Chromium doping as a new approach to improve the cycling performance at high temperature of 5 V LiNi0.5Mn1.5O4-based positive electrode
Identifieur interne : 000596 ( Main/Exploration ); précédent : 000595; suivant : 000597Chromium doping as a new approach to improve the cycling performance at high temperature of 5 V LiNi0.5Mn1.5O4-based positive electrode
Auteurs : Mohamed Aklalouch [Espagne, Maroc] ; José Manuel Amarilla [Espagne] ; Rosa M. Rojas [Espagne] ; Ismael Saadoune [Maroc] ; José Maria Rojo [Espagne]Source :
- Journal of power sources [ 0378-7753 ] ; 2008.
Descripteurs français
- Pascal (Inist)
- Chrome, Dopage, Cycle charge décharge, Haute performance, Lithium Nickel Manganèse Oxyde, Spinelle, Combustion, Diffractométrie RX, Thermogravimétrie, Paramètre cristallin, Dimension particule, Microscopie électronique balayage, Microscopie électronique transmission, Effet température, Propriété thermique, Traitement thermique, Propriété électrochimique, Lithium, Performance, Batterie lithium, Accumulateur électrochimique.
- Wicri :
English descriptors
- KwdEn :
- Chromium, Combustion, Discharge charge cycle, Doping, Electrochemical properties, Heat treatment, High performance, Lattice parameters, Lithium, Lithium Nickel Manganese Oxides, Lithium battery, Particle size, Performance, Scanning electron microscopy, Secondary cell, Spinel, Temperature effect, Thermal properties, Thermogravimetry, Transmission electron microscopy, X ray diffractometry.
Abstract
LiCr2YNi0.5-YMn1.5-YO4 (0 < Y≤ 0.2) spinels have been synthesized by a sucrose-aided combustion method. Two sets of Cr-doped samples have been obtained by heating the "as-prepared" samples at 700 and 900 °C for 1 h. X-ray diffraction and thermogravimetric data show that pure and single phase spinels with similar lattice parameter have been synthesized. The homogeneity and the sub-micrometric particle size of the spinels have been shown by SEM and TEM. The main effect of the temperature is to increase the particle size from ≃ 50 to ≃ 500 nm, on heating from 700 to 900°C. The study of the influence of Cr-dopant content and thermal treatment on the electrochemical properties at 25 C and at 55°C has been carried out by galvanostatic cycling in Li-cells. The discharge capacity (≃130 mAh g-1) does not noticeably change with the synthesis conditions; but the cycling performances are strongly modified. Key factors that control the cycling performances have been determined. The most highlighted result is that spinels heated at 900 °C with Y≤ 0.1 have very high capacity retention at 55 °C (>96% after 40 cycles, cyclability >99.9% by cycle) indicating that metal doping is a new approach to prepare 5V LiNi0.5Mn1.5O5-based cathodes with excellent cycling performances at high temperature.
Affiliations:
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A. El Khattabi, B.P.549 Marrakech</s1><s3>MAR</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>ECME, Faculté des Sciences et Techniques Marrakech, Université Cadi Ayyad, Av. A. El Khattabi, B.P.549 Marrakech</wicri:noRegion></affiliation></author><author><name sortKey="Amarilla, Jose Manuel" sort="Amarilla, Jose Manuel" uniqKey="Amarilla J" first="José Manuel" last="Amarilla">José Manuel Amarilla</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigociones Científicas (CSIC) c/SorJuana Inés de la Cruz</s1><s2>28049 Madrid</s2><s3>ESP</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Communauté de Madrid</region></placeName></affiliation></author><author><name sortKey="Rojas, Rosa M" sort="Rojas, Rosa M" uniqKey="Rojas R" first="Rosa M." last="Rojas">Rosa M. Rojas</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigociones Científicas (CSIC) c/SorJuana Inés de la Cruz</s1><s2>28049 Madrid</s2><s3>ESP</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Communauté de Madrid</region></placeName></affiliation></author><author><name sortKey="Saadoune, Ismael" sort="Saadoune, Ismael" uniqKey="Saadoune I" first="Ismael" last="Saadoune">Ismael Saadoune</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>ECME, Faculté des Sciences et Techniques Marrakech, Université Cadi Ayyad, Av. A. El Khattabi, B.P.549 Marrakech</s1><s3>MAR</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>ECME, Faculté des Sciences et Techniques Marrakech, Université Cadi Ayyad, Av. A. El Khattabi, B.P.549 Marrakech</wicri:noRegion></affiliation></author><author><name sortKey="Rojo, Jose Maria" sort="Rojo, Jose Maria" uniqKey="Rojo J" first="José Maria" last="Rojo">José Maria Rojo</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigociones