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Boosting the Cycle Life of Aprotic Li–O2 Batteries via a Photo‐Assisted Hybrid Li2O2‐Scavenging Strategy
Small Methods ( IF 12.4 ) Pub Date : 2017-12-11 , DOI: 10.1002/smtd.201700284
Yu Qiao 1, 2 , Yang Liu 1 , Kezhu Jiang 3 , Xiang Li 1, 2 , Yibo He 1, 2 , Qi Li 1 , Shichao Wu 1 , Haoshen Zhou 1, 2, 3
Affiliation  

The development of the nonaqueous Li–O2 battery, a promising candidate for high‐gravimetric‐energy‐storage techniques, is seriously restrained by the high charge overpotential during electrochemical decomposition of insulating Li2O2. Benefiting from the photovoltage, photo‐assisted charging is revealed as a feasible method to reduce the charge potential. However, a long period of illumination will inevitably aggravate the degradation of the electrolyte. Herein, composed of contact‐ion‐pairs (CIPs), a newly introduced superconcentrated electrolyte presents superior stability against parasitic photocatalytic decomposition. More significantly, the conventional and photo‐assisted charging processes are rationally integrated as a unique hybrid strategy, in which the highly polarized charging stage is replaced by the photo‐assisted Li2O2‐scavenging process. By tuning the photocatalysis and Li2O2 electrochemical oxidization, the hybrid Li2O2‐scavenging strategy not only boosts the cycle life of rechargeable Li–O2 batteries but also opens possibilities in designing photocatalysis‐involved rechargeable energy‐storage battery systems.

中文翻译:

通过光辅助混合Li2O2清除策略来延长非质子Li-O2电池的循环寿命

非水Li–O 2电池的发展,它是高重力能量存储技术的有希望的候选者,但由于绝缘Li 2 O 2的电化学分解过程中的高电荷超电势而受到严重限制。受益于光电压,光辅助充电被认为是降低充电电位的一种可行方法。然而,长时间的照明将不可避免地加剧电解质的降解。在此,由接触离子对(CIP)组成的新引入的超浓缩电解质具有出色的抗寄生光催化分解稳定性。更重要的是,常规和光辅助充电过程被合理地整合为一种独特的混合策略,其中高极化充电阶段被光辅助Li 2 O 2清除过程所取代。通过调节光催化作用和Li 2 O 2的电化学氧化,杂化Li 2 O2清除策略不仅可以延长可充电Li–O 2电池的循环寿命,而且为设计涉及光催化的可充电储能电池系统提供了可能性。
更新日期:2017-12-11
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