A Peapod‐like CoP@C Nanostructure from Phosphorization in a Low‐Temperature Molten Salt for High‐Performance Lithium‐Ion Batteries. Issue 32 (13th July 2018)

• Record Type: Journal Article
• Authors: Liu, Zhiliang; Yang, Sungjin; Sun, Bingxue; Chang, Xinghua; Zheng, Jie; Li, Xingguo
• Is Part Of: Angewandte Chemie international edition. Volume 57:Issue 32(2018)
• Page Start: 10187
• Page End: 10191
• Publication Date: 2018-07-13
• Subjects: cobalt -- lithium-ion batteries -- low-temperature molten salts -- magnesium -- transition-metal phosphides; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201805468
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: A mild phosphorization process in low‐temperature molten salt (NaCl‐KCl‐AlCl3 ) has been developed to synthesize peapod‐like CoP@C nanostructures by using low‐toxicity industrial PCl3 as the phosphorus source and Mg as the reductant at 250 °C. Importantly, high efficiency of the phosphorous source is achieved since only stoichiometric PCl3 is required to complete the reaction. The molten NaCl‐KCl‐AlCl3 not only provides a liquid environment but also participates in the electron transport by the reversible conversion of the Al 3+ /Al redox couple. The obtained 0D‐in‐1D peapod CoP@C structure exhibits excellent lithium storage performance, delivering a superiorly stable capacity of 500 mAh g −1 after 800 cycles at a high current of 1.0 A g −1 . Abstract : Mild phosphorization with a low‐toxicity phosphorus source and magnesium in a low‐temperature molten salt is used in the high‐efficiency synthesis of peapod‐like CoP@C with superior lithium storage performance. This represents a significant breakthrough for the development of phosphide based functional materials.