The rational design of a redox-active mixed ion/electron conductor as a multi-functional binder for lithium-ion batteries
02 Mar 2021-Journal of Materials Chemistry (Royal Society of Chemistry (RSC))-Vol. 9, Iss: 8, pp 4751-4757
TL;DR: In this article, a redox-active mixed ion and electron conductor (redoxactive MIEC) is presented as a binder for the lithium titanate anodes of lithium-ion batteries.
Abstract: A redox-active mixed ion and electron conductor (redox-active MIEC) is presented as a binder for the lithium titanate anodes of lithium-ion batteries. The redox-active MIEC binder (symbolized by PT*-GmCn) was designed to be (1) electrically conductive along its conjugated thiophene backbone (PT = polythiophene), (2) redox-active from its succinimide moiety (* = redox-active) and (3) ionically conductive by adopting glyme (G) branches. It was superior to the practically used PVdF binder in terms of lithium ion diffusivity and electrical conductivity (1.4× and 15 000×, respectively). High capacity was guaranteed, particularly at high rates due to its MIEC nature of PT*-GmCn, while an additional capacity was achieved from its redox activity.
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29 Apr 2015
TL;DR: Prelithiation of this anode using stabilized lithium metal powder (SLMP) improves the first cycle Coulombic efficiency of a SiO/NMC full cell from ∼48% to ∼90% and enables good capacity retention of more than 80% after 100 cycles at C/3 in a lithium-ion full cell.
Abstract: Silicon alloys have the highest specific capacity when used as anode material for lithium-ion batteries; however, the drastic volume change inherent in their use causes formidable challenges toward achieving stable cycling performance. Large quantities of binders and conductive additives are typically necessary to maintain good cell performance. In this report, only 2% (by weight) functional conductive polymer binder without any conductive additives was successfully used with a micron-size silicon monoxide (SiO) anode material, demonstrating stable and high gravimetric capacity (>1000 mAh/g) for ∼500 cycles and more than 90% capacity retention. Prelithiation of this anode using stabilized lithium metal powder (SLMP) improves the first cycle Coulombic efficiency of a SiO/NMC full cell from ∼48% to ∼90%. The combination enables good capacity retention of more than 80% after 100 cycles at C/3 in a lithium-ion full cell.
142 citations
Journal Article•
TL;DR: In this work, the naturally occurring binder sodium alginate is functionalized with 3,4-propylenedioxythiophene-2,5-dicarboxylic acid (ProDOT) via a one-step esterification reaction in a cyclohexane/dodecyl benzenesulfonic acid/water microemulsion system, resulting in a multifunctional polymer binder, that is, SA-P proDOT.
Abstract: An environmentally benign, highly conductive,
and mechanically strong binder system can overcome the
dilemma of low conductivity and insufficient mechanical
stability of the electrodes to achieve high performance lithium ion batteries (LIBs) at a low cost and in a sustainable way. In this work, the naturally occurring binder sodium alginate (SA) is functionalized with 3,4-propylenedioxythiophene-2,5-dicarboxylic acid (ProDOT) via a one-step esterification reaction in a cyclohexane/dodecyl benzenesulfonic acid (DBSA)/water
microemulsion system, resulting in a multifunctional polymer
binder, that is, SA-PProDOT. With the synergetic effects of the functional groups (e.g., carboxyl, hydroxyl, and ester groups), the resultant SA-PProDOT polymer not only maintains the outstanding binding capabilities of sodium alginate but also enhances the mechanical integrity and lithium ion diffusion coefficient in the LiFePO4 (LFP) electrode during the operation of the batteries. Because of the conjugated network of the PProDOT and the lithium doping under the battery environment, the SA-PProDOT becomes conductive and matches the conductivity needed for LiFePO4 LIBs. Without the need of conductive additives such as carbon black, the resultant batteries have achieved the theoretical specific capacity of LiFePO4 cathode (ca. 170 mAh/g) at C/10 and ca. 120 mAh/g at 1C for more than 400 cycles.
63 citations
TL;DR: In this paper, a comprehensive evaluation of the pros and cons of the traditional polyvinylidene fluoride (PVDF) binder, the correlation between PVDF and capacity loss, and the research progress of aqueous-based binders is provided.
Abstract: The demand for safer and cost-effective lithium-ion batteries with higher energy density and longer life requires thorough investigation into the structural and electrochemical behavior of cell components. Binders are a key component in an electrochemical cell that function to interconnect the active material and conductive additive and adhere firmly to the current collector. The characteristic changes in binders during device operation can result in desquamation of active materials from the current collector and induce capacity degradation. Here we provide a comprehensive evaluation of the pros and cons of the traditional polyvinylidene fluoride (PVDF) binder, the correlation between PVDF and capacity loss, and the research progress of aqueous-based binders. Although aqueous-based slurry technology has spurred widespread interest across myriad topics, the purpose of this study is to examine whether aqueous binders can facilitate breakthroughs in future battery technology from the commercialization perspective. By critically analyzing the electrochemical performance of commercially viable anodes and cathodes, we address the key advantages as well as disadvantages of aqueous-based binders. Although aqueous binders outperform the low expandable graphite anode and metal oxide cathodes, their efficiency for largely expandable silicon anodes is unsatisfactory. Thus, aggressive effort is required to develop high-performance binders for future battery technology.
37 citations
TL;DR: In this article , the combined effects of thiophene with phthalocyanine (Pc) as isomers (S2 and S3) on the photovoltaic performance of PSCs were studied for the first time.
20 citations
TL;DR: In this paper, the combined effects of thiophene with phthalocyanine (Pc) as isomers (S2 and S3) on the photovoltaic performance of PSCs were studied for the first time.
20 citations
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