Negative Electrode with Molten Salt and Silicon-Carbon Composite
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Solution Overview
Problem
Current secondary batteries face challenges in achieving high energy density, stability, and long service life, particularly in electronic devices and electric vehicles, due to limitations in negative electrode materials that affect battery characteristics such as capacity and thermal stability.
Innovation Solution
A negative electrode configuration for secondary batteries incorporating a combination of carbon-based and silicon-based materials, along with a normal temperature molten salt composition, which enhances ion conductivity and thermal stability, and a specific manufacturing process to ensure effective binding and distribution of these materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silicon-based materials are used as negative electrode active material to increase energy density, then battery capacity is improved, but thermal stability deteriorates
Solution Approach 1:
The patent employs a composite negative electrode structure combining silicon-based particles (providing high capacity) with carbon-containing particles (providing thermal stability). The silicon-based material constitutes 5-80 wt% of the negative electrode active material, while carbon-containing material makes up 20-95 wt%, creating a synergistic composite that achieves both high energy density and thermal stability.
2Reliability
If normal temperature molten salt composition is added to enhance ion conductivity, then battery performance is improved, but device complexity increases
Solution Approach 1:
The patent merges the electrolyte function with the negative electrode structure by incorporating normal temperature molten salt composition directly into the negative electrode. This integrated approach allows the molten salt to serve dual purposes: as part of the electrode matrix and as the ionic conductor, eliminating the need for separate electrolyte management systems.
3Quantity of substance
If carbon and silicon materials are combined to improve energy density, then battery characteristics are enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by creating a heterogeneous distribution pattern where silicon-based particles and carbon-containing particles are distributed in complementary zones within the negative electrode. The silicon-based material (5-80 wt%) provides high-capacity regions, while carbon-containing material (20-95 wt%) provides conductive and stable regions, with each material optimized for its specific functional role rather than uniform mixing.
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 proposed configuration significantly improves battery characteristics by stabilizing charge and discharge reactions, enhancing energy density, and maintaining thermal stability, leading to improved performance in electronic devices and electric vehicles.
Implementation Method 1
a normal temperature molten salt composition, which enhances ion conductivity
Implementation Method 2
the negative electrode contains a first negative electrode active material including a first material including carbon, and a second negative electrode active material including a second material including silicon
Data Source
AI summary
A secondary battery includes a positive electrode, a negative electrode including a first negative electrode active material, a second negative electrode active material, and a normal temperature molten salt composition, and an electrolytic solution. The first negative electrode active material includes a first material including carbon, and the second negative electrode active material includes a second material including silicon.