Cobalt lithium oxide

• CAS: 12190-79-3
• Catalog Number: ACM12190793
• Category: Main Products
• Molecular Weight: 97.87
• Molecular Formula: CoLiO2
• Synonyms: Lithium colbaltite
• Appearance: Blue-black to dark grey solid

Case Study

Surface Modification of Cobalt Lithium Oxide Powder with Li3PO4 Nanoparticles

Jin, Y., et al. Electrochemical and solid-state letters, 2006, 9(6), A273.

A phosphorus-containing surface layer can be formed on the surface of cobalt lithium oxide (LiCoO2) powder by introducing Li3PO4 nanoparticles (NPs) through simple mechanical mixing and heat treatment. The capacity retention of the obtained Li3PO4 NPs-modified LiCoO2 powder is significantly improved, and a reversible 1C-rate capacity of 164 mAh/g can be achieved after 50 cycles at the optimal temperature of 450 °C.
Synthesis procedure of modified LiCoO2 powder
· The synthesis of Li3PO4 powder involved a precipitation reaction process. Lithium hydroxide (LiOH, A.R.) and ammonium phosphate monobasic (NH4H2PO4, A.R.) were combined in a 3:1 molar ratio and dissolved in deionized water to create a 0.1 M aqueous solution. After milling and heating at approximately 80°C for several hours, a white powder was produced.
· Subsequently, 1 wt % of this phosphate powder was mixed with a commercial LiCoO2 powder through ball-grinding for 8-10 hours. The resulting mixture was dried at 70°C overnight and then heat-treated at 250, 450, 650, and 850°C, respectively, to yield four different powders.

Effect of Cobalt Lithium Oxide Nanoparticle Size on High-Rate Performance of Lithium-Ion Batteries

Jo, Minki, et al. Journal of The Electrochemical Society, 2009, 156(6), A430.

Cobalt lithium oxide (LiCoO2) has been widely studied as a cathode material due to its excellent electrochemical properties and easy synthesis of hexagonal α-NaFeO2 structure. This work investigates the dependence of the high-rate performance of LiCoO2 cathodes on the change of nanoparticle size (100 nm, 300 nm, and 1 μm). The results show that LiCoO2 cathode particles with an average particle size of 300 nm and a BET surface area of 5 m2/g exhibit the best rate capability. This cathode only displayed a minor capacity reduction to 136 mAh/g from 150 mAh/g after 32 cycles at a rate of 7 C.
Preparation of LiCoO2 cathode material samples
In order to evaluate the cycle-life performance of each cathode material, a slurry was created by combining the active material, super P carbon black, and a poly(vinylidene fluoride) binder in weight ratios of 90:10:10 or 40:30:30 in N-methyl-2-pyrrolidene. The composite cathode consisted of approximately 19 mg of cathode material. A coin-type half-cell consisted of a test electrode, a lithium-metal counter and reference electrode, a 15 μm thick microporous polyethylene separator, and an electrolyte solution of 1 M LiPF6 in EC/ DMC (1:1 vol %).

Cobalt lithium oxide synthesis

Gummow, R. J., et al. Materials research bulletin 27.3 (1992): 327-337.

A novel cobalt lithium oxide (LiCoO2) compound was prepared by reacting Li2CO3 and CoCO3 at 400°C. Unlike the well-known LiCoO 2 structure, which is synthesized at a higher temperature (900°C) and contains Li + and Co 3+ ions in discrete layers between close-packed oxygen ion planes, the structure of LiCoO2 (400"C) contains about 6% cobalt in the lithium layer. The electrochemical performance of LiCoO 2 (400°C) is significantly different from that of LiCoO2 (900"C). The electrochemical extraction of LixCoO2 (900°C) in room temperature lithium batteries proceeds as a single-phase reaction above 3.9V and x≤0.9, while the electrochemical extraction of LixCoO2 (400°C) proceeds as a two-phase reaction with an open circuit voltage of 3.61V.
Standard high temperature LiCoO2 (called HT-LiCoO2) is prepared by heating a stoichiometric mixture of Li2CO3 and CoCO 3 at 900°C in air for 24 hours. The material is removed from the furnace and reacted at 400°C for another 24 hours with stoichiometric amounts of Li2CO3 and CoCO3. It is dissolved in hexane in a pestle and mortar and then heated to 400°C at a rate of 50°C per hour in air. The temperature is maintained at this value for about a week to form a single-phase product. Lithium is extracted from LT-LiCoO2 by chemical methods to obtain samples with different lithium contents. Chemical extraction is performed by adding 1g of LiCoO2 to 15ml of H2O and 1-5ml of 5N H2SO4. The sample is stirred continuously for one hour to one week, depending on the desired final lithium concentration. The sample is dried at 80°C for 48 hours. The lithium concentration in the delithiated samples is determined by atomic absorption spectroscopy. Powder X-ray diffraction patterns of various LixCoO2 samples (0.3 < x < 1.0) were obtained on a Rigaku automated powder diffractometer with CuKa radiation monochromated from a graphite crystal. The lattice parameters were refined against an in-house silicon standard. The structure determination was performed using time-of-flight (TOF) neutron diffraction data collected on a POLARIS diffractometer at the Spallation Neutron Source (ISIS). The structure was refined by a profile refinement procedure modified to describe the peak shape by convolution of a double decay exponential with a Voigt function. The neutron scattering amplitudes used in the structure refinement were b(Li)=-0.2030 x 10-12cm, b(Co)=0.2530 x 10q2cm, and b(O)=0.5805 x 1012cm.

