Cobalt ion batteries are considered as a promising battery chemistry for renewable energy storage. However, there are indeed challenges associated with Co ions batteries that demonstrates undesirable side reactions due to hydrogen gas production. This study demonstrates the use of a nanocomposite electrolyte that provides stable performance cycling and high Co²⁺ approximately better conductivity (24 mS cm⁻¹). The desirable properties of the nanocomposite material can be attributed to its mechanical strength, which remains better, nearly 68 MPa, and its ability to form bonds with H₂O. These findings offer potential solutions to address the challenges of Co dendrite, contributing to the advancement of Co ion batteries as a promising battery chemistry. The exceptional cycling stability of the Co-metal anode, even at ultra-high rates, is a significant achievement demonstrated in the study using the nanocomposite electrolyte. The Co-metal anode a 3500 cycles current density at 80 mA cm⁻², which indicates excellent stability and durability. Moreover, the cumulative capacity of 15.6 Ah cm⁻² at a current density of 40 mA cm⁻² highlights the better energy storage capability. This performance is particularly noteworthy for energy storage applications where high capacity and long cycle life are crucial. The H₂O bonding capacity of the component in the nanocomposite electrolyte plays a vital role in reducing surface passivation and hydrogen evolution reactions. By forming strong bonds with H₂O molecules, the polyethyne helps and prevents the unwanted reactions that can deteriorate battery performance and efficiency. This mitigates issues typically associated with excess H₂O and ion presence in aqueous Co ion batteries. Furthermore, the high-rate performance with excellent stability and cycling stability performance (>500 cycles at 8 C) of full Co||MnO₂ batteries fabricated with this electrolyte further validates its effectiveness in practical battery configurations. These results indicate the potential of the nano nanocomposite electrolyte as a valuable and sustainable option and simplifying the development of reliable and performance for the energy storage systems and renewable energy applications.

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