The Role of Polymer and Inorganic Coatings to Enhance Interparticle Connections Diagnosed by <i>In Situ</i> Techniques.
basic_science · Level V
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- Record sourced from PubMed, PMID 33508942.
- Also identified by DOI 10.1021/acs.nanolett.0c05035.
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Abstract
Surface coating on alloy anodes renders an effective remedy to tolerate internal stress and alleviate the side reaction with electrolytes for long-lasting reversible lithium redox reactions in lithium-ion batteries. However, the role of surface coating on the interparticle connections of alloy anodes remains not fully understood. Herein, we exploit real-time lithiation and mechanic measurement of SnO<sub>2</sub> nanoparticles via <i>in situ</i> TEM with different coating layers, including conducting polymer polypyrrole and metal oxide MnO<sub>2</sub>. As a result, polypyrrole is more flexible to accommodate the volume expansion issue. More importantly, the polypyrrole coating layers offer a large contact area and strong adhesion force between the SnO<sub>2</sub> nanoparticles, ensuring fast lithiation kinetics and high cycling stability. These observations provide new insight into how the interparticle connections of alloy anodes with diverse coating approaches can impact battery performance, shedding light on the practical processing of the alloy anode materials for high-energy Li-ion batteries.