AUTHOR]

LiNi0.8Co0.15Al0.05O2 (NCA), a promising ternary cathode material of lithium-ion batteries, has widely attracted attention due to its high energy density and excellent cycling performance. However, the presence of residual alkali (LiOH and Li2CO3) on the surface will accelerate its reaction with HF from LiPF6, resulting in structural degradation and reduced safety. In this work, we develop a new coating material, LiH2PO4, which can effectively optimize the residual alkali on the surface of NCA to remove H2O and CO2 and form a coating layer with excellent ion conductivity. Under this strategy, the coated sample NCA@0.02Li3PO4 (P2-NCA) provides a capacity of 147.8 mAh gâˆ'1 at a high rate of 5 C, which is higher than the original sample (126.5 mAh gâˆ'1). Impressively, the cycling stabilities of P2-NCA under 0.5 C significantly improved from 85.2% and 81.9% of pristine-NCA cathode to 96.1% and 90.5% at 25 °C and 55 °C, respectively. These satisfied findings indicate that this surface modification method provides a feasible strategy toward improving the performance and applicability of nickel-rich cathode materials. [ABSTRACT FROM AUTHOR]

In this paper, via a facile wet coating method, the LaPO 4 coating layer has been introduced onto the LiNi 0.87 Co 0.09 Al 0.04 O 2 (NCA) surface while a small part of La 3+ has also been doped on the surface to realize the dual functions modification of coating and doping. The morphology and structure of the samples were investigated by XRD, SEM and TEM measurements. The chemical compositions of the samples were analyzed via EDS and XPS data. The results showed that the coating of LaPO 4 and the doping of La 3+ were successfully achieved on the surface of NCA. Electrochemical tests indicate that the sample modified with 2 wt% LaPO 4 (L2-NCA) possesses the best electrochemical performance. After 100 cycles, compared with the capacity retention rate of pristine NCA of 87.1%/74.2% at 0.5 C at 25 °C/60 °C, L2-NCA showed better cycling stability, and the capacity retention rate increased to 96.0%/85.1%, respectively. Besides, the rate performance of the modified samples at 1 C, 2 C and 5 C were also significantly improved. These satisfactory results reveal that the surface modification of LaPO 4 provides a feasible scheme to uprate the performance of Ni-rich cathode materials., (© 2022 IOP Publishing Ltd.)

Due to the assets such as adequate discharge capacity and rational cost, LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA), a high-nickel ternary layered oxide, is regarded to be a favorable cathode contender for lithium-ion batteries. However, the superior commercial application is restricted by the surface residual alkaline lithium salt (LiOH or/and Li 2 CO 3 ) of nickel-rich cathode materials, which will expedite the disintegration of the structure and the engendering of gas (CO 2 ). Therefore, in this paper, we devise and fabricate a Y(PO 3 ) 3 modified LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA), intending to optimize the surface residual alkaline lithium salt (antecedent deportation of H 2 O and CO 2 ) while forming an in situ triple composite Li-ion conductor coating (Y(PO 3 ) 3 -Li 3 PO 4 -YPO 4 ) to enhance the electrochemical behavior. Under this method, the 2 mol% Y(PO 3 ) 3 modified NCA electrode reveals exceptional rate capability (5 C/156.3 mAh g -1 ) and extraordinary cycle stability after 200 cycles (2 C/88.3%), whereas the original sample is only 5 C/123.1 mAh g -1 and 2 C/71.2% after 200 cycles. Conspicuously, even under the draconian circumstances of the high temperature and the high rate at 55 °C/1 C, the 2 mol% Y(PO 3 ) 3 modified NCA electrode sustains a high reversible capacity, with an admirable capacity retention rate of 89.4% after 100 cycles. These contented results signify that the surface remodeling tactic presents a viable scheme for ameliorating high-nickel materials' performance and appropriateness., (© 2022 IOP Publishing Ltd.)

LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA), a promising ternary cathode material of lithium-ion batteries, has widely attracted attention due to its high energy density and excellent cycling performance. However, the presence of residual alkali (LiOH and Li 2 CO 3 ) on the surface will accelerate its reaction with HF from LiPF 6 , resulting in structural degradation and reduced safety. In this work, we develop a new coating material, LiH 2 PO 4 , which can effectively optimize the residual alkali on the surface of NCA to remove H 2 O and CO 2 and form a coating layer with excellent ion conductivity. Under this strategy, the coated sample NCA@0.02Li 3 PO 4 (P2-NCA) provides a capacity of 147.8 mAh g -1 at a high rate of 5 C, which is higher than the original sample (126.5 mAh g -1 ). Impressively, the cycling stabilities of P2-NCA under 0.5 C significantly improved from 85.2% and 81.9% of pristine-NCA cathode to 96.1% and 90.5% at 25 °C and 55 °C, respectively. These satisfied findings indicate that this surface modification method provides a feasible strategy toward improving the performance and applicability of nickel-rich cathode materials., (© 2021 IOP Publishing Ltd.)

NaBH 4 has been considered as one of the most advantageous candidates for chemical hydrogen storage, but it is still a huge challenge to design efficient non-noble-metal catalysts for on-demand hydrogen generation from NaBH 4 hydrolysis. In this paper, we demonstrate for the first time that a spinel FeCo 2 O 4 nanowire array supported on carbon cloth (FeCo 2 O 4 NA/CC) behaves as an efficient earth-abundant catalyst toward NaBH 4 hydrolysis in alkaline solutions with an activation energy of 44.98 kJ mol -1 . Such FeCo 2 O 4 NA/CC offers a hydrogen generation rate of 2551 ml min -1 g -1 under ambient conditions, with good stability and reusability. Its use as an ON/OFF switch for on-demand hydrogen generation is also demonstrated successfully.