Synergistic electronic and ionic enhancement of nickel hexacyanoferrate for robust sodium-ion battery performance under extreme conditions
Jiabao Li,
Zhushun Zhang,
Quan Yuan,
Tianyi Wang,
Likun Pan,
Jinliang Li,
Chengyin Wang
Affiliations
Jiabao Li
Institute of Innovation Materials and Energy, School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China; Corresponding authors.
Zhushun Zhang
Institute of Innovation Materials and Energy, School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
Quan Yuan
Institute of Innovation Materials and Energy, School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
Tianyi Wang
Institute of Innovation Materials and Energy, School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
Likun Pan
Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China; Corresponding authors.
Jinliang Li
Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics, College of Physics & Optoelectronic Engineering, Jinan University, Guangzhou 510632, China
Chengyin Wang
Institute of Innovation Materials and Energy, School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China; Corresponding authors.
Sodium-ion batteries (SIBs) often face performance limitations under stringent conditions, such as low temperatures and overcharge/overdischarge scenarios, primarily due to the inadequacies of cathode materials. Nickel hexacyanoferrate (NiHCF) has emerged as a promising candidate due to its zero-strain ion-insertion characteristic and efficient ionic diffusion pathways. However, its practical application is hindered by inadequate ionic and electronic conductivity. In this study, we address these challenges by enhancing the electronic conductivity of NiHCF through the incorporation of multi-walled carbon nanotubes (MWCNTs). This strategic integration not only leverages NiHCF’s zero-strain ion-insertion property but also significantly improves electron and ion transport. As a result, the modified NiHCF/MWCNT composite demonstrates superior electrochemical performance, exhibiting enhanced robustness and efficiency, making it suitable for large-scale energy storage applications. Under a current density of 10 A g−1 at 25℃, the NiHCF/MWCNT composite maintains stable cycling for up to 5000 cycles, with a notable specific capacity of 59.33mAhg−1. Even at −20 ℃, it continues to deliver robust cycling for 5000 cycles at 10 A g−1. Remarkably, after overcharging to 4.25 V and overdischarging to 1.2 V at both 25 ℃ and −20 ℃, the NiHCF/MWCNT electrode still maintains robust cycling performance. This advancement not only addresses the current limitations of electrode materials under extreme conditions but also offers a scalable and practical approach to improving sustainable energy storage technologies.
