期刊
CHEMICAL ENGINEERING JOURNAL
卷 331, 期 -, 页码 712-719出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.09.012
关键词
3D carbonous framework; NASICON structured Na3V2(PO4)(2)F-3; Excellent electronic conductivity; Favorable tap density
资金
- National Natural Science Foundation of China [21503158, 51772240]
- Natural Science Foundation of Shaanxi Province (China) [2014JQ2-2007]
- 111 Project [B14040]
- Fundamental Research Funds for the Central Universities of China [xjj2014044]
NASICON structured Na3V2(PO4)(2)F-3/C@RGO (NVPF/C@RGO) composites with interconnected 3D carbonous framework are composed of NVPF nanoparticles, coating layer of amorphous carbon and RGO nanosheets, where the RGO serves as the main framework. The low carbon content (4.6%) and uniform NVPF nanoparticles supported by the unique 3D carbonous architecture lead to low specific surface area and favorable tap density. By taking full advantage of the interconnected 3D carbonous framework, the excellent electronic conductivity of NVPF/C@RGO is three orders of magnitude higher than that of pristine NVPF/C, resulting in favorable enhanced electrochemical performance. The initial capacity of 124.5 mAh g(-1) at 0.1 C-rate and a high discharge capacity of 119.2 mAh g(-1) with an excellent retention of 90.9% after 700 cycles at 1 C can be attained. Most importantly, NVPF nanoparticles connected with 3D carbonous framework have a low specific surface area, favorable tap density, simple technical procedure, and show great potential to optimize battery performance, apply in large scale energy storage and extend to all polyanion-based cathode materials.
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