SiO_x/C Composite Anode of Lithium-Ion Batteries with Enhanced Performances Using Multicomponent Binders

Abstract

A silicon suboxide−carbon (SiO x /C, 1 ≤ x ≤ 2) composite anode of lithium-ion batteries (LIBs) with enhanced performance is prepared using an aqueous multicomponent binder technology. Considering the adhesive force, electrolyte absorption, and stability, different binders including sodium alginate (SA), polyacrylamide gel (PAM), polytetrafluoroethylene (PTFE), and their composites are evaluated. It is indicated that compared to other anodes with single-or multicomponent binders, the SiO x /C composite anode with PAM/SA/PTFE663 (PSAP663) binders exhibits strong adhesion, moderate electrolyte absorption ability, and a specific capacity of 427 mA h g −1 charge−discharged at 0.5 A g −1 after 300 cycles. The improvement of electrochemical performance is attributed to the comprehensive effects of composite binders, including the adhesion of active substances, surface protection, solution adsorption, conductive path, and so on. These results show that the PSAP663 binder has promising potential for application, which not only gives alternative practical schemes of the green binders for the SiO x /C anodes but also provides ideas to develop a high-performance adhesive technology for LIBs.

Rational Design of Robust and Universal Aqueous Binders to Enable Highly Stable Cyclability of High‐Capacity Conversion and Alloy‐Type Anodes

“…This cycling performance is superior to all the previously reported SiO‐based microparticle anodes (Figure 2d). [ 40–45 ] Here, it should be noted that the CE efficiency is over 100% at the beginning of the cycle (Figure 2c), which is related to the measurement process. In this experiment, the electrode was first activated after one cycle of full (dis)charge.…”

“…More importantly, the SMHcontaining SA hybrid binder systems are also highly effective in improving the electrochemical performance of the conversion-type anodes, including Fe 2 O 3 , Fe 3 O 4 , and NiO, and the alloy-type Si anode (Figure S9, Supporting Information), indicating the universal robustness of the blended systems. PS [40] PSAP [45] PAA/PVA [44] PFM [43] CCB [42] SCMC [21] GG-CMC [41] PAA [19] this work SA/0.2SMH CMC [19] Reversible capacity (mAh g -1…”

“…Electrochemical properties of SiO electrodes fabricated with SA/xSMH binders. a) CV curves, b) cycling curves at 100 mA g À1, c) cycling curves with limited capacity of 1500 mAh g À1 at 100 mA g À1 of SiO electrodes, d) performance comparison of SiO microparticle electrodes fabricated with different binders,[19,21,[40][41][42][43][44][45] and e) cycling curves and corresponding coulombic efficiency of SiO/C¦¦LiNi 0.6 Mn 0.2 Co 0.2 O 2 pouch cells (5.4 Ah) with a current of 0.3C between 2.75 and 4.2 V.…”

In Situ Hydrogel Polymerization to Form a Flexible Polysaccharide Synergetic Binder Network for Stabilizing SiOx/C Anodes

“…To date, the nanosizing and coating of SiO x materials, as well as the use of high-performance water-based binders, have been proven to be effective methods for improving the performance of SiO x anodes. Considering the numerous types of binders and the diversity of their physical and chemical parameters, improving the performance of SiO x anodes through the binder approach has the advantages of low cost and good effects. − Kang et al studied the elastic skeleton, adhesion, and electrolyte absorption. Three-dimensional (3D) rigid reinforced SiO x anodes with polyacrylamide (PAM), polytetrafluoroethylene (PTFE), and carboxymethyl cellulose (CMC) aqueous binders were chosen to stabilize the performance of LIBs .…”