@article{IlicTsoukaPerovicetal.2020,
  author    = {Ilic, Ivan K. and Tsouka, Alexandra and Perovic, Milena and Hwang, Jinyeon and Heil, Tobias and L{\"o}ffler, Felix and Oschatz, Martin and Antonietti, Markus and Liedel, Clemens},
  title     = {Sustainable cathodes for Lithium-ion energy storage devices based on tannic acid-toward ecofriendly energy storage},
  series = {Advanced sustainable systems},
  volume    = {5},
  journal   = {Advanced sustainable systems},
  number    = {1},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {2366-7486},
  doi       = {10.1002/adsu.202000206},
  pages     = {8},
  year      = {2020},
  abstract  = {The use of organic materials with reversible redox activity holds enormous potential for next-generation Li-ion energy storage devices. Yet, most candidates are not truly sustainable, i.e., not derived from renewable feedstock or made in benign reactions. Here an attempt is reported to resolve this issue by synthesizing an organic cathode material from tannic acid and microporous carbon derived from biomass. All constituents, including the redox-active material and conductive carbon additive, are made from renewable resources. Using a simple, sustainable fabrication method, a hybrid material is formed. The low cost and ecofriendly material shows outstanding performance with a capacity of 108 mAh g(-1) at 0.1 A g(-1) and low capacity fading, retaining approximately 80\% of the maximum capacity after 90 cycles. With approximately 3.4 V versus Li+/Li, the cells also feature one of the highest reversible redox potentials reported for biomolecular cathodes. Finally, the quinone-catecholate redox mechanism responsible for the high capacity of tannic acid is confirmed by electrochemical characterization of a model compound similar to tannic acid but without catecholic groups.},
  language  = {en}
}
@article{IlicSchutjajewZhangetal.2022,
  author    = {Ilic, Ivan and Schutjajew, Konstantin and Zhang, Wuyong and Oschatz, Martin},
  title     = {Changes of porosity of hard carbons during mechanical treatment and the relevance for sodium-ion anodes},
  series = {Carbon : an international journal sponsored by the American Carbon Society},
  volume    = {186},
  journal   = {Carbon : an international journal sponsored by the American Carbon Society},
  publisher = {Elsevier Science},
  address   = {Amsterdam [u.a.]},
  issn      = {0008-6223},
  doi       = {10.1016/j.carbon.2021.09.063},
  pages     = {55 -- 63},
  year      = {2022},
  abstract  = {Lithium-ion batteries have revolutionized battery technology. However, the scarcity of lithium in nature is driving the search for alternatives. For that reason, sodium-ion batteries have attracted increasing attention in recent years. The main obstacle to their development is the anode as, unlike for lithium-ion batteries, graphite cannot be used due to the inability to form stoichiometrically useful intercalation compounds with sodium. A promising candidate for sodium storage is hard carbon a form of nongraphitisable carbon, that can be synthesized from various precursor materials. Processing of hard carbons is often done by using mechanochemical treatments. Although it is generally accepted and often observed that they can influence the porosity of hard carbons, their effect on battery performance not well understood. Here, the changes in porosity occurring during ball milling are elucidated and related to the properties of hard carbons in sodium storage. Analysis by combined gas physisorption and small angle X-ray scattering shows that porosity changes during ball milling with a significant increase of the open porosity, unsuitable for reversible sodium storage, and decrease of the closed porosity, suitable for reversible sodium storage. While pristine hard carbon can store 58.5 mAh g(-1) in the closed pores, upon 5 h of mechanical treatment in a ball mill it can only store 35.5 mAh g(-1). The obtained results are furthermore pointing towards the disputed "intercalation-adsorption" mechanism.},
  language  = {en}
}