Grant awarded to Posh Electric for sodium-ion battery project funded by Electric Mobility Alliance
Posh Electric, a subsidiary of Posh Energy, has been awarded a grant by the Energy Market Authority (EMA) of Singapore for a trial of a sodium-ion battery energy storage system (BESS). The project, which will be conducted in partnership with the Institute of Materials Research and Engineering (IMRE) and Utraco Pte Ltd, aims to address the need for scalable and environmentally sustainable energy storage solutions to support Singapore's transition towards renewable energy.
The partnership will see the sodium-ion BESS being developed and deployed at Utraco's factory. The BESS will be integrated with 600 kW of rooftop solar arrays to store renewable energy, providing load-shifting capabilities and mitigating the intermittency of solar power.
Sodium-ion batteries are gaining recognition as a feasible alternative to lithium-ion batteries due to their natural abundance, cost-effectiveness, and enhanced safety features. Sodium is over 1,000 times more abundant than lithium, and its extraction involves a simpler process with a reduced environmental footprint.
Posh Electric has developed unique battery control hardware and software solutions for managing sodium-ion batteries. The company is eager to demonstrate the benefits of their sodium-ion battery project in Singapore and beyond.
Key Differences between Sodium-Ion and Lithium-Ion Batteries
Sodium-ion batteries (SIBs) and lithium-ion batteries (LIBs) are both rechargeable battery technologies, with some key differences in performance, cost, and applications.
Energy Density
Sodium-ion batteries currently have a lower energy density than lithium-ion batteries. Sodium-ion typically deliver around 140–160 Wh/kg, with advanced prototypes reaching about 175 Wh/kg, comparable to lithium iron phosphate (LFP) lithium-ion cells. In contrast, standard lithium-ion batteries deliver about 150–220 Wh/kg. This means lithium-ion batteries provide longer range in electric vehicles or longer runtime in devices per charge.
Cost and Material Availability
Sodium is abundant and inexpensive compared to lithium, which is scarcer and geographically concentrated. Sodium-ion batteries often do not require costly or scarce materials like cobalt, copper, or nickel, and some designs use abundant iron-based cathodes (e.g., NaFeO_2). This leads to lower materials cost and greater sustainability for sodium-ion batteries.
Charge Rate and Cycle Life
Sodium-ion batteries generally charge faster and exhibit a cycle life approximately three times longer than lithium-ion batteries, indicating greater durability over many charge/discharge cycles. Lithium-ion batteries charge slower and typically have shorter cycle life.
Performance Under Load
Lithium-ion batteries maintain stable voltage better under high current loads due to lower internal resistance and a flatter voltage curve. Sodium-ion batteries experience greater voltage drop under load, resulting in somewhat reduced usable capacity at high discharge rates.
Safety
Sodium-ion batteries, particularly aqueous variants, offer better safety characteristics due to reduced flammability compared to typical lithium-ion chemistries. This can be advantageous in applications where safety is critical.
Operating Principle
Both battery types operate with similar mechanisms, using ions moving between electrodes during charge and discharge. Sodium-ion batteries replace lithium ions with sodium ions, which have a larger ionic radius, sometimes causing slower kinetics but enabling the use of different abundant cathode materials.
Applications
Because of lower energy density but better cost and safety profile, sodium-ion batteries are promising for stationary energy storage, grid applications, and electric vehicles where cost and lifecycle are prioritized over maximum energy density. Lithium-ion batteries remain dominant in portable electronics and electric vehicles prioritizing range and energy density.
In summary, sodium-ion batteries offer advantages in cost, raw material abundance, charge speed, and longevity, but currently lag lithium-ion batteries in energy density and high-load efficiency. Ongoing research aims to improve sodium-ion performance, potentially making them competitive alternatives in specific sectors like grid storage and affordable EVs.
The trial in Singapore will involve the development and deployment of a 1-megawatt-hour (MWh) sodium-ion BESS. The project aims to demonstrate the feasibility and benefits of sodium-ion batteries in a real-world setting, paving the way for their wider adoption in the renewable energy sector.
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- The partnership between Posh Electric, IMRE, and Utraco aims to integrate the latest sodium-ion battery technology into the finance sector, potentially revolutionizing the way renewable energy is stored and managed in the realm of technology.
- The successful integration of sodium-ion batteries into Singapore's grid could spur further investments in science and technology, driving research towards improving the energy storage capacity and efficiency of these batteries, with far-reaching implications for the global finance and energy markets.
