Enhancing Na+diffusion dynamics and structural stability of O3-NaMn0.5Ni0.5O2 cathode by Sc and Zn dual-substitution
Sc and Zn were introduced into O3-NaMn0.5Ni0.5O2(NaMN)using the combination of solution combustion and solid-state method.The effect of Sc and Zn dual-substitution on Na+diffusion dynamics and structural stability of NaMN was investigated.The physicochemical characterizations suggest that the introduction of Sc and Zn broaden Na+diffusion channels and weaken the Na—O bonds,thereby facilitating the diffusion of sodium ions.Simulations indicate that the Sc and Zn dual-substitution decreases the diffusion barrier of Na-ions and improves the conductivity of the material.The dual-substituted NaMn0.5Ni0.4Sc0.04Zn0.04O2(NaMNSZ44)cathode delivers impressive cycle stability with capacity retention of 71.2％after 200 cycles at 1C and 54.8％after 400 cycles at 5C.Additionally,the full cell paired with hard carbon anode exhibits a remarkable long-term cycling stability,showing capacity retention of 64.1％after 250 cycles at 1C.These results demonstrate that Sc and Zn dual-substitution is an effective strategy to improve the Na+diffusion dynamics and structural stability of NaMN.
layered oxide cathodeSc and Zn dual-substitutionstructural stabilityNa diffusion dynamics
王彬彬、冯伊铭、罗鑫、黄群、侯子兴、吴雅琴、王鹏宇、齐宇阳、孟庆飞、韦伟峰、周亮君
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中南大学粉末冶金国家重点实验室,长沙 410083
先导科技集团有限公司,广州 510623
中国电子科技集团公司第四十八研究所,长沙 410111
武汉中原长江科技发展有限公司,武汉 430090
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层状氧化物正极 Sc和Zn双取代 结构稳定性 Na+扩散动力学
National Natural Science Foundation of ChinaNatural Science Foundation of Hunan Province,China
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