How to power your smartphone for a week!. 2 Presentation name What is a battery? A device that stores chemical energy in its active materials and converts.

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Presentation transcript:

How to power your smartphone for a week!

2 Presentation name What is a battery? A device that stores chemical energy in its active materials and converts it, on demand, into electrical energy by means of an electrochemical reaction – Electrochemical reaction is a chemical reaction involving the transfer of electrons Batteries are made up of one or more basic electrochemical units called cells. – Cells are usually connected in series to increase the voltage. Sentech Cathode Anode Electrolyte + - Electron flow Ion flow

3 Presentation name Types of batteries Primary batteries are used once and thrown away, like the alkaline batteries used in portable CD players – Electrochemical reactions are not reversible and active materials cannot be restored to their original state. Secondary (or rechargeable) batteries can be used many times, like the battery in cell phones and laptop computers – The electrochemical reactions are reversible, and the active materials can be restored to their original chemical composition. Sentech

4 Presentation name Widely used rechargeable batteries Lead acid (30-40 Wh/kg, 70-92% eff., 2V) – Over 100 years old, and still the most widely used rechargeable battery in the world. Nickel metal hydride (30-80 Wh/kg, 66% eff., 1.2 V) – A high power battery chemistry similar to nickel cadmium, introduced in the 1980s. It is environmentally friendly, contains no toxic cadmium, and is replacing NiCd in many applications. Lithium ion (160 Wh/kg, 99.9% eff., V) – The newest and fastest growing rechargeable battery technology. – Theoretical capacity: mAh/g Main concerns: large volumes, liquid technology, leakage, and toxicity Market share 51% 31% 8% Sentech, Wikipedia

5 Presentation name Real batteries

6 Presentation name Research batteries at ORNL

7 Presentation name Actual technology and materials Li-Air Li-S New chemistries

8 Presentation name Cell potential © pinkmonkey.com

9 Presentation name © Maxim Integrated Products Cell capacity

10 Presentation name Cell energy Capacity x voltage Cut off voltage is controlling available energy but also limiting access for safe operation Overcharge Overdischarge

11 Presentation name Lithium ion battery principle Li + + e - + MeO 2 LiMeO 2 LiC 6 Li + + e - + C 6 Discharge reaction: CathodeAnode

12 Presentation name D. Howell, Energy Storage Research and Development, Annual Progress Report 2006 FreedomCAR and Fuel Partnership and United States Advanced Battery Consortium, Electrochemical Energy Storage Technical Team Technology Development Roadmap (Southfield, MI: USCAR, 2006). Hybrid electric vehicles (HEV) Plug-in Hybrid electric vehicles (PHEV) Development targets and accomplishments

13 Presentation name Fruit battery – Natural galvanic element

14 Presentation name Have fun and stay safe!