The particle morphology determined by the sintering process is the director factor affecting the electro-chemical performance of Ni-rich NMC cathode materials.To prepare the ideal NMC particles,it is of great significance to understand the morphological changes during sintering process.In this work,the mor-phology evolution of LiNi0.8Mn0.1Co0.1O2(NMC811)synthesis at temperature ranging from 300-1080℃were observed by in situ SEM.The uniform mixture of spherical Ni0.8Mn0.1Co0.1(OH)2 precursor and lithium sources(LiOH)was employed by high temperature solid-state process inside the SEM,which enables us to observe morphology changes in real time.The results show that synthetic reaction of LiNi0.8Mn0.1Co0.1O2 usually includes three processes:the raw materials'dehydration,oxidation,and com-bination,accompanied by a significant reduction in particle size,which is important reference to control the synthesis temperature.As heating temperature rise,the morphology of mixture also changed from flake to brick-shaped.However,Ni nanoparticle formation is apparent at higher temperature～1000℃,suggesting a structural transformation from a layered to a rock-salt-like structure.Combining the in-situ observed changes in size and morphology,and with the premise of ensuring the morphology change from flakes to bricks,reducing the sintering temperature as much as possible to prevent excessive reduc-tion in particle size and layered to a rock-salt structure transformation is recommended for prepare ideal NMC particles.

Liang Tang;Xiaopeng Cheng;Rui Wu;Tianci Cao;Junxia Lu;Yuefei Zhang;Ze Zhang

Institute of Microstructure and Property of Advanced Materials,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;Institute of Laser Engineering,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;School of Materials Science and Engineering,Zhejiang University,Hangzhou 310058,Zhejiang,China

能源化学

[1]Liang Tang;Xiaopeng Cheng;Rui Wu;Tianci Cao;Junxia Lu;Yuefei Zhang;Ze Zhang-.Monitoring the morphology evolution of LiNi0.8Mn0.1Co0.1O2 during high-temperature solid state synthesis via in situ SEM)[J].能源化学,2022(03):9-15

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