期刊
JOURNAL OF ENERGY STORAGE
卷 67, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.est.2023.107541
关键词
Li supply amount; Sintering temperature; LiNi0; 9Co0; 05Mn0; Electrochemical properties
Ni-rich LiNi0.9Co0.05Mn0.05O2 cathode materials with improved electrochemical performance are successfully synthesized by two-step heating treatment method and controlling the Li supply amount and sintering temperature. This study provides a rational regulating strategy for synthesizing Ni-rich cathode materials and further expands their applications in the fields of smart grids and electric vehicles.
Layered Ni-rich cathode materials (LiNixCoyMn1-x-yO2) are promising cathode materials for next-generation lithium-ion batteries due to their high reversible capacity and energy density. However, it is still facing the challenges in unstable structure and weak electrochemical properties, inhibiting their large-scale application. Herein, Ni-rich LiNi0.9Co0.05Mn0.05O2 cathode materials are synthesized using Ni0.9Co0.05Mn0.05(OH)2 precursors and Li source by two-steps heating treatment processes. Their structure and properties are regulated by con -trolling Li supply amounts and sintering temperature to further expand the applications of Ni-rich cathode materials. Experimental results suggest that the preheating at 500 degrees C effectively establishes a structural foun-dation (R-3m) for the following sintering of LiNi0.9Co0.05Mn0.05O2 materials. Furthermore, it is found that Li supply amount and sintering temperature have a certain correlation with the structural stability and electro-chemical properties of materials. At Li supply amount 1.04 (Li/transition metals atom ratio) and sintering temperature 700 degrees C, the prepared LiNi0.9Co0.05Mn0.05O2 materials exhibit optimal electrochemical properties (77.0 % capacity retention after 400 cycles at 1C, and about 128.0 mAh g-1 discharge capacity at 10C). This study provides a rational regulating strategy for synthesizing Ni-rich LiNi0.9Co0.05Mn0.05O2 cathode materials with controllable structural and electrochemical properties, further expanding their applications in the fields of smart grids and electric vehicles.
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