New battery cathode material opened the door for higher rate capability(1)?
New battery cathode material opened the door for higher rate capability(1)?
Low internal cell resistance is the key to high rate capability. This characteristic benefits both in fast-charging and high-current discharging. A spinel-based lithium-ion in an 18650 package can, for example, be discharged at currents of 20-30A with marginal heat buildup. One-second load pulses of twice the specified current are permissible. At continuous high load requirements, a heat build-up will occur and a cell temperature cannot exceed 80°C. Beside power tools and medical instruments, the spinel-based lithium-ion is a candidate for hybrid cars. Manufacturing cost will need to be lowered and the service life prolonged before this battery system can be used for automotive propulsion applications.
The spinel battery has some disadvantages, however. One of the largest drawbacks is the lower capacity compared to the cobalt-based system. Spinel provides roughly 1200mAh in an 18650 package, about half that of the cobalt equivalent. In spite of this, spinel provides an energy density that is about 50% higher than that of a nickel-based equivalent.
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