Interface Engineering Enables Wide‐Temperature Li‐Ion Storage in Commercial Silicon‐Based Anodes

阳极 法拉第效率 电解质 材料科学 化学工程 涂层 纳米技术 光电子学 电极 化学 物理化学 工程类
作者
Chenwu Zhang,Fengjun Ji,Deping Li,Tiansheng Bai,Hongqiang Zhang,Weihao Xia,Xiuling Shi,Kaikai Li,Jingyu Lu,Yu Wang,Lijie Ci
出处
期刊:Small [Wiley]
卷期号:21 (28): e2310633-e2310633 被引量:12
标识
DOI:10.1002/smll.202310633
摘要

Silicon-based materials have been considered potential anode materials for next-generation lithium-ion batteries based on their high theoretical capacity and low working voltage. However, side reactions at the Si/electrolyte interface bring annoying issues like low Coulombic efficiency, sluggish ionic transport, and inferior temperature compatibility. In this work, the surface Al2O3 coating layer is proposed as an artificial solid electrolyte interphase (SEI), which can serve as a physical barrier against the invasion of byproducts like HF(Hydrogen Fluoride) from the decomposition of electrolyte, and acts as a fast Li-ion transport pathway. Besides, the intrinsically high mechanical strength can effectively inhibit the volume expansion of the silicon particles, thus promoting the cyclability. The as-assembled battery cell with the Al2O3-coated Si-C anode exhibits a high initial Coulombic efficiency of 80% at RT and a capacity retention ratio up to ≈81.9% after 100 cycles, which is much higher than that of the pristine Si-C anode (≈74.8%). Besides, the expansion rate can also be decreased from 103% to 50%. Moreover, the Al2O3-coated Si-C anode also extends the working temperature from room temperature to 0 °C-60 °C. Overall, this work provides an efficient strategy for regulating the interface reactions of Si-based anode and pushes forward the practical applications at real conditions.
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