Mohammad Reza Esmaeili, Saba Noorsina, Sayed Khatiboleslam Sadrnezhaad
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引用次数: 0
Abstract
In the quest for improved battery performance, high entropy transition metal oxides (HEO-TM) have emerged as potential candidates for lithium-ion battery (LIB) anodes due to their high capacity resulting from multi-electron transfer redox reactions. This study a synthesized spinel high-entropy oxide (VCrNiCoMn)3O4 using a surfactant-assisted hydrothermal method and subjected it to annealing at different temperatures. XRD analysis revealed that the stabilized spinel phase formed at 1223 K. The (VCrNiCoMn)3O4 demonstrated a significant discharge capacity of 1269 mAh g−1, accompanied by a charge capacity of 1030 mAh g−1. After 1000 cycles, it achieved a reversible capacity of 733 mAh g−1. Furthermore, superior rate performance was observed, demonstrating a high reversible capacity of 394 mAh g−1 at a scanning rate of 2 mV s−1. The superior performance was attributed to multivalent species, including vanadium, which stabilizes charge transfer, facilitates redox reactions, enhances electrical properties, and improves structural stability. Vanadium's ability to transition through multiple oxidation states reduce volume expansion, improve structural rigidity, and contribute to cycling stability. Moreover, Kinetic analysis showed that the lithiation reaction was dominated by the Faraday mechanism, while delithiation involved both capacitive and Faraday contributions. These results suggest that incorporating vanadium into high-entropy oxides can optimize electrochemical properties for long-life lithium-ion batteries.
为了提高电池性能,高熵过渡金属氧化物(HEO-TM)因其多电子转移氧化还原反应产生的高容量而成为锂离子电池(LIB)阳极的潜在候选材料。本研究采用表面活性剂辅助水热法合成了尖晶石高熵氧化物 (VCrNiCoMn)3O4,并在不同温度下对其进行退火处理。XRD 分析表明,稳定的尖晶石相在 1223 K 时形成。(VCrNiCoMn)3O4 的放电容量高达 1269 mAh g-1,充电容量为 1030 mAh g-1。经过 1000 次循环后,其可逆容量达到 733 mAh g-1。此外,它还具有卓越的速率性能,在 2 mV s-1 的扫描速率下,可逆容量高达 394 mAh g-1。卓越的性能归功于包括钒在内的多价物种,它们能稳定电荷转移、促进氧化还原反应、增强电性能并提高结构稳定性。钒能够在多个氧化态之间转换,从而减少了体积膨胀,提高了结构刚性,并有助于提高循环稳定性。此外,动力学分析表明,锂化反应由法拉第机制主导,而脱锂化反应则涉及电容和法拉第机制。这些结果表明,在高熵氧化物中加入钒可以优化长寿命锂离子电池的电化学特性。
期刊介绍:
Journal of energy storage focusses on all aspects of energy storage, in particular systems integration, electric grid integration, modelling and analysis, novel energy storage technologies, sizing and management strategies, business models for operation of storage systems and energy storage developments worldwide.