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Energy sourced from fossil to be the only main source of energy to full-fill all aspects of needs. But, fossil fuels as energy sources are non-renewable sources so could run out at a certain time. The decreasing of fossil sources production, especially crude oil, encourage the government of Indonesia to generate, develop, and improve the potency of New-and Renewable Energy (NRE) sources. Solar panel is the most reliable NRE sources to reach the projection of NRE utilization increased by 31.2% in 2050. Li-ion batteries are electrical energy storage devices that are most preferred to be used in solar panels. Li-ion battery with cylindrical model made of LiNi0.85Co0.15Al0.05O2 (NCA) and LiNixMnyCo1-x-yO2 (NMC) cathode material shows good electrochemical performance (energy density, specific capacity, cycle, and stability) and toughness. The cathode material synthesis method is important because it determines battery performance. The combination of co-precipitation and solid-state methods is the best choice to produce cathode materials that provide the best performance for Li-ion batteries for solar panels. [ABSTRACT FROM AUTHOR]