prolong lithium-ion battery's life

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.