A practical and effective strategy for the thin and uniform carbon layer onto LiCoPO4 cathode surface in terms of the rate capability and cycle stability. (November 2016)

• Record Type: Journal Article
• Authors: Örnek, Ahmet; Yeşildağ, Ali; Can, Mustafa; Aktürk, Selçuk
• Is Part Of: Materials research bulletin. Volume 83(2016)
• Page Start: 1
• Page End: 11
• Publication Date: 2016-11
• Subjects: Electronic materials -- Solvothermal -- Transmission electron microscopy (TEM) -- Electrochemical properties -- Energy storage -- LiCoPO4 cathode; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2016.04.019
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Structural, morphological and electrochemical properties of LiCoPO4 /C electrodes are investigated. Cheap and simple microwave & solvothermal approach is used. After 80th cycle, capacity retention is almost 91% for LiCoPO4 /C electrode. Tannic acid was used as carbon source and its unique effects were revealed. Abstract: Nanoscale pure LiCoPO4 and LiCoPO4 /C materials were successfully synthesized as excellent quality cathode materials for high-voltage and high energy density lithium-ion applications. These materials are simply produced by combined magnetron power and the solvothermal method followed by heat treatment. Analyses show that distribution of a surface coated with carbon, 5–7 nm thickness by tannic acid and nanostructured LiCoPO4 /C cathode exhibits a higher and stable reversible capacity (155.2 mAh g −1 ) with the long voltage plateau nearly 4.8 V. Furthermore, this cathode exhibits capacity retention as 91% after 80 cycles and this value makes it one of the highest of those reported to date. The LiCoPO4 /C electrode is produced simultaneously under high pressure and using microwave energy and this has an influence on excellent cycling behavior. The obtained results prove that a production dynamics in nano-synthesis and coating process with proper carbon source reveal parameters to synthesis favorable cathode materials.