With the world striving to hit the Net Zero target faster, the drive to renewable energy sources is fast gaining momentum.
Case in point: In 2022, renewable energy accounted for 23% of the total energy consumed in the EU – a jump of 21.9% from 2021. However, the efficiency of these energy sources hinges on the battery they use as an off-grid energy storage for storing the surplus energy generated.
Lithium-ion batteries are widely used in this case due to their high efficiency and incredible energy density.
In this article, we will dig deeper into the significance of integrating lithium-ion batteries with renewable energy systems.
Renewable Energy Systems Getting a Boost
Renewable energy, particularly solar, wind, and biomass, is experiencing a surge as the move toward the green energy gains traction. This drive is further propelled by businesses striving to decouple greenhouse gas emissions from their operations.
Case in point: In 2023, renewable energy added an estimated 507 GW of electricity to the grid in 2023 – 50% higher than in 2022. This fast adoption of clean energy is driven by the constant policy support from over 130 countries.
This data underlines the growing momentum behind renewable energy, driven by technological advancements, reducing costs, and an amplified focus on enabling a sustainable, resilient, and low-carbon future.
Renewable Energy Systems Implications
Adopting renewable energy as an alternative source of energy is critical to stepping into a more sustainable and greener future. It helps evade the impact of abrupt climate change due to increased greenhouse gas emissions (GHG) the world is grappling with badly.
One of the key anthropogenic reasons behind climate change is the energy generation sector. Case in point: Energy-related GHG emissions account for over 80% of total anthropogenic emissions worldwide whereas, electric generation alone shares a staggering 40%. Transitioning to renewables helps the sector significantly decouple GHG emissions, thus helping fight global warming.
Furthermore, the power generation process using renewables is much cleaner compared to the traditional method that depends on the combustion of fossil fuel. By limiting the inhalation of toxic gases such as sulphur dioxide, nitrogen oxides, and particulate matter, renewables significantly improve air quality.
Needless to mention, one of the key components of renewable energy systems is storage.
Significance of Battery Storage in Renewable Energy Systems
At the core of efficient energy storage in renewable systems are Battery Energy Storage Systems (BESS). The importance of energy storage in the green energy transition:
- Renewable energy is great for reducing the carbon footprint of the power generation industry. However, these energy sources are intermittent in nature, meaning, energy generation fluctuates based on a range of factors – weather, latitude, etc. It induces the need for storing the extra energy generated during the peak time and supplying it when the demand is high. BESS does this for you. Thus, a stable and steady flow of energy supply can be ensured.
- With a reliable BESS in action, you can also ensure the grid is stable by enabling the authority to use the stored energy as a backup supply. With BESS, energy can be supplied or stored on par with grid demand. This way, an energy storage system acts as a rampart against unwanted blackouts or other operational disruptions in the process of supplying power from the grid.
Lithium-ion batteries are mainly integrated into advanced BESS systems to ensure the system is compact and lightweight. Let’s look into the reasons behind the mass adoption of lithium-ion batteries in energy storage systems with renewables.
Benefits of Li-ion Batteries in Renewable Energy Systems
Lithium-ion batteries have long been considered the backbone of an advanced BESS system. Let’s go through why:
High Energy Density
Lithium-ion batteries exhibit a high energy density of 200-300 Wh/kg, meaning, for each kilogram of battery weight, energy equivalent to 200 to 300 watt-hours can be stored. This high energy density allows lithium batteries to store a huge amount of energy in a compact packet.
This feature is especially beneficial for renewable energy systems where storing extra energy produced is critical to deal with the intermittency of the sources. The result is optimised energy usage and augmented grid stability.
Fast Charging and Discharging
Lithium-ion batteries show excellent charging and discharging rates – they can absorb and release energy at a high speed.
This feature is especially beneficial in renewable energy systems where fast absorption and discharge of surplus energy are critical. The fast charging and discharging of lithium-ion batteries also streamline the process of energy transition and management within the system.
Long Life Cycle
Most Li-ion batteries have a lifespan of over 500 cycles. This longer lifespan of Li-ion batteries makes them highly resilient, durable, and stable, valued in the renewable energy sector. Among all types of Li-ion batteries, LiFePO4 batteries have the highest lifespan.
On average, LiFePO4 batteries have a life cycle of around 2000 to 7000 charging-discharging cycles determined by a range of factors – charging protocols, usage frequency, temperature conditions, depth of discharge, etc. For applications, where endured, durable, and cost-effective energy storage is required, LiFePO4 can be the best choice.
Scalability
Lithium-ion battery systems exhibit excellent scalability; meaning the configuration (size and capacity of the battery) can be tailored based on the energy storage requirement of the application.
It also makes the battery system to be highly adaptable to fluctuating energy generated from different renewable sources, thereby facilitating energy storage and supply. Adaptable to fluctuating energy generation from renewable sources, facilitating efficient energy storage and distribution.
High Temperature Capacity
Another key benefit of Li-ion batteries for renewable energy systems is their capability to endure high temperatures without any performance degradation. For renewable energy systems running in harsh environments, using Li-ion batteries stands as a strategic imperative for reliable and efficient operations.
How Li-ion Batteries Work with Renewable Energy Systems
Lithium-ion batteries store and release energy in a renewable energy system based on the electromechanical process.
During the charging phase, the battery absorbs and stores the surplus energy generated in a renewable energy system by shifting lithium ions from the cathode to the anode through a solution of lithium salt as an electrolyte.
In case of any surge in energy demand, Li-ion batteries reverse the charging process and drive back to the cathode, thus, releasing the stored energy. A reliable and steady flow of electricity supply is ensured by this fast charging-discharging rate, thereby contributing to grid stability.
