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Fast‐Charge Limitations for Graphite Anodes with Si as Capacity‐Enhancing Additive
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-08-17 , DOI: 10.1002/batt.202000177 Fabian Jeschull 1 , Sigita Trabesinger 1
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-08-17 , DOI: 10.1002/batt.202000177 Fabian Jeschull 1 , Sigita Trabesinger 1
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Rate capability is always coming into the question when new materials are characterized; however, this question also arises when blends of different electroactive materials are used. This study was dedicated to the charge capabilities of graphite‐Si blends, in which Si acts as a capacity‐enhancing electrode additive (≤20 wt.% Si). As delithiated Si is considered poorly electronic conductor, one would assume that the presence of Si induces additional internal resistance that hampers fast charging of this type of electrodes. Current‐interruption measurements demonstrate that the internal resistance of graphite‐Si blends increases proportionally to the amount of Si in the electrode. This is also reflected in the respective charge capability tests, where electrodes with smaller Si content showed better power performance. With the aim to improve the charge capability of the electrode formulations, two approaches were evaluated: 1) addition of various amounts of conductive additive in the form of carbon black and 2) densification of electrodes. While the charge capability could be successfully improved by increasing carbon black content, densification mainly lead to performance deterioration.
中文翻译：
硅作为容量增强添加剂的石墨阳极的快速充电限制
当表征新材料时，速率能力一直是个问题。然而，当使用不同电活性材料的混合物时，也会出现这个问题。这项研究致力于石墨-硅共混物的充电能力，其中硅作为增强容量的电极添加剂（≤20 wt。％Si）。由于去硅化的硅被认为是不良的电子导体，因此可以认为硅的存在会引起额外的内阻，从而阻碍这种类型电极的快速充电。电流中断测量表明，石墨-硅混合物的内阻与电极中硅的含量成比例地增加。这也反映在各自的充电能力测试中，其中具有较小Si含量的电极表现出更好的功率性能。为了提高电极配方的充电能力，评估了两种方法：1）添加各种量的炭黑形式的导电添加剂，以及2）电极致密化。虽然可以通过增加炭黑含量来成功改善充电能力，但致密化主要导致性能下降。
更新日期：2020-08-17
中文翻译：
硅作为容量增强添加剂的石墨阳极的快速充电限制
当表征新材料时，速率能力一直是个问题。然而，当使用不同电活性材料的混合物时，也会出现这个问题。这项研究致力于石墨-硅共混物的充电能力，其中硅作为增强容量的电极添加剂（≤20 wt。％Si）。由于去硅化的硅被认为是不良的电子导体，因此可以认为硅的存在会引起额外的内阻，从而阻碍这种类型电极的快速充电。电流中断测量表明，石墨-硅混合物的内阻与电极中硅的含量成比例地增加。这也反映在各自的充电能力测试中，其中具有较小Si含量的电极表现出更好的功率性能。为了提高电极配方的充电能力，评估了两种方法：1）添加各种量的炭黑形式的导电添加剂，以及2）电极致密化。虽然可以通过增加炭黑含量来成功改善充电能力，但致密化主要导致性能下降。
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