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Wong Tsz KanWong Tsz Kan

F.6B (28)F.6B (28)

Introduction of Secondary CellIntroduction of Secondary Cell Secondary cellSecondary cell is electrolytic cells in which the is electrolytic cells in which the

electrochemical reaction that releases energy is electrochemical reaction that releases energy is reversible. They must be charged before use. reversible. They must be charged before use. Commonly used Commonly used

secondary cell chemistries are:secondary cell chemistries are:

Lead-acid batteryLead-acid battery Nickel cadmium (NiCd) Nickel cadmium (NiCd)

Nickel metal hydride (NiMH)Nickel metal hydride (NiMH)

Lithium ion (Li-ion)Lithium ion (Li-ion)

Lithium ion polymer Lithium ion polymer

(Li-ion polymer)(Li-ion polymer)

(NiCd)

(NiMH)

(Li-ion)

(Li-ion polymer)

(Lead-acid battery)

Introduction of Fuel CellIntroduction of Fuel Cell• Fuel cellFuel cell operates like a battery. However, a fuel cell operates like a battery. However, a fuel cell

does not require recharging. does not require recharging.

• It will produce energy in the form of electricity and It will produce energy in the form of electricity and heat. heat.

• Consists of two electrodes sandwiched around an Consists of two electrodes sandwiched around an electrolyte. Oxygen passes over one electrode and electrolyte. Oxygen passes over one electrode and hydrogen over the other, generating electricity, water hydrogen over the other, generating electricity, water and heat. and heat.

Application of Secondary cell(I)Application of Secondary cell(I)Lead-acid battery:Lead-acid battery:• Starter batteries:Starter batteries: ~Car battery ~Car battery ~Supplies electric energy to the starter motor ~Supplies electric energy to the starter motor ~and the ignition system of a vehicle’s engine.~and the ignition system of a vehicle’s engine.• Stand-by (stationary) batteries:Stand-by (stationary) batteries: ~Designed for installations ~Designed for installations requiring highly reliable requiring highly reliable power back-up, power back-up, ~failsafe engine starting ~failsafe engine starting ~and bulk energy storage ~and bulk energy storage

Application of Secondary cell(II)Application of Secondary cell(II)• Nickel cadmium (NiCd):Nickel cadmium (NiCd): ~Portable electronics and toys~Portable electronics and toys ~Specialty NiCd batteries can be ~Specialty NiCd batteries can be use in the area of wireless telephones, use in the area of wireless telephones, emergency lighting, etc.emergency lighting, etc.• Nickel metal hydride (NiMH):Nickel metal hydride (NiMH): (similar to a NiCd battery but has a hydrogen-absorbing alloy for the anode instead of Cd. )(similar to a NiCd battery but has a hydrogen-absorbing alloy for the anode instead of Cd. )

~The Alstom Citadis low floor tram ordered for Nice, France ~The Alstom Citadis low floor tram ordered for Nice, France ~The humanoid prototype robot ASIMO designed by Honda ~The humanoid prototype robot ASIMO designed by Honda ~Electronic devices such as digital cameras, flashlights, etc.~Electronic devices such as digital cameras, flashlights, etc. ~wireless power tools and RC cars. ~wireless power tools and RC cars. ~Hybrid vehicles ~Hybrid vehicles

Application of Secondary cell(III)Application of Secondary cell(III)• Lithium ion (Li-ion):Lithium ion (Li-ion): ~Consumer electronics, especially ~Consumer electronics, especially portable electronics (camera, mp3 portable electronics (camera, mp3 player, torch, mobile phone, etc. )player, torch, mobile phone, etc. )

• Lithium ion polymer (Li-ion polymer):Lithium ion polymer (Li-ion polymer): ~Manufacturing the mobile phone batteries.~Manufacturing the mobile phone batteries. (the battery can be shaped) (the battery can be shaped) ~Radio-controlled aircraft, ~Radio-controlled aircraft, ~Used in PDAs and laptop computers.~Used in PDAs and laptop computers. ~Power the next generation of battery ~Power the next generation of battery electric vehicles. electric vehicles.

Application of Fuel cellApplication of Fuel cell• power sources in remote locations, such as spacecraft, power sources in remote locations, such as spacecraft,

remote weather stations, large parks, rural locations, remote weather stations, large parks, rural locations, and in certain military applications. and in certain military applications.

• micro combined heat and power, which is cogeneration micro combined heat and power, which is cogeneration for family home, office buildings and factories. for family home, office buildings and factories.

• Car batteryCar battery

ReferenceReference

http://en.wikipedia.org/wiki/Fuel_cellhttp://en.wikipedia.org/wiki/Secondary_cell

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