Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 26, Pages 30766-30775Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c08750
Keywords
Li-O-2 batteries; redox mediator; shuttle effect; chemical binding; MXene; separator modification
Funding
- National Natural Science Foundation of China (NSFC) [51872316]
- Science and Technology Commission of Shanghai Municipality [18DZ2280800]
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A chemical binding strategy based on a MXene-modified separator with a 3D porous hierarchical structure has been developed to suppress the I-3(-) shuttling in LiI-involved Li-O-2 battery. The abundant -OH terminal groups on the MXene surface act as effective binding sites for suppressing the migration of I-3(-), while the 3D porous structure ensures fast transfer of lithium ions, resulting in improved battery performance.
Redox mediators (RMs) have been developed as efficient approaches to lower the charge polarization of Li-O-2 batteries. However, the shuttle effect resulting from their soluble nature severely damages the battery performance, causing failure of the RM and anode corrosion. In this work, a chemical binding strategy based on a MXene-modified separator with a 3D porous hierarchical structure design was developed to suppress the I-3(-) shutting in LiI-involved Li-O-2 battery. As corroborated by experimental characterizations and theoretical calculations, the abundant -OH terminal groups on the MXene surface functioned as effective binding sites for suppressing the migration of I-3(-), while the 3D porous structure ensured the fast transfer of lithium ions. As a result, the Li-O-2 battery with the MXene-modified separator showed no sign of redox shuttling compared with its counterparts in the full discharge/charge tests. In the meantime, the MXene-modified separator based-cell exhibited a stable cycle life up to 100 cycles, which is 3 times longer than the control samples. We believe that this work could provide insights into the development of separator modification for Li-O-2 batteries with RMs.
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