Sulfur-Silicon Cell Architecture With Integrated Lithium Chip
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Solution Overview
Problem
Current lithium-ion batteries face challenges with high costs and limited energy density due to the use of lithiated metal oxides and graphite, while sulfur-silicon full cells are hindered by the need for hazardous and air-sensitive pre-lithiated materials, requiring specialized facilities for processing.
Innovation Solution
A novel battery architecture is introduced with a sulfur cathode and silicon anode, where a lithium source is integrated into the silicon anode, allowing for a unique electrode placement that bypasses the need for pre-lithiated materials, utilizing a lithium chip to form a complete circuit and maximize silicon slurry loading, thereby reducing costs and improving energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-lithiated materials are used in sulfur-silicon full cells, then electrochemical performance is improved, but manufacturing complexity and safety hazards increase due to air sensitivity and need for specialized facilities
Solution Approach 1:
The invention extracts the lithium source from the electrode materials themselves and places it as a separate lithium chip in direct contact with the silicon anode. This eliminates the need for pre-lithiated silicon or lithium sulfide, removing the air sensitivity and manufacturing complexity while maintaining the electrochemical performance through the integrated lithium source.
Solution Approach 2:
The battery is segmented into distinct functional components: a silicon anode, a sulfur cathode, and a separate lithium chip. This segmentation allows each component to be optimized independently and assembled without requiring pre-lithiated materials, simplifying manufacturing while maintaining performance.
2Reliability
If lithiated metal oxides and graphite are used in lithium-ion batteries, then battery functionality is achieved, but cost and energy density are limited
Solution Approach 1:
The invention changes the material parameters by replacing lithiated metal oxides with sulfur and graphite with silicon, combined with a separate lithium chip. This parameter change enables higher energy density while maintaining battery functionality through the novel electrode architecture.
3Quantity of substance
If silicon anode with integrated lithium source is used, then energy density and cost are improved, but electrode structure complexity increases
Solution Approach 1:
The invention merges the lithium source directly with the silicon anode by placing the lithium chip in direct contact with the silicon particles. This integration simplifies the overall structure by eliminating separate pre-lithiated materials while achieving high energy density through the combined silicon-lithium system.
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 sulfur-silicon full cell achieves an energy density of 350 Wh/kg for 260 cycles at C/10, demonstrating improved performance and potential cost savings, with the lithium chip slowly integrating into the system to enhance electrochemical reactions and stability.
Implementation Method 1
The sulfur-silicon full cell achieves an energy density of 350 Wh/kg for 260 cycles at C/10, demonstrating improved performance and potential cost savings, with the lithium chip slowly integrating into the system to enhance electrochemical reactions and stability.
Data Source
AI summary
A silicon and sulfur battery and methods are shown. In one example, the silicon and sulfur battery includes a lithium chip coupled to a silicon electrode. In some examples, the silicon electrode is formed from silicon nanoparticles and carbon.