Dynamic bonded supramolecular binder enables high-performance silicon anodes in lithium-ion batteries

Cao, Zhang; Zheng, Xueying; Huang, Weibo; Wang, Yan; Qu, Qunting; Zheng, Honghe

doi:10.1016/j.jpowsour.2020.228208

Cited by 70 publications

(44 citation statements)

References 66 publications

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“…New absorption peaks located at 1305 and 670 cm −1 appear in GN-BA (90V10) cross-linked binder, corresponding to BNC and OBO bonds, respectively. [44] This result confirms the cross-linking effects between GA and BA through the formation of BN bonds (Figure 1d). FTIR spectra of the S@GN-BA electrodes before and after cycling have also been performed (Figure S1, Supporting Information).…”

Section: Resultssupporting

confidence: 79%

“…So the B ions in BA can coordinate with the NH 2 and COOH electron donor groups in GN to form a cross-linked structure, as displayed in Figure 1b. [44] BA is not only used as ionic cross-linking agents for durable network structures, but also as polysulfides adsorbent by chemical binding. In addition, hydrogen bonds are also formed between BOH in BA and COOH/NH 2 in GN, further improving the stability of the cross-linked binder.…”

Section: Resultsmentioning

confidence: 99%

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Water‐Soluble Cross‐Linking Functional Binder for Low‐Cost and High‐Performance Lithium–Sulfur Batteries

Sun

Shi

et al. 2021

Adv Funct Materials

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Binders play an important role in battery systems. The lithium-sulfur (Li-S) batteries have poor cycling performance owing to large volume alteration of sulfur and shuttle effect. Herein, a novel water-soluble functional binder (named GN-BA) is prepared by the cross-linking effect between gelatin and boric acid. The excellent binder can effectively maintain the integrated electrode stable, buffer the volume changes, prevent active materials exfoliation from current collectors, and anchor polysulfides by chemical bonding. Sulfur electrodes in this binder also exhibit a loosely stacked porous structure, which is advantageous to the electrolyte permeation and fast ion diffusion. X-ray photoelectron spectroscopy, ultraviolet-visible spectroscopy, and density functional theory calculations further verified that the binder can anchor polysulfides by forming BOLi, COLi, and CNLi chemical bonds. At 0.5 C, a high initial capacity of 980 mA h g −1 can be obtained, which is higher than those sulfur cathodes with traditional poly(vinylidene fluoride) binder. When the sulfur loading is up to 5.0 mg cm −2 , a high areal specific capacity of 5.7 mA h cm −2 and excellent cycling stability are achieved. This study proposes an economical and environmentally friendly strategy for the construction of advanced binders and promotes the practical application of high-energy Li-S batteries.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Water‐Soluble Cross‐Linking Functional Binder for Low‐Cost and High‐Performance Lithium–Sulfur Batteries

Sun

Shi

et al. 2021

Adv Funct Materials

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“…Among the candidates for high energy density anodes, silicon (Si) is a promising candidate due to the high theoretical capacity of 4200 mAh g −1 , which is much larger than that of representative anode materials, carbon (372 mAh g −1 ) [6][7][8][9][10]. However, it has not been commercialized yet because of some critical issues including the mechanical integrity by large volume changes in the course of Li intercalations (i.e., mechanical stability) and formation of a SEI (solid electrolyte interface) layer on the surface of Si electrodes (i.e., electrochemical stability).…”

Section: Introductionmentioning

confidence: 99%

Enhanced capacity retention based silicon nanosheets electrode by CMC coating for lithium-ion batteries

Park

et al. 2021

Electron. Mater. Lett.

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Si nanosheets (SiNS) as two dimensional Si nanomaterials are promising candidates for anodes of lithium ion batteries (LIBs) by their large surface area and excellent mechanical durability. In this study, we fabricated polymeric binder (carboxymethyl cellulose, CMC) coated SiNS electrodes using a spin-coating process and characterized the electrochemical properties. The CMS coated SiNS electrodes were homogeneously covered with a CMC polymer layer and showed the improved capacity retention with maintaining over 90% of initial capacity after several cycles. The result of electrochemical impedance spectroscopy indicates that the CMC layer provide the chemical stability of Si surface and suppress the continuous growth of the SEI layer. Furthermore, CMC coated layer on SiNS provide improved mechanical stability that maintains the adhesion of SiNS to the current collector during the discharge-charge cycles.

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“…In the process of inorganic-polymer cross-linking, the inorganic substance can also be chemically bonded to Si through its own group. For example, Cao et al [122] used inorganic boric acid (BA) and PVA skeleton to form a 3D network structure binder. In addition to improving the binder's mechanical properties, the BOH group can also be chemically bonded to the surface of the Si by condensation reaction with the SiOH group.…”

Section: Polymer Cross-linking With Inorganicsmentioning

confidence: 99%

Key Factors for Binders to Enhance the Electrochemical Performance of Silicon Anodes through Molecular Design

Wang

et al. 2021

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Silicon is considered the most promising candidate for anode material in lithium‐ion batteries due to the high theoretical capacity. Unfortunately, the vast volume change and low electric conductivity have limited the application of silicon anodes. In the silicon anode system, the binders are essential for mechanical and conductive integrity. However, there are few reviews to comprehensively introduce binders from the perspective of factors affecting performance and modification methods, which are crucial to the development of binders. In this review, several key factors that have great impact on binders’ performance are summarized, including molecular weight, interfacial bonding, and molecular structure. Moreover, some commonly used modification methods for binders are also provided to control these influencing factors and obtain the binders with better performance. Finally, to overcome the existing problems and challenges about binders, several possible development directions of binders are suggested.

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Dynamic bonded supramolecular binder enables high-performance silicon anodes in lithium-ion batteries

Cited by 70 publications

References 66 publications

Water‐Soluble Cross‐Linking Functional Binder for Low‐Cost and High‐Performance Lithium–Sulfur Batteries

Water‐Soluble Cross‐Linking Functional Binder for Low‐Cost and High‐Performance Lithium–Sulfur Batteries

Enhanced capacity retention based silicon nanosheets electrode by CMC coating for lithium-ion batteries

Key Factors for Binders to Enhance the Electrochemical Performance of Silicon Anodes through Molecular Design

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