LITHIUM-ION BATTERY COST-EFFECTIVENESS | VOGT CTE

Lithium-ion battery systems are considered a central technology for modern energy and mobility solutions. However, their cost-effectiveness is often assessed in a generalized manner – either as a significant financial burden or as an essential investment with high savings potential. In practice, the cost-effectiveness largely depends on the application scenario, design, usage, and lifespan. A battery system is deemed economical when the financial benefits over its entire lifespan exceed the acquisition, operational, and disposal costs.

EXAMPLES OF NON-COMMERCIAL USE

A clearly non-economic application is present when batteries are oversized. Overly large storage systems incur high investment costs, while a large portion of the capacity is seldom utilized. The stored kilowatt-hours thus become unnecessarily expensive.

The use of lithium-ion batteries in applications with very low cycle counts is also uneconomical. If a battery is charged and discharged infrequently, it cannot amortize its high purchase costs before it loses capacity due to aging.

The use in environments with high temperatures or poor ventilation is also problematic. Accelerated aging leads to premature capacity loss and significantly shortens the lifespan, greatly increasing the cost per stored kilowatt-hour.

Another cost factor is the use of cheap or unsuitable components, such as low-quality chargers or basic battery management systems. Short-term savings often lead to higher maintenance and replacement costs.

EXAMPLES OF VERY COST-EFFECTIVE USE

A particularly economical use of lithium-ion batteries can be found in photovoltaic systems with high self-consumption. Here, stored solar power replaces expensive grid electricity, making the storage system economically viable over many charge cycles.

Batteries are also highly economical in load management for businesses and industry. By capping peak loads, grid fees can be significantly reduced, which greatly increases economic benefits.

Another example is the use in multi-layer or multi-cycle operation, where batteries are used daily or even several times a day. The more usable cycles a battery achieves over its lifespan, the lower the costs per kilowatt-hour.

Even second-life batteries can be economical when they are specifically used for applications with lower power requirements. The lower acquisition costs greatly improve the economic viability in this case.

WHAT YOU CAN DO YOURSELF TO USE LITHIUM-ION BATTERIES EFFICIENTLY

The most important lever is a demand-oriented design. A battery system should be precisely tailored to the actual energy needs and usage profile. Every unnecessary kilowatt-hour of capacity costs money.

Equally crucial is a long lifespan. Gentle operation, controlled charge states, and good temperature management reduce aging costs per year.

An intelligent battery management system ensures that the battery is optimally used, protected, and monitored. This prevents failures and maximizes usable cycles.

CHECKLIST: HOW TO USE LITHIUM-ION BATTERIES COST-EFFECTIVELY

☐ Analyze operational profiles and charging cycles realistically
☐ Adjust battery capacity precisely to actual needs
☐ Choose high-quality batteries with strong cycle durability
☐ Ensure a powerful battery management system
☐ Limit charge and discharge capacities sensibly
☐ Ensure effective temperature management and ventilation
☐ Optimize self-consumption or peak loads strategically
☐ Schedule regular monitoring and maintenance
☐ Evaluate lifespan instead of focusing solely on the lowest purchase price

Absolute No-Gos for Economic Usage

Acquire batteries without a clear economic analysis
Install oversized storage “as a reserve”
Use cheap components and inappropriate chargers
Operate batteries at high temperatures continuously
Allow deep discharges and constant full charging
Neglect maintenance and monitoring
Use batteries in applications with very low utilization

Lithium-ion battery systems can be very economical—or lead to costly mistakes. Economic efficiency arises not from the battery alone but from smart planning, appropriate sizing, and durable, well-monitored operation. Those who consider usage, costs, and lifespan together can harness the full economic potential of this technology.

SECOND-LIFE CONCEPTS FOR BATTERY STORAGE SYSTEMS

Second-life concepts for battery storage describe the reuse of lithium-ion batteries after their initial service phase, typically from electric vehicles or industrial applications. Although these batteries may no longer provide full performance for their original purpose, they often still retain seventy to eighty percent of their initial capacity. Rather than recycling them prematurely, they are repurposed for less demanding applications.

The significant advantage of second-life batteries lies in the extended overall lifespan. The energy- and resource-intensive production of a battery is spread over significantly more years of use. This dramatically reduces the ecological footprint per stored kilowatt-hour. At the same time, the demand for new raw materials such as lithium, cobalt, or nickel decreases.

Typical application areas for second-life battery storage include stationary energy storage, particularly in conjunction with photovoltaic systems, in commercial enterprises, or for grid stabilization. Emergency power systems, neighborhood storage, or charging infrastructure with buffer storage also benefit from these concepts, as they involve lower performance requirements and slower charge cycles.

In addition to ecological advantages, second-life systems also offer economic opportunities. The acquisition costs are lower than for new battery systems, making storage solutions economically viable even for applications that might be marginal with new batteries. A careful assessment of the battery condition is essential, including capacity, internal resistance, and safety features.

