An effective Ni(OH)2 optimization strategy via Cu2+ and Ni3+ co-doping for high capacity and long life-span lithium ion batteries

Molybdenum-Doped Nickel Disulfide (NiS2:Mo) Microspheres as an Active Anode Material for High-Performance Durable Lithium-Ion Batteries

“…After the first CV cycle, the observed reduction peaks during the first cycle appeared around 1.86 and 0.742 V were shifted to 1.87 and 0.73 V, and the oxidation peaks at 0.992 and 2.05 V were shifted to 1.01 and 2.04 V, respectively. The shifts in the redox peaks during the later cycles could be ascribed to the improved diffusion kinetics of Li ions . Notably, the redox peaks exhibit identical shape and position during the second and third cycles, which implies the excellent cycling stability of the NiS 2 :Mo electrode …”

“…In the following first anodic scan, an intense peak appeared at 0.992 V and two less intense peaks appeared around 1.35 and 2.05 V ( vs Li + /Li). The peak appeared at 0.992 V is related to the partial dissolution of the SEI film . On the other hand, the peak appeared around 2.05 V is associated with the delithiation of Li + and oxidation of metallic Ni and formation of NiS 2 , and the peak appeared around 1.35 V corresponds to the oxidation of Mo to form MoO 3 .…”

“…One successful approach to tackle these issues of anode materials is the doping TMOs/TMSs with metal ions. Several mono- and multivalent dopant ions, such as Cu 2+ ,Co 2+ , Mo 6+ , Nb 5+ , Cr 3+ , Ti 4+ , etc., were used to dope TMOs/TMSs and tested as anode materials for LIBs. ,− Among the tested dopants, Mo was seen to improve the specific capacity and cycling stability of TMO/TMS electrodes remarkably. , For instance, Chen et al showed that doping of porous WO 2 with Mo stabilizes its structure and improves its electronic conductivity, resulting in its performance enhancement as the electrode material in LIBs. Recently, we have shown that Mo doping in Cu 2 O-based anodes can substantially enhance its specific capacity (up to 1128 mAh g –1 at 0.1 Ag –1 ) and cycling stability in LIBs .…”

Rationally integrated nickel sulfides for lithium storage: S/N co-doped carbon encapsulated NiS/Cu2S with greatly enhanced kinetic property and structural stability

“…50,56 Last, the transition metals may play the role of a catalyst, leading to electrolyte decomposition during the delithiation process, thus providing some additional capacities. 35,62 The NiS@C and pure-NiS, by contrast, only exhibit the capacities of 405.5 and 63.6 mA h g −1 after 1500 cycles at 1 A g −1 with a lower capacity retention of 76.7% and 14.9%, respectively. The above results further demonstrate that the proper recombination of Cu 2 S and the construction of the S/N co-doped carbon coating structure is an effective strategy to improve the lithium storage performance of the NiS.…”

“…Cu 2+ and Ni 3+ co-doped Ni(OH) 2 (Cu-Ni(OH) 2 ) and Pure-Ni(OH) 2 were synthesized through a simple co-precipitation method which can be found in our previous research. 35 For the preparation of N/S co-doped carbon-coated NiS/Cu 2 S (NiS/ Cu 2 S@N/S-C), typically, 0.5 g as-synthesized Cu-Ni(OH) 2 and 0.5 g dopamine hydrochloride (PDA) were firstly dispersed into 0.5 L Tris buffer solution ( pH = 8.5). After stirring for 24 h at 25 °C, the black precipitate product was obtained through filtering the above mixture.…”