Group items tagged

new bendable Li-ion battery

several other flexible Li-ion batteries have been developed already, none has achieved a sufficient performance in operation stability to be applied to commercial products

the electrodes for these batteries can only be made of a few materials due to fabrication difficulties, and

don’t have very good performance

one type of ideal cathode material would be a lithium transition metal oxide

researchers developed a fabrication technique that allows them to thermo-treat the electrode material, enabling the use of almost any material as an electrode

depositing the battery materials onto a brittle mica substrate

Then, using sticky tape, the researchers peeled the mica substrate away, layer by layer

After about 10 minutes of peeling, the researchers could remove the entire mica substrate without damaging the thin-film battery.

Next, the flexible battery is transferred onto a flexible polymer sheet and capped with another flexible polymer sheet

tests, the researchers demonstrated that the new flexible Li-ion battery has the highest charging voltage (4.2 V) and charging capacity (106 μAh/cm2) ever achieved for flexible Li-ion batteries

also demonstrated that the battery could be bent with a high curvature angle

after 100 charge-discharge cycles, the battery lost some of its capacity

Depending on the degree of bending deformation, it maintained between 88.2% and 98.4% of its original capacity.

In the future, the researchers plan to improve the battery performance, particularly its energy density, as well as work on mass production through a one-step laser lift-off process instead of using sticky tape