Aowei Hybrid Capacitors

Hybrid capacitors (LIC) and EDLC supercapacitors differ in their electrode construction and performance characteristics. EDLC uses activated carbon for both anode and cathode, storing energy through electrostatic charge separation. Hybrid capacitors use a pre-doped lithium-ion anode with activated carbon cathode, combining battery-like energy storage with capacitor-like power delivery. Key differences: Energy density - Hybrid capacitors achieve 20-30 Wh/kg vs 5-10 Wh/kg for EDLC, providing 3-5x longer backup time. Voltage - Hybrid capacitors operate at 3.8V vs 2.7V for EDLC, reducing the number of cells needed for a given system voltage. Cycle life - EDLC offers 500,000+ cycles vs 50,000-100,000 for hybrid capacitors. Self-discharge - Hybrid capacitors have lower self-discharge (5-10% per day vs 15-20% for EDLC). Cost - Hybrid capacitors are typically 2-3x more expensive per farad than EDLC. The choice depends on whether your application prioritizes energy density (choose hybrid) or cycle life/cost (choose EDLC).

Choose hybrid capacitors for applications requiring backup times over 60 seconds. Choose EDLC for high-cycle applications with frequent charge/discharge.

Hybrid capacitors excel in applications requiring both significant energy storage and good power density, particularly where battery replacement is impractical. Optimal applications include: Wearable devices where the thin profile and light weight complement compact designs, and daily charging is acceptable. Wireless sensors and IoT devices requiring months of standby with periodic data transmission bursts. Portable medical devices needing reliable backup power with long shelf life. Smart meters and utility devices requiring 10+ year operational life with minimal maintenance. Asset tracking devices operating in wide temperature ranges where batteries perform poorly. Emergency lighting requiring instant-on capability with extended runtime. Solar-powered devices needing energy storage for nighttime operation. Applications requiring rapid charge (minutes) combined with hours of runtime. Hybrid capacitors are less suitable for applications requiring 500,000+ cycles or continuous high-power operation where EDLC would be more appropriate.

If your application needs 1-60 minutes of runtime with periodic charging, hybrid capacitors are likely the optimal choice.

Hybrid capacitors require careful charging to prevent lithium plating and ensure long cycle life. Key charging requirements: Charge voltage must not exceed 3.8V - overvoltage causes lithium metal plating on the anode, permanently damaging the cell. Charge current should be limited to 1C (1A per Farad) maximum

0.5C is recommended for extended cycle life. Use CC-CV charging: constant current until reaching 3.8V, then constant voltage until current tapers to 0.05C. Never trickle charge or maintain at full voltage continuously - this accelerates degradation. Charge temperature range is 0°C to 45°C

charging below 0°C causes lithium plating. Do not discharge below 2.2V - deep discharge can damage the cell. Pre-charging is not required - hybrid capacitors can be charged from 0V. Simple resistor-limited charging is not recommended due to voltage overshoot risk. Use dedicated LIC charger ICs or voltage-limited supplies with accurate regulation (±50mV).

Always use a dedicated charger IC or precision voltage source with current limiting. Contact our FAE team for recommended charging circuits.

Aowei hybrid capacitors are rated for 50,000 to 100,000 charge/discharge cycles depending on operating conditions. This is significantly less than EDLC (500,000+ cycles) but far exceeds lithium batteries (500-2000 cycles). Cycle life is defined as the number of cycles before capacitance degrades below 80% of initial value when operated within specified parameters. Factors affecting cycle life: Depth of discharge - shallow cycles (20-30% DOD) can achieve 100,000+ cycles, while deep cycles (80-100% DOD) yield 20,000-30,000 cycles. Charge voltage - operating at 3.6V instead of 3.8V can double cycle life. Charge current - lower C-rates extend life

0.5C charging achieves better life than 1C. Temperature - operating and charging at 25°C provides optimal life

45°C operation reduces life by approximately 50%. For maximum cycle life, use shallow discharge cycles, 3.6V charge voltage, and 0.5C charge current.

For applications requiring maximum cycle life, limit depth of discharge to 50% and charge voltage to 3.6V.

Hybrid capacitors can replace batteries in specific applications but are not universal replacements. Suitable applications have: Frequent charging opportunities (daily or more), moderate energy requirements (minutes to hours of runtime), need for wide temperature operation, requirement for 10+ year service life without replacement, burst power requirements with standby periods, or safety concerns with lithium batteries. Unsuitable applications include: Long runtime requirements (days between charging), very high continuous power draw, cost-sensitive applications where battery cost is critical, or applications requiring maximum energy density. When evaluating replacement, compare: Energy density (hybrid: 20-30 Wh/kg vs Li-ion: 150-250 Wh/kg), Cycle life (hybrid: 50,000 vs Li-ion: 500-2000), Temperature range (hybrid: -40°C to +65°C vs Li-ion: 0°C to +45°C), Self-discharge (hybrid: 5-10%/day vs Li-ion: 1-2%/month), and Safety (hybrid: non-flammable vs Li-ion: thermal runaway risk). Many applications benefit from hybrid-battery combinations.

Contact our FAE team for a detailed comparison analysis specific to your application requirements.