What is Li-ion: Definition and 23 Discussions

A lithium-ion battery or Li-ion battery is a type of rechargeable battery. Lithium-ion batteries are commonly used for portable electronics and electric vehicles and are growing in popularity for military and aerospace applications. A prototype Li-ion battery was developed by Akira Yoshino in 1985, based on earlier research by John Goodenough, M. Stanley Whittingham, Rachid Yazami and Koichi Mizushima during the 1970s–1980s, and then a commercial Li-ion battery was developed by a Sony and Asahi Kasei team led by Yoshio Nishi in 1991.In the batteries, lithium ions move from the negative electrode through an electrolyte to the positive electrode during discharge, and back when charging. Li-ion batteries use an intercalated lithium compound as the material at the positive electrode and typically graphite at the negative electrode. The batteries have a high energy density, no memory effect (other than LFP cells) and low self-discharge. They can however be a safety hazard since they contain flammable electrolytes, and if damaged or incorrectly charged can lead to explosions and fires. Samsung was forced to recall Galaxy Note 7 handsets following lithium-ion fires, and there have been several incidents involving batteries on Boeing 787s.
Chemistry, performance, cost and safety characteristics vary across types of lithium-ion batteries. Handheld electronics mostly use lithium polymer batteries (with a polymer gel as electrolyte), a lithium cobalt oxide (LiCoO2) cathode material, and a graphite anode, which together offer a high energy density. Lithium iron phosphate (LiFePO4), lithium manganese oxide (LiMn2O4 spinel, or Li2MnO3-based lithium rich layered materials (LMR-NMC)), and lithium nickel manganese cobalt oxide (LiNiMnCoO2 or NMC) may offer longer lives and may have better rate capability. Such batteries are widely used for electric tools, medical equipment, and other roles. NMC and its derivatives are widely used in electric vehicles.
Research areas for lithium-ion batteries include extending lifetime, increasing energy density, improving safety, reducing cost, and increasing charging speed, among others. Research has been under way in the area of non-flammable electrolytes as a pathway to increased safety based on the flammability and volatility of the organic solvents used in the typical electrolyte. Strategies include aqueous lithium-ion batteries, ceramic solid electrolytes, polymer electrolytes, ionic liquids, and heavily fluorinated systems.

View More On Wikipedia.org
  1. F

    Efficiency of charging new and old Li-ion batteries in electric cars

    An electric car has, say, a 50 kWhr battery. 1. How much electricity, in kWhr, is needed to add 1 kWhr of stored electricity to the battery? 2. After several years, the battery capacity has, say, fallen to 25 kWhr. How much electricity, in kWhr, is now needed to add 1 kWhr of stored...
  2. E

    Could you check this Li-ion charging circuit?

    Can secondary cell can be described in circuit simulator?? With other symbols like capacitor. Also I wonder if there's a program that provide secondary cell(like Li-ion battery). Please help me
  3. Stonestreecty

    I How do I know the lithium content of a lithium-ion battery?

    Power bank is common for our daily life, especially for our smart phone, which always a lithium-ion battery. Taking airplane is easy at our daily life, but there are restrictions on lithium content for air travel, thus air travelers ask the question "How much lithium in a battery am I allowed to...
  4. M

    Can rechargable Li-ion batteries be rebuilt?

    After so many cycles, rechargeable Li-ion batteries powering electric cars go bad. This I know. I am wondering what goes bad? Is it the electrolyte, the electrodes, or both? And in general, could it be possible to take these degraded battery components and fix them? Thanks in Advance! Mike
  5. P

    Quality 24V 50Ah Li-ion Batteries: A Comprehensive Guide

    anyone have good sources for quality lithium (LiFePO) batts in the 24v 50Ah size? i need something of that size in something like a car batt form factor. i did some gooling around, prices vary widely, i can't ascertain if the vendor makes a quality product, and the types of lithium batts are...
  6. chikou24i

    I Discharge voltage of materials for Li-Ion batteries

    What do we mean by a discharge voltage of a material ? and is it good to have a low one or a high one ? Thank you.
  7. R

    Just simple question about a li-ion battery in a non-hybrid car

    i just had curiosity when i saw car magazine about http://www.roadandtrack.com/new-cars/videos/a18350/lithium-batteries-not-just-for-hybrids/ What is the first car model using li-ion battery in their starter motor..? Is it Porche's track-oriented models?
  8. chikou24i

    Pulse current discharge test of a Li-ion

    Could someone please explain to me what is the definition of a pulse current discharge, and what do we mean by pulse current discharge test ?
  9. P

