Combining electrochemistry and metallurgy for new electrode designs in Li-ion batteries
Combining electrochemistry and metallurgy for new electrode designs in Li-ion batteries
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DOI：
10.1021/cm0511825
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发表时间：
2005-09
影响因子：
8.6
通讯作者：
S. Grugeon;S. Laruelle;L. Dupont;F. Chevallier;P. Taberna;P. Simon;L. Gireaud;S. Lascaud;E. Vidal
中科院分区：
文献类型：
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作者：
S. Grugeon;S. Laruelle;L. Dupont;F. Chevallier;P. Taberna;P. Simon;L. Gireaud;S. Lascaud;E. Vidal
为了利用锂驱动的转化反应所提供的大的电化学容量优势，并克服动力学上的不足，报道了一种新的电极构型概念。这种电极设计的独创性嵌套在不锈钢的冶金方面，即由温度驱动的表面微结构的出现，使纳米结构、电化学活性的富铬氧化物表面层能够与电流收集器紧密接触。氧化层的厚度可达数百纳米，其根源在于铬向样品表面的优先迁移。我们进一步证明，在高温退火之前对不锈钢表面进行化学腐蚀，可以使富铬氧化物的可逆容量高达750mAh/g，至少循环800次。在建模的基础上，几种不同孔隙率的不锈钢/铬基氧化物集电体的场景显示了这种新的电极是如何.
To benefit from the large electrochemical capacity advantages offered by Li-driven conversion reactions and to overcome poor kinetics, a new electrode configuration concept is reported. The originality of this electrode design is nested in metallurgical aspects of stainless steel, namely, the appearance of temperature-driven surface microstructures that enable the growth of a nanostructured, electrochemically active, chromium-rich oxide surface layer in close contact with a current collector. The thickness of the oxide layer can reach hundreds of nanometers and is shown to be rooted in the preferential migration of Cr toward the sample surface. We further show that chemical etching of the stainless steel surface, prior to high-temperature annealing, enables reversible capacities as high as 750 mAh/g of chromium-rich oxide for at least 800 cycles. On the basis of modeling, several scenarios involving stainless steel/chromium-based oxides current collectors of various porosities show how this new electrode ...