Oz Erdinc, Altin Serdar, Avci Sevda
Physics Department, Ataturk University, Erzurum 25400, Turkey.
Nanoscience and Nanoengineering Department, Ataturk University, Erzurum 25400, Turkey.
ACS Omega. 2023 Jul 22;8(30):27170-27178. doi: 10.1021/acsomega.3c02315. eCollection 2023 Aug 1.
Sodium-ion batteries (SIBs) are the most promising alternative to lithium-ion batteries (LIBs) due to their low cost and environmental friendliness; therefore, enhancing the performance of SIBs' components is crucial. Although most of the studies have focused on single-phase cathode electrodes, these materials have difficulty in meeting the requirements in practice. At this point, composite materials show superior performance due to balancing different structures and are offered as an alternative to single-phase cathodes. In this study, we synthesized a NaMnO/NaMnO composite material in a single step with cobalt substitution. Changes in the crystal structure and the physical and electrochemical properties of the composite and bare structures were studied. We report that even if the initial capacity is slightly lower, the rate and cyclic performance of the 1% Co-substituted composite sample (CO10) are superior to the undoped NaMnO (NMO) and 5% Co-substituted (CO50) samples after 100 cycles. The results show that with the composite cathode phase transformations are suppressed, structural degradation is prevented, and better battery performance is achieved.
钠离子电池（SIBs）因其低成本和环境友好性，成为锂离子电池（LIBs）最具潜力的替代品；因此，提高SIBs组件的性能至关重要。尽管大多数研究都集中在单相阴极电极上，但这些材料在实际应用中难以满足要求。此时，复合材料由于能平衡不同结构而表现出卓越性能，可作为单相阴极的替代品。在本研究中，我们通过钴取代一步合成了NaMnO/NaMnO复合材料。研究了复合材料和裸结构的晶体结构、物理及电化学性质的变化。我们报告称，即使初始容量略低，但1%钴取代的复合样品（CO10）在100次循环后的倍率性能和循环性能优于未掺杂的NaMnO（NMO）和5%钴取代（CO50）的样品。结果表明，复合阴极抑制了相变，防止了结构退化，并实现了更好的电池性能。