    Charging Lipos @ 5C with Digital Power Supply

    I have a ton of 3.7 volt lipo's at my house, each of which can be charged @ 5C, and since each have a capacity of 270 mAH, than I should easily be able to charge them @ 1amp. I put 8 in parralel with each other so it is a 1s, 8p battery pack. each of the lipos is the same (in tems of specs, ik...
  10. M

    The battery equivalent internal impedance equation

    Homework Statement Hello, long story short: I need to create a model of Li-Ion battery and I'm stuck on calculating the battery equivalent internal impedance. The thing is, I don't know the equation or even how to make one. However, I have a circuit drawing: Homework Equations Values in...
  11. G

    Li-ion Discharge Rates: Answers to DIY Battery Jump Starter Questions

    More of a general question but thought I'd post it here. Motorcycles are notorious for losing battery charge and not starting requiring a jump or rolling start. Was looking to get one of these new Li-ion battery / jump start modules capable of starting a car (and charging a phone or tablet)...
  12. S

    Li-ion battery positive electrode attraction

    I don't understant how the positive electrode can attract both electrons and the positive Li ions as they both flow to it. Also, the way to start the whole process is to let the electrons flow, right? (Close the circuit.) Without it, the ions also don't want to start flowing, although there is...
  13. T

    How Does Current Affect Li-Ion Battery Efficiency?

    Hi, I am trying to figure out how Li-Ion batteries operate in regards to efficiency. I understand they have rated voltage and current etc. and to operate them at these parameters if possible. However, I'm wondering is it simply the current that has effect on their efficiency. By Efficiency I...
  14. Artlav

    Li-ion protection breakdown voltage?

    Li-ion cells come with undervoltage protection circuits - little integrated thingies that open up the circuit when the voltage across the cell drops below 2.7V or so. What sort of a switch is that? I've been thinking, if a cell is inside a large series pack - a dozen of cells for a hobbyist...
  15. S

    Li-Ion Battery Swelling: Causes and Solutions

    Does anyone have any experience of the swelling of lithium-ion battery packs? Attached are photos of one that came into the workshop recently. The first is still in its Macbook and is genuine Apple, although you can see how it has forced its way out and distorted the case. The second...
  16. D

    Minimum amount of power need to charge a li-ion battery

    What is the minimum amount of power needed to charge a small lithium ion battery of 3.4 V and 2100 mAh?
  17. R

    Voltage ratings of Li-Ion batteries

    Dear Experts I bought a lithium-ion battery rated at 3.7v. I charge it with my existing phone charger rated for 3.7v batteries and charging at 4.2V. i like to know why are batteries are rated like this. That is, a 3.7V rated battery is actually charged to 4.1 or 4.2 when its considered...
  18. R

    Measuring SoC/life on Li-ion battery - help please

    Hi all, I've been trying to find some sort of multimeter/voltmeter/etc that will allow me to get an accurate (and independent of the handset) read on state of charge, or remaining life, on a standard cell phone li-ion battery. I've found a few voltmeters and the like, but my understanding...
  19. O

    Charge lipo battery packs with a li-ion charger?

    charge lipo battery packs with a li-ion charger? hello. i am wondering if it is possible to charge lipo battery packs with a li-ion charger. for example what i eventually want to try is to replace the li-ion batteries of my laptop with lipo battery packs. so if i remove the original...
  20. S

    Nanowire Li-ion battery. Is there a sense?

    Recently, there is a new type of battery is developing that has silicon anode which is able to absorb 8 times more Li-ions than graphite anode. http://en.wikipedia.org/wiki/Nanowire_battery" But if I no make mistake the main limitation of Li-ion battery is its cathode, not anode. Usual...
  21. S

    How Does Li-ion Battery Chemistry Work?

    Could somebody give me detailed explanation how Li-ion chemistry works? For example,if Li ions (cathions) just migrate from one host material (such as graphite) to another (such as Cobalt oxide) where are electrons taken from to run in external circuit? In more common type of battery such as...
  22. B

    Li-Ion Constant Current Constant voltage charger

    Hi I need help designing a constant current constand voltage charger for li-ion batteries. Anyone have any help? Whats the best method of constant current. It will be high current over 1 Amps Thanks
  23. R

    Dell recalls 4.1M exploding Li-Ion batteries

    There was a thread here recently about the http://www.theinquirer.net/default.aspx?article=32550 video, I can't find it anymore. More news: http://www.nytimes.com/2006/08/14/technology/14cnd-battery.html?hp&ex=1155614400&en=499692c95b993103&ei=5094&partner=homepage