期刊
JOURNAL OF POWER SOURCES
卷 508, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230341
关键词
Li-ion flow batteries; Semi-solid anolytes; Micro-sized SiOx; Robust conductive networks; Single-walled carbon nanotubes
资金
- National Key Research and Development Program of China [2019YFA0705601]
- National Natural Science Foundation of China [21878308]
- Major Program of National Natural Science Foundation of China [21890762]
- Key Deployment Programs of the Chinese Academy of Sciences [ZDRW_CN_2020-1]
- K.C. Wong Education Foundation [GJTD-2018-04]
By constructing robust conductive networks with single-walled carbon nanotubes, the issues of poor electronic conductivity and huge volume change of SiOx anolytes in Li-ion flow batteries are addressed.
Exploring semi-solid anolytes with high volumetric capacity and low potential is of great significance for boosting the energy storage capability of Li-ion flow batteries. Generally, micro-sized SiOx shows promises in fabricating high-capacity anolytes owing to its inherent advantages in specific capacity, processability and cost. However, its poor electronic conductivity and huge volume change result in unexpected issues of loss of electrical connections, structural disintegration, and unstable solid-electrolyte interphase (SEI). Herein, these issues are addressed by constructing robust conductive networks throughout anolytes by employing single-walled carbon nanotubes (SWCNT) as conductive additives. Compared with loose networks constructed by KB, such robust networks can facilitate continuous electrons transport and improve particle integrity. SiOx anolytes with robust networks display an ultrahigh capacity, excellent rate capability, and stable cyclability in static cells. Furthermore, as-prepared anolytes can simultaneously achieve suitable viscosity and superior electronic conductivity. The assembled flow cell demonstrates high volumetric capacities of 74.7-98.0 Ah L-1 under the static test and the feasibility in long-term continuous-flow mode. Our successful demonstration of SiOx semi-solid anolytes may be helpful for the construction of high-energy-density flow batteries.
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