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Questions and Answers
What is the primary function of batteries?
What is the primary function of batteries?
- To recharge other devices
- To store excess energy
- To provide a permanent source of power
- To allow electricity-operated devices to work without being connected to a grid (correct)
What is the characteristic of rechargeable batteries?
What is the characteristic of rechargeable batteries?
- They are more expensive than disposable batteries
- They can only be used once
- They are heavier than disposable batteries
- They can be recharged many times (correct)
What is a benefit of using graphene in batteries?
What is a benefit of using graphene in batteries?
- It decreases the surface area of the battery
- It reduces the sustainability of the battery
- It makes the battery more environmentally friendly (correct)
- It increases the weight of the battery
What is a drawback of using lithium-ion batteries?
What is a drawback of using lithium-ion batteries?
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What is the structure of graphene?
What is the structure of graphene?
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What is a benefit of graphene compared to lithium?
What is a benefit of graphene compared to lithium?
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What is a characteristic of graphene?
What is a characteristic of graphene?
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What is a benefit of using graphene in battery production?
What is a benefit of using graphene in battery production?
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Study Notes
Batteries
- Portable sources of power that allow devices to operate without a grid connection
- Divided into two main types: disposable and rechargeable
Disposable Batteries
- Used once and then disposed of after exhaustion
Rechargeable Batteries
- Can be recharged multiple times
- Examples: lead-acid batteries (used in vehicles), lithium-ion and lithium-ion polymer batteries (used in mobile phones, tablets, PCs, smartwatches, etc.)
- Lightweight, safer, and have longer lives
Limitations of Batteries
- Despite being rechargeable, their lifespan is still too short for current needs
Graphene
- A "wonder material" with countless applications
- A single layer of carbon atoms bound together in a honeycomb lattice pattern
- A powerful electrical and thermal conductor
- Extremely lightweight, chemically inert, and flexible with a large surface area
Environmental Benefits of Graphene
- Eco-friendly and sustainable
- Manufacturing process is environmentally-friendly, with low water and energy usage
- Doesn't involve hazardous chemicals
Comparison to Lithium
- Lithium extraction and processing have a high environmental impact
- Requires large quantities of water, which could be used for agriculture and human consumption
- Contains cobalt, a metal that is highly polluting and difficult to dispose of
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