Comparative Analysis of Lithium-Ion Batteries and Liquid Air Energy Storage Systems for Grid Use

The global energy landscape is undergoing a paradigm shift driven by the increasing penetration of renewable energy sources into the electrical power grid. However, the variable nature of renewables presents significant challenges for grid stability and reliability. Long-term grid-scale energy storage is crucial to overcoming these challenges and facilitating the transition from carbon-based generation. Effective long-term grid-scale energy storage solutions must possess large energy capacity, long lifespans, geographical flexibility, and be economically viable and technologically ready. Liquid Air Energy Storage (LAES) emerges as a promising solution, offering similar benefits to Compressed Air Energy Storage (CAES) but with higher energy densities (typically 5 to 10 times higher) and without the geographical constraints of underground caverns or the uneconomical nature of pressurised tanks. Lithium Battery Energy Storage (LiBES) has driven much of the growth in the stationary energy storage market. However, its limitations with regards to energy capacity and long-term storage suitability are well established. Furthermore, the synthetic inertia of LiBES, reliant on software-based control, lacks the inherent reliability of LAES’s physical inertia, which provides a direct and robust response to grid fluctuations. A comparative analysis of LAES versus LiBES is conducted from technical, environmental, and economic perspectives. The findings highlight the suitability of LAES over LiBES for long-term grid-scale applications. As a general trend, LAES offers a lower levelised cost of storage (LCOS) than LiBES demonstrating improved economic performance in scenarios with lower cycling frequencies and higher discount rates.