Ti₃C₂ MXene-Encapsulated NiFe-LDH Hybrid Anode for High-Performance Lithium-Ion Batteries and Capacitors

Abstract

Layered doubled hydroxides (LDHs) have aroused much attention in energy storage for their exchangeable anions and tunable interlayer spacing. However, poor electrical conductivity and aggregation of flakes cause huge volume changes and reduce accessible active sites, leading to inferior cycle stability and rate performance. Hence, a NiFe-LDH/Ti3C2 MXene hybrid with uniformly distributed NiFe-LDH nanoflakes decorated on MXene nanosheets through a simple hydrothermal reaction is prepared. Due to the synergism between the Ti3C2 MXene conductive frameworks and NiFe-LDH, NiFe-LDH/ Ti3C2 MXene shows a superior electrochemical property for lithium storage. Its reversible capacity is 898.9 mAh g–1 at 0.1 A g–1, and even at 1 A g–1, it still has 726.1 mAh g–1, without capacity reduction in lithium-ion half-cells. In addition, the corresponding lithium-ion capacitor shows a higher energy density and power density, showing huge application prospect in lithium storage.

Recent Developments in Titanium Carbide (Ti3C2)-Based Layered Double Hydroxide (LDH) Nanocomposites for Energy Storage and Conversion Applications: A Minireview and Perspectives

“…The reversible capability of the heterostructure was 898.9 and 726.1 mAh g –1 at current densities of 0.1 and 1 A g –1 , respectively, without any reduction occurring in capacity of lithium ion half cells. Additionally, the lithium ion capacitor showed larger power and energy density . Similarly, a 3D electrode of porous NiFe LDH/MXene was achieved in other research that showed greater specific capacitance of 720.2 F/g compared to NiFe LDH that showed a capacitance of 465 F/g.…”

“…Additionally, the lithium ion capacitor showed larger power and energy density. 85 Similarly, a 3D electrode of porous NiFe LDH/MXene was achieved in other research that showed greater specific capacitance of 720.2 F/g compared to NiFe LDH that showed a capacitance of 465 F/g. The NiFe LDH/MXene electrode retained capacitance of 86% after 1000 cycles that was 24% for NiFe LDH, demonstrating 77 Among LDHs, with NiCo LDH as the most representative double hydroxide, the electrochemical properties are still not completely efficient.…”

Universal Strategy for Preparing Highly Stable PBA/Ti3C2Tx MXene toward Lithium-Ion Batteries via Chemical Transformation

“…Figure schematically illustrates the synthetic procedure of PBA/2D host via electrostatic assembling and the subsequent in situ transformation. In brief, ultrathin LDH, MXene, and GO nanosheets were, respectively, synthesized on the basis of fast-precipitation, selective etching, and Hummers’ method. ,, Typically, LDH nanosheets are positively charged due to the substitution of M 2+ by M 3+ in hydroxide plates, while MXene (or GO) nanosheets are negatively charged owing to the existence of abundant functional groups. − An electrostatic force enables the self-assembling between positively charged LDH and negatively charged MXene (or GO), forming LDH/2D host hybrids . Upon the addition of potassium ferricyanide, LDH/MX (or GO) was transformed to PBA/MX (or GO).…”

Modification Strategies of Layered Double Hydroxides for Superior Supercapacitors

“…Moreover, the XPS results further identified that the construction of NiCo‐LDH and MXene was a strong covalent bonding instead of a simply physical contact, and this unique structure could significantly enhance the electrochemical performance (Figure 8f,g). Based on this mechanism, our group has developed a serious of LDHs/MXene hybrids and employed in energy storage devices, including NiMn‐LDH/Ti 3 C 2 , [ 101 ] Ni(OH) 2 /d‐Ti 3 C 2 , [ 107 ] Co‐LDH/MXene, [ 108 ] NiFe‐LDH/MXene [ 109 ] and so on.…”