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首页> 外文期刊>ACS applied materials & interfaces >Redesigning Multilayer Ceramic Capacitors by Preservation of Electrode Conductivity and Localized Doping
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Redesigning Multilayer Ceramic Capacitors by Preservation of Electrode Conductivity and Localized Doping

机译：通过保留电极电导率和局部掺杂来重新设计多层陶瓷电容器

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Both Li2CO3-coated nickel particles and fast firing technique were utilized in the manufacturing of MLCCs. They preserved the conductivity of Ni electrodes and provided the possibility of sintering the devices in oxidizing atmospheres. By using our method, the partial pressure of oxygen increased from 10(-10) atm in conventional methods to 10(-4) atm. The oxidizing atmosphere reduced the oxygen vacancy concentration as illustrated by the color change of the samples, and the results of EELS (electron energy loss spectroscopy). A systematic test with variable parameters, Li2CO3 coating, the sintering schedule, and the oxygen flow during sintering were executed, and the dissipation factor and the capacitance of the MLCCs were documented. Three type of MLCCs were studied: Conventional (fired with the conventional technique), Uncoated (fast fired with uncoated Ni particles), and Coated (fast fired with the coated Ni particles). The maximum oxygen activity during sintering (i.e., pO(2) = 1.2 x 10(-4) atm) was obtained for coated samples, and due to the minimum roV(O)(center dot center dot) concentration, their dissipation factor decreased up to 60% relative to the Conventional ones. In addition, the impedance spectroscopy, together with the map of Li ion distribution, suggested that Li ions accumulated around the electrode-dielectric interface and amplified the activation energy at these interfaces. This eventually caused the coated MLCCs to show higher capacitance than their uncoated counterparts. As a conclusion, it is shown that the manufacturing process described in this paper can provide a better MLCC with higher capacitance, and lower dissipation factor and leakage current.
机译：MLCC的制造中都使用了Li2CO3涂层的镍颗粒和快速焙烧技术。他们保留了镍电极的导电性，并提供了在氧化气氛中烧结器件的可能性。通过使用我们的方法，氧气的分压从常规方法中的10（-10）atm增加到10（-4）atm。如样品的颜色变化和EELS（电子能量损失谱）的结果所示，氧化气氛降低了氧空位浓度。对Li2CO3涂层，烧结时间表和烧结过程中的氧气流量进行了可变参数的系统测试，并记录了MLCC的耗散因数和电容。研究了三种类型的MLCC：常规（用常规技术烧结），未涂覆（用未涂覆的Ni颗粒快速烧结）和涂覆（用涂覆的Ni颗粒快速烧结）。对于涂层样品，获得了烧结过程中的最大氧活度（即pO（2）= 1.2 x 10（-4）atm），并且由于最小的roV（O）（中心点中心点）浓度，其耗散系数降低了相对于传统产品高达60％。此外，阻抗谱以及锂离子分布图表明锂离子在电极-电介质界面周围聚集并放大了这些界面处的活化能。最终，这导致了带涂层的MLCC的电容要高于未带涂层的MLCC。结论表明，本文描述的制造工艺可以提供具有更高电容，更低耗散因数和漏电流的更好的MLCC。

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