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JOURNAL OF POWER SOURCES · 2022 · IF 9.794

NaClO4 as an effective electrolyte additive for high-energy Li-ion batteries

Yi-Xuan Li,Xiang Ding,Fei Chen,Kuo Cao,Chun-Hua Chen

NaClO 4 is utilized as a salt-type electrolyte additive to improve the electrochemical performance in both Li-rich/graphite full cells and Li-rich/Li half cells. The corresponding characterizations such as scanning electron microscopy and X-ray photoelectron spectroscopy reveal that the NaClO 4 -added electrolyte can suppress the transition metal dissolution from Li-rich cathode and form a stable conductive cathode electrolyte interface layer to protect Li-rich cathode and promote Li + ions transfer. A small amount (0.1 wt%) of NaClO 4 additive enables Li-rich/graphite full cells to maintain 86% capacity after 50 cycles and Li-rich/Li half cells to maintain 95% capacity after 100 cycles, showing a great application potential.

研究领域: 电化学 · 材料科学 · 能源存储 · 电池技术 · 功能材料

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JOURNAL OF POWER SOURCES · 2024 · IF 8.1

Enhanced electrochemical performance of a cost-effective Sm2O3-coated spinel LiNi0.5Mn1.5O4 cathode for high-voltage lithium-ion batteries

Zhengwu Wang,Yannan Zhang,Bao Zhang,Dong Yang,Kai Zhou,Yixue Huang,Fei Wang,Jianguo Duan,Xianshu Wang,Peng Dong,Yingjie Zhang

Spinel LiNi 0.5 Mn 1.5 O 4 (LNMO) has gained significant attention as a promising cathode material for lithium-ion batteries due to its high working voltage (>4.7 V) and energy density . However, challenges such as electrolyte decomposition-induced material interface erosion and transition metal dissolution under high operating voltage hinder its commercial use. In this study, a thin and uniform Sm 2 O 3 layer has been successfully deposited on the surface of LNMO using a wet chemical method . A comprehensive investigation of surface morphology , crystal structure, and electrochemical performance of the modified LNMO is conducted. The results demonstrate that the Sm 2 O 3 surface modification acts as a robust multifunctional protective layer, effectively shielding against hydrofluoric acid-induced chemical attack and enhancing the migration efficiency of lithium ions . Notably, the capacity retention rate of LNMO@Sm 2 O 3 (3 wt%) remains up to 88 % after 280 cycles, significantly surpassing the uncoated counterpart. The coated material exhibits a capacity of 114 mAh g −1 even under 10 C rate conditions. Moreover, the AC impedance values and manganese dissolution of the modified material in the organic electrolyte are considerably lower than those of the uncoated counterpart. Theoretical calculations strongly support the experimental findings, revealing higher Mn vacancy formation energy and density of states at the Fermi energy level for the Sm 2 O 3 -modified electrodes. This research contributes to the field of surface modification and paves the way for further enhancements in the electrochemical performance of other high-voltage manganese-based lithium-ion batteries (LIBs).

研究领域: 材料科学 · 电化学 · 能源存储 · 无机化学 · 纳米技术 · 表面工程 · 锂电池

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NaClO4 as an effective electrolyte additive for high-energy Li-ion batteries

Enhanced electrochemical performance of a cost-effective Sm2O3-coated spinel LiNi0.5Mn1.5O4 cathode for high-voltage lithium-ion batteries