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Hydrothermal Synthesis of Unique Hollow Hexagonal Prismatic Pencils of Co 3 V 2 O 8 ⋅ n H 2 O: A New Anode Material for Lithium‐Ion Batteries
Author(s) -
Wu Fangfang,
Xiong Shenglin,
Qian Yitai,
Yu ShuHong
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201503487
Subject(s) - hydrothermal circulation , materials science , lithium (medication) , hydrothermal synthesis , anode , hexagonal crystal system , metal , oxide , transition metal , hexagonal phase , chemical engineering , nanotechnology , crystallography , chemistry , electrode , organic chemistry , metallurgy , catalysis , medicine , engineering , endocrinology
Hollow structures of transition‐metal oxides, particularly mixed‐metal oxides, could be promising for various applications such as lithium‐ion batteries (LIBs). Compared to the synthesis of metal oxide hollow spheres by the template method, non‐spherical metal oxide hollow hexagonal polyhedra have not been developed to date. Herein, we report the controlled hydrothermal synthesis of a new phase of Co 3 V 2 O 8 ⋅ n H 2 O hollow hexagonal prismatic pencils (HHPPs), which is composed of uniform structural units. By varying the amount of NaOH in the presence of NH 4 + and without any template or organic surfactant, the hexagonal prismatic pencils gradually transform from solid into hollow structures, with sizes varying from 5 to 20 μm. The structure of pencils can be preserved only in a limited range of the molar ratio of OH − /NH 4 + . As a new anode material for LIBs, such hollow pencils exhibit impressive lithium storage properties with high capacity, good cycling stability, and superior rate capability.