Battery Negative Electrode Plate Gel-Liquid Electrolyte Stabilization
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Solution Overview
Problem
The volume expansion of the negative electrode plate during battery cycling leads to a decrease in kinetic performance, resulting in reduced cycling performance.
Innovation Solution
A battery design incorporating a negative electrode plate with an active layer containing a gel electrolyte and a liquid electrolyte, where the mass ratio of the gel electrolyte to the liquid electrolyte is optimized, stabilizing the liquid electrolyte during expansion and maintaining kinetic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the active substance volume expansion is accommodated, then the cycling performance is improved, but the liquid electrolyte may leak due to squeezing
Solution Approach 1:
The gel electrolyte serves as an intermediary substance between the expanding active substance and the liquid electrolyte. It absorbs the mechanical stress from volume expansion and prevents direct transmission of squeezing forces to the liquid electrolyte, thereby preventing leakage while accommodating expansion
Solution Approach 2:
The electrolyte system combines gel electrolyte and liquid electrolyte in a composite structure. The gel electrolyte provides structural stability and stress absorption, while the liquid electrolyte maintains ionic conductivity, creating a synergistic system that resolves the contradiction between expansion accommodation and leakage prevention
2Reliability
If the gel electrolyte content is increased to stabilize the liquid electrolyte, then the cycling performance improves, but the ionic conductivity may decrease
Solution Approach 1:
The patent optimizes the mass ratio parameter of gel electrolyte to liquid electrolyte within the range of 7:3 to 9.5:0.5. This parameter adjustment balances the competing requirements: sufficient gel electrolyte for stability and stress absorption, while maintaining adequate liquid electrolyte for ionic conductivity
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 optimized electrolyte ratio stabilizes the liquid electrolyte, reducing the risk of leakage and enhancing the cycling performance of the battery.
Implementation Method 1
the gel electrolyte can stably fix the liquid electrolyte in the negative electrode plate
Data Source
Figure 1~2
Figure 3
AI summary
The present application provides a battery, the preparation of a battery, and a powered device. The battery includes a negative electrode plate that includes a negative electrode current collector and an active layer. The active layer is located on at least one surface of the negative electrode current collector. The active layer includes an active substance, a gel electrolyte, and a liquid electrolyte. An expansion rate of the negative electrode plate is greater than or equal to 10%. When the active substance expands during cycling, the gel electrolyte can stably fix the liquid electrolyte in the negative electrode plate, thereby reducing the risk of squeezing-induced leakage of a liquid electrolyte solution due to the expansion of the active substance. Thus, the negative electrode plate can maintain a relatively stable kinetic performance, thereby improving the cycling performance of the battery.