期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 27, 页码 30839-30846出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c06146
关键词
ion motor; pump-free flow battery; electrolyte flow; Zn-Ni prototype battery; dendrite growth
资金
- National Key Research and Development Program of China [2019YFC1908304]
- National Natural Science Foundation of China [21676022, 21706004]
- Fundamental Research Funds for the Central Universities [BHYC1701A]
This article introduces a new concept of ion motors, which can realize the directional driving and uniformity of the electrolyte, thereby solving the concentration polarization and dendrite problems in metal secondary batteries and flow batteries.
The quiescent electrolyte causes serious concentration polarization and dendrite problems during the charging and discharging of the battery, which restricts the development of metal secondary batteries and flow batteries. Herein, we report a new concept of ion motors, with which the directional driving and uniformity of the electrolyte are realized to eliminate the concentration polarization and dendritic phenomenon for secondary metal batteries and flow batteries without additional external energy. In this study, a dendrite-free secondary metal battery with ion motors is constructed to eliminate a considerable concentration polarization voltage by a tiny induced counter electromotive force generated by Lorentz force, significantly improving the output power and energy efficiency of the battery. An actual pump-free flow battery with an ion motor is also assembled, which overcomes the problems of low energy efficiency and the complex structure caused by the traditional flow battery requiring 1-2 pumps to drive the electrolyte. The efficiency of ion motors to drive the electrolyte is hundreds of times higher than that of the mechanical pump. Therefore, the ion motor provides a universal strategy for designing more pump-free flow batteries and metal secondary batteries without the risk of dendrites in the future.
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