材料科学
炭黑
石墨
导电体
阳极
导线
内阻
碳纤维
光电子学
电荷(物理)
硅
纳米技术
复合材料
电极
功率(物理)
化学
复合数
物理
物理化学
天然橡胶
量子力学
电池(电)
作者
Fabian Jeschull,Sigita Trabesinger
标识
DOI:10.1002/batt.202000177
摘要
Abstract 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.
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