Journal
JOURNAL OF POWER SOURCES
Volume 477, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228701
Keywords
Nickel-rich layered oxide; Cationic disordering; Microcrack; Structural decay; Cathode material
Funding
- National Natural Science Foundation of China [51874358, 51772333]
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Ni-rich layered oxides LiNixTM1-xO2 (TM = Co, Mn, Al, x > 0.6) cathode materials for lithium-ion batteries have an anisotmpic volume change during lithium deintercalation process, which easily causes microcracks and rapid capacity decay. In the paper, carbonate precursor prepared by a urea-based hydrothermal method is lithiated at different temperatures of 750-850 degrees C to obtain agglomerate LiNi0.8Co0.1Mn0.1O2 (NCM811) cathode material with different primary sizes. The sample synthesized at 750 degrees C shows broadening diffraction peaks due to its near-nano grain size, which results in the merging of (006)/(012) and (018)/(110) peaks. The effect of anisotropic volume shrinkage is effectively weakened by fine grain range, which alleviates formation of intergranular crack that is commonly considered as an important reason for capacity decay of Ni-rich layered oxide cathode materials. In addition, two new types of intragranular micmcracks are first identified in cyclic NCM811. One extends along the spinel phase and layered phase interface, and the other extends along the vertical (003) (R) crystal plane. The difference in atomic plane spacing during the electrochemical cycles plays a key role in the growth of intragranular microcracks.
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