Nanoporous carbon leading to the high performance of a Na3V2O2(PO4)2F@carbon/graphene cathode in a sodium ion battery. Issue 30 (11th July 2017)

• Record Type: Journal Article
• Authors: Jin, Hongyun; Liu, Min; Uchaker, Evan; Dong, Jie; Zhang, Qifeng; Hou, Shuen; Li, Jiangyu; Cao, Guozhong
• Is Part Of: CrystEngComm. Volume 19:Issue 30(2017)
• Page Start: 4287
• Page End: 4293
• Publication Date: 2017-07-11
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c7ce00726d
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : The Na3 V2 O2 (PO4 )2 F/graphene sandwich cathode has attracted great attention as a potential candidate for sodium-ion batteries in view of its high capacity and good cycling ability. Abstract : The Na3 V2 O2 (PO4 )2 F/graphene sandwich cathode has attracted great attention as a potential candidate for sodium-ion batteries in view of its high capacity and good cycling ability. However, a big issue for Na3 V2 O2 (PO4 )2 F/graphene is its extremely poor electronic conductivity due to the multilayer structure in which Na3 V2 O2 (PO4 )2 F particles are located between the graphene layers. We introduced carbon in the Na3 V2 O2 (PO4 )2 F/graphene sandwich to form a 3D architecture – Na3 V2 O2 (PO4 )2 F@carbon/graphene (NVPF@C/G). A battery with the NVPF@C/G cathode presents good electrochemical properties, a high capacity, 135.8 mAh g −1 at 0.1C, with a capacity retention of 96.8% at 2C for fifty cycles. NVPF@C/G showed obvious advantage in the rate performance and cycle stability compared with the NVPF/G sandwich, which indicated that the nanoporous carbon integrated in the 3D structure plays a crucial role in improving the electrochemical performance. It is anticipated that such a new method of introducing nanoporous carbon for battery performance enhancement can be extended to other graphene-based sandwich structure electrodes.