MXene/Organics Heterostructures Enable Ultrastable and High-Rate Lithium/Sodium Batteries

Abstract

Organic electrode materials have shown potential for rechargeable batteries because they are environmentally friendly, earth-abundant sources, recyclable, high sustainable, designable, flexible, and lightweight. However, low electrical conductivity and dissolution in organic liquid electrolytes hinder their further development. Herein, MXene/organics heterostructures are designed to address the problems of organic electrodes via a scalable and simple electrostatic self-assembly strategy. Under the effect of the electrostatic interaction, organic cathode material, 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA), is tightly attached to MXene nanosheets. Owing to the high electronic conductivity and special two-dimensional (2D) structure of MXene nanosheets, the issues of PTCDA cathode are effectively relieved. When applied in lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs), the MXene@PTCDA heterostructure exhibits significantly enhanced rate capability and cycling performance than bare PTCDA. The heterostructures proposed here can be applied to other (K, Zn, Al, Mg, Ca, etc.) battery systems. In addition to energy storage and conversion, the heterostructures can be also extended to many fields such as catalysis, sensors, electronics, optics, membranes, semiconductors, biomedicines, etc.

Efficient K‐Storage of Fe‐Coupled Organic Molecule Anode in Ether‐Based Electrolytes

“…To further confirm the coordination mode of Fe and NTCDA, FTIR spectra of Fe‐NTCDA and NTCDA were tested (Figure 2b). The spectral peaks of aromatic C=C stretching vibration are from 1400 cm −1 to 1600 cm −1 [32,33] . For the NTCDA sample, there are two distinct characteristic peaks at 1780 cm −1 and 1578 cm −1 , which correspond to the stretching vibrations of C=O and C−O, respectively.…”

Organics‐MXene Composites as Electrode Materials for Energy Storage

“…Jinkui Feng and co-authors designed PTCDA@MXene heterostructure via a scalable and simple electrostatic self-assembly strategy with about only 5 % of PTCDA in the hybrid. [88] The authors thought that 2D Ti 3 C 2 T x MXene nanosheets in the heterostructure could not only improved the electronic conductivity and electrochemical kinetics of the electrode, but also inhibited the dissolution of PTCDA in the organic electrolyte. Used as LIBs and SIBs cathode materials, PTCDA@MXene exhibited better electrochemical performances than that of bare PTCDA.…”

“…Therefore, most of researchers adopted these methods to fabricate organics/MXene composites electcrodes. Jinkui Feng and co‐authors designed PTCDA@MXene heterostructure via a scalable and simple electrostatic self‐assembly strategy with about only 5 % of PTCDA in the hybrid [88] . The authors thought that 2D Ti 3 C 2 T x MXene nanosheets in the heterostructure could not only improved the electronic conductivity and electrochemical kinetics of the electrode, but also inhibited the dissolution of PTCDA in the organic electrolyte.…”

Developing a p-Toluenesulfonic Acid Monohydrate-Assisted Electrodeposition Method To Synthesize an Additive-Free Polypyrrole Cathode for High-Rate Stability and High Gravimetric/Volumetric Capacity Li-Ion Batteries

“…Rechargeable lithium-ion batteries (LIBs) are widely applied in portable electronics and electric vehicle sectors in recent years. , At present, the cathodes of commercial LIBs mainly consist of inorganic materials, like lithium iron phosphate and ternary materials, − which suffer from high cost, environmental pollution, complex synthesis process, and relatively low theoretical capacity. , Compared with the inorganic materials currently used in cathodes, organic materials with higher theoretical capacities, tunable molecular structures, and renewable sources are excellent candidates for cathode’s active components. However, a lot of exploration is required before organic materials are commercialized.…”