Extremely fast-charging lithium ion battery enabled by dual-gradient structure design
Lei‐Lei Lu, Yuyang Lu, Zhengxin Zhu, Jiaxin Shao, Hong‐Bin Yao, Shaogang Wang, Tianwen Zhang, Yong Ni, Xiuxia Wang, Shu‐Hong Yu
Abstract
Extremely fast-charging lithium-ion batteries are highly desirable to shorten the recharging time for electric vehicles, but it is hampered by the poor rate capability of graphite anodes. Here, we present a previously unreported particle size and electrode porosity dual-gradient structure design in the graphite anode for achieving extremely fast-charging lithium ion battery under strict electrode conditions. We develop a polymer binder–free slurry route to construct this previously unreported type particle size-porosity dual-gradient structure in the practical graphite anode showing the extremely fast-charging capability with 60% of recharge in 10 min. On the basis of dual-gradient graphite anode, we demonstrate extremely fast-charging lithium ion battery realizing 60% recharge in 6 min and high volumetric energy density of 701 Wh liter −1 at the high charging rate of 6 C.