Domanda del libro di testo
Li-ion batteries used in automobiles typically use a LiMn2O4 cathode in place of the LiCoO2 cathode found in most Li-ion batteries. (a) Calculate the mass percent lithium in each electrode material.
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Ch.20 - Electrochemistry
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement177
- Ch.2 - Atoms, Molecules, and Ions231
- Ch.3 - Chemical Reactions and Reaction Stoichiometry216
- Ch.4 - Reactions in Aqueous Solution189
- Ch.5 - Thermochemistry175
- Ch.6 - Electronic Structure of Atoms168
- Ch.7 - Periodic Properties of the Elements150
- Ch.8 - Basic Concepts of Chemical Bonding177
- Ch.9 - Molecular Geometry and Bonding Theories200
- Ch.10 - Gases179
- Ch.11 - Liquids and Intermolecular Forces113
- Ch.12 - Solids and Modern Materials154
- Ch.13 - Properties of Solutions157
- Ch.14 - Chemical Kinetics199
- Ch.15 - Chemical Equilibrium128
- Ch.16 - Acid-Base Equilibria164
- Ch.17 - Additional Aspects of Aqueous Equilibria163
- Ch.18 - Chemistry of the Environment105
- Ch.19 - Chemical Thermodynamics164
- Ch.20 - Electrochemistry171
- Ch.21 - Nuclear Chemistry122
- Ch.22 - Chemistry of the Nonmetals82
- Ch.23 - Transition Metals and Coordination Chemistry79
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry16
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo
Capitolo 20, Problema 80c
Li-ion batteries used in automobiles typically use a LiMn2O4 cathode in place of the LiCoO2 cathode found in most Li-ion batteries. (c) In a battery that uses a LiCoO2 cathode, approximately 50% of the lithium migrates from the cathode to the anode on charging. In a battery that uses a LiMn2O4 cathode, what fraction of the lithium in LiMn2O4 would need to migrate out of the cathode to deliver the same amount of lithium to the graphite anode?
Guida verificata passo dopo passo1
Identify the chemical formula for the cathodes: LiCoO_2 and LiMn_2O_4.
Understand that in LiCoO_2, 50% of the lithium migrates to the anode during charging.
Calculate the amount of lithium in LiMn_2O_4 that would need to migrate to deliver the same amount of lithium as in LiCoO_2.
Recognize that LiMn_2O_4 has a different stoichiometry, with one lithium per formula unit compared to LiCoO_2.
Determine the fraction of lithium migration in LiMn_2O_4 by comparing the stoichiometry and migration percentage of LiCoO_2.
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Lithium Migration in Batteries
In lithium-ion batteries, lithium ions move between the anode and cathode during charging and discharging. This migration is crucial for the battery's operation, as it allows for the storage and release of electrical energy. Understanding the fraction of lithium that migrates is essential for comparing different cathode materials and their efficiency in energy delivery.
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Percorso guidato
01:21
The Electrolytic Cell
Cathode Materials in Li-ion Batteries
Different cathode materials, such as LiCoO2 and LiMn2O4, have distinct electrochemical properties that affect their performance in batteries. LiCoO2 is known for its high energy density, while LiMn2O4 offers better thermal stability and safety. The choice of cathode material influences the amount of lithium that can be effectively utilized during the charging process.
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Percorso guidato
08:12Laboratory Materials 2
Charge Capacity and Fractional Migration
The charge capacity of a battery refers to the total amount of charge it can store, which is directly related to the amount of lithium that migrates from the cathode to the anode. To deliver the same amount of lithium to the anode, it is necessary to calculate the fraction of lithium that must migrate from the cathode, which can vary based on the specific material properties and design of the battery.
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Percorso guidato
02:19Heat Capacity
Pratica correlata
Domanda del libro di testo
(a) Which reaction is spontaneous in the hydrogen fuel cell: hydrogen gas plus oxygen gas makes water, or water makes hydrogen gas plus oxygen gas?
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Domanda del libro di testo
Li-ion batteries used in automobiles typically use a LiMn2O4 cathode in place of the LiCoO2 cathode found in most Li-ion batteries. (b) Which material has a higher percentage of lithium? Does this help to explain why batteries made with LiMn2O4 cathodes deliver less power on discharging?
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