In Situ Formation of Conductive Metal Sulfide Domain in Metal Oxide Matrix: An Efficient Way to Improve the Electrochemical Activity of Semiconducting Metal Oxide. (6th July 2015)

• Record Type: Journal Article
• Authors: Kim, In Young; Seo, Jiyoon; Oh, Seung Mi; Patil, Sharad B.; Hwang, Seong‐Ju
• Is Part Of: Advanced functional materials. Volume 25:Number 31(2015)
• Page Start: 4948
• Page End: 4955
• Publication Date: 2015-07-06
• Subjects: batteries -- composite materials -- electrodes -- in situ formation -- metal sulfide; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201501478
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract : A new effective way to improve the electrochemical activity of semiconducting metal oxide is developed by the in situ formation of conductive metal sulfide domain in the metal oxide matrix. The Li0.96 Ti1.08 S2 −Li4 Ti5 O12 nanocomposites with tunable compositions and electrical properties are synthesized by the reaction of Li4 Ti5 O12 with CS2 at elevated temperature. The resulting incorporation of conductive Li0.96 Ti1.08 S2 domain in the Li4 Ti5 O12 matrix is effective in enhancing the electrical conductivity and electrode activity of semiconducting lithium titanate. As anode materials for lithium ion batteries, the obtained Li0.96 Ti1.08 S2 −Li4 Ti5 O12 nanocomposites show much greater discharge capacity and better rate characteristics than does the pristine Li4 Ti5 O12 . The usefulness of the present method is further evidenced from the improvement of the electrochemical activity of semiconducting CsTi2 NbO7 after the reaction with CS2 . The present study clearly demonstrates the in situ formation of conductive metal sulfide domain using CS2 liquid can provide an efficient and universal way to improve the electrode functionality of semiconducting metal oxide. Abstract : An effective synthetic route to novel metal sulfide−metal oxide nanocomposites is developed on the basis of the in situ formation of conductive metal sulfide domains in a metal oxide matrix. The resulting Li0.96 Ti1.08 S2 −Li4 Ti5 O12 nanocomposites show promising functionality as anode materials for lithium secondary batteries with excellent rate characteristics, underscoring the usefulness of the present in situ composite formation route.