基于咪唑类离子液体电解质的硅空气电池制备研究
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- 英文论文题名：A silicon- air battery based imidazole ionic liquids electrolyte
- 论文作者：李宇杰 ; 潘亦真 ; 郑春满
- 英文论文作者：Yujie Li ; Yizheng Pan ; Chunman Zheng ; Department of Materials Science and Engineering ; School of Aerospace Science and Engineering ; National University of Defense Technology
- 年：2016
- 作者机构：国防科学技术大学航天科学与工程学院材料科学与工程系;
- 论文关键词：硅空气 ; 电池 ; 电化学反应 ; 离子液体
- 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：TM911.4
- 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：230k
- 原文格式：D
- 会议级别：全国
摘要
随着新能源技术的发展,锂-空、锌-空、铝-空等金属空气电池已成为化学电源的研究热点。硅空气电池在电化学反应原理上与金属空气电池类似,但又有其自身特点。理论上硅空气电池具有很高的能量密度(8470Wh/kg,21090Wh/L)~([1])。硅材料储量大、成本低,硅空气电池电化学反应产物为二氧化硅,无毒、可回收再利用。以色列Yair Ein-Eli等人在2009年首次制备出可持续放电的硅空气电池~([2]),其在新能源、有源电子器件等领域具有潜在应用前景。本文分析了硅空气电化学反应原理,硅负极反应为:Si+12(HF)_2F~-→SiF_4+8(HF)_3F~-+4e~-,空气正极反应分为两个步骤:O_2+12(HF)_3F~-+4e~-→2H_2O+16(HF)_2F~-,SiF_4+2H_2O+4(HF)_2F~-→SiO_2+4(HF)_3F~-,总体反应为:Si+O_2→SiO_2。(HF)_3F~-是反应中的电荷迁移物种,SiF_4须从负极迁移到正极发生反应,因此电解质必须可较好进行SiF_4传导。合成出特定咪唑类含F离子液体(EMI·(HF)_(2.3)F),以离子液体作为电解质,选用N型掺杂硅片为硅负极,采用自制空气正极,通过扣式封装方式组装硅空气电池,并测试其放电性能。电池在0.01mA放电电流下,放电30小时,放电容量为0.3mAh,但放电电压较低。将放电后的电池拆解分析,放电前硅负极表面光滑、平整。扫描电镜分析表明,放电后表面变粗糙,出现小孔,深度约为80-100nm左右。
Li-air,Zn-air,Al-air have been well studied along with the development of new energy technology,silicon- air battery is similar with them,and it has high theoretical energy density of 8470 Wh/kg~(-1) and21,090Wh/L~(-1),excluding O_2.Silicon is very plentiful and non-toxic,the reaction product SiO_2 is non-toxic,recoverable,so silicon- air battery has a multitude of applications at new energy and active electron device.Here,we analyzed electrochemical reaction mechanism of silicon- air battery,silicon cathode:Si +12(HF)_2F~-→SiF_4+ 8(HF)_3F~- + 4e~-,O_2 anode:O_2+ 12(HF)_3F~- + 4e~- →2H_2O + 16(HF)_2F~-,SiF_4 + 2H_2O +4(HF)_2F~- → SiO_2 + 4(HF)_3F~-,overall reaction:Si + O_2 → SiO_2.(HF)_3F~-is migration specie.EMI·(HF)_(2.3)F is synthesized as the electrolyte.N doped Si plate is as cathode,O_2 anode is prepared,silicon- air button cell is assembled.Its discharge time is 30 hours at current densities 100μm/cm~2,the capacity is 30 mAh.After discharge Silicon became rough and appear many small role with 80-100 nm of diameter.
Li-air,Zn-air,Al-air have been well studied along with the development of new energy technology,silicon- air battery is similar with them,and it has high theoretical energy density of 8470 Wh/kg~(-1) and21,090Wh/L~(-1),excluding O_2.Silicon is very plentiful and non-toxic,the reaction product SiO_2 is non-toxic,recoverable,so silicon- air battery has a multitude of applications at new energy and active electron device.Here,we analyzed electrochemical reaction mechanism of silicon- air battery,silicon cathode:Si +12(HF)_2F~-→SiF_4+ 8(HF)_3F~- + 4e~-,O_2 anode:O_2+ 12(HF)_3F~- + 4e~- →2H_2O + 16(HF)_2F~-,SiF_4 + 2H_2O +4(HF)_2F~- → SiO_2 + 4(HF)_3F~-,overall reaction:Si + O_2 → SiO_2.(HF)_3F~-is migration specie.EMI·(HF)_(2.3)F is synthesized as the electrolyte.N doped Si plate is as cathode,O_2 anode is prepared,silicon- air button cell is assembled.Its discharge time is 30 hours at current densities 100μm/cm~2,the capacity is 30 mAh.After discharge Silicon became rough and appear many small role with 80-100 nm of diameter.
引文
[1]D.D.Macdonald,Unpublished Calculations using HSC Chemistry,Outotec Research Oy,Pori,Finland.
[2]Gil C.;David S.;Rika H.;Digby D.M.;Yair E-E.Electrochemistry Communications 2009,11:1916-1918.
[2]Gil C.;David S.;Rika H.;Digby D.M.;Yair E-E.Electrochemistry Communications 2009,11:1916-1918.