Challenges predominantly arise from standardization, safety, and warranties. Diverse cell chemistries, designs, and aging conditions necessitate tailored battery management systems and clear quality criteria. Only through structured testing, certifications, and transparent documentation can safe and reliable second-life storage be realized.

In the long term, second-life concepts form an important bridge between initial use and recycling. They meaningfully complement the lifecycle of lithium-ion batteries before the contained raw materials are recovered at the end competently. This significantly contributes to a circular economy, sustainability, and a more efficient use of battery storage.

WHAT IS ALREADY POSSIBLE TODAY WHEN IT COMES TO RECYCLING LITHIUM-ION BATTERIES—AND WHAT ISN'T?

Significant technological advancements have been made in recycling lithium-ion batteries in recent years. Today it is already possible to safely and industrially recover a significant portion of valuable materials from used batteries on a large scale. This primarily includes metals such as cobalt, nickel, copper, and aluminum. These substances can be extracted in high purity using established mechanical, thermal, and chemical processes and reused in industry.

Also, lithium itself can now be recycled, albeit with still limited efficiency. In modern facilities, lithium is usually obtained from slags or process solutions. Technically, this is feasible, but economically it remains challenging as recovery is energy and chemically intensive. Nonetheless, more facilities are being developed specifically designed to improve lithium yield.

Safely discharging, dismantling, and shredding even large battery systems, such as those from electric vehicles or stationary storage, is already possible. Automated processes significantly reduce risks from fires or toxic gases. In Europe, there are now industrial recycling chains that completely cover the entire process from collection points to raw material recovery.

What is not yet comprehensively possible is truly lossless and fully circular recycling. A portion of the materials still goes lost or is only recovered in inferior forms. Particularly organic components, electrolytes, and plastics are mostly energetically recovered or disposed of instead of being reused materially.

Also, the so-called direct recycling, in which active battery materials like cathode powder are processed so that they can be directly reused in new batteries without complete chemical decomposition, is not yet commercially viable. This method would be especially sustainable, but largely remains in the research and pilot stages.

Another limitation lies in the lack of standardization. Different cell formats, cell chemistries, and designs complicate efficient recycling processes. Today, facilities must operate very flexibly, which increases costs and complexity. Uniform battery designs would significantly improve recycling, but have not yet been widely implemented.

In summary, recycling is technically possible today, safe, and increasingly efficient, especially for metals with high economic value. However, a closed material cycle with maximum recovery while maintaining low costs and low energy input has not yet been achieved. Development is clearly heading in this direction, but further technological and structural steps are necessary before a truly complete battery cycle can be realized.

THE IMPACT OF CHARGING AND POWER ELECTRONICS ON THE COST-EFFECTIVENESS OF BATTERIES

The cost-effectiveness of a lithium-ion battery depends not only on its purchase price and nominal capacity but also significantly on how it is charged and discharged. An unsuitable charging technique or poorly designed power electronics can accelerate battery aging considerably. As a result, the usable lifespan decreases, the battery needs to be replaced sooner, and the cost per stored kilowatt-hour increases.

When charging, voltage, current, and temperature must be kept within certain limits. Excessively high charging currents lead to increased heating of the cells and stress the electrodes. This can be particularly problematic at lower temperatures or when the battery is already at a high state of charge. Under unfavorable conditions, metallic lithium may deposit on the anode instead of being properly stored in the electrode material. This causes usable lithium to be lost and the battery’s capacity to decrease permanently.

Inaccurate or poorly developed charging electronics can also reduce lifespan. If individual cells in a battery pack are not sufficiently monitored and balanced, some cells may be charged or discharged more than others. Since the weakest cell often limits the usable capacity of the entire battery pack, even a slight imbalance between the cells can impair the performance of the overall system. A good battery management system therefore monitors cell voltages, temperatures, and currents, preventing critical operating conditions.

Similar effects occur with unsuitable discharge currents. If a battery is subjected to a very high current, greater electrical losses occur due to its internal resistance. Part of the stored energy is not delivered as usable energy but is converted into heat. The higher the current, the more these losses increase. The additional heating further accelerates chemical aging processes within the cell.

High discharge currents also place greater stress on the electrode materials. During fast charge and discharge cycles, large quantities of lithium ions must move quickly through the electrolyte and electrodes. This creates stronger concentration differences and mechanical stresses in the electrode material. Over many cycles, this can lead to changes and fine cracks in the electrode structure, further decreasing the usable capacity and performance.

Therefore, for the cost-effectiveness of a battery system, not only is a large capacity crucial. Equally important are high-quality charging and power electronics, effective temperature management, and appropriate limits on charging and discharging currents. A battery used within favorable operating ranges can achieve significantly more charge cycles. Thus, its purchase price spreads over a larger amount of stored and delivered energy. Well-designed electronics can thus significantly reduce the total costs of the battery system despite higher initial costs while increasing lifespan and reliability.