Up to date, enormous researches have been highlighted on the materials for developing the energy system with advanced properties. Nevertheless, it is difficult to solve the problems that are associated with fundamental electrochemical performance, such as potential limitations. The conventional strategies for increasing electrical performance of energy or power have been basically devoted to the development of materials with high capacity or high conductivity. In view of the equivalent-circuit, it is same as making an extremely integrated parallel-circuit. The analogical parallel-circuit achieved by developing materials inevitably causes voltage limitation, and the energy and power of systems are in competition. Up to now, these limitations are taken for granted, as though the generating analogical parallel-circuit is only a possible way for high performance energy system in the single unit.
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