Open AccessSnO2 Quantum Dots Interspersed d-Ti3C2Tx MXene Heterostructure with Enhanced Performance for Lithium Ion Battery
Author(s) -
Libo Wang,
Yan He,
Darong Liu,
Lu Liu,
Hao Chen,
Qianku Hu,
Xuqing Liu,
Aiguo Zhou
Publication year - 2020
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/aba705
Subject(s) - materials science , heterojunction , lithium (medication) , anode , electrochemistry , diffusion barrier , electrode , nanotechnology , quantum dot , chemical engineering , diffusion , composite number , ion , stacking , lithium ion battery , battery (electricity) , layer (electronics) , optoelectronics , chemistry , composite material , medicine , physics , organic chemistry , engineering , thermodynamics , endocrinology , power (physics) , quantum mechanics
Ti 3 C 2 T x MXene is an important concern for lithium ion batteries (LIB) because of its two-dimensional (2D) open structure, excellent electrical conductivity, and low Li + diffusion barrier. However, MXene anodes have a lower capacity, which limits their further application in LIBs. This study presents a SnO 2 QDs@delaminated Ti 3 C 2 T x (d-Ti 3 C 2 T x ) heterostructure composite that is produced via in situ growth of SnO 2 QDs on the layer of d-Ti 3 C 2 T x nanosheets and uses a facile ultrasound irradiation method. Results illustrate that SnO 2 QDs are uniformly anchored on the surface of d-Ti 3 C 2 T x layer. The d-Ti 3 C 2 T x nanosheets inhibits the agglomeration of SnO 2 QD nanoparticles and volume expansion during the charging-discharging process. The hierarchical structure can enlarge the interface area of electrode and electrolyte, which accelerating Li-ion and electron diffusion and transition processes. Electrochemical results reveal that compared to pure d-Ti 3 C 2 T x and SnO 2 QDs, SnO 2 QDs@d-Ti 3 C 2 T x nanocomposites greatly improve the reversible capacity. Remarkably, the SnO 2 @d-Ti 3 C 2 T x composite maintains 390 mAh·g −1 with a capacity recovery after 100 cycles at current density of 1000 mA·g −1 . The synergistic effect of SnO 2 QDs on MXene prevents the re-stacking of d-Ti 3 C 2 T x layers and increases the Li + storage; thus, this system exhibits excellent electrochemical properties for LIBs.