Nowadays, poly(vinylidene fluoride) (PVdF) has been dominantly
utilized as a polymeric binder in commercialized Li-ion batteries.
However, standardized PVdF-based electrode manufacturing seems cost-intensive
and environmentally hazardous, which relies on the usage of toxic N-methyl-2-pyrrolidone (NMP) as a dispersant. In view of
cost control and environmental awareness, switching to a water-processable
green binder, as a substitute for PVdF, has been imperative with realistic
significance. Herein, commercially available white latex (WL), containing
poly(vinyl acetate) as a staple ingredient, was directly used as an
alternative aqueous binder for PVdF in the fabrication of graphite/Li4Ti5O12-based lithium-ion anodes. WL
exhibits robust adhesion of the electrode coating to the current collector;
meanwhile, the restricted electrolyte swelling of the binder is verified
by in situ electrochemical dilatometry. Outperforming PVdF, WL endows
graphite with extensive surface coverage by the binding agent, dramatically
reducing irreversible decomposition of the electrolyte (SEI formation)
on graphite. Consequently, the WL-based graphite anode delivers the
highest initial coulombic efficiency (CE) of 92% and remarkable long
cyclic stability with a high capacity retention of 332.7 mAh/g, compared
to the PVdF- and carboxymethyl cellulose (CMC)-based ones. Moreover,
WL is also compatible with Li4Ti5O12, endowing it with more stable cycling behavior than that of the
counterparts prepared with both PVdF and even CMC. Our described WL
represents an appealing “green” alternative for PVdF
in manufacturing sustainable and ecofriendly energy storage devices.