Title

Shape-controlled synthesis of hierarchically layered lithium transition-metal oxide cathode materials by shear exfoliation in continuous stirred-tank reactors

RIS ID

118252

Publication Details

Hua, W., Wu, Z., Chen, M., Knapp, M., Guo, X., Indris, S., Binder, J. R., Bramnik, N. M., Zhong, B., Guo, H., Chou, S., Kang, Y. & Ehrenberg, H. (2017). Shape-controlled synthesis of hierarchically layered lithium transition-metal oxide cathode materials by shear exfoliation in continuous stirred-tank reactors. Journal of Materials Chemistry A, 5 (48), 25391-25400.

Abstract

Developing hierarchically layered cathode materials with high performance is key to further improving advanced lithium-ion batteries, but it is challenging to synthesize such systems with controllable shape on a large scale. We used a high-shear mixer to continuously prepare flower-like hydroxide precursors via a co-precipitation method in a continuous stirred-tank reactor (CSTR). After the lithiation reaction, hierarchical lithium transition-metal oxides with predominantly exposed electrochemically active {010} planes are produced. The electrochemical properties of these peculiar materials (i.e. LiNi 1/3 Co 1/3 Mn 1/3 O 2 , LiNi 0.6 Co 0.2 Mn 0.2 O 2 and Li 1.2 Ni 0.2 Mn 0.6 O 2 ) are demonstrated to be excellent. Particularly, LiNi 1/3 Co 1/3 Mn 1/3 O 2 exhibits a durable high-rate capability with a capacity retention of 98.2% after 500 cycles at 20C between 2.7 and 4.3 V. This work provides a new technology to fabricate two-dimensional nanoarchitectured electrode materials. Moreover, the outstanding electrochemical properties of this hierarchically structured cathode material in combination with the scalable method make it highly interesting for commercialization.

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Link to publisher version (DOI)

http://dx.doi.org/10.1039/c7ta08073e