Mg-doped Li-rich vanadium phosphate Li9V3(P2O7)3(PO4)2 as cathode for lithium-ion batteries: electrochemical performance and lithium storage mechanism

Yao, Hanyu; Chen, Da; Zhang, Jun; He, Dannong; Chen, Ming; Zhou, Zhen; Zhao, Yanming; Kuang, Quan; Fan, Qinghua; Dong, Youzhong

doi:10.1007/s10008-021-04995-x

Cited by 4 publications

(4 citation statements)

References 25 publications

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“…Moreover, after 500 cycles the capacity retention of NP-1 and NP-5 are 69.3% and 65.7% respectively, which means neither a small amount of PO 4− doped in NP-1 nor a large amount of PO 4− doped in NP-5 are helpful to stabilize the structure. 45 Clearly, NP-3 also shows a great discharge capacity at 0.5 and 5C in Figure S6 in the Supporting Information. NP-3 clearly shows a higher discharge capacity of 193.4 mAh g −1 after 200 cycles at 0.5C and 126.17 mAh g −1 after 600 cycles at 5C.…”

Section: Resultsmentioning

confidence: 96%

“…Figure c shows that NP-3 delivers a high discharge capacity of 211.5 mAh g –1 at 1C; it still can reach 159.5 mAh g –1 with a capacity retention of 75%, even after 500 cycles, which is much better than Co-free LLO fade to 143.6 mAh g –1 with the capacity retention of 65%. Moreover, after 500 cycles the capacity retention of NP-1 and NP-5 are 69.3% and 65.7% respectively, which means neither a small amount of PO 4– doped in NP-1 nor a large amount of PO 4– doped in NP-5 are helpful to stabilize the structure . Clearly, NP-3 also shows a great discharge capacity at 0.5 and 5C in Figure S6 in the Supporting Information.…”

Section: Results and Discussionmentioning

confidence: 99%

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Surface Spinel-Coated and Polyanion-Doped Co-Free Li-Rich Layered Oxide Cathode for High-Performance Lithium-Ion Batteries

Chang

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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Li-rich layered oxides (LLOs) are supposed to be the most competitive cathode materials for lithium-ion batteries (LIBs), because of the high theoretical specific capacities (>250 mAh g −1 ). However, there are some inherent inferiorities, such as the low initial Coulombic efficiency (ICE) and the rapid capacity/voltage decay, that hinder the large-scale commercial applications of LLOs. Herein, we successfully obtained spinel-coated and phosphate-doped Co-free Li-rich layered oxides (Co-free LLOs) by cotreatment methods, using weakly acidic and alkalinity (NH 4 H 2 PO 4 solution), which could effectively improve the electrochemical performance. The spinel coating could not only accelerate the movement of Li + but also restrain O 2 release, while the doping PO 4 3− could inhibit the transition-metal (TM) migration between the oxygen octahedral site and the oxygen tetrahedral site. The optimized Co-free LLOs cathode treated with 3% NH 4 H 2 PO 4 solution could deliver a high ICE of 88% and a high discharge capacity up to 159.5 mAh g −1 after 500 cycles at 1C (1C = 250 mA g −1 ). Moreover, the voltage fading decreases from 0.64 mV to 0.32 mV per cycle during cycling. This work provides new insights for developing high-performance Co-free LLOs cathode materials.

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Section: Resultsmentioning

confidence: 96%

Section: Results and Discussionmentioning

confidence: 99%

Surface Spinel-Coated and Polyanion-Doped Co-Free Li-Rich Layered Oxide Cathode for High-Performance Lithium-Ion Batteries

Chang

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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“…The smaller radius of Ni 2+ will make the lattice structure of the pristine NVP phase smaller with successful substitution of Ni 2+ for V 3+ . In previous studies, we have found that sodium ions are mainly diffused in the internal space with a curved trajectory, and thus the compressive structure of VO 6 octahedrons by Ni 2+ doping can widen the space for Na + migration. − Furthermore, the replacement of Ni 2+ for V 3+ will lead to the stoichiometric oxidation of V 3+ to V 4+ due to the charge imbalance of Ni 2+ and V 3+ , which largely enhances the electronic conductivity of the NVP structure by charge compensation. , As V 4+ has a smaller radius ( r = 0.58 Å), the formation of mixed valence (V 4+ /V 3+ ) would facilitate structural aberration. The faintly twisted lattice structure may induce some structural defects that may be beneficial for electrochemical reactions.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Na-Ion Storage of the NASICON Cathode through Synergistic Bulk Lattice Modulation and Porous Architecture

Guo,

Zhang,

et al. 2023

Energy Fuels

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A NASICON-type Na3V2(PO4)3 cathode, known for its stable three-dimensional Na+ diffusion channels, has been recognized as a prevailing candidate for sodium-ion batteries. However, the practical implementation of this cathode has been hindered by severe capacity degradation and inferior rate capability, resulting from its intrinsic poor electronic conductivity. Here, this work reports Ni2+ doping Na3V2(PO4)3 materials accompanied by hierarchical porous morphology to strengthen ion migration and improve electronic conductivity. Owing to the porous structure and lattice modulation, the as-synthesized material displays a large surface area, short transport distance, easy electrolyte infiltration, and rapid electron/ion transportation. These multiple effects contribute to the superior rate and cycling stabilities of the modified NVP compared to those of its bare counterpart. When explored as a cathode for SIB, the NVP-Ni0.05 exhibits impressive rate capability (88.1 mAh g–1 at 20C) and excellent cycling stability (93.8% capacity retention after 1500 cycles at 10C). This study provides a feasible strategy for developing a high-rate and long cycle-life electrode material and could motivate researchers to develop other sodium-based cathode materials.

