The 2D Rancieite-type manganic acid and its Li-exchanged derivative: A new synthetic route for a better cycling behavior
作者:
Franck Gascoin,
Sylvere Sarciaux,
Dominique Guyomard,
Yves Piffard,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 311,
issue 1
页码: 57-62
ISSN:1058-725X
年代: 1998
DOI:10.1080/10587259808042366
出版商: Taylor & Francis Group
关键词: phyllomanganate;surface area;Li intercalation;cycling behavior
数据来源: Taylor
摘要:
The usual preparation route of lithiated Rancieite-type Manganese Oxide (Li-RMO) includes three steps: reduction of KMnO4in acidic medium (1), followed by a further acidic treatment which ensures a complete K+/H+exchange (2) and subsequent Li+/H+ion-exchange reaction (3). The surface area of the as prepared Li-RMO is always several tens of m2g−1. Its initial capacity with respect to electrochemical Li intercalation is 220 mAh/g with an average voltage of 2.85V (vs Li). However, a rapid capacity fading is observed upon cycling, due to a dissolution of the material likely related to its large surface area. A new synthetic route is proposed leading to a material with a surface area less than 10 m2g−1. As expected, the cycling behavior of this new material is greatly improved.
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