Natural karaya gum as an excellent binder for silicon-based anodes in high-performance lithium-ion batteries

Bie, Yitian; Yang, Jun; Nuli, Yanna; Wang, Jiulin

doi:10.1039/c6ta09522d

Cited by 98 publications

(63 citation statements)

References 45 publications

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“…No obvious difference is observed between the pristine Si and the Si@SiO 2 samples, suggesting the modified surface oxide layer of SiO 2 is amorphous. [26,36,40] The FTIR results further confirm the enhanced interaction between the KGM binder and the active material of Si@SiO 2 with surface modification, being well consistent with the above results from our molecular mechanics simulations. The pristine Si nanoparticles exhibit two major peaks at 98.6 and 99.3 eV, which correspond to Si 2p 3/2 and Si 2p 1/2 excitations of elemental Si (0), respectively.…”

Section: Resultssupporting

confidence: 89%

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

Guo

et al. 2018

Advanced Energy Materials

154

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Silicon‐based anodes with high theoretical capacity have intriguing potential applications for next‐generation high‐energy lithium‐ion batteries, but suffer from huge volumetric change that causes pulverization of electrodes. Rational design and construction of effective electrode structures combined with versatile binders remain a significant challenge. Here, a unique natural binder of konjac glucomannan (KGM) is developed and an amorphous protective layer of SiO2 is fabricated on the surface of Si nanoparticles (Si@SiO2) to enhance the adhesion. Benefiting from a plethora of hydroxyl groups, the KGM binder with inherently high adhesion and superior mechanical properties provides abundant contact sites to active materials. Molecular mechanics simulations and experimental results demonstrate that the enhanced adhesion between KGM and Si@SiO2 can bond the particles tightly to form a robust electrode. In addition to bridging KGM molecules, the SiO2‐functionalized surface may serve as a buffer layer to alleviate the stresses of Si nanoparticles resulting from the volume change. The as‐fabricated KGM/Si@SiO2 electrode exhibits outstanding structural stability upon long‐term cycles. A highly reversible capacity of 1278 mAh g−1 can be achieved over 1000 cycles at a current density of 2 A g−1, and the capacity decay is as small as 0.056% per cycle.

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Section: Resultssupporting

confidence: 89%

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

Guo

et al. 2018

Advanced Energy Materials

154

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“…Figure a shows the long‐term cycling behavior of electrodes at a charge current density of 2100 mA g −1 (0.5 C; 1 C = 4200 mAh g −1 ) and a discharge current density of 840 mA g −1 (0.2 C) while controlling the voltage cutoff between 0.01 and 1.0 V. The initial discharge capacity of PAA–UPy anode reaches up to 4194 mAh g −1 , higher than that of anodes using PAA (3895 mAh g −1 ), CMC (3445 mAh g −1 ), and PVDF (3545 mAh g −1 ) as binders, suggesting the formation of a more stable SEI for the PAA–UPy anode. After 110 charge/discharge cycles, the PAA–UPy anode presents a reversible capacity of 2638 mAh g −1 , which is much higher than that of anodes using PAA (1734 mAh g −1 ), CMC (1099 mAh g −1 ), and PVDF (45 mAh g −1 ) as binders, and also higher than that in most reported works . Moreover, the cycling curve of PAA–UPy anode exhibits a more stable tendency when comparing with the other three, which is probably attributed to the excellent self‐healing ability of PAA–UPy that could instantly repair the damage or destruction caused by the volume variation of Si during repeated lithiation/delithiation.…”

Section: Resultsmentioning

confidence: 85%

A Quadruple‐Hydrogen‐Bonded Supramolecular Binder for High‐Performance Silicon Anodes in Lithium‐Ion Batteries

Zhang

Yang

Chen

et al. 2018

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With extremely high specific capacity, silicon has attracted enormous interest as a promising anode material for next-generation lithium-ion batteries. However, silicon suffers from a large volume variation during charge/discharge cycles, which leads to the pulverization of the silicon and subsequent separation from the conductive additives, eventually resulting in rapid capacity fading and poor cycle life. Here, it is shown that the utilization of a self-healable supramolecular polymer, which is facilely synthesized by copolymerization of tert-butyl acrylate and an ureido-pyrimidinone monomer followed by hydrolysis, can greatly reduce the side effects caused by the volume variation of silicon particles. The obtained polymer is demonstrated to have an excellent self-healing ability due to its quadruple-hydrogen-bonding dynamic interaction. An electrode using this self-healing supramolecular polymer as binder exhibits an initial discharge capacity as high as 4194 mAh g and a Coulombic efficiency of 86.4%, and maintains a high capacity of 2638 mAh g after 110 cycles, revealing significant improvement of the electrochemical performance in comparison with that of Si anodes using conventional binders. The supramolecular binder can be further applicable for silicon/carbon anodes and therefore this supramolecular strategy may increase the choice of amendable binders to improve the cycle life and energy density of high-capacity Li-ion batteries.

