New Formulations of High-Voltage Cathodes for Li-Ion Batteries with Water-Processable Binders

Bigoni, Francesca; Giorgio, Francesca De; Soavi, Francesca; Arbizzani, Catia

doi:10.1149/07301.0249ecst

Cited by 5 publications

(6 citation statements)

References 15 publications

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“…In the same cycling conditions LNMO_PVdF is less stable displaying a 89% recovered charge after 85 cycles. 41 The Figure also displays the potential profiles of the 1st and the 100th cycle at 1C (i.e. the 5th and 105th total cycles) of LNMO_SA that shows a low increment of the discharge overpotential over cycling.…”

Section: Resultsmentioning

confidence: 99%

Sodium Alginate: A Water-Processable Binder in High-Voltage Cathode Formulations

Bigoni

Giorgio

Soavi

et al. 2016

J. Electrochem. Soc.

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Binders are electrochemically inactive electrode components. However, their chemical and physical nature greatly affects battery performance and plays a key role in electrode integrity and interface reactivity. The binders thus have a strong impact on battery capacity retention and cycle life. Water-processable binders would make the electrode preparation process cheap and environmentally friendly and provide a viable alternative to polyvinylidene difluoride (PVdF). Here we report the use of sodium alginate (SA) as binder for LiNi 0.5 Mn 1.5 O 4 (LNMO), one of the most promising cathode materials for high-voltage and high-energy LIBs. We demonstrate that electrodes with high mass loading containing SA have excellent specific discharge capacity (120 mAh g −1 at C/3 and 100 mAh g −1 at 5C) with negligible overpotentials in conventional electrolyte based on ethylene carbonate (EC): dimethyl carbonate (DMC) and 1 M LiPF 6 , where the reactivity of LNMO is known to negatively affect stability. The electrodes with SA also show a good stability over subsequent cycles of charge and discharge at 1C with capacity retention of 95% and 86% with respect to the initial cycles at the 100th and 200th cycle. Lithium-ion batteries (LIBs) have been on the market for 25 years and recently are being widely used in electric vehicles.1,2 Research is currently focused on improving the safety and performance of LIBs in terms of gravimetric and volumetric energy and power as well as reducing the costs and toxicity of battery components and of the manufacturing process.3,4 While the three main active battery components, i.e. anode, cathode and electrolyte, are widely studied, as shown by numerous review papers, [5][6][7][8] it is worth noting that such inactive battery components as separators are extremely important in overall operation. 9 The same holds true for the conductive agent (usually carbon black) and the binder that support the electrochemical processes even if present in low weight percentages in electrode composite. The former improves electronic conductivity and, hence, the rate capability of the electrode. The latter acts as glue for active material and the conductive agent and can also improve adhesion with the current collector. Although electrochemically inactive, the chemical and physical nature of polymeric binders can enhance battery performance, control the interface structure of the electrode and has a strong impact on battery capacity retention and cycle life. 10The most widely used binder for LIBs is polyvinylidene difluoride (PVdF). While displaying all the desirable binder properties, such as good adhesion strength to the current collector and good electrochemical stability, it can also soak up a large amount of liquid electrolyte, a property that has its pros and cons.11 A facile penetration of the electrolyte inside the composite electrode results in a high interfacial area of active material in contact with the electrolyte. While this facilitates Li + transport, it also promotes unwanted side-reactions. Furth...

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Section: Resultsmentioning

confidence: 99%

Sodium Alginate: A Water-Processable Binder in High-Voltage Cathode Formulations

Bigoni

Giorgio

Soavi

et al. 2016

J. Electrochem. Soc.

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“…Its greater stiffness is attributed to the presence of hydroxy and carboxy groups in the alginate structure, which can improve the cycling performance of Si electrode in Li cell by suppressing electrode expansion . The cycling performance of cathode materials, such as LiMn 2 O 4 and LiNi 0.5 Mn 1.5 O 4 , can also be improved by exploiting the ability of alginate to form hydrogels with di- or multivalent metal ions, such as Mn 2+ , thus solving the problematic leaching. − However, the impact of electrolyte decomposition on the extent of Mn 2+ leaching in cells with alginate binders has not been extensively investigated. In addition, although the replacement of PVdF by lithium dextran sulfate was reported to suppress electrolyte decomposition, the effects of binder sulfation on the electrochemical properties and electrode surface conditions of the corresponding cells are not fully understood.…”

Section: Introductionmentioning

confidence: 99%

Sulfated Alginate as an Effective Polymer Binder for High-Voltage LiNi_0.5Mn_1.5O₄ Electrodes in Lithium-Ion Batteries

