Synthesis and Morphological Control of Nickel Hydroxide for Lithium−Nickel Composite Oxide Cathode Materials by an Eddy Circulating Precipitation Method

Abstract

Spherical nickel hydroxide with high density was synthesized via an eddy-circulating precipitation method, in which a Ni(NO 3 ) 2 solution was reacted with a NaOH solution at 65-70°C, and NH 4 NO 3 -NH 3 ‚H 2 O was used as a buffer reagent. The resulting nickel hydroxide particles, with a tap density of 2.20 g/cm 3 and the average particle size of 30.6 µm, are aggregated by the granular crystallites. The morphology of the crystallite can be controlled by changing the anions. The LiNi 0.8 Co 0.2 O 2 that has been prepared using this nickel hydroxide shows excellent electrochemical performance, which delivers an initial discharge capacity of 190.90 mAh/g at a current rate of 25 mA/g between 3.0 V and 4.35 V and exhibits good cycle stability.

Hierarchical Microspheres Based on α-Ni(OH)2 Nanosheets Intercalated with Different Anions: Synthesis, Anion Exchange, and Effect of Intercalated Anions on Electrochemical Capacitance

“…The peak at 3660 cm –1 was assigned to a v O–H stretching band, and confirmed the presence of a hydroxyl group of the brucite structure of α-Ni(OH) 2 phase . The presence of a broad feature in the hydroxyl stretching region (3200–3600 cm –1 ) corresponded to the hydrogen-bonded hydroxyl groups from the metal hydroxide and intercalated water located in the interlamellar space of the turbostratic structure of α-Ni(OH) 2 . The bands at 2900 and 2838 cm –1 were attributed to a C–H stretching vibration of HMT molecules .…”

“…26 The presence of a broad feature in the hydroxyl stretching region (3200À3600 cm À1 ) corresponded to the hydrogen-bonded hydroxyl groups from the metal hydroxide and intercalated water located in the interlamellar space of the turbostratic structure of α-Ni(OH) 2 . 27 The bands at 2900 and The Journal of Physical Chemistry C ARTICLE 2838 cm À1 were attributed to a CÀH stretching vibration of HMT molecules. 28 The broad band around 1640 cm À1 was assigned to the δ(H 2 O) vibration of water molecules existing between Ni-(OH) 2 layers.…”

Fabrication of copper oxide multilayer nanosheets for supercapacitor application

“…The width of these nanosheets is about 20-30 nm. The nanosheet, nanoparticles and nanorod-like morphologies lead to a high specific surface area and porous volume, which provide the structural foundation for the high specific capacitance [19][20][21][22].…”

Fabrication of Cubic p-n Heterojunction-Like NiO/In2O3 Composite Microparticles and Their Enhanced Gas Sensing Characteristics

“…The gas response of the 24.0 h-NiO/In 2 O 3 sensors was significantly higher than the other two sensors, implying that the gas response of In There were several probable reasons which might be responsible for the preferable gas sensing performance of the p-n heterojunction-like NiO/In 2 O 3 . (1) The NiO/In 2 O 3 with higher specific surface area than In 2 O 3 substrate could afford more active sites to react with methanal gas molecules [41]. 2The p-n heterojunction-like NiO/In 2 O 3 structure was favorable for preventing the undesirable aggregation and ensured the stability of the sensors.…”