AC-E an der Universität Zu Köln | Karteikarten & Zusammenfassungen

Lernmaterialien für AC-E an der Universität zu Köln

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What are possible applications for Li-ion batteries?

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  • hybrid electric vehicles
  • plug-in hybrid electric vehicles
  • electric vehicles
  • stationary storage and utillisation of intermittent renewable enetgies like solar and wind
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Biggest challange of Li-ion batteries

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complicated devices that never reach thermodynamic stability

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How is the cell lifetime of Li-ion batteries?

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it is poor

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Why do Li-ion batteries have poor cell lifetimes?

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poor cell lifetimes are rooted mainly in side reactions occuring at the electrode-electrolyte interface

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What is a good way to improve the batterie performance?

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surface coating is an economic adn feasible technology the improv the batterie performance by virtue of modifying the surface chemisrty or providing protection layers to minimise the direct contact of the active materiel with the electrolyte

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What can the coating material improve?

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ionic or electronic conductivity

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which factors can be changed by coating of Li-ion materials

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  • supressing phase transition
  • increasing structural stability
  • decreasing the disorder of catioons in crystal sites
  • reducing transition metal dissolution
  • acting as HF scavenger to reduce the electrolyte acidity
  • favouring the formation of solid-electrolyte-interface fim on the anode surface
  • electrode resistance
  • side reactions and heat generation during cycling are decreased, which leads to remarkable improvement in cycle life, rate capability, reversible capacity, coulomb efficiency of the first cycle and overcharge tolerance
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Which is the most promising coating technique?

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carbon coating

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What is the advantage of carbon as a coating material?

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it is a good electronic conductor

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What is the power ability determined by in a battery?

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it is critically determined by its internal resistance (R)

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How does the internal restistance influence the power ability?

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  • higher resistance leads to more rapid decline of the cell voltage at elevated current density due to the ohmic drop 
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Why did Li-ion batteries dominate the portable electronic markets?

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because of their much higher energy per unit weight or volume

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Q:

What are possible applications for Li-ion batteries?

A:
  • hybrid electric vehicles
  • plug-in hybrid electric vehicles
  • electric vehicles
  • stationary storage and utillisation of intermittent renewable enetgies like solar and wind
Q:

Biggest challange of Li-ion batteries

A:

complicated devices that never reach thermodynamic stability

Q:

How is the cell lifetime of Li-ion batteries?

A:

it is poor

Q:

Why do Li-ion batteries have poor cell lifetimes?

A:

poor cell lifetimes are rooted mainly in side reactions occuring at the electrode-electrolyte interface

Q:

What is a good way to improve the batterie performance?

A:

surface coating is an economic adn feasible technology the improv the batterie performance by virtue of modifying the surface chemisrty or providing protection layers to minimise the direct contact of the active materiel with the electrolyte

Mehr Karteikarten anzeigen
Q:

What can the coating material improve?

A:

ionic or electronic conductivity

Q:

which factors can be changed by coating of Li-ion materials

A:
  • supressing phase transition
  • increasing structural stability
  • decreasing the disorder of catioons in crystal sites
  • reducing transition metal dissolution
  • acting as HF scavenger to reduce the electrolyte acidity
  • favouring the formation of solid-electrolyte-interface fim on the anode surface
  • electrode resistance
  • side reactions and heat generation during cycling are decreased, which leads to remarkable improvement in cycle life, rate capability, reversible capacity, coulomb efficiency of the first cycle and overcharge tolerance
Q:

Which is the most promising coating technique?

A:

carbon coating

Q:

What is the advantage of carbon as a coating material?

A:

it is a good electronic conductor

Q:

What is the power ability determined by in a battery?

A:

it is critically determined by its internal resistance (R)

Q:

How does the internal restistance influence the power ability?

A:
  • higher resistance leads to more rapid decline of the cell voltage at elevated current density due to the ohmic drop 
Q:

Why did Li-ion batteries dominate the portable electronic markets?

A:

because of their much higher energy per unit weight or volume

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