Unique synthesis of sandwiched graphene@(Li_0.893Fe_0.036)Co(PO₄) nanoparticles as high-performance cathode materials for lithium-ion batteries

Abstract

Herein, the unique two-layered sandwiched graphene@(Li0.893Fe0.036)Co(PO4) nanoparticles, which presents outstanding electrochemical performances, have been successfully fabricated through the template-sacrificial method.

Template-directed fabrication of 3D graphene-based composite and their electrochemical energy-related applications

“…Owing to the designed structure and Fe doping, this LiFe 0.2-Co 0.8 O 2 -based composite has delivered a specific capacity of 115 mAh/g at 10°C and 97.2 % capacity has been remained after 250 cycles at 0.1°C [38]. The (Li 0.893 Fe 0.036 )Co(PO 4 )-based composite has delivered a capacity of 85 mAh/g at 20°C, and the capacity retention has been *94.6 % after 100 cycles [25].…”

“…For example, during the annealing process at 720°C, the addition of LiOHÁH 2 O would react with the amorphous carbon-coated Fe-doped (NH 4 ) 2 Co 8 (CO 3 ) 6 (OH) 6 Á4H 2 O, forming LiFe 0.2 Co 0.8 O 2 NPs encapsulated inside graphene-like thin carbon films [38], while the addition of LiH 2 PO 4 during the annealing would result in (Li 0.893 Fe 0.036 )Co(PO 4 ) NPs encapsulated inside the multilayer graphene-like carbon thin film (Fig. 2c) [25]. Owing to the designed structure and Fe doping, this LiFe 0.2-Co 0.8 O 2 -based composite has delivered a specific capacity of 115 mAh/g at 10°C and 97.2 % capacity has been remained after 250 cycles at 0.1°C [38].…”

 

“…LiCoPO 4 has flat high potential, good theoretical capacity and smaller structure volume change. [122] Wang et al [123] synthesized two-layer sandwiched graphene@(Li 0.893 Fe 0.036 )Co(PO 4 ) nanoparticles as a lithium-ion battery cathode, displaying very promising performance in terms of rate performance (discharge capacity of 85 mAhg -1 at 20 C), cyclability (coulombic efficiency of around 92.6%), stability (capacity retention of 94.6% after 100 cycles) and fast kinetics.…”

A Facile Way To Synthesize Carbon-Coated LiMn0.7Fe0.3PO4/Reduced Graphene Oxide Sandwich-Structured Composite for Lithium-Ion Batteries

“…Graphene, a single atomic monolayer of graphite, has been found a variety of applications in energy conversion and storage devices due to the excellent properties such as high carrier mobility (∼10,000 cm 2 V –1 s –1 at room temperature), structural flexibility, chemical and thermal stability, mechanical strength, and ultrahigh theoretical specific surface area (2630 m 2 g –1 ). − Combined graphene with LiMPO 4 (M = Fe, Mn, and Co) to make three-dimensional conductive networks has been demonstrated to improve the charge–discharge rate performance for LIBs. − Previous works show that the most are focusing on the synthesis of LiMPO 4 @graphene composite by graphene encapsulated, anchored, or mixed model. , …”