Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10624360 | Ceramics International | 2016 | 12 Pages |
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 gâ1 at 0.1 C (1 C=250 mA gâ1) between 2.0 V and 4.65 V. A discharge capacity of 214.9 mA h g â1 is still obtained after 100 cycles. Furthermore, the diffusion coefficients of Li+ investigated by the cyclic voltammetry technique are approximately 10â15-10â14 cm2 sâ1. 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Shaomeng Ma, Xianhua Hou, Yanling Huang, Changming Li, Shejun Hu, Kwok-ho Lam,