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Study on Solvthermal Synthesis and Li-storage Preperties of Antimony-based Materials

Author: BaiLianHua
Tutor: ZhouXiaoZhong
School: Northwest Normal University
Course: Polymer Chemistry and Physics
Keywords: lithium-ion batteries anode material solvothermal treatment Antimony-basedmaterials electrochemical properties
CLC: TM912
Type: Master's thesis
Year: 2013
Downloads: 6
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Abstract


The graphite anode has a relatively low theoretical specific capacity （372mAh/g）,thereby restricting its future applications. So, it is very important to develop alternativeanode materials with higer specific capacity and bettery cycling durability for the newgeneration Li-ion batteries. Sb has a theoretical capacity of660mAh/g, which is almosttwice that of graphite. However, the big problem accompanying with the above alloyingreaction is the drastic volume expansion after lithiation, thus usually resulting in a poorcycle performance. It is commonly agreed now that using a nano-structured electrode or amulti-phase material can greatly relieve the volume expansion associated with the alloyingreaction. In this paper, antimony-based composite materials （Sb2S3, Sb2S3@C andSb4O5Cl2/rGO/C composites） were prepared by a simple solvothermal treatmen, theirmorphology, microstructure and electrochemical performances of intercalation wereinvestigated.（1） Sb2S3@C composite nanorods were synthesized successfully by a facile ethanolsolvothermal treatment, when L-cys.HCl and SbCl3mole ratio is3:1,180oC keep8h. Theas-synthesized Sb2S3@C composite was found to display the highest lithiation anddelithiation during the first cycle,823/1165mAh/g, with the initial Coulombic efficiency of70.6%, reversible specific capacity is623mAh/g after30cycles at a current density of100mA/g,75.7%capacity retention, and reversible specific capacity stay above400mAh/g ata current density of500mA/g. In addition, carbon-coated materials can improve Sb2S3electrochemical lithium storage properties of electrode materials, coated carbon designcontent for5wt.%of the Sb2S3@C composite material has the best electrochemicalproperties at a current density of100mA/g, display the highest reversible specificcapacity（1084mAh/g）, excellent long performance （after30cycles capacity is960mAh/g,88.5%capacity retention） and the excellent rate of properties （capacity is1019mAh/g at acurrent density of500mA/g）. Sb2S3-based electrode material of ultra-high capacity isascribed to part of Sb2S3reversible decomposition and reconstruction duringelectrochemical lithium storage, this also confirmed the nanorods structure promoted theSb2S3decomposition/reconstruction on electrochemical reversibility during the chargingand discharging process, thus improve the initial coulombic efficiency and electrode specific capacity; Carbon-coated materials can not only improve the electrical conductivityof Sb2S3particles and relieve effectively volume change during the charging anddischarging process and disulfide dissolved in the electrolyte, but also promotereconstruction of Sb2S3and Li2S to S degree of reversible electrochemical reaction, thusimprove the reversible specific capacity composite material, performance and cycleperformance.（2） A Sb4O5Cl2/rGO/C composites was prepared by a simple solvothermal treatmentand tested as an anode material for lithium-ion batteries for the first time in this study. Thepreparatory experimental results showed that the as-prepared Sb4O5Cl2/RGO/C compositecould deliver a reversible capacity of636mAh/g for the first cycle, and moreover a highreversible capacity of334mAh/g could remain even after60cycles.

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