• aromaticity;
  • carbon-based materials;
  • ion–molecule reactions;
  • lithium;
  • organic electrodes
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Carbon-based materials such as graphite, are the most common anodes used in lithium ion batteries, but the fundamental question of how many Li ions can be inserted onto C6 aromatic rings is now solved. In their Communication on page 5147 ff., T. Sun and co-workers use a model compound to demonstrate that each C6 ring can accept up to six Li ions to create Li6/C6 additive complexes through a reversible electrochemical reaction, which results in Li ion insertion capacities of up to nearly 2000 mA h g−1.