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Capacity Fading of Lithium-Ion Batteries
Capacity fading—the gradual loss of usable energy storage over cycles or time—is a fundamental limitation of lithium-ion batteries, impacting their longevity in applications like electric vehicles (EVs) and grid storage. Understanding the mechanisms behind fading is critical for developing strategies to extend battery life.
Primary Mechanisms of Capacity Fading:
SEI Layer Growth:
The SEI layer on the anode is initially protective but continuously thickens with each cycle due to minor electrolyte decomposition. This consumes lithium ions and reduces available capacity.
High charging voltages (e.g., >4.3V for NMC) or low temperatures (<0°C) accelerate SEI growth.
Cathode Degradation:
Transition metal dissolution (e.g., Co, Mn from NMC) weakens the cathode structure and causes “cathode shuttling,” where dissolved metals deposit on the anode, further damaging the SEI.
Microcracking in cathode particles (due to volume changes during lithium insertion/extraction) reduces electrical connectivity and active material utilization.
Anode Lithium Plating:
At high charge rates or low temperatures, lithium ions may deposit as metallic lithium (dendrites) instead of inserting into the graphite anode. This reduces available lithium and poses safety risks.
Electrolyte Depletion:
Repeated cycling consumes electrolyte, especially in high-power applications. Solvent evaporation at elevated temperatures (e.g., >60°C) further exacerbates this.
Factors Accelerating Capacity Fading:
Temperature: High temperatures (e.g., >55°C) accelerate all degradation mechanisms, while low temperatures increase lithium plating risk.
Depth of Discharge (DOD): Full DOD cycles (0–100% SOC) cause more stress than partial DOD (e.g., 20–80% SOC). EV manufacturers often limit SOC windows to 10–90% to reduce fading.
Charge Rate: Fast charging (>1.5C) increases polarization and SEI growth. For example, a battery charged at 3C may fade 30% faster than one charged at 0.5C.
Single-crystal cathodes and lithium-rich oxides (e.g., LiNi0.8Co0.1Mn0.1O2) improve structural stability.
Thermal Management: Active cooling/heating systems maintain cell temperatures within 25–40°C for optimal longevity.
Case Study:A typical NMC/graphite EV battery cycled at 25°C with 80% DOD may retain ~85% capacity after 1,000 cycles. At 45°C, capacity fades to ~70% under the same conditions, highlighting the critical role of temperature management in extending battery life.
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