A Robust Ion‐Conductive Biopolymer as a Binder for Si Anodes of Lithium‐Ion Batteries

Abstract

Binders have been reported to play a key role in improving the cycle performance of Si anode materials of lithium‐ion batteries. In this study, the biopolymer guar gum (GG) is applied as the binder for a silicon nano­particle (SiNP) anode of a lithium‐ion battery for the first time. Due to the large number of polar hydroxyl groups in the GG molecule, a robust interaction between the GG binder and the SiNPs is achieved, resulting in a stable Si anode during cycling. More specifically, the GG binder can effectively transfer lithium ions to the Si surface, similarly to polyethylene oxide solid electrolytes. When GG is used as a binder, the SiNP anode can deliver an initial discharge capacity as high as 3364 mAh g−1, with a Coulombic efficiency of 88.3% at the current density of 2100 mA g−1, and maintain a capacity of 1561 mAh g−1 after 300 cycles. The study shows that the electrochemical performance of the SiNP anode with GG binder is significantly improved compared to that of a SiNP anode with a sodium alginate binder, and it demonstrates that GG is a promising binder for Si anodes of lithium‐ion batteries.

SiO2‐Enhanced Structural Stability and Strong Adhesion with a New Binder of Konjac Glucomannan Enables Stable Cycling of Silicon Anodes for Lithium‐Ion Batteries

“…27-1402) ( Figure 2f). [26,56] The frequency decrease of the KGM/Si@SiO 2 sample is much larger than that of the KGM/Si sample, indicating the stronger interaction between the KGM binder and the Si@SiO 2 nanoparticles. In order to clarify the detailed information on the surface, X-ray photoelectron spectroscopy (XPS) characterizations of the Si and Si@SiO 2 samples have been carried out and are shown in Figure 2g.…”

Trifunctional Electrode Additive for High Active Material Content and Volumetric Lithium‐Ion Electrode Densities

“…In PFA, Li diffuses between two neighboring O atoms with an energy barrier of 0.17 eV calculated with both PBE and HSE06. [30,31] The effect of PFA binder on the diffusion values of Li-ions would be further provided through electrochemical characterizations in the following discussion. One path is the metastable adsorption structure of PVDF1.…”

High Temperature Stable Separator for Lithium Batteries Based on SiO2 and Hydroxypropyl Guar Gum

“…Guar gums have been proved viable for electrochemical energy storage applications, such as binders for lithium titanium oxide (Li 4 Ti 5 O 12 or LTO) [16] and silicon [17,18,19] anodes in lithium-ion batteries and gel polymer electrolytes in super capacitors [20]. The advantages of using HPG compared with native guar gum are the enhanced water solubility and thermal stability [21].…”