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

Svetlana N Eliseeva,Veniamin V Kondratiev,Elena G Tolstopyatova,Mikhail A Kamenskii

doi:10.3390/en13092163

Svetlana N Eliseeva, Veniamin V Kondratiev + Show 2 more

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https://doi.org/10.3390/en13092163

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Journal: Energies	Publication Date: May 1, 2020
Citations: 20	License type: CC BY 4.0

Affiliation: St Petersburg University

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.

Highlights

It is well known that electrodes of lithium-ion batteries (LIBs) are multicomponent systems, consisting of active material and other components such as conductive additives and binder.we deal with so-called composite micro-heterogeneous electrodes, where active component is in mixture with others
The benefits of using combined conductive PEDOT:PSS/carboxymethyl cellulose (CMC) binder compared to Polyvinylidene fluoride (PVDF) and CMC binders are as follows: (i) more complete utilization of active material and increase of specific capacity due to enhancement of ionic and electronic conductivity of the electrode; (ii) enhancement of the cycling stability of electrodes resulting from lower degradation of electroactive material grains with a polymeric protective layer; and (iii) green water-based material preparation route in substitution for processing of a fluorine-containing polymer in toxic volatile solvent. In this mini-review, we demonstrate the versatility of combined PEDOT:PSS/CMC binder for both cathode and anode materials and discuss the results summarizing the effect of conducting polymer binders on the electrochemical performance of cathode (LiFePO4 (LFP), LiFe0.4 Mn0.6 PO4 (LFMP), and LiMn2 O4 (LMO)) and anode (Li4 Ti5 O12 (LTO)) materials with optimized amount of PEDOT:PSS/CMC binder and provide mechanistic insights on the binder effects observed
That of the electrodes with PVDF binder. This was explained by strong hydrogen bonding of the carboxyl and hydroxyl groups in CMC with the active material and the current collector [71]. This effect is true for all active materials studied with PEDOT:PSS/CMC binder

Summary

Introduction

It is well known that electrodes of lithium-ion batteries (LIBs) are multicomponent systems, consisting of active material and other components such as conductive additives and binder. We deal with so-called composite micro-heterogeneous electrodes, where active component is in mixture with others. The properties of such multicomponent electrode materials are dependent on all components, which influence each other and should be properly balanced. A polymer binder is commonly required to bind active material and conductive additive together and support good contact between particles and with current collector, the proper structure of electrodes, and their mechanical integrity [1,2,3,4].

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