Lithium-Ion Battery Anode Composition for Low End-of-Discharge Resistance
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Solution Overview
Problem
The existing lithium-ion secondary batteries experience an increase in anode layer resistance towards the end of discharge, leading to a decrease in reversible capacity with repeated charging and discharging.
Innovation Solution
A lithium-ion secondary battery design that includes a cathode layer, an anode layer with a specific composition of silver (Ag), tin (Sn), and lithium (Li), and a solid electrolyte layer, where the molar ratio of Sn to Ag in the anode layer is between 0.09 and 0.17, and the content of Sn is higher in the region closer to the electrolyte layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the anode layer composition is optimized for high capacity, then reversible capacity improves, but the complexity of material composition and manufacturing increases
Solution Approach 1:
The patent merges multiple functional elements (Sn for capacity, Ag for conductivity, Al for stability, S for electrochemical activity) into a single integrated anode layer material. This unified composite structure simplifies manufacturing compared to assembling separate functional layers, while achieving high reversible capacity through the synergistic effects of all elements working together in one material 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
This design effectively suppresses the increase in anode layer resistance at the end of discharge, maintains high reversible capacity, and improves charge/discharge efficiency.
Implementation Method 1
the cathode layer includes a cathode active material that is arranged to absorb and desorb lithium ions
Implementation Method 2
utilizes metal lithium deposition-dissolution reactions
Implementation Method 3
utilizes metal lithium deposition-dissolution reactions
Data Source
AI summary
A lithium-ion secondary battery that utilizes metal lithium deposition-dissolution reactions includes a cathode layer, an anode layer and an electrolyte layer between the cathode layer and the anode layer, the cathode layer includes a cathode active material that is arranged to absorb and desorb lithium ions, the anode layer includes a silver (Ag) element, a tin (Sn) element, and a lithium (Li) element, and a molar ratio of the Sn element to the Ag element (Sn/Ag) contained in the anode layer is 0.09 or higher and 0.17 or lower.