3D Carbon Networks Constructed NaVPO4F/C/rGO as a Cathode Material for High-Performance Sodium-Ion Batteries

Abstract

The fluorophosphate NaVPO 4 F (NVPF) is a good candidate of cathode material for sodium-ion batteries (SIBs) due to its high theoretical specific capacity, high working voltage and stable structure. However, due to the low electronic conductivity of NVPF, its electrochemical properties are difficult to demonstrate. In order to address the insufficient and then enhance its electrochemical performance, a 3D carbon networks constructed NaVPO 4 F/C/rGO (NVPF/C/rGO) nanocomposite is prepared by freeze-drying assisted high-temperature solid-state method. When used as a cathode material for SIBs, the prepared NVPF/C/rGO can deliver a capacity of about 108.7 mA h g −1 at 0.05 C. Moreover, NVPF/C/rGO nanocomposite also exhibits the excellent electrochemical performance, including superior rate capacities (about 65.8 mA h g −1 specific capacity at 10 C) and outstanding cycling performance (∼ 95.1% capacity retention after 200 cycles at 0.05 C), which can be attribute to the 3D carbon networks and the nanoparticles in NVPF/C/rGO nanocomposite. The preliminary results illustrate that the 3D carbon networks constructed NVPF/C/rGO could be a promising cathode material for SIBs.

Freestanding Na3V2O2(PO4)2F/Graphene Aerogels as High-Performance Cathodes of Sodium-Ion Full Batteries

“…With increasing content of GA, the weight loss increases, which is consistent with the initial feeding ratio between GO and NVPF components. Because of the three-dimensional continuous porous network, the content of NVPF in the NVPF/GA 400 hybrid is up to 81 wt %, higher than other NVPF/carbon composites reported . The contents of NVPF are 56, 75, and 84% in NVPF/GA 200, NVPF/GA 300, and NVPF/GA 500, respectively.…”

“…Because of the three-dimensional continuous porous network, the content of NVPF in the NVPF/GA 400 hybrid is up to 81 wt %, higher than other NVPF/carbon composites reported. 52 The contents of NVPF are 56, 75, and 84% in NVPF/GA 200, NVPF/GA 300, and NVPF/GA 500, respectively. A high loading of NVPF would be beneficial for enhancing the energy density of a battery.…”

Phosphate-based cathode materials to boost the electrochemical performance of sodium-ion batteries

“…The carbon network provides faster kinetics of NaVPO 4 F particles and continuous electronic conduction. [79][80][81] The lodging of Na into the as-prepared NaVPO 4 F has not yet been achieved. There are seven explored crystallographic forms of VOPO 4 .…”

“…The carbon network provides faster kinetics of NaVPO 4 F particles and continuous electronic conduction. 79–81…”

Synthesis and Characterizations of Na4MnCr(PO4)3/rGO as NASICON-Type Cathode Materials for Sodium-ion Batteries

“…This proved that the ionic conductivity of NVP/rGO becomes better than that of NVP/C. Guo et al [ 35 ] prepared NaVPO 4 F/C/rGO (NVPF/C/rGO) nanocomposite by a sample freeze-drying method. NVPF was made up of nano-sized particles ranging from 200 nm to 500 nm.…”