Oishi

Tatara

Togo

et al. 2022

ACS Appl. Mater. Interfaces

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Although the increasing demand for high-energy-density lithium-ion batteries (LIBs) has inspired extensive research on high-voltage cathode materials, such as LiNi0.5Mn1.5O4 (LNMO), their commercialization is hindered by problems associated with the decomposition of common carbonate solvent–based electrolytes at elevated voltages. To address these problems, we prepared high-voltage LNMO composite electrodes using five polymer binders (two sulfated and two nonsulfated alginate binders and a poly(vinylidene fluoride) conventional binder) and compared their electrochemical performances at ∼5 V vs Li/Li+. The effects of binder type on electrode performance were probed by analyzing cycled electrodes using soft/hard X-ray photoelectron spectroscopy and scanning transmission electron microscopy. The best-performing sulfated binder, sulfated alginate, uniformly covers the surface of LNMO and increased its affinity for the electrolyte. The electrolyte decomposition products generated in the initial charge–discharge cycle on the alginate-covered electrode participated in the formation of a protective passivation layer that suppressed further decomposition during subsequent cycles, resulting in enhanced cycling and rate performances. The results of this study provide a basis for the cost-effective and technically undemanding fabrication of high-energy-density LIBs.

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“…As a material, sodium alginate is a versatile, economical, and high-modulus polysaccharide extracted from brown algae. Recently it has attracted a lot of interest as an eco-friendly binder for both anodic and cathodic electrodes in the lithium ion (Li-ion) battery industry [ 20 , 21 , 22 , 23 ]. The properties of alginate have been discussed in the literature in relation to using alginate as a printable carbon energy feedstock for MFCs [ 24 ].…”

Section: Discussionmentioning

confidence: 99%

Developing 3D-Printable Cathode Electrode for Monolithically Printed Microbial Fuel Cells (MFCs)

2020

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Microbial Fuel Cells (MFCs) employ microbial electroactive species to convert chemical energy stored in organic matter, into electricity. The properties of MFCs have made the technology attractive for bioenergy production. However, a challenge to the mass production of MFCs is the time-consuming assembly process, which could perhaps be overcome using additive manufacturing (AM) processes. AM or 3D-printing has played an increasingly important role in advancing MFC technology, by substituting essential structural components with 3D-printed parts. This was precisely the line of work in the EVOBLISS project, which investigated materials that can be extruded from the EVOBOT platform for a monolithically printed MFC. The development of such inexpensive, eco-friendly, printable electrode material is described below. The electrode in examination (PTFE_FREE_AC), is a cathode made of alginate and activated carbon, and was tested against an off-the-shelf sintered carbon (AC_BLOCK) and a widely used activated carbon electrode (PTFE_AC). The results showed that the MFCs using PTFE_FREE_AC cathodes performed better compared to the PTFE_AC or AC_BLOCK, producing maximum power levels of 286 μW, 98 μW and 85 μW, respectively. In conclusion, this experiment demonstrated the development of an air-dried, extrudable (3D-printed) electrode material successfully incorporated in an MFC system and acting as a cathode electrode.

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New Formulations of High-Voltage Cathodes for Li-Ion Batteries with Water-Processable Binders

Cited by 5 publications

References 15 publications

Sodium Alginate: A Water-Processable Binder in High-Voltage Cathode Formulations

Sodium Alginate: A Water-Processable Binder in High-Voltage Cathode Formulations

Sulfated Alginate as an Effective Polymer Binder for High-Voltage LiNi_0.5Mn_1.5O₄ Electrodes in Lithium-Ion Batteries

Developing 3D-Printable Cathode Electrode for Monolithically Printed Microbial Fuel Cells (MFCs)

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New Formulations of High-Voltage Cathodes for Li-Ion Batteries with Water-Processable Binders

Cited by 5 publications

References 15 publications

Sodium Alginate: A Water-Processable Binder in High-Voltage Cathode Formulations

Sodium Alginate: A Water-Processable Binder in High-Voltage Cathode Formulations

Sulfated Alginate as an Effective Polymer Binder for High-Voltage LiNi0.5Mn1.5O4 Electrodes in Lithium-Ion Batteries

Developing 3D-Printable Cathode Electrode for Monolithically Printed Microbial Fuel Cells (MFCs)

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Sulfated Alginate as an Effective Polymer Binder for High-Voltage LiNi_0.5Mn_1.5O₄ Electrodes in Lithium-Ion Batteries