NEW Li-CONDUCTOR PROTOTYPES IN THE Li-Hf-Na-Cl CHEMICAL SPACE FOR SOLID-STATE BATTERIES

Smart overview of the Invention

The patent application introduces a lithium-containing compound with the formula LiHfNaCl₆, designed for use in solid-state batteries (SSBs). This compound can be incorporated into various layers of a lithium battery, such as the solid electrolyte layer, catholyte, or anolyte. The innovation aims to enhance the performance and safety of SSBs, a crucial component in advancing portable electronics and electric vehicles.

Background

Traditional lithium-ion batteries use organic liquid electrolytes, which pose safety risks due to flammability and leakage. Solid-state batteries are emerging as a safer and more efficient alternative, offering improved energy density. The development of solid-state lithium-ion conductors (SSLICs) is essential for this transition. While sulfide-based SSLICs are known for high ionic conductivities, they have safety and stability issues. Oxide SSLICs offer better stability but lack in conductivity and deformability. Halide materials, particularly those in the Li—Hf—Na—Cl chemical space, show promise in addressing these challenges.

Technical Advancements

The disclosed lithium-containing compound, LiHfNaCl₆, is identified through high-throughput searches using machine learning algorithms. It offers high ionic conductivity and deformability, crucial for the practical application of SSBs. The compound can be crystallized in various space groups, such as R3, C2, and P-1, each providing distinct structural advantages. These properties make it a viable candidate for replacing traditional liquid electrolytes in lithium batteries.

Applications

• As a solid electrolyte layer in lithium solid-state batteries, enhancing safety and performance.
• As a catholyte or cathode coating, improving the interface and stability of the cathode material.
• As an anolyte with alloy anodes, providing better compatibility and conductivity in the anode layer.

Implications

The introduction of LiHfNaCl₆ in SSBs could significantly advance the commercialization of these batteries by addressing current limitations in ionic conductivity, stability, and deformability. This innovation holds potential for widespread adoption in various applications, from consumer electronics to electric vehicles, marking a step forward in the development of safer and more efficient energy storage systems.