Advantage and Disadvantage about Li-ion batteries

  The digital devices that dominate modern life and societies are getting significant development. Typically, mobile phones and laptops are pieces of evidence. Even automobile replace its engine by motor. Lithium ion (Li-ion) battery is the best contributor that makes such magical world.
  Li-ion batteries have superior strength compared to other batteries. Firstly, Lithium is considerably light, though it is a metal. Imagine that you bring stone-like iPhone in your pocket. It is disaster. secondly, it has great output of power. In other words, it has high energy density. Energy density means the amount of energy per volume or weight. Because Li-ion batteries have good energy density, the digital devices can be smaller and lighter.           
Thirdly, It is easy to manage. Unlike other batteries, Li-ion have no memory effect. Therefore, there is no need to completely discharge for charging battery. It means that you can recharge Li-ion batteries any-times!


However, it also has some weaknesses.
Li-ion batteries are not wholly safe. There are some probabilities to explode. Several accidents are occurred world-widely. Such fires are why millions of laptop and smartphone batteries have been recalled over the years.  http://news.naver.com/main/read.nhn?mode=LPOD&mid=tvh&oid=057&aid=0000043739 (Li-ion battery explosion video)
And lithium is not abundant in earth. Also lithium are deposited in some nations narrowly. It makes the price expensive.

  Although Li-ions batteries are utmost technology, most people can't use smartphone whole day because of battery's capacity. Scientists try hard to improve and replace it , but not yet. They have much to be desired. Li-ion batteries still have significant room for improvement.