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“…So far, high‐areal‐capacity Si electrodes that work well at low current density have been reported. [ 25,29,42–44 ] However, areal current density is too small to meet the requirement of practical applications. Figure S14a, Supporting Information, shows that the Si@N‐P‐LiPN electrode can cycle very stably over 4 mAh cm −2 at 0.2 C (1.23 mA cm −2 ).…”

Section: Figurementioning

confidence: 99%

Silicon Anode with High Initial Coulombic Efficiency by Modulated Trifunctional Binder for High‐Areal‐Capacity Lithium‐Ion Batteries

Zhang

Liu

et al. 2020

Advanced Energy Materials

282

206

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storage and engineering heterogeneous structure for lithium transfer are the key for improving the energy density and rate performance of LIBs. [4][5][6][7][8] Silicon (Si), a naturally abundant material with outstanding theoretical capacity (4200 mAh g −1 ), has attracted extensive attention as an alternative promising anode for high-energydensity LIBs, which is ten times larger than the conventional graphite anode (372 mAh g −1 ). [9][10][11][12] However, Si inherently has large volume change that seriously undermines electrode integrity and solid electrolyte interface (SEI) film formed on the Si surface. Repairing and growth of the SEI film leads to reduced amount of available Liions, corresponding to the capacity decline of LIBs. [13][14][15] Generally, engineering Si materials is widely adopted to relieve the influence of large volume change and enhance lithium diffusion within the electrode. [16][17][18] However, high cost is barely accepted into the industry due to complex preparation process. Furthermore, most methods are not based on the mass-loading-oriented strategy for high-energy-density LIBs. [19] Binder is the key component in the electrode to bond active material and conductive additive together on current collector and keep electrode integrity during charge/discharge processes. [20][21][22] Recently, the functions of the binders, such as N-P-LiPN) is constructed by the partially lithiated hard polyacrylic acid as a framework and partially lithiated soft Nafion as a buffer via the hydrogen binding effect. N-P-LiPN has strong adhesion and mechanical properties to accommodate huge volume change of the Si anode. In addition, lithiumions are transferred via the lithiated groups of N-P-LiPN, which significantly enhances the ionic conductivity of the Si anode. Hence, the Si@N-P-LiPN electrodes achieve the highest initial Coulombic efficiency of 93.18% and a stable cycling performance for 500 cycles at 0.2 C. Specially, Si@N-P-LiPN electrodes demonstrate an ultrahigh-areal-capacity of 49.59 mAh cm −2 . This work offers a new approach for inspiring the battery community to explore novel binders for next-generation high-energy-density storage devices. High-capacity electrode materials play a vital role for high-energy-density lithium-ion batteries. Silicon (Si) has been regarded as a promising anode material because of its outstanding theoretical capacity, but it suffers from an inherent volume expansion problem. Binders have demonstrated improvements in the electrochemical performance of Si anodes. Achieving ultrahigh-areal-capacity Si anodes with rational binder strategies remains a significant challenge. Herein, a binder-lithiated strategy is proposed for ultrahigh-areal-capacity Si anodes. A hard/soft modulated trifunctional network binder (

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Natural karaya gum as an excellent binder for silicon-based anodes in high-performance lithium-ion batteries

Abstract: Natural karaya gum (KG), composed of multi-branched polysaccharides and glycoproteins, is proposed as a binder for high-performance silicon-based anodes.

Cited by 98 publications

References 45 publications

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

A Quadruple‐Hydrogen‐Bonded Supramolecular Binder for High‐Performance Silicon Anodes in Lithium‐Ion Batteries

Silicon Anode with High Initial Coulombic Efficiency by Modulated Trifunctional Binder for High‐Areal‐Capacity Lithium‐Ion Batteries

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Natural karaya gum as an excellent binder for silicon-based anodes in high-performance lithium-ion batteries

Abstract: Natural karaya gum (KG), composed of multi-branched polysaccharides and glycoproteins, is proposed as a binder for high-performance silicon-based anodes.

Cited by 98 publications

References 45 publications

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

A Quadruple‐Hydrogen‐Bonded Supramolecular Binder for High‐Performance Silicon Anodes in Lithium‐Ion Batteries

Silicon Anode with High Initial Coulombic Efficiency by Modulated Trifunctional Binder for High‐Areal‐Capacity Lithium‐Ion Batteries

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