Georg Bieker

International Council on Clean Transportation | ICCT · Berlin Office

The transportation sector in Brazil stands out due to its strong focus on biofuels, with most passenger cars being gasoline-ethanol flex-fuel vehicles (92% of sales in 2020) operating on a high share of sugarcane-based ethanol in the average fuel mix. Still, after agriculture and land use change, the transport sector is the third largest source of...

Reaching Indonesia’s target of net-zero greenhouse gas (GHG) emissions by 2060 or sooner will depend in part on the decarbonization of the transportation sector, which today is responsible for about 15% of the country’s GHG emissions. Indonesia is considering a range of measures, including shifting from gasoline and diesel internal combustion engin...

Following in the footsteps of lithium-sulfur batteries, magnesium-sulfur batteries offer a high theoretical energy content and are composed of cheap and more environmentally-friendly electrode materials. In comparison to lithium-sulfur, however, current magnesium-sulfur batteries suffer from higher overpotentials at the magnesium anode and the sulf...

Magnesium-based chemistries are of high interest to the battery research community because of the high capacity and abundance of the Mg as anode material. Although providing a high anode capacity, the bivalency of the Mg cation is also the bottleneck of Mg-based batteries. The solid-state diffusion of the highly charged, small Mg ²⁺ -ion is accompa...

The economical storage of electric energy at a large scale is one of the main technological challenges of this century. The state-of-the-art lithium ion batteries (LIBs) has several advantages as, e.g., high energy efficiency and safety. However, to improve the energy storage capabilities, the scientific community is intensively exploring various a...

In many Mg-based battery systems, the reversibility of Mg deposition and dissolution is lowered by parasitic formation processes of the electrolyte. Therefore, high Coulombic efficiencies of Mg deposition and dissolution are only achieved after several ‘conditioning’ cycles. As this phenomenon is especially reported for AlCl3-containing solutions,...

Electrochemical energy storage at a large scale poses one of the main technological challenges of this century. The scientific community in academia and industry worldwide intensively is exploring various alternative rechargeable battery concepts beside state‐of‐the‐art lithium ion batteries (LIBs), for example, all‐solid‐state batteries, lithium/s...

In Li/S and Mg/S batteries, the charge and discharge of the sulfur cathode proceeds through a cascade of bivalent Sx2- and radical Sy•- polysulfide intermediates. The presence of Li+ or Mg2+ cations in the electrolyte determines the type of intermediates and the overpotentials of their formation in a different manner. Based on systematic CV and UV/...

Lithium/sulfur batteries are considered as one of the most promising post-lithium-ion battery systems, because the high specific capacity of sulfur drastically outranges the capacities of Li-ion insertion cathodes. However, at the Li metal anode, dendrite formation and a high reactivity towards the electrolyte lead to lifetime and safety concerns.[...

In order to gain a deeper understanding of Li and Mg polysulphides in Li/S and Mg/S batteries, respectively, this work investigates the impact of the two different cations as well as the influence of the electrolyte solvents’ relative dielectric permittivity and Gutmann donor number on the solubility and relative stability of different Li and Mg po...

This comparative work studies the self-enforcing heterogeneity of lithium deposition and dissolution as the cause for dendrite formation on the lithium metal anode in various liquid organic solvent based electrolytes. In addition, the ongoing lithium corrosion, its rate and thus the passivating quality of the SEI are investigated in self-discharge...