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“…[6][7][8][9] Its unique kagome lattice structure has made it a subject of study for exploring interplay among various physical properties, with recent findings shedding light on its magnetic and transport properties. [5,10,11] Some researchers reported on the lowtemperature magnetism of Li 9 Fe 3 (P 2 O 7 ) 3 (PO 4 ) 2 (S = 5/2), which exhibits an antiferromagnetic long-range order developing at T N = 1.3 K and a crossover from a paramagnet to a classical spin-liquid phase at approximately 5 K. [10] Additionally, the weak magnetic interaction allows for the observa-tion of the 1/3 magnetization plateau under a stable field near B = 4.75 T, providing valuable opportunities to explore classical and quantum fluctuations effects with zero and applied fields of the Heisenberg antiferromagnetic model. Another material in this family, Li 9 V 3 (P 2 O 7 ) 3 (PO 4 ) 2 (S = 1), exhibits distinct properties.…”

Section: Introductionmentioning

confidence: 99%

Spin reorientation in easy-plane kagome ferromagnet Li₉Cr₃(P₂O7)₃(PO₄)₂

Yuanhao

Liu

et al. 2023

Chinese Phys. B

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We report the successful growth and characterization of Li$_9$Cr$_3$(P$_2$O$_7$)$_3$(PO$_4$)$_2$ single crystal, and investigate its magnetic properties under external magnetic fields via magnetization and heat capacity measurements. Our study reveals that Li$_9$Cr$_3$(P$_2$O$_7$)$_3$(PO$_4$)$_2$ is an easy-plane kagome ferromagnet with S = 3/2, as evidenced by the Curie-Weiss temperature of 6 K which implies a ferromagnetic exchange coupling in the material. Under zero magnetic field, Li$_9$Cr$_3$(P$_2$O$_7$)$_3$(PO$_4$)$_2$ undergoes a magnetic transition at T C = 2.7 K from a paramagnetic state to a ferromagnetically ordered state with the magnetic moment lying in the kagome plane. By applying a c-axis directional magnetic field to rotate the spin alignment from the kagome plane to the c-axis, we observe a reduction in the magnetic transition temperature as the field is increased. We construct a magnetic phase diagram as a function of temperature and magnetic field applied parallel to the c-axis of Li$_9$Cr$_3$(P$_2$O$_7$)$_3$(PO$_4$)$_2$ and find that the phase boundary is linear over a certain temperature range. Regarding that theoretically, the field-induced phase transition of the spin reorientation in the easy-plane ferromagnet can be viewed as the ferromagnetic magnon Bose-Einstein condensation, the phase boundary scaling of field-induced (B||C) magnetic transition in Li$_9$Cr$_3$(P$_2$O$_7$)$_3$(PO$_4$)$_2$ can be described as the quasi-2D magnon BEC, which has been observed in other ferromagnetic materials such as K2CuF4.

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Mg-doped Li-rich vanadium phosphate Li9V3(P2O7)3(PO4)2 as cathode for lithium-ion batteries: electrochemical performance and lithium storage mechanism

Cited by 4 publications

References 25 publications

Surface Spinel-Coated and Polyanion-Doped Co-Free Li-Rich Layered Oxide Cathode for High-Performance Lithium-Ion Batteries

Surface Spinel-Coated and Polyanion-Doped Co-Free Li-Rich Layered Oxide Cathode for High-Performance Lithium-Ion Batteries

Enhanced Na-Ion Storage of the NASICON Cathode through Synergistic Bulk Lattice Modulation and Porous Architecture

Spin reorientation in easy-plane kagome ferromagnet Li₉Cr₃(P₂O7)₃(PO₄)₂

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Mg-doped Li-rich vanadium phosphate Li9V3(P2O7)3(PO4)2 as cathode for lithium-ion batteries: electrochemical performance and lithium storage mechanism

Cited by 4 publications

References 25 publications

Surface Spinel-Coated and Polyanion-Doped Co-Free Li-Rich Layered Oxide Cathode for High-Performance Lithium-Ion Batteries

Surface Spinel-Coated and Polyanion-Doped Co-Free Li-Rich Layered Oxide Cathode for High-Performance Lithium-Ion Batteries

Enhanced Na-Ion Storage of the NASICON Cathode through Synergistic Bulk Lattice Modulation and Porous Architecture

Spin reorientation in easy-plane kagome ferromagnet Li9Cr3(P2O7)3(PO4)2

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Spin reorientation in easy-plane kagome ferromagnet Li₉Cr₃(P₂O7)₃(PO₄)₂