Quasi–solid state rechargeable Na-CO 2 batteries with reduced graphene oxide Na anodes

• DOI: 10.1126/sciadv.1602396
• Publication Date: 2017-02-02T02:10:21Z
• Authors: Xiaofei Hu; Zifan Li; Yaran Zhao; Jianchao Sun; Qing Zhao; Jianbin Wang; Zhanliang Tao; Jun Chen
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy; 01 natural sciences; Research Articles; 3. Good health; 0104 chemical sciences

Na-CO2 batteries using earth-abundant Na and greenhouse gas CO2 are promising tools for mobile stationary energy storage, but they still pose safety risks from leakage of liquid electrolyte instability the metal anode. These issues result in extremely harsh operating conditions increase difficulty scaling up this technology. We report development quasi-solid state with high composite polymer (CPE) reduced graphene oxide (rGO) anodes. The CPE PVDF-HFP [poly(vinylidene fluoride-co-hexafluoropropylene)]-4% SiO2/NaClO4-TEGDME (tetraethylene glycol dimethyl ether) has ion conductivity (1.0 mS cm-1), robust toughness, a nonflammable matrix, strong electrolyte-locking ability. In addition, rGO-Na anode presents fast nondendritic Na+ plating/stripping (5.7 to 16.5 mA cm-2). improved kinetics enable constructed rGO-Na/CPE/CO2 successfully cycle wide partial pressure window (5 100%, simulated car exhaust) especially run 400 cycles at 500 g-1 fixed capacity 1000 mA·hour pure CO2. Furthermore, we scaled reversible 1.1 A·hour pouch-type (20 × 20 cm, 10 g, 232 Wh kg-1). This study makes an attractive prospect.