Effect of Combined Conductive Polymer Binder on the Electrochemical Performance of Electrode Materials for Lithium-Ion Batteries

Abstract

The electrodes of lithium-ion batteries (LIBs) are multicomponent systems and their electrochemical properties are influenced by each component, therefore the composition of electrodes should be properly balanced. At the beginning of lithium-ion battery research, most attention was paid to the nature, size, and morphology peculiarities of inorganic active components as the main components which determine the functional properties of electrode materials. Over the past decade, considerable attention has been paid to development of new binders, as the binders have shown great effect on the electrochemical performance of electrodes in LIBs. The study of new conductive binders, in particular water-based binders with enhanced electronic and ionic conductivity, has become a trend in the development of new electrode materials, especially the conversion/alloying-type anodes. This mini-review provides a summary on the progress of current research of the effects of binders on the electrochemical properties of intercalation electrodes, with particular attention to the mechanisms of binder effects. The comparative analysis of effects of three different binders (PEDOT:PSS/CMC, CMC, and PVDF) for a number of oxide-based and phosphate-based positive and negative electrodes for lithium-ion batteries was performed based on literature and our own published research data. It reveals that the combined PEDOT:PSS/CMC binder can be considered as a versatile component of lithium-ion battery electrode materials (for both positive and negative electrodes), effective in the wide range of electrode potentials.

SiOx/C Composite Anode of Lithium-Ion Batteries with Enhanced Performances Using Multicomponent Binders

“…The PAM with rich amide functional groups not only improves the strain resistance of the plate but also increases the affinity between SiO x and other components . The PTFE can form an elastic network in the electrode matrix. − These results not only give alternative practical scheme of the green binders for the SiO x /C anodes but also provide ideas for the further development of high-performance adhesive technology of Si-based LIBs.…”

Conductive Polymer Frameworks in Silicon Anodes for Advanced Lithium-Ion Batteries

“…58 As a result, polymer side chains can enhance the electrical conductivity during charging and decrease the transfer resistance of electronic charges. 59,60 Taking advantage of these properties, a conductive polymer framework can serve as both a conductive additive and a binder in the electrode. Therefore, it allows high loading of an active material for an improved specific energy density.…”

A Review on Application of Poly(3,4-ethylenedioxythiophene) (PEDOT) in Rechargeable Batteries

“…31 This PEDOT : PSS/CMC composite has been used as an effective binder for various battery materials to improve their rate capability. 30 Another important application of the PEDOT coating is in Li-S batteries. 32 The Li-S system offers a high theoretical capacity (1675 mA h • g −1 ) and energy density (2567 Wh • kg −1 ) given by the redox reaction between elemental sulfur and Li, which are much higher than those of transition-metal oxides.…”

“…Additionally, PEDOT : PSS has been explored as a binder to fabricate battery electrodes. 30 PEDOT : PSS not only enhances material conductivity but also forms a protective layer on the grains of active materials, suppressing electrolyte reduction and transition-metal dissolution. Shao et al proposed a water-soluble composite binder consisting of carboxymethyl cellulose (CMC) and PEDOT : PSS.…”

“…31 This PEDOT : PSS/CMC composite has been used as an effective binder for various battery materials to improve their rate capability. 30…”