Silicon-Embedded Polymer-Coated Carbon Core for Battery Anodes
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Solution Overview
Problem
The weak adhesive strength between carbon and silicon interfaces in silicon-based negative electrode active materials leads to reduced conductivity and increased irreversible capacity in lithium secondary batteries, affecting their capacity and efficiency.
Innovation Solution
A negative electrode active material particle is developed with a carbon-based core coated by a polymer shell, where silicon-based active material particles are embedded and partially exposed, enhancing adhesive strength and conductivity through electrostatic attraction and electron transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silicon-based active material is used to increase capacity, then energy density is improved, but adhesive strength between carbon and silicon deteriorates
Solution Approach 1:
A polymer shell acts as an intermediary material between the carbon-based core and silicon-based active material particles. The polymer coating on the carbon core provides anchoring sites for silicon particles, thereby improving the adhesive strength at the carbon-silicon interface while maintaining the high capacity benefits of silicon-based materials.
Solution Approach 2:
The invention creates a composite structure consisting of a carbon-based core, a polymer shell, and embedded silicon-based active material particles. This composite architecture combines the advantages of carbon (structural stability), polymer (adhesive properties), and silicon (high capacity) to resolve the contradiction between energy density and adhesive strength.
2Quantity of substance
If silicon-based active material is used to increase capacity, then energy density is improved, but conductivity deteriorates
Solution Approach 1:
The polymer shell serves as a conductive intermediary that facilitates electron transfer between the carbon core and silicon particles. By selecting polymers with appropriate conductive properties, the invention maintains electrical conductivity while enabling the high capacity utilization of silicon-based active material.
Solution Approach 2:
The structure embeds silicon-based active material particles within the polymer shell that surrounds the carbon core, creating a nested configuration. This nesting arrangement ensures close contact between conductive components (carbon and polymer) and the active silicon material, maintaining conductivity while maximizing energy density.
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 configuration improves conductivity and reduces irreversible capacity, maintaining high energy density and efficiency by ensuring silicon-based active materials are in direct contact with the conductor, while preventing deintercalation during the electrode manufacturing process.
Implementation Method 1
enhancing adhesive strength and conductivity through electrostatic attraction and electron transfer
Implementation Method 2
enhancing adhesive strength and conductivity through electrostatic attraction and electron transfer
Data Source
AI summary
The present disclosure relates to a negative electrode active material and a secondary battery including the same, and in particular, provides a negative electrode active material particle including a core including a carbon-based active material, and a shell surrounding the core and including a polymer, wherein silicon-based active material particles are embedded in the shell, and at least a part of the silicon-based active material particles is exposed to a surface of the shell.