Abstract
• NiS 2 with nano/micro-nano structure were successfully synthesized. • Structures control interfacial infiltration was demonstrated in thermal battery. • Sintering treatment of electrode powder increases interfacial infiltration. • Micro-nano NiS 2 is not suitable for high power thermal battery. Interfacial infiltration between cathode materials and ionic conduction additive is a key factor for reducing contact resistance in thermal battery. And structure of cathode materials has a huge impact on interfacial infiltration. Hence, NiS 2 with nano structure, globular micro-nano structure and three dimensional micro-nano hierarchical structure are synthesized and used as cathode materials of high power thermal battery. A sintering treatment similar to the hot-pressing of powder is used to improve the infiltration between cathode materials and solid molten salt. The pulse test results show that nano NiS 2 electrode has minimum resistance, which means nanocrystallization is beneficial to improve interfacial infiltration. Further studies indicate that microvoid of micro-nano hierarchical structures is not filled by solid molten salt electrolyte, which obstructs transmission of electronic and Li + , and sintering treatment could improve interfacial infiltration. The nano NiS 2 cathode has excellent specific capacity with 484.2 mAh g − 1 under 0.2 A cm −2 after sintering treatment, which is higher than 431.7 mAh g − 1 of globular micro-nano NiS 2 and 271.2 mAh g − 1 of three dimensional micro-nano NiS 2 cathodes. The discharge results further show that hierarchical structures do not apply to the high power thermal battery based on non-flowing character of molten salt under the natural condition.
Published Version
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