Polymer microsphere-assisted synthesis of lithium-rich cathode with improved electrochemical performance. Issue 4 (March 2016)

• Record Type: Journal Article
• Authors: Ma, Shaomeng; Hou, Xianhua; Huang, Yanling; Li, Changming; Hu, Shejun; Lam, Kwok-ho
• Is Part Of: Ceramics international. Volume 42:Issue 4(2016)
• Page Start: 4899
• Page End: 4910
• Publication Date: 2016-03
• Subjects: Li-rich cathode -- Co-precipitation -- Polymer microsphere-assisted -- Porous structure; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.11.173
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The Li-rich layered cathode material Li1.165 Mn0.501 Ni0.167 Co0.167 O2 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 Li1.165 Mn0.501 Ni0.167 Co0.167 O2 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 cm 2 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.