Conjugated Polymer Energy Level Shifts in Lithium-Ion Battery Electrolytes

Song, Charles Kiseok; Eckstein, Brian J.; Tam, Teck Lip Dexter; Trahey, Lynn; Marks, Tobin J.

doi:10.1021/am505416m

Cited by 40 publications

(42 citation statements)

References 57 publications

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“…In the solid state, the absorption onset for polymer p(gNDI-gT2) is at 1,550 nm ( Supplementary Fig. 1 ) and for p(gNDI-T2) at 817 nm which is consistent with an increased donor strength of the glycol-bithiophene unit compared to bithiophene unit and in agreement with literature 22 23 . The initial UV-Vis spectrum of p(gNDI-gT2) has two absorption peaks, a π - π * transition located between 350 and 550 nm and a broad absorption band from an intramolecular charge transfer complex (ICT) between 600 and 1,550 nm.…”

Section: Resultssupporting

confidence: 89%

N-type organic electrochemical transistors with stability in water

et al. 2016

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Organic electrochemical transistors (OECTs) are receiving significant attention due to their ability to efficiently transduce biological signals. A major limitation of this technology is that only p-type materials have been reported, which precludes the development of complementary circuits, and limits sensor technologies. Here, we report the first ever n-type OECT, with relatively balanced ambipolar charge transport characteristics based on a polymer that supports both hole and electron transport along its backbone when doped through an aqueous electrolyte and in the presence of oxygen. This new semiconducting polymer is designed specifically to facilitate ion transport and promote electrochemical doping. Stability measurements in water show no degradation when tested for 2 h under continuous cycling. This demonstration opens the possibility to develop complementary circuits based on OECTs and to improve the sophistication of bioelectronic devices.

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Section: Resultssupporting

confidence: 89%

N-type organic electrochemical transistors with stability in water

et al. 2016

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“…Conducting polymers, such as conjugated polymers, have been the subject of recent interest due to the high conductivity and the designability of the electronic property, making them broad applications as conductive binders, surface functional materials and electrode materials in rechargeable batteries . Recent studies revealed that promising energy storage performance can be achieved for conducting polymers as LIB electrodes.…”

Section: Introductionmentioning

confidence: 99%

Toward High Performance Thiophene‐Containing Conjugated Microporous Polymer Anodes for Lithium‐Ion Batteries through Structure Design

Zhang

Pan

et al. 2017

Adv Funct Materials

183

146

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Poly(thiophene) as a kind of n-doped conjugated polymer with reversible redox behavior can be employed as anode material for lithium-ion batteries (LIBs). However, the low redox activity and poor rate performance for the poly(thiophene)-based anodes limit its further development. Herein, a structure-design strategy is reported for thiophene-containing conjugated microporous polymers (CMPs) with extraordinary electrochemical performance as anode materials in LIBs. The comparative study on the electrochemical performance of the structure-designed thiophene-containing CMPs reveals that high redox-active thiophene content, highly crosslinked porous structure, and improved surface area play significant roles for enhancing electrochemical performances of the resulting CMPs. The all-thiophenebased polymer of poly(3,3′-bithiophene) with crosslinked structure and a high surface area of 696 m 2 g −1 exhibits a discharge capacity of as high as 1215 mAh g −1 at 45 mA g −1 , excellent rate capability, and outstanding cycling stability with a capacity retention of 663 mAh g −1 at 500 mA g −1 after 1000 cycles. The structure-performance relationships revealed in this work offer a fundamental understanding in the rational design of CMPs anode materials for high performance LIBs.

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“…In addition, this structural alteration causes an increase in the IE of p(g 4 2T‐T) as compared to P3HT. Similar polymers with various oligo ethylene glycol side chains were recently used as the anode material in lithium‐ion batteries and as the active layer in electrochemical transistors . Polar side chains enable the use of more polar solvents such as acetonitrile and dimethylformamide (DMF), which offer better solubility for polar molecular dopants such as F4TCNQ.…”

mentioning

confidence: 99%

“…The g 4 2T‐T monomer was synthesized according to a modified procedure reported by Song et al (see Figure and the Supporting Information for experimental details). Stille polycondensation yielded p(g 4 2T‐T) with a number‐average molecular weight M n ≈ 16 kg mol −1 (Figure S1, Supporting Information) and an optical bandgap of 1.68 eV (Figure S2, Supporting Information).…”

mentioning

confidence: 99%

Polar Side Chains Enhance Processability, Electrical Conductivity, and Thermal Stability of a Molecularly p‐Doped Polythiophene

et al. 2017

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Molecular doping of organic semiconductors is critical for optimizing a range of optoelectronic devices such as field‐effect transistors, solar cells, and thermoelectric generators. However, many dopant:polymer pairs suffer from poor solubility in common organic solvents, which leads to a suboptimal solid‐state nanostructure and hence low electrical conductivity. A further drawback is the poor thermal stability through sublimation of the dopant. The use of oligo ethylene glycol side chains is demonstrated to significantly improve the processability of the conjugated polymer p(g42T‐T)—a polythiophene—in polar aprotic solvents, which facilitates coprocessing of dopant:polymer pairs from the same solution at room temperature. The use of common molecular dopants such as 2,3,5,6‐tetrafluoro‐7,7,8,8‐tetracyanoquinodimethane (F4TCNQ) and 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ) is explored. Doping of p(g42T‐T) with F4TCNQ results in an electrical conductivity of up to 100 S cm−1. Moreover, the increased compatibility of the polar dopant F4TCNQ with the oligo ethylene glycol functionalized polythiophene results in a high degree of thermal stability at up to 150 °C.

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Conjugated Polymer Energy Level Shifts in Lithium-Ion Battery Electrolytes

Cited by 40 publications

References 57 publications

N-type organic electrochemical transistors with stability in water

N-type organic electrochemical transistors with stability in water

Toward High Performance Thiophene‐Containing Conjugated Microporous Polymer Anodes for Lithium‐Ion Batteries through Structure Design

Polar Side Chains Enhance Processability, Electrical Conductivity, and Thermal Stability of a Molecularly p‐Doped Polythiophene

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