期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 163, 期 10, 页码 A2139-A2148出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0101610jes
关键词
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资金
- French Reseau sur le Stockage Electrochimique de l'Energie (RS2E)
- ANR SRB project of the French Agence Nationale de la Recherche [ANR-14-CE33-0003-01]
- NSERC
- CIHR
- NRC
- University of Saskatchewan
An important issue linked to the wide implementation of the Li-ion technology for large scale application deals with the development of eco-efficient synthesis processes for making electrode materials. We report herein the preparation of homogeneous, dense and nanometric layers of amorphous ferric phosphates (a-FePO4 center dot xH(2)O) using a bacteria (Sporosarcina pasteurii) as nucleating template. By combining various analytical tools (including thermal analyses, Raman and XANES spectroscopies) we show that the the bacterial cell wall plays a key role in the nucleation process thereby controlling particle size and precipitation kinetics. Moreover, we demonstrate that a mild thermal treatment of the bacteria/(a-FePO4 center dot xH(2)O) core shell structure leads to the decomposition of the insulating bacteria into a carbon-based residue, which is beneficial to the electrode conductivity. This as-prepared material electrochemically reacts with lithium (Fe-III/Fe-II) at a mean voltage of 3.0 Volts (vs. Li+/Li degrees) with performances (first cycle reversibility, reversible capacity, power efficiency, cycle life) that equal or even overpass those of abiotic a-FePO4 center dot xH(2)O materials mixed with conductive carbon through harsh or complex procedures. Overall, this bio-templating route represents a soft/cheap alternative to tackle conductivity issues in battery electrode processing. (C) 2016 The Electrochemical Society. All rights reserved.
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