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Title: Increasing the high rate performance of mixed metal phospho-olivine cathodes through collective and cooperative strategies
Authors: Ding, B.
Ji, G.
Ma, Y.
Xiao, P.
Lu, L. 
Lee, J.Y. 
Keywords: Bi-continuous
High rate
Issue Date: 2014
Citation: Ding, B., Ji, G., Ma, Y., Xiao, P., Lu, L., Lee, J.Y. (2014). Increasing the high rate performance of mixed metal phospho-olivine cathodes through collective and cooperative strategies. Journal of Power Sources 247 : 273-279. ScholarBank@NUS Repository.
Abstract: The performance of lithium manganese phosphate as a lithium-ion battery cathode material is improved by collective and cooperative strategies including Fe substitution, carbon coating, and the assembly of carbon-coated LiMn 1-xFexPO4 nanocrystals into a highly dense packing of monodisperse microboxes. These strategies are implemented experimentally by a facile and scalable synthesis method. The dense packing allows the conductive carbon coating to be interconnected into a continuous three-dimensional network for electron conduction. The porosity in the packed structure forms the complementary network for Li+ transport in the electrolyte. The primary particles are nanosized and Fe-substituted to improve the effectiveness of Li+ insertion and extraction reactions in the solid phase. The reduction of transport resistance external and internal to the nanocrystals yields a Li storage host with good rate performance (116 mAh g -1 at 5 C discharge rate where C = 170 mA g-1) and cycle stability (95% retention of initial capacity in 50 cycles). Electrochemical impedance spectroscopy and morphology examination of the cycled microboxes reveal a robust packed structure with stable surfaces. © 2013 Elsevier B.V. All rights reserved.
Source Title: Journal of Power Sources
ISSN: 03787753
DOI: 10.1016/j.jpowsour.2013.08.114
Appears in Collections:Staff Publications

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