Nickel Network Derived from a Block Copolymer Template for MnO2 Electrodes as Dimensionally Stabilized Lithium‐Ion Battery Anodes

To improve lithium-ion batteries further, novel concepts for the reproducible preparation of highly structured bicontinuous battery electrodes are required. With this in mind, the main focus of this work is set on the block copolymer template-directed synthesis of metal nanofoams suitable for the rational study and design of the final conductive matrix through the molecular engineering of the starting polymer. As a proof of concept, diverse MnO₂ electrodes using nickel foam as substrates are prepared and morphologically and structurally characterized by means of scanning electron microscopy, Raman spectroscopy and X-ray diffraction. In order to investigate the electrochemical properties of the prepared MnO₂-nickel foam electrodes cyclic voltammetry and galvanostatic cycling experiments including C-rate tests are performed and the obtained results are discussed with respect to the deposition time. Compared to the reference, i.e. bulk MnO₂-nickel foil electrodes, superior electrochemical characteristics, particularly regarding C-rate capability and long-term cycling stability are achieved, which we attribute to a better dimensional stability of the composite electrode.

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