Currently, high-energy-density battery technologies are expected to have better safety, stability, and sustainability. Recently, Professor Zhou Haoshen and Professor Qiao Yu reported that by adjusting the specific capacity and replacing the lithium metal anode with a graphite intercalation compound, a conceptual prototype of a lithium-ion oxygen battery based on a low-cost dual-carbon electrode structure was proposed. In terms of the negative electrode, the researchers did not use lithium metal, but made a moderate trade-off between specific capacity, practicability, cost, and safety, and adopted typical graphite as the negative electrode. On the cathode side, the researchers outline a high-capacity O2/redox reaction on a carbon nanotube (CNT) cathode. In principle, Li+ participates in the de/intercalation process of the graphite anode and the redox reaction of O2/ on the CNT cathode. However, the poor compatibility between each electrode reaction and candidate electrolytes (usually diethyl ether or conventional carbonates) hinders the realization of this unique dual-carbon battery structure. Therefore, the focus of this design strategy is to rationally adjust/improve electrolyte compatibility. Based on this, a non-flammable fluorinated ether electrolyte is proposed for the first time, which is composed of methylal (DME) and 1,1,2,2-tetrafluoroethylene 2,2,3,3-tetrafluoropropyl ( HFE) (1 :3, v/v) consisted of 1 M bisfluorosulfonimide ( ) in a mixed solvent.
article main points
1) The results of Raman spectroscopy analysis show that the solvation structure of highly coordinated ion pairs is well inherited in high-concentration electrolytes after adding HFE diluent.
2) Electrochemical characterization results show that the solvent co-intercalation in the graphite anode is eliminated, with high capacity (272.1 mAh g-1, based on graphite mass), long lifetime (more than 1 year) and high capacity retention (88.1%). Furthermore, given the ultrahigh reversibility of the graphite anode (mean CE over 99.93%), Li+-O2 coin cells with a depth of discharge (DOD) of 80% and 60% exhibit long cycle lives of 150 and 300 cycles, respectively.
3) The spectral characterization results of the system show that O2/ does not rely on noble metal catalysts to undergo a highly reversible redox reaction at the cathode.
4) Using the electrochemical compatibility of graphite negative electrode and carbon nanotube positive electrode with O2/redox reaction, in engineering, the researchers successfully prepared a high-energy-density pouch battery (302.52 W h kg−1, with a whole pack based on weight).
This novel dual-carbon electrode design not only facilitates large-scale production but also significantly reduces environmental pressure. In addition, the flexibility of the dual carbon electrodes is beneficial to the fabrication of flexible pouch batteries, which has potential application prospects.
refer to
Yang et al., A Safe and -Ion- on a Low-Cost Dual-, Adv. . 2021
DOI: 10.1002/adma.
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