Advances of polymer binders for silicon‐based anodes in high energy density lithium‐ion batteries

Abstract

Conventional lithium‐ion batteries (LIBs) with graphite anodes are approaching their theoretical limitations in energy density. Replacing the conventional graphite anodes with high‐capacity Si‐based anodes represents one of the most promising strategies to greatly boost the energy density of LIBs. However, the inherent huge volume expansion of Si‐based materials after lithiation and the resulting series of intractable problems, such as unstable solid electrolyte interphase layer, cracking of electrode, and especially the rapid capacity degradation of cells, severely restrict the practical application of Si‐based anodes. Over the past decade, numerous reports have demonstrated that polymer binders play a critical role in alleviating the volume expansion and maintaining the integrity and stable cycling of Si‐based anodes. In this review, the state‐of‐the‐art designing of polymer binders for Si‐based anodes have been systematically summarized based on their structures, including the linear, branched, crosslinked, and conjugated conductive polymer binders. Especially, the comprehensive designing of multifunctional polymer binders, by a combination of multiple structures, interactions, crosslinking chemistries, ionic or electronic conductivities, soft and hard segments, and so forth, would be promising to promote the practical application of Si‐based anodes. Finally, a perspective on the rational design of practical polymer binders for the large‐scale application of Si‐based anodes is presented.

A Self‐Healable Polyelectrolyte Binder for Highly Stabilized Sulfur, Silicon, and Silicon Oxides Electrodes

“…are widely applied as the binders for Si anodes either because they can form tolerable interfacial interactions with SiOH of SiO 2 layer on the surface of Si particles. [ 40 ] Actually, there are many commonalities in the construction strategies of S and Si electrodes, one might consider that a well‐designed binder can ideally satisfy the requirements of both S and Si electrodes.…”

Hydrothermal synthesis of nano spheroid‐like ZnMn 2 O 4 materials as high‐performance anodes for lithium‐ion batteries

“…42 The appropriate amount of carbon in ZnMn 2 O 4 can significantly improve its electrochemical performance. The diffraction patterns also showed that not only the diffraction peak of C but also the miscellaneous peaks of Mn 2 (CO) 10 and MnO 2 appear in the samples. As the temperature increased, the diffraction peaks of the sample become sharper, and its crystallinity was improved.…”

From 0D to 3D: Dimensional Control of Bismuth for Potassium Storage with Superb Kinetics and Cycling Stability

“…In the last three decades, lithium-ion batteries (LIBs) have achieved tremendous development and even changed people's lifestyles. [1][2][3][4][5][6] However, the limited lithium resources and uneven global distribution hinder its application in large-scale short ion diffusion length along the radial direction and fast electron transport along the 1D direction. Jiao et al prepared 1D Bi within a N, S co-doped carbon matrix as conductive framework and buffer layer, showing high rate capability (289 mA h g −1 at 6 A g −1 ).…”