Nickel carbonate powder

Catalog Number	ACEP12607704-4
CAS Number	12607-70-4
Structure
Molecular Formula	NiCO3·Ni(OH)2·xH2O

Case Study

Effect of Trace Nickel (NiCO₃) in Electrolyte on the Electrochemistry of Lithium-Ion Battery Cathodes

Banov, Krum, et al. Journal of The Electrochemical Society 170.12 (2023): 120515.

This study explores the impact of Ni²⁺ ions as impurities in the electrolyte on the electrochemical performance of NMC811 electrodes.
The presence of trace Ni ions in the electrolyte has a significant effect on the electrochemical performance of the oxide electrodes tested.
The figure shows the 5th cycle of NMC811||Li cells. The voltage curve of the oxide electrode in the original electrolyte shows the highest actual specific charge during the CCCV charging process, reaching 197 mAh g^-1, with the smallest CV portion. In contrast, the electrode in the contaminated electrolyte shows a lower specific charge and increased polarization. Notably, NiAcc has the smallest negative effect on specific charge (175 mAh g^-1), followed by NiSO₄ (163 mAh g^-1) and NiCO₃ (153 mAh g^-1). These results highlight the negative impact of Ni impurities in the electrolyte on the actual specific charge of NMC-based electrodes.

Interface Reaction Between NiCO₃-Based Electrodes and LATP Solid Electrolyte: Ni²⁺/Ti⁴⁺ Redox-Induced Degradation

Wang, Lifan, et al. Applied Surface Science 619 (2023): 156741.

To further confirm that Ni²⁺ and Ti⁴⁺ can indeed react, we selected Ni(OH)₂, NiCO₃, and NiO as cathode materials matched with LATP for battery assembly. As expected, the initial Ni 2p XPS spectra of Ni(OH)₂, NiCO₃, and NiO powders primarily showed characteristic peaks of Ni²⁺. However, after contact with LATP and cycling 50 times, the valence state of nickel underwent significant changes. A large amount of Ni³⁺ was detected on the LATP surface after cycling, indicating that Ni²⁺ underwent a redox reaction with strong oxidizing ions. Subsequently, we performed XPS analysis on the Ti element on the surface of the LATP particles and found that Ti³⁺ appeared on the LATP solid electrolyte surface. Based on this, we hypothesize that a chemical reaction occurred at the interface between the cathode (Ni(OH)₂, NiCO₃, NiO) and LATP, where Ni²⁺ ions may have migrated to the LATP particle surface, and a detrimental chemical reaction occurred, reducing Ti⁴⁺ to Ti³⁺. This led to the decomposition and cracking of the LATP solid electrolyte, potentially causing the interface collapse.

NiCO₃ Powder for Easy Assembly of 2D Ni-Based Coordination Polymer Nanosheets as Battery-Type Electrodes

Ma, Qinghai, et al. Nanoscale 13.25 (2021): 11112-11119.

Large-scale Ni-based nanocoordination polymers (Ni-nCPs) can be easily constructed through a self-assembly method at room temperature and atmospheric pressure. In this strategy, eco-friendly solvents such as water and ethanol are used, and the synthesis of 2D Ni-nCPs through self-assembly seems to approach the concept of "green chemistry."
Ni-nCPs-x nanosheets were prepared by a self-assembly method at room temperature. Experimentally, a precursor aqueous solution containing Ni²⁺ and MAA⁻ ions was synthesized by treating NiCO₃ powder with MAA in a 1:2 molar ratio in water. Then, an appropriate amount of ethanol was added to the precursor solution. After standing for 48 hours, a green precipitate appeared, indicating that Ni(MAA)₂ coordination polymer was formed by the coordination between MAA⁻ and Ni²⁺. Ethanol plays a key role in the assembly process. In the absence of ethanol, MAA⁻ ions can remain stable in water due to solvation, but the addition of ethanol weakens this solvation effect as it can form hydrogen-bond networks with water molecules, thereby accelerating the self-assembly of Ni²⁺ and MAA⁻ ions.

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