Optimizing the Performance of a Graphitized Carbon Xerogel as Cathode for Sodium Dual-Ion Batteries

被引：12
作者：
Camean, Ignacio [1 ]
Lobato, Belen [1 ]
Rey-Raap, Natalia [1 ]
Dos Santos-Gomez, Lucia [2 ]
Flores-Lopez, Samantha [1 ]
Arenillas, Ana [1 ]
Garcia, Ana Beatriz [1 ]
机构：
[1] INCAR CSIC, Inst Ciencia & Tecnol Carbono, Francisco Pintado Fe 26, Oviedo 33011, Spain
[2] Univ Malaga, Dept Quim Inorgan Cristalograf & Mineral, Malaga 29071, Spain
来源：
CHEMELECTROCHEM | 2023年 / 10卷 / 07期
关键词：
Carbon xerogel; Cathode; PF6- anion intercalation; Sodium dual-ion battery; INTERCALATION; POROSITY;
D O I：
10.1002/celc.202201069
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The objective of this study is to optimize the performance of a graphitized carbon xerogel doped with graphene oxide (GXGO) as cathode for sodium dual-ion batteries. Carbon xerogels are synthetic materials produced in large amounts, with well-controlled chemistry, porosity and structure, by a simple and fast microwave process that has been scaled-up. The intercalation of PF6- anions from various NaPF6 salt-based electrolytes in a GXGO-based cathode is investigated by considering the influence of the upper cut-off voltage (UCOV) and of the electrolyte on the electrochemical parameters. The best results were attained in an electrolyte with a 2.0 M NaPF6 concentration in EC : EMC carbonate solvent mixture with added FEC, at a UCOV of 5.0 V. GXGO cathode provides a discharge capacity of 47 mAh g(-1) after 2500 cycles with a coulombic efficiency of 97 %. Moreover, it shows great cycling stability and capacity retention of essentially 100 % after the initial cycles.
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页数：7
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