BZCY-(Li/Na)_2CO_3新型复合电解质的性能
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摘要
采用均相共沉淀法合成Ba Zr_(0.1)Ce_(0.7)Y_(0.2)O_(2.9)(BZCY)粉体,并与碳酸盐复合制备不同配比的BZCY-(Li/Na)_2CO_3复合电解质。通过XRD、SEM、TG-DTA等分析方法对复合电解质粉末的结构与性能进行初步研究。结果表明,复合电解质中碳酸盐以无定形形态存在,BZCY与碳酸盐发生反应生成Ba CO_3杂相;复合电解质电导率在空气中600和450℃时分别可达0.095和0.071 S·cm~(-1),在加湿氢气中分别可达0.126和0.075 S·cm~(-1),复合电解质在空气中600℃时,400 h内长期电导率基本稳定在0.08~0.09 S·cm~(-1)。以BZCY-20%(Li/Na)_2CO_3为复合电解质的单电池表现出良好输出性能,在600和500℃时输出功率密度可达741和258 m W·cm~(-2)。600℃时0.6 A·cm~(-2)恒流放电,90 min内电池输出性能基本维持在300 m W·cm~(-2)以上。
BaZr_(0.1)Ce_(0.7)Y_(0.2)O_(2.9)(BZCY) powder was synthesized by a homogeneous coprecipitation method, and the powder was mixed with carbonate to prepare the compound with different ratios of(Li/Na)_2CO_3. The structure and electrical properties of the composite electrolytes were characterized by SEM, XRD and TG-DTA. The results show that the carbonate in the amorphous form exists in the composite electrolytes, which reacts with BZCY to form Ba CO_3. The conductivities of the composite electrolytes reach 0.095 S·cm~(-1) at 600 °C and 0.071 S·cm~(-1)at 450 °C in air, while 0.126 S·cm~(-1) at 600 °C and 0.075 S·cm~(-1) at 450 °C in humidified hydrogen. The conductivity of the composite electrolytes is basically stable for a long time in 0.08~0.09 S·cm~(-1) within 400 h at 600 °C. The single cell prepared with BZCY-20%(Li/Na)_2CO_3 composite electrolytes shows good output performance. The maximum power densities reach 741 m W·cm~(-2)at 600 °C and 258 m W·cm~(-2) at 500 °C. When discharging with 0.6 A·cm~(-2) at 600 °C, the output performance is basically kept above 300 m W·cm~(-2) within 90 min.
BaZr_(0.1)Ce_(0.7)Y_(0.2)O_(2.9)(BZCY) powder was synthesized by a homogeneous coprecipitation method, and the powder was mixed with carbonate to prepare the compound with different ratios of(Li/Na)_2CO_3. The structure and electrical properties of the composite electrolytes were characterized by SEM, XRD and TG-DTA. The results show that the carbonate in the amorphous form exists in the composite electrolytes, which reacts with BZCY to form Ba CO_3. The conductivities of the composite electrolytes reach 0.095 S·cm~(-1) at 600 °C and 0.071 S·cm~(-1)at 450 °C in air, while 0.126 S·cm~(-1) at 600 °C and 0.075 S·cm~(-1) at 450 °C in humidified hydrogen. The conductivity of the composite electrolytes is basically stable for a long time in 0.08~0.09 S·cm~(-1) within 400 h at 600 °C. The single cell prepared with BZCY-20%(Li/Na)_2CO_3 composite electrolytes shows good output performance. The maximum power densities reach 741 m W·cm~(-2)at 600 °C and 258 m W·cm~(-2) at 500 °C. When discharging with 0.6 A·cm~(-2) at 600 °C, the output performance is basically kept above 300 m W·cm~(-2) within 90 min.
引文
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[2]Goodenough J B.Materials Research[J],2003,12(33):357
[3]Demin A K,Tsiakaras P E,Sobyanin VA et al.Solid State Ionics[J],2002,152(12):555
[4]Sun W,Liu M,Liu W.Advance Energy Materials[J],2013,3(8):1041
[5]Liu M,Gao J,Liu X et al.International Hydrogen Energy[J],2011,36(21):13741
[6]Zuo C D,Zha S W,Liu M L et al.Advanced Materials[J],2016,18(24):3318
[7]Wang W,Su C,Ran R et al.Chem Sus Chem[J],2014,7(6):1719
[8]Song Shuxiang(宋书祥),Wang Yunlong(王云龙),Xia Changrong(夏长荣).Journal of Inorganic Materials(无机材料学报)[J],2014,29(12):1253
[9]Zhu B.Journal of Power Sources[J],2003,93(1-2):82
[10]Fang L,Wang C,Zhu B.Nano Energy[J],2012,1(4):631
[11]Fan L D,Wang C Y,Di J et al.Nanoscience and Nanotechnology-Asia[J],2012,12:4941
[12]Iguchi F,Yamada T,Sata N et al.Solid State Ionics[J],2006,177:2381
[13]Hibino T,Hashimoto A.Journal of the Electrochemical Society[J],2002,149:1503
[14]Ma Y,Wang X,Raza R et al.International Journal of Hydrogen Energy[J],2010,35(7):2580