posted on 2024-02-05, 21:29authored byXin-ya Bu, Yan-li Zhu, Cong-jie Wang, Wei Li, Yu Xia, Yong Zhao
Thermal
batteries are solid-state, thermally activated batteries
with long storage times and high reliability. FeS2 is used
as a cathode material commonly, but the high internal resistance and
low voltage platform limit the improvement of battery performance.
Herein, the 1T-phase vanadium disulfide (VS2) is prepared
via the scalable hydrothermal method and applied to thermal battery
cathode materials for the first time. 1T-VS2 lamellar flower
clusters have high electronic conductivity (1.583 S cm–1) at room temperature, which is 75 times higher than FeS2 (0.021 S cm–1). Mechanism analysis shows that
1T-VS2@V2O3 can be formed based on
the part of 1T-VS2 being oxidized to V2O3 at the discharge temperature. Benefiting from the synergistic
effect of vanadium sulfide and vanadium oxide as a cathode for thermal
batteries enhanced specific capacity (292.4 mA h g–1) and mass energy density (572.5 W h kg–1) when
cutoff voltage is 1 V. Additionally, the discharge results indicate
that the cells utilizing 1T-VS2 cathodes provided a higher
voltage platform of 2.11 V than 1.84 V for FeS2. This impressive
work can offer a good strategy for boosting cathode materials for
a high-performance thermal battery.