长循环寿命非水系锂-氧电池的可逆性研究
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- 英文论文题名：Reversibility of Aprotic Li-O_2 Cells with Excellent Cyclability
- 论文作者：马顺超 ; 吴扬 ; 彭章泉
- 英文论文作者：Shunchao Ma ; Yang Wu ; Zhangquan Peng ; State Key Laboratory of Electroanalytical Chemistry ; Changchun Institute of Applied Chemistry ; Chinese Academy of Sciences ; University of Chinese Academy of Sciences ; Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center ; Tsinghua University
- 年：2016
- 作者机构：电化学分析国家重点实验室中国科学院长春应用化学研究所;中国科学院大学;清华大学物理系富士康纳米科技研究中心;
- 论文关键词：锂-氧气电池 ; 贵金属催化剂 ; 微分电化学质谱 ; 氧气消耗/生成速率 ; 可逆性
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十分会：化学电源
- 语种：中文
- 分类号：TM911.41;O643.36
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十分会 ; 化学电源
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：2
- 文件大小：265k
- 原文格式：D
- 会议级别：全国
摘要
可充电的锂-氧气电池,由于其远高于商业化的锂离子电池的能量密度,成为储能领域的研究热点。~([1-3])然而,此新型电池体系仍存在许多制约因素,为了克服这些科学困难,构造具有高催化活性的纳米复合空气阴极成为主要研究方向~([4-5])。最近,碳材料负载贵金属作为锂-氧气电池复合阴极被广泛报道,表现出极高的电催化活性。基于此复合阴极的锂-氧气电池的循环寿命显著提高。然而,此空气阴极中贵金属催化剂的作用需更明晰的探究。本文采用磁控溅射方法,制备了钌/钯纳米粒子负载的碳纤维布作为锂-氧气电池的阴极。类比纯碳阴极,基于复合阴极的锂-氧气电池表现出极低的过电势,并具有较长循环寿命。然而利用先进的原位微分电化学质谱技术(DEMS)及红外光谱(IR)等分析发现,钌/钯纳米粒子,特别是钯在有效降低过电势同时,催化了电解液、碳基电极的分解,较大程度上破坏了锂-氧气电池的循环可逆性。此原创性实验结果有助于我们更好的认识锂-氧气电池中贵金属催化剂的作用。
The rechargeable Li-O_2 batteries would become the promising energy devices,due to their potential to afford significant gravimetric energy,much higher than Li-ion batteries.~([1-3]) However,this neotype battery is seriously impeded by numerous disadvantages.~([4-5]) It is essential to fabricate highly effective nano-structured cathode to conquer these challenges.Noble metal-carbon composite electrodes are widely investigated,exhibit efficient electro-catalysis and improved cycle performances.However,the function of noble metal catalyst should be further illustrated.In this work,Ru/Pd supported on CNT fabric sheets are fabricated by magnetron sputtering method.Li-O_2cells with this cathode deliver extremely low over-potentials.Nevertheless,differential electrochemical mass spectrometry(DEMS) and FT-IR analysis discover that exposed Ru/Pd catalysts drastically destroy the cells' cycle reversibility due to the degradation of electrolyte or electrode,especially Pd nanoparticles.This preliminary result gives us a new awareness about the function of noble metal catalyst in aprotic Li-O_2 battery.
The rechargeable Li-O_2 batteries would become the promising energy devices,due to their potential to afford significant gravimetric energy,much higher than Li-ion batteries.~([1-3]) However,this neotype battery is seriously impeded by numerous disadvantages.~([4-5]) It is essential to fabricate highly effective nano-structured cathode to conquer these challenges.Noble metal-carbon composite electrodes are widely investigated,exhibit efficient electro-catalysis and improved cycle performances.However,the function of noble metal catalyst should be further illustrated.In this work,Ru/Pd supported on CNT fabric sheets are fabricated by magnetron sputtering method.Li-O_2cells with this cathode deliver extremely low over-potentials.Nevertheless,differential electrochemical mass spectrometry(DEMS) and FT-IR analysis discover that exposed Ru/Pd catalysts drastically destroy the cells' cycle reversibility due to the degradation of electrolyte or electrode,especially Pd nanoparticles.This preliminary result gives us a new awareness about the function of noble metal catalyst in aprotic Li-O_2 battery.
引文
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[2]Peng,Z.;Freunberger,S.A.;Chen,Y.;Bruce,P.G.Science.2012,337:563.
[3]Bruce,P.G.;Freunberger,S.A.;Hardwick,L.J.;Tarascon,J.-M.Nat.Mater.2012,11:19.
[4]Luntz,A.C.;McCloskey,B.D.Chem.Rev.2014,114:11721.
[5]Li,F.;Zhang,T.Zhou,H.Energy Environ.Sci.2013,6:1125.