US 12,725,835 B2 · Multi-regime electrolyte system for stationary lithium-sulfur batteries

Abstract

The present disclosure provides a novel electrolyte system for lithium-based batteries in stationary storage applications. Unlike conventional electrolytes that suffer from limited cycle life and stability, this system incorporates strategically selected sacrificial additives that decompose in a predetermined sequence during cycling. This controlled breakdown forms a self-evolving electrode-electrolyte interface, addressing the limitations of existing technologies by mitigating polysulfide shuttling, enhancing long-term stability, and maintaining consistent ionic conductivity. The system's ability to adapt to changing operational conditions enables ultra-high cycle life, potentially revolutionizing the performance and longevity of stationary energy storage systems.

Claims22

Dependent claims

An electrolyte system for stationary storage application, comprising:

at least one solvent comprising at least one ether, wherein the at least one ether is selected from the group consisting of dimethoxyethane (DME), dioxolane (DOL), and combinations thereof;
at least one electron withdrawing compound;
at least one lithium ion-transporting compound;
and
at least one sacrificial additive comprising dicyandiamide (DCDA), wherein the at least one sacrificial additive is configured to undergo sequential decomposition during battery cycling, wherein the sequential decomposition is controlled by respective breakdown rates of each sacrificial additive;
wherein the electrolyte system is configured to facilitate lithium polysulfide conversion via redox reactions.

3 more elements

An electrolyte system, comprising:

at least one solvent comprising at least one ether, wherein the at least one ether is selected from the group consisting of dimethoxyethane (DME), dioxolane (DOL), and combinations thereof;
at least one electron withdrawing compound;
at least one lithium ion-transporting compound;
at least one sacrificial additive comprising dicyandiamide (DCDA);
and
a self-evolving electrode-electrolyte interface formed on an electrode surface by a breakdown of the at least one sacrificial additive, wherein the electrode-electrolyte interface provides ultra-high cycle life comprising greater charge-discharge cycles with less capacity fade compared to conventional electrolyte systems for stationary storage applications;
wherein the electrolyte system is configured to facilitate lithium polysulfide conversion via redox reactions.

4 more elements

Dependencies are inferred from the claim text.

Multi-regime electrolyte system for stationary lithium-sulfur batteries

Life of this patent

Multi-regime electrolyte system for stationary lithium-sulfur batteries

Life of this patent

Abstract

Claims22