TY  - JOUR
U1  - Wissenschaftlicher Artikel
A1  - Obraztsov, Ievgen
A1  - Bakandritsos, Aristides
A1  - Sedajová, Veronika
A1  - Langer, Rostislav
A1  - Jakubec, Petr
A1  - Zoppellaro, Giorgio
A1  - Pykal, Martin
A1  - Presser, Volker
A1  - Otyepka, Michal
A1  - Zboril, Radek
T1  - Graphene Acid for Lithium-Ion Batteries—Carboxylation Boosts Storage Capacity in Graphene
JF  - Advanced energy materials
N2  - Environmentally sustainable, low-cost, flexible, and lightweight energy storage technologies require advancement in materials design in order to obtain more efficient organic metal-ion batteries. Synthetically tailored organic molecules, which react reversibly with lithium, may address the need for cost-effective and eco-friendly anodes used for organic/lithium battery technologies. Among them, carboxylic group-bearing molecules act as high-energy content anodes. Although organic molecules offer rich chemistry, allowing a high content of carboxyl groups to be installed on aromatic rings, they suffer from low conductivity and leakage to the electrolytes, which restricts their actual capacity, the charging/discharging rate, and eventually their application potential. Here, a densely carboxylated but conducting graphene derivative (graphene acid (GA)) is designed to circumvent these critical limitations, enabling effective operation without compromising the mechanical or chemical stability of the electrode. Experiments including operando Raman measurements and theoretical calculations reveal the excellent charge transport, redox activity, and lithium intercalation properties of the GA anode at the single-layer level, outperforming all reported organic anodes, including commercial monolayer graphene and graphene nanoplatelets. The practical capacity and rate capability of 800 mAh g−1 at 0.05 A g−1 and 174 mAh g−1 at 2.0 A g−1 demonstrate the true potential of GA anodes in advanced lithium-ion batteries.
KW  - carboxylation
KW  - graphene acid
KW  - lithium ion batteries
KW  - organic anodes
Y1  - 2022
UN  - https://nbn-resolving.org/urn:nbn:de:bsz:291:415-361
SN  - 1614-6832
SS  - 1614-6832
U6  - https://doi.org/10.1002/aenm.202103010
DO  - https://doi.org/10.1002/aenm.202103010
VL  - 12
IS  - 5
SP  - 2103010
ER  -