Hierarchical modulation of NiSe2 nanosheets/nanodendrites by phase engineering on N-doped 3D porous graphene as self-supporting anode for superior lithium ion batteries

Multi-heteroatom-Doped Carbon Matrix and N-Doped Carbon Shell Double Protection Enabled Superb Stability of Nickel Diselenide for Lithium Storage

“…the positions of the redox peaks of the second and third rings for NiSe 2 @NC/rGO show better reversibility than those of the NiSe 2 /C/rGO electrode, indicating a significantly enhanced cycling stability of NiSe 2 @NC/rGO electrode with double protection from multi-heteroatom doped carbon matrix and N-doped carbon shell encapsulation. In Figure b, during the discharging process, there are three reduction peaks at 1.89, 1.70, and 1.37 V, which can be corresponded to the following three chemical reaction processes of Li + into NiSe 2 as reported in previous literature: NiSe 2 + 2 Li + → NiSe + Li 2 Se 3 NiSe + 2 Li + → Ni 3 Se 2 + Li 2 Se Ni 3 Se 2 + 4 Li + → 3 Ni + 2 Li 2 Se During the charging process, the oxidation peaks at 2.00 and 2.25 V could be found and related to the delithiation processes as follows: Li 2 Se + Ni → NiSe + 2 Li + Li 2 Se + NiSe → NiSe 2 + 2 Li + …”

“…the positions of the redox peaks of the second and third rings for NiSe 2 @NC/rGO show better reversibility than those of the NiSe 2 /C/rGO electrode, indicating a significantly enhanced cycling stability of NiSe 2 @NC/rGO electrode with double protection from multi-heteroatom doped carbon matrix and N-doped carbon shell encapsulation. In Figure b, during the discharging process, there are three reduction peaks at 1.89, 1.70, and 1.37 V, which can be corresponded to the following three chemical reaction processes of Li + into NiSe 2 as reported in previous literature: During the charging process, the oxidation peaks at 2.00 and 2.25 V could be found and related to the delithiation processes as follows: Figure c shows the rate capabilities of NiSe 2 /C/rGO and NiSe 2 @NC/rGO electrodes while they were applied for Li + ion storage studies. The NiSe 2 @NC/rGO electrode showed much better discharge capacities throughout the rate capacities tests than those of the NiSe 2 /C/rGO electrode by exhibiting discharge capacities of 798.7, 657.6, 567.9, 489.0, 424.0, 338.9, and 222.3 mAh g –1 at current densities of 0.1, 0.2, 0.5, 1.0, 2.0, 5.0, and 10.0 A g –1 , respectively.…”

Order-disorder transition in amorphous Vanadium-Phosphorus-Lithium cathode of lithium ion battery

“…The global energy harvesting system market accounted for $449.75 million in 2019 and is expected to reach $1,097.77 million by 2027 [5]. Lithium ion batteries are widely used in energy harvesting because of their high specific capacity and cycle stability [6][7][8][9]. However, conventional cathode materials such as LiFePO4 [10] and NCM (Ni, Co, and Mn) -based materials [11] suffer from low specific capacity, lack of natural supplies and high cost.…”

A unique two-phase heterostructure with cubic NiSe2 and orthorhombic NiSe2 for enhanced lithium ion storage and electrocatalysis

“…9 Particularly, NiSe 2 exhibits great promise for lithium-ion storage and electrocatalysis. 10,11 However, NiSe 2 still suffers from inherent low electronic conductivity, leading to unsatisfactory reaction kinetics and electrode polarization. 12 Moreover, the volume expansion/shrinkage of NiSe 2 during lithiation/delithiation processes decreases the structural stability and cycling life.…”