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Iron Phosphate/Bacteria Composites as Precursors for Textured Electrode Materials with Enhanced Electrochemical Properties.
- Source :
- Journal of The Electrochemical Society; 2016, Vol. 163 Issue 10, pA2139-A2148, 10p
- Publication Year :
- 2016
-
Abstract
- 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-FePO<subscript>4</subscript> . xH<subscript>2</subscript>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-FePO<subscript>4</subscript> . xH<subscript>2</subscript>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<superscript>III</superscript> / Fe<superscript>II</superscript>) at a mean voltage of 3.0 Volts (vs. Li<superscript>+</superscript>/Li<superscript>°</superscript>) with performances (first cycle reversibility, reversible capacity, power efficiency, cycle life) that equal or even overpass those of abiotic a-FePO<subscript>4</subscript> . xH<subscript>2</subscript>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. [ABSTRACT FROM AUTHOR]
- Subjects :
- LITHIUM ions
ELECTRODES
CHEMICAL synthesis
IRON compounds
ELECTROCHEMICAL research
Subjects
Details
- Language :
- English
- ISSN :
- 00134651
- Volume :
- 163
- Issue :
- 10
- Database :
- Supplemental Index
- Journal :
- Journal of The Electrochemical Society
- Publication Type :
- Academic Journal
- Accession number :
- 119112921
- Full Text :
- https://doi.org/10.1149/2.0101610jes