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Title: Polymer microsphere-assisted synthesis of lithium-rich cathode with improved electrochemical performance
Authors: Ma, S
Hou, X
Huang, Y
Li, C
Hu, S
Lam, KH 
Keywords: Co-precipitation
Li-rich cathode
Polymer microsphere-assisted
Porous structure
Issue Date: 2016
Publisher: Pergamon Press
Source: Ceramics international, 2016, v. 42, no. 4, p. 4899-4910 How to cite?
Journal: Ceramics international 
Abstract: The Li-rich layered cathode material Li1.165Mn0.501Ni0.167Co0.167O2 with porous structure has been successfully synthesized through a facile co-precipitation approach followed with a high-temperature calcination treatment, adopting polymer microsphere (PSA) as a template and conductive agent. The PSA-assisted Li1.165Mn0.501Ni0.167Co0.167O2 composite exhibits remarkably improved cycling stability and rate capability compared with the bare composite. It delivers a high initial discharge capacity of 267.0 mA h g-1 at 0.1 C (1 C=250 mA g-1) between 2.0 V and 4.65 V. A discharge capacity of 214.9 mA h g -1 is still obtained after 100 cycles. Furthermore, the diffusion coefficients of Li+ investigated by the cyclic voltammetry technique are approximately 10-15-10-14 cm2 s-1. Such outstanding performance is mainly ascribed to: on one hand, the carbon residue of PSA after being calcined at high temperature contributes to enhance the electronic conductivity of the electrode and alleviates the volume changes during the Li+-insertion/extraction, leading to an improved rate capability; on the other hand, the unique porous structure and small particle size are conductive to increase the exposed electrochemical active surface, shorten Li+ diffusion distance and thus enhance the lithium storage capacity.
ISSN: 0272-8842
EISSN: 1873-3956
DOI: 10.1016/j.ceramint.2015.11.173
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