There has been a recent push to develop powerful and safe batteries with enhanced application needs and safety requirements. A new thermoelectric hybrid battery (TEHB) system has been proposed to utilize the battery waste heat, FeS₂ as an example, to further reproduce electricity and decrease temperatures as the battery is discharging and charging. Therefore, the thermoelectric properties of FeS₂ as battery electrode are studied in order to enhance its thermoelectric performance and develop a system to utilize battery heat efficiently and securely. Here, FeS₂ thermoelectric material is firstly prepared with hydrothermal method, followed by second-phase Fe₇S₈ with higher electrical conductivity which was introduced through newly designed annealing process. The results showed that the electrical conductivity of FeS₂ that was annealed at 873 K reached 136 S cm⁻¹ at 300 K and 302 S cm⁻¹ at 648 K. These were two orders of magnitude higher than the other synthesized samples. When Fe₇S₈ nano-crystals were introduced, there was a decrease in lattice thermal conductivity and an increase in Seebeck coefficient. These results are an important step in improving the battery efficiency by converting the unavoidable heat that was generated by battery into electricity.

近来，已经进行了开发具有增强的应用需求和安全要求的功能强大且安全的电池的努力。已经提出了一种新的热电混合电池（TEHB）系统，以电池废热FeS ₂为例，在电池放电和充电时进一步再生电能并降低温度。因此，为了增强FeS ₂的热电性能，研究了FeS ₂作为电池电极的热电性能，并开发了有效且可靠地利用电池热的系统。在这里，首先用水热法制备FeS ₂热电材料，然后用第二相Fe ₇ S ₈制备。通过新设计的退火工艺引入了更高的电导率。结果表明，在873 K下退火的FeS _2的电导率在300 K时达到136 S cm ^-1，在648 K时达到302 S cm ^-1。这比其他合成样品高两个数量级。当引入Fe ₇ S ₈纳米晶体时，晶格热导率降低，塞贝克系数升高。这些结果是通过将电池产生的不可避免的热量转化为电能来提高电池效率的重要步骤。