prolong lithium-ion battery's life (二)
The speed by which lithium-ion ages is governed by temperature and state-of-charge. Figure 1 illustrates the capacity loss as a function of these two parameters.
Figure 1: Permanent capacity loss of lithium-ion as a function of temperature and charge level.
High charge levels and elevated temperatures hasten permanent capacity loss. Improvements in
chemistry have increased the storage performance of lithium-ion batteries.The mentioning of
limited service life on lithium-ion has caused concern in the battery industry and I will need to
add some clarifications. Let me explain: If someone asks how long we humans live, we would
soon find out that the longevity varies according to life style and living conditions that exist in
different countries. Similar conditions exist with the batteries, lithium-ion in particular. Since
BatteryUniversity bases its information on the feedback from users as opposed to scientific
information derived from a research lab, longevity results may differ from manufacturer'
specifications. Let's briefly look at the various living conditions of the lithium-ion battery.The
worst condition is keeping a fully charged battery at elevated temperatures, which is the case
with running laptop batteries. If used on main power, the battery inside a laptop will only last for
12-18 months. I must hasten to explain that the pack does not die suddenly but begins with
reduced run-times.
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