Rechargeable Metal Halide Battery Cathode Design
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Solution Overview
Problem
Conventional lithium-ion batteries face challenges with low energy density and high costs due to the use of expensive cathode materials like cobalt and nickel, and lithium metal anodes prone to dendrite formation, limiting their efficiency and application in high-energy devices such as electric vehicles.
Innovation Solution
A rechargeable lithium battery design incorporating a solid phase metal halide as an active cathode material, which is deposited on or within an electrically conductive material, reducing the need for heavy metals and increasing energy density, while using a solvent-based electrolyte and oxidizing gas to facilitate redox reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal anodes are used to achieve high energy storage capacity, then energy density is improved, but dendrite formation occurs causing short circuits and reduced reliability
Solution Approach 1:
A solid electrolyte interphase (SEI) layer is introduced as an intermediary between the lithium metal anode and the electrolyte. This SEI layer acts as a protective mediator that prevents direct contact and dendrite-induced short circuits while still allowing lithium ion transport, thus maintaining high energy storage capacity while improving reliability
Solution Approach 2:
A thin film SEI layer is formed on the lithium metal anode surface. This thin film structure provides protection against dendrite penetration and short circuits while maintaining ionic conductivity for lithium ions, enabling the system to achieve both high energy density and improved safety
2Reliability
If conventional lithium-ion cathode materials (NMC, NCA, LCO, LFP) are used, then battery performance is achieved, but energy density is limited and manufacturing costs are high
Solution Approach 1:
The cathode material is changed from conventional lithium-ion materials (NMC, NCA, LCO, LFP) to a metal halide-based cathode. This parameter change in material composition enables significantly higher energy density while maintaining acceptable battery performance, as the metal halide cathode can accommodate the large amount of lithium ions extracted from the lithium metal anode
3Use of energy by moving object
If lithium-oxygen or lithium-air batteries are used to achieve high theoretical specific energy, then energy density is improved three to five times, but difficulty in finding inexpensive cathode materials that can accommodate large lithium ion extraction remains
Solution Approach 1:
The patent employs a metal halide cathode material that is inexpensive and can be readily synthesized, replacing the expensive and difficult-to-find cathode materials required for lithium-oxygen or lithium-air batteries. This enables high specific energy (three to five times greater than conventional lithium ion batteries) while maintaining ease of manufacture and availability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances cell-level energy density, reduces manufacturing costs, and enables long-range electric vehicle applications by achieving higher energy storage capacity and stability without the use of cobalt or nickel, with improved cycling performance and efficiency.
Implementation Method 1
a rechargeable lithium battery design incorporating a solid phase metal halide as an active cathode material... using a solvent-based electrolyte and oxidizing gas to facilitate redox reactions
Implementation Method 2
a solid electrolyte interphase (SEI) layer contacting the anode, the SEI layer including an oxide of the metal ions
Implementation Method 3
the total amount of the metal halide in the cathode exceeds the amount of the metal halide that is dissolvable in the electrolyte
Data Source
AI summary
A battery includes an anode, an electrolyte including a solvent and at least one ion conducting salt, and a cathode including a metal halide salt incorporated into an electrically conductive material. The electrolyte is in contact with the anode, the cathode, and an oxidizing gas.