Unveiling two-dimensional TiS2 as an insertion host for the construction of high energy Li-ion capacitors

Herein, we report, for the first time, the possibility of using TiS2 as an insertion host for the fabrication of high energy and high power Li-ion capacitors with commercial activated carbon (AC). The Li-insertion and PF6- adsorption/desorption properties are determined using Li in TiS2 and AC electrodes, respectively, which is very useful to balance the mass loading between the electrodes to realize maximum energy. Under balanced loading, the AC/TiS2 based LIC delivers a maximum energy density of similar to 49 W h kg(-1). Upon long-term cycling, the AC/TiS2 based LIC experiences a marginal fade in density; specifically similar to 76% of its initial value is retained after 2000 cycles. Prior to this, a nearly 100% crystalline TiS2 insertion host was prepared via chemical vapor transport with high yield.