Current collectors in batteries are one of the least obvious battery parts. Yet, when we investigate, we find they play a critical role, although they do not store energy themselves.
Instead, they are pathways that carry electricity in and out of batteries during charging and discharging. Without efficient current collectors, even the best battery chemistry could not do its job properly!
What Would a Collector Look Like If I Saw One?
Current collectors in batteries are thin sheets of highly conductive metal, that attach to the electrodes:
- On the positive side manufacturers usually use aluminum, because it is lightweight, corrosion resistant, and stable at higher operating voltages.
- The negative electrode normally uses copper though, which offers excellent electrical conductivity, and remains stable at lower voltages.
- Together, these metals help move relatively large electrical currents with minimal energy losses.This is why we say they are critical.
Current Collectors Are Not Perfect By Far
Battery researchers are investigating alternative metals to improve collector performance and reduce costs. Stainless steel, nickel, titanium, carbon-based materials, and metal-coated polymers are all under development for specialized applications.
Some experimental collectors are thinner or textured to reduce weight, improve adhesion to electrodes, and increase battery energy density. Others incorporate protective coatings that resist corrosion and extend battery life.
Battery Collectors Are Sensitive Little Creatures
Our experience taught us that current collectors normally require no maintenance by battery users, because they are sealed safely inside battery cases. However, we do know that they can still suffer damage over time.
Excessive heat, overcharging, deep discharging, vibration, manufacturing errors, or moisture entering a damaged battery can cause corrosion, cracking, or poor electrical contact.
They Do Not Perform Well If They Suffer Damage
Such problems increase electrical resistance, reduce efficiency, and may eventually lead to battery failure.
What We Can Do To Protect Battery Current Collectors
We find the best way to protect collectors is to treat them gently. We always try to protect our batteries from extreme temperatures as best we can. Our advice is always to use the correct charger. Then the current collectors in your batteries should hopefully remain trouble-free.
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