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A flexible polymer-based Li–air battery using a reduced graphene oxide/Li composite anode

Author:
Guo, Ziyang, Li, Jinli, Xia, Yuan, Chen, Chao, Wang, Fengmei, Tamirat, Andebet Gedamu, Wang, Yonggang, Xia, Yongyao, Wang, Lei, Feng, Shouhua
Source:
Journal of materials chemistry 2018 v.6 no.14 pp. 6022-6032
ISSN:
2050-7496
Subject:
additives, air, anodes, batteries, deformation, electric potential difference, electrolytes, electronics, energy density, gels, graphene oxide, mass density, polymers, protective effect, relative humidity, silica, volatilization
Abstract:
Flexible Li–air batteries have been proposed as a potential power source for next-generation flexible electronics due to their super-high theoretical energy density. However, the safety problems derived from dendritic-deposition and high-activity of a Li anode and the leakage and volatilization of liquid electrolyte severely impede their practical application. Herein, we design a flexible belt-shaped Li–air battery with high stability and safety, which is constructed by using a reduced graphene oxide (rGO)/Li anode, gel polymer electrolyte containing LiI and 4 wt% SiO₂ (4% SiO₂–LiI-GPE). The rGO/Li anode shows lower mass density, better toughness and less dendrite growth compared with a pure Li anode. Additionally, 4% SiO₂–LiI-GPE has a high ionic conductivity of 1.01 mS cm⁻¹, flame-resistant polymer matrix, excellent protective effect on the Li anode and no-leakage properties. Furthermore, the synergy of the LiI and SiO₂ additives promotes the decomposition of discharge products and improves the safety of the battery at the same time. As a result, this belt-shaped Li–air battery can steadily run for 100 cycles with a small average overpotential of ∼1.45 V in ambient air (relative humidity of 15%) under different mechanical deformations. Moreover, its voltage curves over operation could remain almost unchanged under a series of bending conditions.
Agid:
6187061