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Open accessJournal ArticleDOI: 10.1002/ADVS.202004290

Zn 2+-Imidazole Coordination Crosslinks for Elastic Polymeric Binders in High-Capacity Silicon Electrodes

02 Mar 2021-Advanced Science (John Wiley & Sons, Ltd)-Vol. 8, Iss: 9, pp 2004290-2004290
Abstract: Recent research has built a consensus that the binder plays a key role in the performance of high-capacity silicon anodes in lithium-ion batteries. These anodes necessitate the use of a binder to maintain the electrode integrity during the immense volume change of silicon during cycling. Here, Zn2+-imidazole coordination crosslinks that are formed to carboxymethyl cellulose backbones in situ during electrode fabrication are reported. The recoverable nature of Zn2+-imidazole coordination bonds and the flexibility of the poly(ethylene glycol) chains are jointly responsible for the high elasticity of the binder network. The high elasticity tightens interparticle contacts and sustains the electrode integrity, both of which are beneficial for long-term cyclability. These electrodes, with their commercial levels of areal capacities, exhibit superior cycle life in full-cells paired with LiNi0.8Co0.15Al0.05O2 cathodes. The present study underlines the importance of highly reversible metal ion-ligand coordination chemistries for binders intended for high capacity alloying-based electrodes.

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Open access
29 Apr 2015-
Abstract: Silicon has attracted ever-increasing attention as a high-capacity anode material in Li-ion batteries owing to its extremely high theoretical capacity. However, practical application of silicon anodes is seriously hindered by its fast capacity fading as a result of huge volume changes during the charge/discharge process. Here, an interpenetrated gel polymer binder for high-performance silicon anodes is created through in-situ crosslinking of water-soluble poly(acrylic acid) (PAA) and polyvinyl alcohol (PVA) precursors. This gel polymer binder with deformable polymer network and strong adhesion on silicon particles can effectively accommodate the large volume change of silicon anodes upon lithiation/delithiation, leading to an excellent cycling stability and high Coulombic efficiency even at high current densities. Moreover, high areal capacity of ∼4.3 mAh/cm2 is achieved based on the silicon anode using the gel PAA–PVA polymer binder with a high mass loading. In view of simplicity in using the water soluble gel polymer binder, it is believed that this novel binder has a great potential to be used for high capacity silicon anodes in next generation Li-ion batteries, as well as for other electrode materials with large volume change during cycling.

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Topics: Lithium (62%), Silicon (50%)

305 Citations



Journal ArticleDOI: 10.1016/J.COMPOSITESB.2021.109253
Bingbing Gao1, Bingbing Gao2, Jiahui Yang1, Yukun Chen1  +2 moreInstitutions (2)
Abstract: Oxidized cellulose nanocrystal (OCNC) prepared by H2O2 served as anchorage sites of combined Zn2+-carboxylate bonds and curing agent precursor for fabricating XNBR/OCNC/ZnO composite via in situ interfacial reactions. The novel cross-linking by OCNC influenced on the microstructure, morphology, and properties of the composites were characterized. The cross-linking of Zn2+-carboxylate networks endow the composites to achieve 295% and 200% increases in tensile strength and cross-linking density, excellent wear resistance (90% reduction in relative mass loss compared to neat XNBR), irradiation aging resistance, respectively. This study provides a universal, simple and scalable method for the fabrication of multifunctional rubber composites by constructing Zn2+-carboxylate cross-linked network with natural cellulose resources.

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Topics: Nitrile rubber (52%), Oxidized cellulose (52%)

Open accessJournal ArticleDOI: 10.3389/FCHEM.2021.712225
Wenqiang Zhu1, Junjian Zhou1, Shuang Xiang1, Xueting Bian1  +3 moreInstitutions (1)
Abstract: Silicon (Si) has been counted as the most promising anode material for next-generation lithium-ion batteries, owing to its high theoretical specific capacity, safety, and high natural abundance. However, the commercial application of silicon anodes is hindered by its huge volume expansions, poor conductivity, and low coulombic efficiency. For the anode manufacture, binders play an important role of binding silicon materials, current collectors, and conductive agents, and the binder structure can significantly affect the mechanical durability, adhesion, ionic/electronic conductivities, and solid electrolyte interface (SEI) stability of the silicon anodes. Moreover, many cross-linked binders are effective in alleviating the volume expansions of silicon nanosized even microsized anodic materials along with maintaining the anode integrity and stable electrochemical performances. This mini review comprehensively summarizes various binders based on their structures, including the linear, branched, three-dimensional (3D) cross-linked, conductive polymer, and other hybrid binders. The mechanisms how various binder structures influence the performances of the silicon anodes, the limitations, and prospects of different hybrid binders are also discussed. This mini review can help in designing hybrid polymer binders and facilitating the practical application of silicon-based anodes with high electrochemical activity and long-term stability.

