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P b O 2(s) + HSO 4 − (aq) + 3H + (aq) + 2e − → PbSO 4 (s) + 2H 2 O (l) Pb (s) + HSO 4 − (aq) → PbSO 4(s) + H + (aq) + 2e − H 2 SO 4 → H + + HSO 4 − Anode P b (s) P b O 2 (s) Discharge Cathode H 2 SO 4 (aq) OX#= 0 OX# = +2
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Lead-Acid Battery
http://en.wikipedia.org/wiki/Lead–acid_battery#Applications
What is a Lead-Acid Battery?
an electrical storage device
lead Pb, PbO2 ; Acid H2SO4
rechargeable : reversible chemical reaction
automobile battery (car battery )
Reference:
PbO2(s) + HSO4
−(aq) + 3H+ (aq) + 2e − → PbSO4(s)
+ 2H2O(l)
Pb(s) + HSO4− (aq) → PbSO4(s) + H + (aq) + 2e −
H2SO4 → H+ + HSO4−
Anode
Pb(s) PbO2(s)
Discharge
CathodeH2SO4(aq)
OX#= 0 OX# = +2
energy + 2PbSO4 + 2H2O → Pb + PbO2 + 2H2SO4
Pb + PbO2 + 2H2SO4
→ 2PbSO4 + 2H2O
When the chemical is used up, the battery need to be recharged...
decrease increasereversedbut need energy!
In our life, cellphone, lap--top, or everything we need to recharge it could be an example of this battery.
When we recharge it, there would always be an electoral devise to connect with energy. It’s because the recharging reaction is non-spontaneous and need energy to help it form back to the original chemicals.
surface area
when it has broken in pieces, it can’t be replaced back completely.the PbSO4 can not strongly adhere to the Pb OR PbO2
• automobile starting
• lighting and ignition battery
• security lights
Applications
Don’ts
1. Do not equalize and/or overcharge your batteries.
2. Do not store your batteries in hot places or under direct sun exposure.
3. Do not use solid or liquid additives in your batteries.
4. Do not neglect to water and only use distilled water. Any other water contains minerals that are bad for your battery.
5. Do not neglect to charge regularly.
6. Do not expose directly your batteries to very low temperatures to prevent any risk of cracking.
Do’s
1. Regularly charge your batteries. Let them to get fully charged before disconnecting the charger
2. Use a good electronic desolator that will help to eliminate hard sulfates from the plates.
3. Store cars and batteries in cool places or at least away from direct sun exposure.
4. Water batteries regularly if they are the unsealed type using distilled water.
5. Protect batteries from being directly exposed to extreme cold weather.
reference: http://batterylifesaver.com/2011/08/get-the-most-from-your-lead-acid-battery/
tips
recycling
• successful recycling program
• 97% was recycled in US
• prevent lead emission
