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Tag Archives: Li-ion

APEC: more on: TI’s three-level buck converter battery charger

bq25910

To save space in battery chargers, Texas Instruments has introduced a 6A three-level buck converter, the bq25910, aimed at phones, tablets and electronic point-of-sale devices. Charging single Li-ion or Li-polymer cells, 95.4% efficiency is available at 1.5A from a 5V input, or 93.3% at 3A from 9V. As well as four switching fets, there is an integrated reverse-blocking FET . ...

Li-ion thermal knowledge pooled into one place

Rice Uni Li ion cell possibilities

US researchers have collated the temperature performance of different Li-ion cell technologies with a view to improving batteries. “People have not looked that studiously at temperature constraints. We searched hard to find one paper that talks about all the problems at the same time and what all the individual components experience at extreme temperatures, and we couldn’t find one,” said ...

Zinc sponge anode makes Li-ion alternative rechargeable

The US Navy has created a rechargeable aqueous zinc battery with performance approaching Li-ion cells. While useful in non-rechargeable applications – it is the basis for ‘alkaline cells’ – zinc electrodes tend to grow dendrites (whiskers) when charged, wrecking the cell. Scientists at the US Naval Research Laboratory (NRL) have created nickel-zinc batteries with 3D sponge zinc anode instead of ...

Seaweed provides naturally-hollow carbon

American Chemical Society seaweed eggbox carbon

Porous carbon from seaweed could boost Li-ion batteries and fuel cells, according to researcher Dr Dongjiang Yang. “We wanted to produce carbon-based materials via a really ‘green’ pathway,” he said. “Given the renewability of seaweed, we chose seaweed extract as a precursor and template to synthesise hierarchical porous carbon materials.” While Yang was at Griffith University in Australia, he worked ...

Not quite how lithium ions move in batteries

Institute for Basic Science Li-ion transport 10ps

The theory explaining how lithium ions move in batteries is not quite right, according to the Institute for Basic Science (IBS) in Korea, which has been examining the process in femtosecond detail. The model was, said IBS, that lithium ions (green dots) move surrounded by a shell of ethylene carbonate (EC, blue ovals) molecules, and that these entities (‘solvation shells’ or ...

Electronica: Panasonic updates ‘smallest’ Li-ion battery

Panasonic CG-320A Li ion

To power wearables, Panasonic will be showing a ‘pin’-style Li-ion cell at Electronica, claiming it to be the “smallest cylindrical lithium-ion rechargeable battery.” Called CG-320A, it is 3.65mm in diameter and 20mm long – one-seventeenth the volume of an AAA battery. Foreseen applications are legion, including: smart watches, fitness trackers, virtual reality glasses and digital pens. As output current is ...

Zinc-ion cell lasts 1,000 cycles to 80%

Chemists at the University of Waterloo in Canada are claiming to have developed a long-lasting zinc-ion battery. It is said to use non-flammable non-toxic materials and a pH-neutral water-based salt, consisting of a water-based electrolyte, a pillared vanadium oxide positive electrode and a metallic zinc negative electrode. Inside, positively-charged zinc ions are oxidized from the zinc metal negative electrode, travel ...

Nexeon raises £30m for silicon Li-ion batteries

Another battery test cell

Silicon lithium-ion battery firm Nexeon has completed a £30 million funding round, from existing investors and a new investor, Woodford Investment Management. The Oxfordshire firm will use the new funds to acquire IP and “complementary technology”, said Nexeon, to open a development lab in Asia near key customers, and to begin designing a larger manufacturing facility. “We are delighted at the ...