Pseudo-capacitive and kinetic enhancement of metal oxides and pillared graphite composite for stabilizing battery anodes
Yongguang Luo, Lingling Wang, Qian Li, Jungsue Choi, G. Hwan Park, Zhiyong Zheng, Yang Liu, Hongdan Wang, Hyoyoung Lee
Abstract
Abstract Nanostructured TiO 2 and SnO 2 possess reciprocal energy storage properties, but challenges remain in fully exploiting their complementary merits. Here, this study reports a strategy of chemically suturing metal oxides in a cushioning graphite network (SnO 2 [O]rTiO 2 -PGN) in order to construct an advanced and reliable energy storage material with a unique configuration for energy storage processes. The suggested SnO 2 [O]rTiO 2 -PGN configuration provides sturdy interconnections between phases and chemically wraps the SnO 2 nanoparticles around disordered TiO 2 (SnO 2 [O]rTiO 2 ) into a cushioning plier-linked graphite network (PGN) system with nanometer interlayer distance (~ 1.2 nm). Subsequently, the SnO 2 [O]rTiO 2 -PGN reveals superior lithium-ion storage performance compared to all 16 of the control group samples and commercial graphite anode (keeps around 600 mAh g −1 at 100 mA g −1 after 250 cycles). This work clarifies the enhanced pseudo-capacitive contribution and the major diffusion-controlled energy storage kinetics. The validity of preventing volume expansion is demonstrated through the visualized image evidence of electrode integrity.