battery reli is usefull enough..hehe

mobile phone: im proud of myself because i can give human being entertain such as provide them songs, sms, video call and etc..
battery : reli??

mobile phone: yea, im great ...

battery: doest u think before how u retain ur life? how u survive??

mobile phone: no, i can live without any help!!!!!

battery: u are wrong, without me u even cannot functioning, im the 1 who help u conserve ur life span...

mobile phone: do not cheat me, i do not believe that i need to rely on u...

battery: please reflect on how u make electrical energy by urself?? without me u cannot produce electric at all..

through the conversation try to ask urself:

can u enjoy ur life without entertain??? such as mobile phone,labtop,mp3 and etc????

what thing make those stuff easily to carry?? bring along ur journey???

tadah!!!!! it is battery...

virtually battery are ubiquitous...we can obtain it easily in any where at any times...
by the way try to imaging that if without battery ur life can be so relaxing and convenient??
for me the answer is no,because without battery many thing cannot functioning well...
otherwise we always need to find the place which have the electric circuit to support our stuff...
like this will bring a lots of troublesm because we need to bring tonnes of thing when goin out....
it's wasted times as well as energy...

now a day scientist invent many type of battery which included dry cell, alkaline cell, silver button cell,lithium iodide battery, lead acid accumulator, nickel cadmium cell, vanadium redox battery, photo voltaic cell and also fuel cell. among all of those cell we can assign them into rechargeble and also non-rechargeble cell..

In electronics, a battery or voltaic cell is a combination of many electrochemical Galvanic cells of similar type to store chemical energy and deliver higher voltage than with single cells.The battery cells create a voltage difference between the terminals of each cell and hence to its combination in battery. When an external electrical circuit is connected to the battery, then the battery drives electrons through the circuit and electrical work is done. Actually battery is a device that converts chemical energy to electrical energy. It consists of one or more voltaic cells, each voltaic cell consists of two half connected in series by a conductive eletrolyte contianing anion and cation.

Now let me introduce you all some rechargeble and non-rechargeble cell and some new technology cell. Let us go through the detail of the cell:

Dry Cell

the cell diagram as below:

Zn(anode reductant)/Zn2+/NH4Cl(electrolyte)/MnO2(oxidant)/Mn2O3,Carbon rod(cathode)

The elctrons are transfer from Zn to MnO2

chemical reaction of dry cell

At anode (oxidation occurs)

Zn(s)----->Zn2+ + 2e-

At cathod reduction occurs

2NH4+ + 2e- -----> 2NH3(g) + H2(g)
2MnO2(s) + H2(g) -----> Mn2O3(s) + H2O(l)

At the electrolyte

Zn2+(aq) + 2NH4Cl(s) + Zn(s) -----> Mn2O3(s) + H2O(l) + Zn(NH3)2Cl2(s)

Usually dry cells is used in toys,touch light,remove control and etc..

Dry cells have many advantages it also bring a lots of disadvantages to us..

-The advantages of dry cell is it is mass produced in factories that why it is very cheap and readily avaible.

-Whereas the disavantages are gasses can accumulate and cause the dry cell to explode and its voltage drops steadily when it is used.

-Dry cell is a non-rechargeble battery and has to to be thrown away one it become flat. This create disposal problem as it contain chemical.

-While as the zinc causing turns into zinc ion,holes from in it,this will cause the chemical inside to leak out.

Lead Acid Accumulator

The cell diagram as below

Pb(anode)/PbSO4/H2SO4/PbO2/PbSO4,Pb(cathode)

Chemical reaction of Lead acid accumulator

At anode (pure Pb plate)

Pb(s) + SO4 2- ------>PbSO4(s) + 2e-

At cathode (Pb plate coated with PbO2)

PbO2(s) + H2SO4 + 2e- ----> PbSO4(s) + 2H2O(l)

Overall Reaction

Pb(s) + PbO2(s) + 2H2SO4(aq) -----> 2PbSO4(s) + 2H2O

Lead acid accumulator is used in automobile. It also know as car battery.

The advantages and disadvantages of lead acid accumulator

-The advantages of lead acid accumulator is it is a rechargeble battery because the anode and cathode reaction can converting the cell into an electrolitic cell.

-During discharge means when the battery is used the Pb plate will transfer the electrons to Pb with PbO2,so that Pb plate become PbSO4 while Pb with PbO2 become PbSO4.

-When during recharging Pb plate turned into PbSO4 and PbO2 turned into PbSO4

2PbSO4(s) + 2H2O(l) -----> Pb(s) + PbO2(s) + 2H2SO4(aq)

-However,this recharging can occur only if the lead sulfate adheres to the lead plate.If the lead sulfate has fall down to the sink,the battery cannot be recharge any more.It has to thrown away.

-This battery produces a large current and the voltage prodecu is nearly constant.

-Whereas the disadvantages is lead acid accumulator is big clumsy heavy and not easy to transport.

-It contains lead a toxic metal which can pollute the enviroment.Therefor this battery should be dispose off carefully.

-If lead reaches the soil it will containminate plants.Other consumers who eat this plant can suffer from lead poisoning.

-The battery also contain quite concentrated sulfuric acid.This is a corrosive liquid and it should also not be allow to reach the enviroment.

Vanadium Redox Battery (new technology cell)

This battery was discovered at the university of New South Wales by a lady called Professional Maria Skyllas Kazacos.

The cell diagram as below

C,V2+(anode)/V3+/H2SO4/VO2 +/VO2+,C(cathode)

Chemical reaction of vanadium redox battery

At anode (oxidation accurs)

V2+ -----> V3+ + e-

At cathode (reduction occurs)

VO2 + + 2H+ + e- -----> VO2+ + H2O(l)

Overall reaction

V2+ + VO2 + + 2H+ ------> V3+ + VO2+ + H2O(l)

Vanadium Redox Battery is a relative new battery which is constantly being improved. It has been used in electric Golf Cart and emergenct back-up battery system in Department of Defense in New South Wales.

The advantages and disadvantages of vanadium redox battery

-The advantage is it contains solution of salt of vanadium which is very easily and cheaply available and it can produce very high current and high voltage.

-The anode and cathode reaction can be reverse easily, therefor it is an 100% efficient rechargeble battery.

-Recharging can be done in two ways:

*by exchanging the electrolytes with fresh one

*by cinverting it to electrolytic cell which reverse the flow of electron

-The electrolyte solutions can be recycle many times,so the electrolytes never need replacing and so there is no wastetage of chemical.

-The electrolytes are all vanadium with difference oxidation number and therefor they never get containminated even they are mix up.

-The battery does not get overheated because the solution act as cooler,so it is a very safe battery.

-Vanadium is non toxic and so cannot polluted the enviroment.Beside, it is recycle and used again and again,so there is no need to dispose it off.

-The disadvantage is vanadium redox battery requires large tanks of the vanadium eelectrolytes,therefor it is clumsy,bulky and heavy.

Bettery can distribute into many type and it bring many advantages and disadvantages to human being,so we must use it in proper way and make sure it wont contaiminated our enviroment..