Silicon Anode Active Material With Mg-Mn Silicate for Low Resistance
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Solution Overview
Problem
Existing silicon-based negative electrode active materials in secondary batteries face challenges in achieving high cycle capacity retention rates and low direct current resistance, necessitating improved electrochemical performance.
Innovation Solution
A silicon-based negative electrode active material comprising a combination of element Mg and element Mn, forming a silicate structure that enhances electron conductivity and reduces reactions with electrolyte, thereby improving cycle capacity retention and lowering resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silicon-based negative electrode active material is used to achieve high capacity, then capacity is improved, but cycle capacity retention rate deteriorates
Solution Approach 1:
The patent applies composite materials by combining silicon-based active material with a coating layer containing Mg and Mn elements. This composite structure maintains the high capacity of silicon while the coating layer protects the silicon particles, preventing degradation during cycling and improving cycle capacity retention rate.
Solution Approach 2:
The patent changes the chemical composition parameters of the coating layer by specifically incorporating Mg and Mn elements in controlled amounts. This parameter modification optimizes both the protective function and electrochemical performance, resolving the contradiction between capacity and cycle stability.
2Quantity of substance
If silicon-based negative electrode active material is used to achieve high capacity, then capacity is improved, but direct current resistance worsens
Solution Approach 1:
The coating layer composite containing Mg and Mn elements serves as a conductive network that reduces direct current resistance. The Mg and Mn form a conductive matrix around silicon particles, enabling efficient electron transport while maintaining the high capacity of the silicon-based active material.
Solution Approach 2:
The Mg-Mn coating layer acts as an intermediary between the silicon particles and the electrolyte, providing a conductive pathway for electrons while preventing direct harmful interactions. This intermediary layer reduces resistance without compromising capacity.
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 combination of Mg and Mn in the silicon-based negative electrode active material significantly improves cycle performance and reduces direct current resistance, resulting in higher energy density and lower resistance in secondary batteries.
Implementation Method 1
element Mn has abundant valence states and abundant active sites, which improves the electron conductivity of the negative electrode active material and effectively reduces the direct current resistance (DCR)
Implementation Method 2
the high-strength bonding between element Mg and the silicon oxide material to form a silicate Mg structure can reduce the reaction between the active material and the electrolyte solution
Data Source
AI summary
This application provides a silicon-based negative electrode active material. The silicon-based negative electrode active material includes a silicate containing an alkali metal element. The silicon-based negative electrode active material contains element Mg and element Mn.