Research output: Contribution to journal › Article › peer-review
Improvement of thin-film Ni-rich ALD cathode for microbatteries. / Vishniakov, Pavel; Nazarov, Denis; Koshtyal, Yury; Rumyantsev, Aleksander; Shengjie, Peng; Nemov, Sergey; Popovich, Anatoly; Maximov, Maxim.
In: Applied Surface Science, Vol. 609, 155265, 30.01.2023.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Improvement of thin-film Ni-rich ALD cathode for microbatteries
AU - Vishniakov, Pavel
AU - Nazarov, Denis
AU - Koshtyal, Yury
AU - Rumyantsev, Aleksander
AU - Shengjie, Peng
AU - Nemov, Sergey
AU - Popovich, Anatoly
AU - Maximov, Maxim
N1 - Publisher Copyright: © 2022 Elsevier B.V.
PY - 2023/1/30
Y1 - 2023/1/30
N2 - Thin-film Li-ion batteries produced by precise thickness control atomic layer deposition (ALD) method are promising, safe, and high-energy density sources for miniature devices. The paper presents a detailed analysis of the multilayer thin film cathode for microbatteries. Structures were obtained by combining several technological parameters to increase capacity, uniformity, and lifetime. The protective function of a nano-sized coating was demonstrated. The influence of coating application on cathode capacity was explained. The studied structure consists of Ni-rich cathode layer modified with an amorphous Li-Ta-O functional layer on a steel substrate with a Cr coating. The cathode and the functional layer were obtained by the ALD multilayer approach followed by heat treatment at 800 °C for a minute. According to XPS and TEM data, the composition of the cathode after annealing was LiNi0.7Co0.3O2 well-defined structure without separation into Ni-rich and Co-rich layers, with texturing of crystallite pillars and with the absence of Fe. The Li-Ta-O films have a slight chemical composition gradient from Li3Ta1.2O4 on the surface to Ta1.7O5 in bulk. The electrochemical characterization showed that combining the functional layer and cathode heat treatment preserves the electrochemical capacity (32 µAh·µm−1·cm−2) and increases Coulomb efficiency.
AB - Thin-film Li-ion batteries produced by precise thickness control atomic layer deposition (ALD) method are promising, safe, and high-energy density sources for miniature devices. The paper presents a detailed analysis of the multilayer thin film cathode for microbatteries. Structures were obtained by combining several technological parameters to increase capacity, uniformity, and lifetime. The protective function of a nano-sized coating was demonstrated. The influence of coating application on cathode capacity was explained. The studied structure consists of Ni-rich cathode layer modified with an amorphous Li-Ta-O functional layer on a steel substrate with a Cr coating. The cathode and the functional layer were obtained by the ALD multilayer approach followed by heat treatment at 800 °C for a minute. According to XPS and TEM data, the composition of the cathode after annealing was LiNi0.7Co0.3O2 well-defined structure without separation into Ni-rich and Co-rich layers, with texturing of crystallite pillars and with the absence of Fe. The Li-Ta-O films have a slight chemical composition gradient from Li3Ta1.2O4 on the surface to Ta1.7O5 in bulk. The electrochemical characterization showed that combining the functional layer and cathode heat treatment preserves the electrochemical capacity (32 µAh·µm−1·cm−2) and increases Coulomb efficiency.
KW - Atomic layer deposition
KW - Electrode/electrolyte interface
KW - Heat treatment
KW - Multilayer structure
KW - Ni-rich cathode
KW - Thin-films
UR - http://www.scopus.com/inward/record.url?scp=85140287734&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2022.155265
DO - 10.1016/j.apsusc.2022.155265
M3 - Article
AN - SCOPUS:85140287734
VL - 609
JO - Applied Surface Science
JF - Applied Surface Science
SN - 0169-4332
M1 - 155265
ER -
ID: 100883491