Rockbox mail archive
Subject: why protect the batteries-why i go for the recorder,and not the fm-recorderFrom: Martin (martindavidsson_at_gmx.de)
Date: 2003-06-04
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The development of Lithium-Ion (Li-Ion) based batteries retained
the beneficial electrochemical properties of metallic lithium without
exhibiting most of the safety drawbacks. However, care must still be
taken to not overcharge a Li-Ion battery. Overcharging results in the
formation of pure lithium metal, which can react and cause overheating,
fire and even explosions in extreme cases. Most Li-Ion batteries
have built in safety mechanisms such as pressure actuated
electrical disconnect to prevent the most drastic consequences, but
careful circuit design must still be done to ensure that the battery is
not overcharged. At the very least, the battery will be damaged and
have a shorter lifetime.
Electrolyte
Li+
e
LixC
Li+
e
Li1-xMn2O4
Li+
Li1-xMn2O4 + xLi+ + xe
Charge
Discharge
LiMn2O4 Positive
Negative
Overall
LixC
Charge
Discharge
C + xLi+ + xe
LixC + Li1-xMn2O4
Charge
Discharge
LiMn2O4 + C
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