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Topics: Silicon (53%), Anode (51%)


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77 results found


Journal ArticleDOI: 10.1126/SCIENCE.1212741
18 Nov 2011-Science
Abstract: The increasing interest in energy storage for the grid can be attributed to multiple factors, including the capital costs of managing peak demands, the investments needed for grid reliability, and the integration of renewable energy sources. Although existing energy storage is dominated by pumped hydroelectric, there is the recognition that battery systems can offer a number of high-value opportunities, provided that lower costs can be obtained. The battery systems reviewed here include sodium-sulfur batteries that are commercially available for grid applications, redox-flow batteries that offer low cost, and lithium-ion batteries whose development for commercial electronics and electric vehicles is being applied to grid storage.

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Topics: Grid energy storage (67%), Intermittent energy source (65%), Energy storage (63%) ... show more

8,906 Citations


Journal ArticleDOI: 10.1038/NNANO.2007.411
Candace K. Chan1, Hailin Peng1, Gao Liu2, Kevin McIlwrath3  +3 moreInstitutions (3)
Abstract: There is great interest in developing rechargeable lithium batteries with higher energy capacity and longer cycle life for applications in portable electronic devices, electric vehicles and implantable medical devices. Silicon is an attractive anode material for lithium batteries because it has a low discharge potential and the highest known theoretical charge capacity (4,200 mAh g(-1); ref. 2). Although this is more than ten times higher than existing graphite anodes and much larger than various nitride and oxide materials, silicon anodes have limited applications because silicon's volume changes by 400% upon insertion and extraction of lithium which results in pulverization and capacity fading. Here, we show that silicon nanowire battery electrodes circumvent these issues as they can accommodate large strain without pulverization, provide good electronic contact and conduction, and display short lithium insertion distances. We achieved the theoretical charge capacity for silicon anodes and maintained a discharge capacity close to 75% of this maximum, with little fading during cycling.

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Topics: Nanowire battery (62%), Lithium battery (62%), Lithium (58%) ... show more

5,578 Citations


Journal ArticleDOI: 10.1038/NATREVMATS.2016.13
Jang Wook Choi1, Doron Aurbach2Institutions (2)
Abstract: Energy density is the main property of rechargeable batteries that has driven the entire technology forward in past decades. Lithium-ion batteries (LIBs) now surpass other, previously competitive battery types (for example, lead–acid and nickel metal hydride) but still require extensive further improvement to, in particular, extend the operation hours of mobile IT devices and the driving mileages of all-electric vehicles. In this Review, we present a critical overview of a wide range of post-LIB materials and systems that could have a pivotal role in meeting such demands. We divide battery systems into two categories: near-term and long-term technologies. To provide a realistic and balanced perspective, we describe the operating principles and remaining issues of each post-LIB technology, and also evaluate these materials under commercial cell configurations. Post-lithium-ion batteries are reviewed with a focus on their operating principles, advantages and the challenges that they face. The volumetric energy density of each battery is examined using a commercial pouch-cell configuration to evaluate its practical significance and identify appropriate research directions.

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Topics: Battery (electricity) (61%)

2,362 Citations


Journal ArticleDOI: 10.1038/NMAT2725
01 Apr 2010-Nature Materials
Abstract: Si-based Li-ion battery anodes have recently received great attention, as they offer specific capacity an order of magnitude beyond that of conventional graphite. The applications of this transformative technology require synthesis routes capable of producing safe and easy-to-handle anode particles with low volume changes and stable performance during battery operation. Herein, we report a large-scale hierarchical bottom-up assembly route for the formation of Si on the nanoscale--containing rigid and robust spheres with irregular channels for rapid access of Li ions into the particle bulk. Large Si volume changes on Li insertion and extraction are accommodated by the particle's internal porosity. Reversible capacities over five times higher than that of the state-of-the-art anodes (1,950 mA h g(-1)) and stable performance are attained. The synthesis process is simple, low-cost, safe and broadly applicable, providing new avenues for the rational engineering of electrode materials with enhanced conductivity and power.

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Topics: Battery (electricity) (52%), Anode (51%)

1,768 Citations


Journal ArticleDOI: 10.1016/J.NANTOD.2012.08.004
Hui Wu1, Yi Cui2, Yi Cui1Institutions (2)
01 Oct 2012-Nano Today
Abstract: Summary High energy lithium ion batteries are in demand for consumer electronics, electric-drive vehicles and grid-scale stationary energy storage. Si is of great interest since it has 10 times higher specific capacity than traditional carbon anodes. However, the poor cyclability due to the large volume change of Si upon insertion and extraction of lithium has been an impediment to its deployment. This review outlines three fundamental materials challenges associated with large volume change, and then shows how nanostructured materials design can successfully address these challenges. There have been three generations of nanostructure design, encompassing solid nanostructures such as nanowires, hollow nanostructures, and clamped hollow structures. The nanoscale design principles developed for Si can also be extended to other battery materials that undergo large volume changes.

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Topics: Lithium-ion battery (58%), Lithium (52%), Battery (electricity) (52%) ... show more

1,472 Citations