Structural study of layered lithium cobalt oxide at the atomic level

Li, Jianyuan, et al. Nature nanotechnology 16.5 (2021): 599-605.

Layered lithium cobalt oxide (LiCoO2, LCO) is the most successful commercial cathode material in lithium-ion batteries. However, its significant structural instability at potentials above 4.35 V (vs. Li/Li+) constitutes a major obstacle to its theoretical capacity of 274 mAh g. Although some high-voltage LCO (H-LCO) materials have been discovered and commercialized, the structural origin of their stability remains elusive. Using a three-dimensional continuous rotation electron diffraction method supplemented by high-resolution transmission electron microscopy, we investigate the structural differences at the atomic level between two commercial LCO materials: normal LCO (N-LCO) and H-LCO. These powerful tools reveal that the curvature of the cobalt oxide layer occurring near the surface determines the structural stability of the material at high potentials, and thus the electrochemical performance. Supported by theoretical calculations, this atomic understanding of the structure-performance relationship of layered LCO materials provides a useful guide for the future design of novel cathode materials with excellent structural stability at high voltages.
The slurry used for electrochemical characterization was prepared by mixing and grinding 70 wt% N-LCO or H-LCO as active material and 20 wt% polyvinylidene fluoride as binder in a mortar, then stirred with 10 wt% Super P as conductive additive and soaked in N-methyl-2-pyrrolidone (NMP) solvent for 12 h. Aluminum foil was then coated with the slurry and vacuum dried at 110 °C for 12 h before being cut into cathode electrodes with a diameter of 10 mm. Typically, the loading mass of active material per electrode was about 1 mg. The cathode electrode was then assembled into a CR2032-type button cell in an argon-filled glove box with water and oxygen content below 0.1 ppm, with lithium metal foil, polypropylene film (Celgard 2400) and 1 M LiPF solution containing ethylene carbonate. Dimethyl carbonate (EC), dimethyl carbonate (DMC) and diethyl carbonate (DEC) with a volume ratio of 1:1:1 were used as anode, separator and electrolyte, respectively. Constant-current charge/discharge characteristics were performed on a LAND CT3001B battery test system with a voltage range of 3.0-4.8 V and a current rate of 0.1C (1C = 274 mAh g) and cycled 10 times at room temperature.

Custom Reviews

August 28, 2023

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Useful cathode material
The cathode material of lithium ion battery prepared by cobalt lithium oxide has a good effect.

Custom Q&A

What's the color and shape of cobalt lithium oxide?

Cobalt lithium oxide is a dark blue or blue-gray crystalline solid.

What is the density and specific surface area of cobalt lithium oxide?

The density of cobalt lithium oxide is about 5.01 g/cm3, and the specific surface area is about 0.4m2/g.

What are the melting and boiling points of cobalt lithium oxide?

Cobalt lithium oxide has a melting point of about 2730℃ and a boiling point of about 3500℃.

What is the water solubility of cobalt lithium oxide?

Cobalt lithium oxide is insoluble in water, but soluble in organic solvents, such as ethanol, chloroform and benzene.

What is the main application field of cobalt lithium oxide?

Cobalt lithium oxide has the characteristics of high specific capacity, high voltage platform, good cycle stability and safety, and is mainly used in other electrochemical devices or catalysts.

How to prepare cobalt lithium oxide?

Cobalt lithium oxide can be prepared by many methods, such as solid-state reaction, solution method, sol-gel method, combustion method, hydrothermal method and so on.

What are the advantages of cobalt lithium oxide?

The advantages of cobalt lithium oxide are high specific capacity (about 140 mAh/g), high voltage platform (about 4 V), good cycle stability (up to more than 1000 times) and safety (not prone to thermal runaway or redox reaction).

What is the crystal structure of cobalt lithium oxide?

The crystal structure of cobalt lithium oxide is a layered hexagonal system, in which cobalt atoms and oxygen atoms form parallel CoO2 layers, and lithium atoms are located in octahedral gaps between CoO2 layers.

What are the disadvantages of cobalt lithium oxide?

The disadvantage of cobalt lithium oxide is that it is easily affected by overcharge or overdischarge, which leads to capacity attenuation or structural change, and it is also easily affected by temperature or humidity, which leads to oxidation or hydrolysis.

What type of electrochemical devices or catalysts is cobalt lithium oxide mainly used for synthesis?

Cobalt lithium oxide can be used to prepare supercapacitors, lithium air batteries, lithium sulfur batteries and other devices, which can provide higher power density or longer cycle life.