Electrochemical energy storage (EES) devices having both high power density and high energy density are highly desirable. Although metal-ion hybrid capacitors (MIHCs) integrating a battery-type anode and a capacitor-type cathode are wished to realize this target, state-of-the-art MIHCs just showed the compromise performance between high-power supercapacitors (SCs) and high-energy metal-ion batteries. Herein, we propose a new concept of “device-level integration” to realize the integration of SC, MIHC and dual-ion battery (DIB) in one device. By coupling a mixed and pre-potassiated activated carbon (AC)/graphite anode and another mixed AC/graphite cathode in a K⁺-based organic electrolyte, as-built device can exhibit three distinctly different energy storage behaviors including SC, MIHC and DIB by simply tuning the applied voltage window. Consequently, this device is able to achieve the maximum power density at 0–2.8 V and the maximum energy density at 0–5.0 V, and exhibits a good combination of high power density and high energy density at 0–4.0 V. This work may open a new avenue for building advanced EES devices with adjustable power and energy output characteristics.

具有高功率密度和高能量密度的电化学能量存储（EES）设备是非常期望的。尽管希望将电池型阳极和电容器型阴极集成在一起的金属离子混合电容器（MIHC）可以实现此目标，但是最新的MIHC却显示出大功率超级电容器（SC）和高功率超级电容器（SC）之间的折衷性能。高能金属离子电池。在此，我们提出了“设备级集成”的新概念，以实现将SC，MIHC和双离子电池（DIB）集成到一个设备中。通过在K ^+中耦合一个混合的和预辅助的活性炭（AC）/石墨阳极和另一个混合的AC /石墨阴极通过简单地调节施加的电压窗口，基于有机电解质的建成设备可以展现出三种截然不同的能量存储行为，包括SC，MIHC和DIB。因此，该器件能够在0-2.8 V时达到最大功率密度，在0-5.0 V时达到最大能量密度，并且在0-4.0 V时表现出高功率密度和高能量密度的良好结合。为构建具有可调功率和能量输出特性的先进EES设备开辟了一条新途径。