EurekAlert.org reports: When microbatteries are manufatured, the key challenge is to make them
able to store large amounts of energy in a small space. One way to
improve the energy density is to manufacure the batteries based on
three-dimensional microstructured architectures. This may increase the
effective surface inside a battery- even dozens of times. However, the
production of materials fit for these has proven to be very difficult.
Aalto University Researchers testing the material on coin cells. (Mikko Raskinen / Aalto University)
Researches at Aalto University, Helsinki Finland, has develooped a ALD/MLD deposition process for Li-terephthalate, which has been published in Nanoo Letters (below).
- ALD is a great method for making battery materials fit for 3D
microstructured architectures. Our method shows it is possible to even
produce organic electrode materials by using ALD, which increases the
opportunities to manufacture efficient microbatteries, says doctoral
candidate Mikko Nisula from Aalto University. (EurekAlert.org)
Atomic/Molecular Layer Deposition of Lithium Terephthalate Thin Films as High Rate Capability Li-Ion Battery Anodes
Nano Lett., 2016, 16 (2), pp 1276–1281
We demonstrate the fabrication of high-quality electrochemically active
organic lithium electrode thin films by the currently strongly emerging
combined atomic/molecular layer deposition (ALD/MLD) technique using
lithium terephthalate, a recently found anode material for lithium-ion
battery (LIB), as a proof-of-the-concept material. Our deposition
process for Li-terephthalate is shown to well comply with the basic
principles of ALD-type growth including the sequential self-saturated
surface reactions, a necessity when aiming at micro-LIB devices with
three-dimensional architectures. The as-deposited films are found
crystalline across the deposition temperature range of 200–280 °C, which
is a trait highly desired for an electrode material but rather unusual
for hybrid inorganic–organic thin films. Excellent rate capability is
ascertained for the Li-terephthalate films with no conductive additives
required. The electrode performance can be further enhanced by
depositing a thin protective LiPON solid-state electrolyte layer on top
of Li-terephthalate; this yields highly stable structures with capacity
retention of over 97% after 200 charge/discharge cycles at 3.2 C.
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