title: Rechargeable Room-Temperature Na-CO2 Batteries.
abstract: Developing rechargeable Na-CO2 batteries is significant for energy conversion and utilization of CO2 . However, the reported batteries in pure CO2 atmosphere are non-rechargeable with limited discharge capacity of 200 mAh g(-1) . Herein, we realized the rechargeability of a Na-CO2 battery, with the proposed and demonstrated reversible reaction of 3 CO2 +4 Na↔2 Na2 CO3 +C. The battery consists of a Na anode, an ether-based electrolyte, and a designed cathode with electrolyte-treated multi-wall carbon nanotubes, and shows reversible capacity of 60000 mAh g(-1) at 1 A g(-1) (≈1000 Wh kg(-1) ) and runs for 200 cycles with controlled capacity of 2000 mAh g(-1) at charge voltage <3.7 V. The porous structure, high electro-conductivity, and good wettability of electrolyte to cathode lead to reduced electrochemical polarization of the battery and further result in high performance. Our work provides an alternative approach towards clean recycling and utilization of CO2 .
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education.|State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China.
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Hu
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education.|State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China.
authors.forename: Jianchao
authors.initials: J
authors.lastname: Sun
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education.|State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China.
authors.forename: Zifan
authors.initials: Z
authors.lastname: Li
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education.|State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education.|State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China.
authors.forename: Chengcheng
authors.initials: C
authors.lastname: Chen
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry, Ministry of Education. chenabc@nankai.edu.cn.|State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China. chenabc@nankai.edu.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
keywords: 3-dimensional porosity; CO2 utilization; Na-CO2 batteries; cathode design; multi-wall carbon nanotubes