Li-ion Definition and 24 Threads

Another thread (now closed) raised the question of whether it is a good idea or not to "whack" a Li-Ion battery that is no longer working. It is not. But the reasons for it being a bad idea are kind of interesting. (1) A modern Li-Ion battery is not a lantern battery of decades past. It has a...

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...

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

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...

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

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...

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.

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?

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 ?

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...

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...

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)...

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...

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...

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...

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...

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

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...

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...

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...

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...

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...

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

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