[100]-Oriented LiFePO₄ Nanoflakes toward High Rate Li-Ion Battery Cathode

Abstract

[100] is believed to be a tough diffusion direction for Li(+) in LiFePO4, leading to the belief that the rate performance of [100]-oriented LiFePO4 is poor. Here we report the fabrication of 12 nm-thick [100]-oriented LiFePO4 nanoflakes by a simple one-pot solvothermal method. The nanoflakes exhibit unexpectedly excellent electrochemical performance, in stark contrast to what was previously believed. Such an exceptional result is attributed to a decreased thermodynamic transformation barrier height (Δμb) associated with increased active population.

Chemical Synthesis of 3D Graphene‐Like Cages for Sodium‐Ion Batteries Applications

“…Even at the rates larger than 20 C, the plateaus still can be clearly presented. The result even compares well with the current stateof-the-art cathodes such as LiNi 0.5 Mn 0.5 O 2 , [54] LiFePO 4 /C, [56] LiFePO 4 nanoflakes, [57] amorphous FePO 4 , [58] Na 3 Ni 2 SbO 6 , [59] Na 3 V 2 (PO 4 ) 2 F 3 , [60] Na 2 Fe 2 (SO 4 ) 3 , [23] and Na 3 V 2 (PO 4 ) 2 /C/rGO. The polarization is much smaller than those for the NVP-NPs and NVP-BPs electrodes (Figures S13b, S14b, and Table S1, Supporting Information).…”

“…Even at an ultrahigh rate of 200C, a reversible capacity of 75.9 mA h g −1 is available. c) Cycling performance at the current density of 1 C. d) Rate capability and the corresponding e) galvanostatic discharge profiles at various current densities from 1 C to 200 C. f) Ragone plots of our NVP-NFs cathode, compared with some advanced LIBs and SIBs cathode materials (LiNi 0.5 Mn 0.5 O 2 ‖Li, [54] LiFePO 4 /C‖Li, [56] LiFePO 4 nanoflakes‖Li, [57] amorphous FePO 4 ‖Li, [58] Na 3 Ni 2 SbO 6 ‖Na, [59] Na 3 V 2 (PO 4 ) 2 F 3 ‖Na, [60] Na 2 Fe 2 (SO 4 ) 3 ‖Na, [23] and Na 3 V 2 (PO 4 ) 2 /C/rGO‖Na). [54,55] Notably, even after long cycles with different rates, when the current rate is reverted to 1 C, a high discharge capacity of 114.5 mA h g −1 (99.4% of the initial capacity) is recovered.…”

Precursor‐Directed Nucleation and Self‐Assembly Growth: From Hollow Microprisms to Nanoplatelets

“…In contrast, the state‐of‐the‐art reasoning argues that ultrathin [100]‐oriented LFP facilitates the single‐phase transformation and consequently is beneficial for the increase in active particles . Recently, [100]‐oriented LFP ultrathin nanoplatelets with a statistic thickness of 12 nm were synthesized under a water‐deficit acidic condition in our laboratory . The ultrathin nanoplatelets exhibited excellent electrochemical performance.…”

Battery thermal management with phase change materials (PCMs)

“…LiNi1-x-yCoxMnyO2 combines the advantages of three elements, which has the advantages of large specific capacity, outstanding cycle performance and moderate price of cost, while it has the disadvantages of poor material surface stability due to property of hard oxidation of divalent Ni. LiFePO4 has the advantages of good cycle performance, good security performance but it has low mix conductivity, low energy density and poor rate performance [4] . The comparison of different cathode materials for lithium-ion batteries is listed below.…”