Three-Dimensional Rigidity-Reinforced SiO_x Anodes with Stabilized Performance Using an Aqueous Multicomponent Binder Technology

Abstract

Three-dimensional (3D) rigidity-reinforced SiO x anodes are prepared using the aqueous multicomponent binders to stabilize the performances of lithium-ion batteries. Considering an elastic skeleton, adhesiveness, electrolyte absorption, etc., four kinds of binders [polyacrylamide (PAM), poly­(tetrafluoroethylene) (PTFE), carboxymethyl cellulose, and styrene butadiene rubber (SBR)] are selected to prepare aqueous multicomponent binders. The SiO x anodes with the binder PAM/SBR/PTFE (PSP) exhibit a 3D rigidity-reinforced structure, larger adhesive force, and moderate electrolyte adsorption capacity compared to other anodes with single and multicomponent binders. Specifically, the electrochemical performances of the SiO x anodes with the binder PSP663 are stabilized, and a retention capacity of 770 mAh g–1 at 500 mA g–1 after 300 cycles and a rate capacity of 993 mAh g–1 at 1200 mA g–1 are obtained. The enhanced performances are attributed to the good chemical stability of PTFE to protect SiO x particles from the electrolyte corrosion and to ensure electrode integrity. SBR acts as the binder backbone due to the strong adhesion force and specific three-dimensional structure. The rigidity of PAM limits the excessive expansion of SiO x particles well and shortens the ion migration. These results indicate that the 3D rigidity-reinforced SiO x anode with the aqueous binder PSP663 has promising prospects for practical application, and the results also provide a reference for solving the expansion problem of the silicon materials.

An Aqueous Alginate‐based Binder Modified with Zn2+ Ions and Prussian Blue Analogues for Enhanced Silicon Anodes

“…For Alg binder, the formed interchains between Alg binder and Si nanoparticles are mainly hydrogen bonding that is generated from carboxylic acid and hydroxyl groups, and this interchain force would be easily broken when facing to the huge volume changes of Si particles, which may result in mechanically fractured sites in the Si electrode and degrade battery performance. [35] In addition, the Si@AlgÀ Zn-PBAs electrode reaches a discharge capacity of 2903.3, 1609.5, 898.5 and 40.9 mAh g À 1 at a current density of 0.42, 2.1, 4.2 and 8.4 A g À 1 , respectively, which is much higher than that of Si@Alg and Si@AlgÀ Zn electrode (Figure 5e). This improved rate capacity may be resulted from the improved ionic conductivity of the AlgÀ Zn-PBAs binder.…”

“…Specifically, the specific discharge capacity of the Si@Alg and Si@Alg−Zn electrode after 200 cycles at 0.84 A g −1 decrease to 890.9 mAh g −1 with a capacity retention rate of 44.07% and 1152.3 mAh g −1 with a capacity retention rate of 58.08%, respectively. For Alg binder, the formed interchains between Alg binder and Si nanoparticles are mainly hydrogen bonding that is generated from carboxylic acid and hydroxyl groups, and this interchain force would be easily broken when facing to the huge volume changes of Si particles, which may result in mechanically fractured sites in the Si electrode and degrade battery performance [35] . In addition, the Si@Alg−Zn‐PBAs electrode reaches a discharge capacity of 2903.3, 1609.5, 898.5 and 40.9 mAh g −1 at a current density of 0.42, 2.1, 4.2 and 8.4 A g −1 , respectively, which is much higher than that of Si@Alg and Si@Alg−Zn electrode (Figure 5e).…”

Constructing a Resilient Hierarchical Conductive Network to Promote Cycling Stability of SiOx Anode via Binder Design

“…[15] Junmin Nan et al developed three-dimensional rigidity-reinforced SiO x anodes using the multicomponent binder. [16] Lin et al utilized a three-in-one design strategy to prepare all-integrated SiO x anode with high mass loading. [17] However, simply tuning mechanical properties of binders cannot fully address the existing issues as nonconductive binders are unable to perform as a well-connected electron transport network between active materials.…”

Water‐soluble Polyacrylate Copolymers as Green Binders of Graphite Anodes for High‐energy Density Lithium‐ion Pouch Cells with Enhanced Electrochemical and Safety Performance

“…[9,10] In addition to CMC and SBR water-based binders, it was found that polyacrylic acid (PAA) and polymers with similar structures were used to prepare the anode plate of LIBs instead of CMC and SBR. [11][12][13] The carboxyl groups in PAA and hydroxyl groups on the surface of anode active material can form hydrogen bonds, which can increase the slurry dispersion, adhesive strength, and cycle lifespan. [14][15][16][17] The aqueous PAA binders also have the advantages of environmental protection and low cost, so PAAs, related polymers, and their composites have recently been extensively developed as graphite anode binders.…”

“…However, from the perspective of practical application, the compaction density of the plate after the calendering treatment is low, and the low‐temperature discharge performance is not ideal [9,10] . In addition to CMC and SBR water‐based binders, it was found that polyacrylic acid (PAA) and polymers with similar structures were used to prepare the anode plate of LIBs instead of CMC and SBR [11–13] . The carboxyl groups in PAA and hydroxyl groups on the surface of anode active material can form hydrogen bonds, which can increase the slurry dispersion, adhesive strength, and cycle lifespan [14–17] .…”