Multi-Stage Oxygen Compressor for Lithium-Oxygen Battery Thermal Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium-oxygen batteries face challenges such as dendrite formation, moisture protection, achieving high specific energy and power levels, reducing voltage hysteresis, and improving cycle life, which limit their commercial viability for electric vehicles.
Innovation Solution
A vehicular battery system with a multi-stage oxygen compressor and closed oxygen handling system, where oxygen is compressed and stored on board, allowing for efficient and compact oxygen management, and a battery control system to regulate temperature and flow rates, ensuring efficient energy use and minimizing contamination risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-stage compressor is used to compress oxygen to high pressure (>100 bar), then the system structure is simple, but the temperature rise is excessive and energy efficiency is low
Solution Approach 1:
The compression process is divided into multiple stages with intermediate cooling periods. The compressor includes a first stage that compresses oxygen to intermediate pressure, followed by a first cooling period, then a second stage that compresses to final high pressure, followed by a second cooling period. This segmentation reduces temperature rise and improves energy efficiency compared to single-stage compression.
2Use of energy by moving object
If oxygen is stored at high pressure in a compact reservoir, then the vehicle range is extended and energy density is improved, but the risk of contamination and safety hazards increases
Solution Approach 1:
The system uses a closed-loop architecture where oxygen is compressed and stored in a sealed reservoir, isolated from the external environment. The multi-stage compression with intermediate cooling prevents overheating and maintains system integrity. The electrolyte circulation system also provides thermal management, creating a controlled inert environment that prevents contamination while enabling high-pressure storage for extended range.
3Use of energy by moving object
If high-capacity positive electrode materials are used with lithium metal negative electrode, then the specific energy is greatly increased, but the voltage hysteresis and cycle life are reduced
Solution Approach 1:
The system employs advanced electrode materials with optimized properties: the positive electrode uses high-capacity materials such as Li2O, BiF3, or FeF3, while the negative electrode uses lithium metal or lithium alloys. The electrolyte composition is specifically tailored to enable stable cycling with these high-capacity materials. The multi-stage compression and thermal management systems maintain optimal operating conditions, allowing the battery to achieve high specific energy while improving cycle life through controlled parameters.
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
The system achieves a compact, efficient, and cost-effective method for compressing and storing oxygen, enhancing battery performance, reducing energy losses, and increasing the vehicle's range while ensuring safety and minimizing external contamination.
Implementation Method 1
a multi-stage compressor operably connected to the reservoir and configured to compress oxygen into the reservoir
Implementation Method 2
a radiator operably connected to the compressor and configured to cool the compressed oxygen
Implementation Method 3
Lithium-oxygen batteries face challenges such as dendrite formation, moisture protection, achieving high specific energy and power levels
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A vehicular battery system includes a vehicular battery system stack including at least one negative electrode including a form of lithium, an oxygen reservoir having a first outlet operably connected to the vehicular battery system stack, a multistage compressor having a first inlet operably connected to the vehicular battery system stack, and a second outlet operably connected to a second inlet of the oxygen reservoir, and a cooling system operably connected to the multistage compressor and configured to provide a coolant to the multistage compressor to cool a compressed fluid within the multistage compressor.