Battery Electrode Recess Regions for Low Temperature Ion Transport
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Solution Overview
Problem
Current battery technologies face challenges in improving low temperature characteristics, suppressing capacity deterioration during high output discharge, enhancing rapid charging capabilities, preventing chemical short circuits, and increasing overcharge resistance.
Innovation Solution
A battery design incorporating a cathode and anode active material layers with specific recess and deep regions for electrolyte and solid particle distribution, using electrolyte solutions containing unsaturated cyclic carbonate esters, halogenated carbonate esters, sulfinyl or sulfonyl compounds, aromatic compounds, dinitrile compounds, and metal salts to optimize ion mobility and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If particles are disposed on a surface of a separator or in electrolytes to increase performance, then battery performance is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by concentrating solid particles specifically in recess regions of the electrode where electrolyte accumulation naturally occurs, rather than uniformly distributing them throughout the battery. This localized approach enhances performance at critical interfaces while minimizing overall complexity
Solution Approach 2:
The patent uses solid particles as intermediary substances that mediate between the electrolyte and electrode active material particles. These particles facilitate ion transport and improve electrochemical reactions without requiring fundamental changes to the battery structure
2Reliability
If an additive is added to an electrolyte solution to increase performance, then battery performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the physical state parameter of the additive from dissolved (liquid electrolyte additive) to solid particulate form. This parameter change allows for easier handling, more stable concentration control, and reduced sensitivity to manufacturing variations while maintaining performance benefits
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 solution enhances low temperature performance, maintains high capacity and rapid charging capabilities, reduces discharge capacity loss, improves resistance to chemical short circuits, and enhances overcharge resistance.
Implementation Method 1
electrolytes comprising an electrolyte solution; and solid particles... The solid particles in the recess impregnation region of the anode side have a concentration that is 30 volume % or more... improve a low temperature characteristic... improve a rapid charging characteristic
Implementation Method 2
electrolytes comprising an electrolyte solution... The electrolyte solution comprises at least one kind of an unsaturated cyclic carbonate ester... halogenated carbonate esters... sulfinyl or sulfonyl compounds... improve a low temperature characteristic... suppress capacity deterioration
Implementation Method 3
solid particles... improve a resistance to a chemical short circuit caused by a chemical reaction such as metal precipitation inside the battery
Data Source
AI summary
Between an anode active material layer and a separator, a recess impregnation region of an anode side in which electrolytes and solid particles are disposed and including a recess that is located between adjacent anode active material particles positioned on the outermost surface of the anode active material layer is formed. Between a cathode active material layer and a separator, a recess impregnation region of a cathode side in which electrolytes and solid particles are disposed and including a recess that is located between adjacent cathode active material particles positioned on the outermost surface of the cathode active material layer is formed. The solid particles in the recess impregnation regions of the cathode side and the anode side have a concentration that is 30 volume % or more.