This podcast reviews patents and academic journals in the area of lithium and post lithium ion battery. It focuses on cell materials and assembly, however, it may also venture in battery pack technolgy.
Tag: Lithium ion battery
Focuses on the state of the art in lithium ion batteries
In this podcast i discuss the following points raised by Eveline from Delft University of Technology (original text):
In my group we do a lot of work with solid state inorganic electrolytes. I would be extremely interested in your view about the scale up and economics of such systems! For example, in your last Podcast you describe how the LPS/Polymer cells are made.
1. How could such processes be implement on a larger scale and for larger batteries?
2. And if two polymer interfaces are needed, what is the benefit compared to a composite polymer electrolyte with inorganic fillers?
3. And then, compared to standard lithium-ion, is it even possible that the technology could ever compete economically?
I receive a lot of interest regarding setting up R&D programs for lithium ion batteries. In this podcast I dissect the defining elements of a successful battery R&D program. If your company is interested in this type of venture or if you are a student entering this field at an early stage, you may find this episode more interesting than my typical podcast. Enjoy!
Currently accepted cathode dogma preaches the root cause of capacity fade in Ni rich NMC is the irreversible phase change of the active material crystalline structure. However, recent findings challenge the status quo. Listen to my podcast to learn more.
The positive electrode of a lithium ion cell is called a cathode and is responsible for the high voltage of the cell. In this podcast I review commercial cathode chemistries such as LCO, LFP, LMO and NCM/NCA.
The Holy Grail of anodes is a lithium metal anode. Taming this temperamental beast has been unsuccessful so far, but it is bound to change. In this podcast I discuss a composite separator membrane which enables plating lithium with 3x the speed and 3x the quantity (capacity) of commercial lithium ion cells.
Fast charge is limited by the reduction (lithiation) potential and nature of the anode. If charged too fast, graphite anodes may be plated with lithium metal because their lithiation potential is too close to the plating potential of lithium. Faster charge can be accomplished with anodes which lithiate at higher potentials (such as NTO). The trade-off is lower cell energy since there will be a smaller voltage difference between anode and cathode. However, there are anode materials which may bypass this energy – fast charge compromise. Listen to my podcast to learn more.
Toshiba commercializes a battery with a high density lithium titanium niobium oxide anode (HDTNO) which boasts an impressive 350Wh/l, 150Wh/kg and > 14,000 cycles with a fast charge of 6 minutes. Learn how in this podcast.
Currently commercial lithium ion batteries typically charge in 1.5 – 2 hours. ‘Fast charge’ is limited to 30 – 45 minutes and with harsh consequences on cycle life and safety. However, there are battery electrode materials which blur the capacitor/battery line. MoS2 has been claimed by professor Dunn (UCLA) to be such a “pseudocapacitor”. This podcast discusses a patent claiming a pseudocapacitor electrode material which can charge in 2.5 minutes for > 10,000x and with a capacity > 120mAh/g.
Growing silicon directly off current collectors (by CVD) offers a rich library of strategies to solve traditional problems associated with silicon anodes. However, it also raises a few new ones. Find out more in my latest podcast.