Pre-lithiated Anode Materials for Lithium-Ion Batteries
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Solution Overview
Problem
Lithium-ion batteries face significant capacity fade due to parasitic reactions at the alloy in full cells, which are not detected in half cells, leading to irreversible lithium consumption and reduced cycle life, despite efforts to compensate for irreversible capacity.
Innovation Solution
Incorporating reversible lithium into the electrochemically active material before cell assembly, which can be up to 50% of the reversible capacity, to mitigate parasitic reactions and enhance cycle life by providing a gradual lithium source and improving electronic and ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If reversible lithium is incorporated into the electrochemically active material before cell assembly, then cycle life is extended and capacity fade is reduced, but the device complexity increases due to additional processing steps
Solution Approach 1:
The patent applies preliminary action by incorporating reversible lithium into the electrochemically active material before cell assembly. This pre-lithiation process ensures that the material starts with the necessary lithium content to compensate for parasitic reactions, thereby extending cycle life and reducing capacity fade without requiring complex post-assembly modifications.
Solution Approach 2:
The patent utilizes parameter changes by controlling the amount of reversible lithium incorporated (4%-50% of reversible capacity) and managing lithium consumption rate (0.02%-0.2%). By optimizing these parameters, the patent achieves extended cycle life while maintaining manageable processing complexity through precise control of lithium content rather than complex structural modifications.
2Duration of action of stationary object
If reversible lithium is incorporated into the electrochemically active material before cell assembly, then energy density is maintained over multiple cycles, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by defining specific ranges for reversible lithium content (4%-50% of reversible capacity) and lithium consumption rate (0.02%-0.2%). These controlled parameter changes enable energy density retention over multiple cycles while establishing clear manufacturing specifications that balance precision requirements with practical manufacturability.
Solution Approach 2:
The patent uses copying by creating electrochemically active materials with standardized lithium content specifications that can be replicated across production batches. By establishing consistent lithium incorporation protocols within defined parameter ranges, the patent ensures energy density retention while reducing the burden of extreme manufacturing precision through repeatable processes.
3Reliability
If reversible lithium is incorporated into the electrochemically active material before cell assembly, then parasitic reactions are mitigated, but the ease of manufacture decreases due to additional lithiation steps
Solution Approach 1:
The patent applies preliminary action by incorporating reversible lithium into the electrochemically active material before cell assembly. This pre-lithiation mitigates parasitic reactions during initial cycles, improving performance stability. The process is integrated into the material preparation stage, minimizing additional manufacturing steps and maintaining reasonable ease of manufacture.
Solution Approach 2:
The patent uses self-service by allowing the electrochemically active material to provide its own lithium through the incorporated reversible lithium. This self-lithiation capability reduces the need for external lithium sources and complex assembly procedures, thereby maintaining ease of manufacture while improving performance stability through reduced parasitic reactions.
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 approach extends cycle life, reduces capacity fade, and maintains higher energy density over multiple cycles by managing lithium consumption and promoting stable electrode performance.
Implementation Method 1
an electrochemically active material is provided. The electrochemically active material includes, prior to incorporation in an electrochemical full cell, reversible lithium corresponding to between 4% and 50% of the reversible capacity of the electrochemically active material
Data Source
AI summary
An electrochemically active material includes, prior to incorporation in an electrochemical full cell, reversible lithium corresponding to between 4% and 50% of the reversible capacity of the electrochemically active material. The electrochemically active material has a lithium consumption rate between 0.05% and 0.2%.