Properties of NiO cathode coated with lithiated Co and Ni solid solution oxide for MCFCs
Properties of NiO cathode coated with lithiated Co and Ni solid solution oxide for MCFCs
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DOI：
10.1016/s0378-7753(99)00416-4
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发表时间：
2000-03-01
影响因子：
9.2
通讯作者：
Naito, M
中科院分区：
文献类型：
--
作者：
Fukui, T;Ohara, S;Naito, M
熔融碳酸盐燃料电池(MCFCs)在熔融碳酸盐中的溶解和沉积导致电池短路是一个必须解决的大问题。为了解决这一问题，我们提出了一种新的阴极结构，即用通常的流延方法在NiO颗粒上覆盖LiCoO2颗粒，因为LiCoO2在碳酸盐熔体中比NiO更稳定。用CoO/Ni复合粒子可以制备出钙质量分数为5~20%的CoO/NiO复合材料，经扫描电子显微镜证实，这种复合材料是由覆盖有Li(Co，Ni)氧化物外层的NiO核组成。与传统NiO相比，CoO质量分数为5%的Li化CoO/NiO复合材料在MCFCs中的稳定性显著提高。通过原位氧化和锂化工艺成功地制备了锂化CoO/NiO复合材料。我们认为，这种由包覆Li(Co，Ni)氧化物的NiO核组成的复合阴极材料将被用作MCFCs的新型阴极。(C)2000 Elsevier Science S.A.保留所有权利。
The short circuit of cells due to the dissolution and the deposition of NiO in a molten carbonate is a big problem that has to be resolved if we want to use Molten Carbonate Fuel Cells (MCFCs) for long-term operation. To resolve this problem, we have proposed a new cathode structure in which NiO grains have been coated with LiCoO2 grains by usual tape casting method, because LiCoO2 is more stable in a carbonate melt than NiO. CoO/NiO composites with 5 to 20 mass% Ca could be formed by using the CoO/Ni composite particles; As confirmed by SEM, these composites consisted of NiO cores covered with the outer layer of Li(Co, Ni) oxide. The stability of the lithiated CoO/NiO composite with 5 mass% CoO was significantly improved in comparison with that of conventional NiO for MCFCs. The lithiated CoO/NiO composite was also successfully formed by in-situ oxidation and lithiation process. We thought that this composite cathode material consisting of NiO core covered with Li(Co, Ni) oxide will be adopted as the new cathode for MCFCs. (C) 2000 Elsevier Science S.A. All rights reserved.