Abstract
The doping mechanism of poly (1-pyrenemethyl methacrylate) (PPy) is investigated through electrochemical analytical and spectroscopic method. The performance of PPy as a Si materials binder is studied and compared with that of a commercial available lithium polyacrylate (PAALi) binder. The pyrene moiety consumes lithium ions according to the cyclic voltammogram (CV) measurement, as a doping to the PPy binder. Based on the lithium consumption, PPy based Si/graphite electrode doping is quantified at 1.1 electron/pyrene moiety. The PPy binder based electrodes surface are uniform and crack free during lithiation/delithiation, which is revealed through Scanning electron microscope (SEM) imaging.
Highlights
Silicon exhibits an order of magnitude higher than that of the conventionally used graphite, dramatic volume change accompanied by high level of side reaction during battery operation disrupts the electrode integrity, and hinders the application of Si in commercial batteries.[1]
The solid electrolyte interface (SEI) blocks further electrolyte side reaction and only the lithium ion can pass through the SEI film and lithiate into Si anode
To quantify the amount of lithium ions that is consumed before lithiation into Si, the quantity of electric charge (Q) is integrated from the open circuit voltage (OCV) to 0.8 V as shown in Figure 1b and 1d
Summary
Silicon exhibits an order of magnitude higher than that of the conventionally used graphite, dramatic volume change (ca. 300%) accompanied by high level of side reaction during battery operation disrupts the electrode integrity, and hinders the application of Si in commercial batteries.[1]. To further clarify the conductive mechanism, we integrate the electrochemical response of the polymer in an electrochemical cell to verify the lithium ions doping into pyrene molecular. The galvanostatic lithiation/delithiation properties of the graphite/Si electrode with lithium polyacrylate (PAALi) binder, and poly (1-pyrenemethyl methacrylate) (PPy) binder was performed.
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