Fast and Reversible Li Ion Insertion in Carbon‐Encapsulated Li3VO4 as Anode for Lithium‐Ion Battery. (4th May 2015)

• Record Type: Journal Article
• Authors: Zhang, Changkun; Song, Huanqiao; Liu, Chaofeng; Liu, Yaguang; Zhang, Cuiping; Nan, Xihui; Cao, Guozhong
• Is Part Of: Advanced functional materials. Volume 25:Number 23(2015)
• Page Start: 3497
• Page End: 3504
• Publication Date: 2015-05-04
• Subjects: Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201500644
• Languages: English
• ISSNs: 1616-301X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Carbon‐encapsulated Li<sub>3</sub>VO<sub>4</sub> is synthesized by a facile environmentally benign solid‐state method with organic metallic precursor VO(C<sub>5</sub>H<sub>7</sub>O<sub>2</sub>)<sub>2</sub> being chosen as both V and carbon sources yielding a core–shell nanostructure with lithium introduced in the subsequent annealing process. The Li<sub>3</sub>VO<sub>4</sub> encapsulated with carbon presents exceeding rate capability (a reversible capability of 450, 340, 169, and 106 mAh g<sup>−1</sup> at 0.1 C, 10 C, 50 C, and 80 C, respectively) and long cyclic performance (80% capacity retention after 2000 cycles at 10 C) as an anode in lithium‐ion batteries. The superior performance is derived from the structural features of the carbon‐encapsulated Li<sub>3</sub>VO<sub>4</sub> composite with oxygen vacancies in Li<sub>3</sub>VO<sub>4</sub>, which increase surface energy and could possibly serve as a nucleation center, thus facilitating phase transitions. The in situ generated carbon shell not only facilitates electron transport, but also suppresses Li<sub>3</sub>VO<sub>4</sub> particle growth during the calcination process. The encouraging results demonstrate the significant potential of carbon encapsulated Li<sub>3</sub>VO<sub>4</sub> for high power batteries. In addition, the simple generic synthesis method is applicable to the fabrication of a variety of electrode materials for batteries and supercapacitors with unique core–shell structure with mesoporous carbon shell.</p> </abstract>