Abstract
An amorphous MnO2 and acetylene black composite (AMOA) was synthesized through a facile redox method. The composite presents a heterogeneous structure of MnO2 nanosheets anchoring on the surface of acetylene black tightly. The AMOA anode shows excellent stability during initial-stage cycles at different current densities for lithium-ion batteries. The discharge capacity can maintain at 968 mAh g−1 and 410 mAh g−1 at 1 and 5 A g−1 after 40 cycles, respectively. The excellent performance can be attributed to amorphous materials, which mitigate volume expansion and promote phase transition. Moreover, the amorphous material can remain amorphous structure after 40 cycles.
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