Anode SEI Formation via Pre-Alkaliation Without Cycling
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Solution Overview
Problem
The formation of Solid Electrolyte Interface (SEI) layers in rechargeable metal-ion batteries through electrochemical methods is costly, time-consuming, and requires complex equipment, contributing significantly to manufacturing costs and inefficiencies.
Innovation Solution
A non-electrochemical process for SEI layer formation using pre-alkaliated anodes, where the anode is pre-alkaliated to a dosage greater than or equal to the 1st cycle irreversible loss, and the cell is assembled with a cathode, separator, and electrolyte, then soaked without external voltage or current to form the SEI layer chemically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrochemical formation cycling is used to form SEI layer, then SEI layer is formed on anode, but manufacturing cost increases and process time extends
Solution Approach 1:
The anode is pre-alkaliated before cell assembly by exposing it to alkali metal vapor or solution, which pre-forms the SEI layer on the anode surface. This preliminary action eliminates the need for subsequent electrochemical formation cycling, directly resolving the contradiction by achieving SEI formation without the time-consuming and costly electrochemical process.
Solution Approach 2:
The patent replaces the electrochemical formation process (which requires complex cycling equipment, voltage control systems, and monitoring infrastructure) with a simple chemical pre-alkaliation process. This substitution eliminates the need for specialized formation cycling equipment and reduces manufacturing complexity while maintaining SEI layer formation effectiveness.
2Reliability
If electrochemical formation cycling is used, then SEI layer is formed, but capital equipment cost and energy consumption increase
Solution Approach 1:
The complex electrochemical formation equipment including cycling stations, voltage control systems, and monitoring infrastructure is replaced with simple pre-alkaliation equipment such as vapor deposition chambers or solution treatment apparatus. This substitution dramatically reduces device complexity and capital equipment costs while achieving the same SEI layer formation objective.
Solution Approach 2:
The patent uses inexpensive pre-alkaliation methods such as exposing anodes to alkali metal vapor or dipping them in alkali metal solutions, replacing the need for expensive and complex electrochemical formation equipment. This approach uses simple, low-cost processes that eliminate the need for sophisticated formation cycling infrastructure.
3Ease of manufacture
If pre-alkaliation is performed, then SEI layer formation is simplified, but alkali metal dosage must be controlled
Solution Approach 1:
The patent incorporates feedback mechanisms to monitor and control the pre-alkaliation process, such as measuring anode potential, monitoring alkali metal consumption, or detecting SEI layer formation progress. This feedback allows real-time adjustment of alkali metal dosage to achieve optimal SEI layer formation without excessive alkali metal consumption, resolving the contradiction between ease of manufacture and manufacturing precision.
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 method reduces manufacturing time, capital equipment requirements, and energy consumption by eliminating the need for electrochemical formation, while maintaining battery efficiency and performance.
Implementation Method 1
The non-electrochemical method involves soaking or maintaining the battery internal components in an electrolyte before conventional charging, cycling and/or operation
Data Source
AI summary
The present invention relates to a method for forming an SEI layer on an anode by using a non-electrochemical process for alkaliating anodes, resulting in reductions of the manufacturing capital requirements, time investments and energy consumed during industrial battery production.