Científicas (CSIC) c/SorJuana Inés de la Cruz</s1><s2>28049 Madrid</s2><s3>ESP</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Communauté de Madrid</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of power sources</title><title level="j" type="abbreviated">J. power sources</title><idno type="ISSN">0378-7753</idno><imprint><date when="2008">2008</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of power sources</title><title level="j" type="abbreviated">J. power sources</title><idno type="ISSN">0378-7753</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Chromium</term><term>Combustion</term><term>Discharge charge cycle</term><term>Doping</term><term>Electrochemical properties</term><term>Heat treatment</term><term>High performance</term><term>Lattice parameters</term><term>Lithium</term><term>Lithium Nickel Manganese Oxides</term><term>Lithium battery</term><term>Particle size</term><term>Performance</term><term>Scanning electron microscopy</term><term>Secondary cell</term><term>Spinel</term><term>Temperature effect</term><term>Thermal properties</term><term>Thermogravimetry</term><term>Transmission electron microscopy</term><term>X ray diffractometry</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Chrome</term><term>Dopage</term><term>Cycle charge décharge</term><term>Haute performance</term><term>Lithium Nickel Manganèse Oxyde</term><term>Spinelle</term><term>Combustion</term><term>Diffractométrie RX</term><term>Thermogravimétrie</term><term>Paramètre cristallin</term><term>Dimension particule</term><term>Microscopie électronique balayage</term><term>Microscopie électronique transmission</term><term>Effet température</term><term>Propriété thermique</term><term>Traitement thermique</term><term>Propriété électrochimique</term><term>Lithium</term><term>Performance</term><term>Batterie lithium</term><term>Accumulateur électrochimique</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Chrome</term><term>Dopage</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">LiCr<sub>2Y</sub>Ni<sub>0.5-Y</sub>Mn<sub>1.5-Y</sub>O<sub>4</sub> (0 < Y≤ 0.2) spinels have been synthesized by a sucrose-aided combustion method. Two sets of Cr-doped samples have been obtained by heating the "as-prepared" samples at 700 and 900 °C for 1 h. X-ray diffraction and thermogravimetric data show that pure and single phase spinels with similar lattice parameter have been synthesized. The homogeneity and the sub-micrometric particle size of the spinels have been shown by SEM and TEM. The main effect of the temperature is to increase the particle size from ≃ 50 to ≃ 500 nm, on heating from 700 to 900°C. The study of the influence of Cr-dopant content and thermal treatment on the electrochemical properties at 25 C and at 55°C has been carried out by galvanostatic cycling in Li-cells. The discharge capacity (≃130 mAh g<sup>-1</sup>) does not noticeably change with the synthesis conditions; but the cycling performances are strongly modified. Key factors that control the cycling performances have been determined. The most highlighted result is that spinels heated at 900 °C with Y≤ 0.1 have very high capacity retention at 55 °C (>96% after 40 cycles, cyclability >99.9% by cycle) indicating that metal doping is a new approach to prepare 5V LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>5</sub>-based cathodes with excellent cycling performances at high temperature.</div></front></TEI><affiliations><list><country><li>Espagne</li><li>Maroc</li></country><region><li>Communauté de Madrid</li></region></list><tree><country name="Espagne"><region name="Communauté de Madrid"><name sortKey="Aklalouch, Mohamed" sort="Aklalouch, Mohamed" uniqKey="Aklalouch M" first="Mohamed" last="Aklalouch">Mohamed Aklalouch</name></region><name sortKey="Amarilla, Jose Manuel" sort="Amarilla, Jose Manuel" uniqKey="Amarilla J" first="José Manuel" last="Amarilla">José Manuel Amarilla</name><name sortKey="Rojas, Rosa M" sort="Rojas, Rosa M" uniqKey="Rojas R" first="Rosa M." last="Rojas">Rosa M. Rojas</name><name sortKey="Rojo, Jose Maria" sort="Rojo, Jose Maria" uniqKey="Rojo J" first="José Maria" last="Rojo">José Maria Rojo</name></country><country name="Maroc"><noRegion><name sortKey="Aklalouch, Mohamed" sort="Aklalouch, Mohamed" uniqKey="Aklalouch M" first="Mohamed" last="Aklalouch">Mohamed Aklalouch</name></noRegion><name sortKey="Saadoune, Ismael" sort="Saadoune, Ismael" uniqKey="Saadoune I" first="Ismael" last="Saadoune">Ismael Saadoune</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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