Ch.18 - ElectrochemistryWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Schematic of a Li-ion battery. When the battery is discharging (operating) Li+ ions move out of the anode and migrate through the electrolyte where they enter the spaces between the cobalt oxid

Problem

A diagram shows a large box with five vertical layers. On the far left is the negative current collector, and on the far right is the positive current collector; in the middle is the electrolyte. Between the electrolyte and the negative current collector is the anode, and between the electrolyte and the positive current collector is the cathode. Electrons travel from the negative current collector to the positive current collector, producing 3.7 volts. The graphite anode contains layers of carbon atoms. Li+ can move in and out of the space between the layers. The cathode contains cobalt oxide layers. Li+ can move in and out of the space between the layers.
Schematic of a Li-ion battery. When the battery is discharging (operating) Li+ ions move out of the anode and migrate through the electrolyte where they enter the spaces between the cobalt oxide layers, reducing the cobalt ions. To recharge the battery, electrical energy is used to drive the Li+ back to the anode, oxidizing the cobalt ions in the cathode.

When a Li-ion battery is fully discharged the cathode has an empirical formula of LiCoO2. What is the oxidation number of cobalt in this state?