Lithium-Ion Battery Electrode with High Dielectric Oxide Solid
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Solution Overview
Problem
Lithium-ion secondary batteries face degradation in output characteristics due to repeated charging and discharging, especially when the amount of electrolyte solution held by the electrode is low, leading to increased resistance and passive film formation on electrodes.
Innovation Solution
Incorporating high dielectric oxide solids and a concentrated electrolyte solution into the gaps between electrode active material particles, with a lithium salt concentration of 0.5 to 3.0 mol/L, to improve ionic conductivity and prevent uneven electrolyte distribution, thereby reducing resistance and maintaining high volume energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the packing density of electrode active material is increased to increase volume energy density, then the volume energy density is improved, but the gap between particles decreases leading to reduction of electrolyte solution held by the electrode
Solution Approach 1:
The invention changes the physical and chemical parameters of the electrolyte solution by increasing the lithium salt concentration to 0.5-3.0 mol/L, which fundamentally alters the electrolyte's properties to enable high ionic conductivity in low-volume conditions while maintaining stable electrochemical performance
Solution Approach 2:
The invention creates a composite system combining high-concentration electrolyte solution with solid oxide particles, where the solid oxide serves multiple functions: filling gaps between active material particles, providing additional lithium ion conduction pathways, and preventing direct contact between electrolyte and electrode surfaces to reduce decomposition
2Volume of stationary object
If the amount of electrolyte solution held by the electrode is low, then the volume energy density is improved, but the resistance increases due to lack of lithium ions
Solution Approach 1:
The invention fundamentally changes the electrolyte concentration parameter to 0.5-3.0 mol/L, which provides sufficient lithium ions even in reduced volumes, maintaining low resistance while enabling high volume energy density
Solution Approach 2:
Solid oxide particles are introduced as intermediary substances that facilitate lithium ion transport between active material particles, providing additional conduction pathways that compensate for reduced electrolyte volume and maintain stable resistance
3Productivity
If repeated charging and discharging are performed, then the battery capacity is utilized, but the electrolyte solution decomposes forming passive film increasing internal resistance
Solution Approach 1:
The high-concentration electrolyte solution is pre-configured in the electrode structure before cycling begins, establishing a stable ionic conduction environment that prevents decomposition and passive film formation during subsequent charge-discharge operations
Solution Approach 2:
Solid oxide particles act as protective intermediaries between the electrolyte solution and electrode active materials, preventing direct harmful interactions that lead to electrolyte decomposition and passive film formation during cycling
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 enhances the retention and penetration of the electrolyte solution, reduces resistance, and maintains high volume energy density even with low electrolyte amounts, improving battery durability and productivity.
Implementation Method 1
Incorporating high dielectric oxide solids and a concentrated electrolyte solution into the gaps between electrode active material particles, with a lithium salt concentration of 0.5 to 3.0 mol/L, to improve ionic conductivity
Implementation Method 2
a concentrated electrolyte solution, with a lithium salt concentration of 0.5 to 3.0 mol/L
Data Source
AI summary
Provided are an electrode for a lithium-ion secondary battery enabling the realization of a battery that has a high volume energy density and exhibits a low level of degradation in output due to repeated charging and discharging even in a case in which the amount of an electrolyte solution held by the electrode is low, and a lithium-ion secondary battery including the positive electrode.The coexistence of a high dielectric oxide solid and a highly concentrated electrolyte solution in a gap between articles of an active material inside the electrode is achieved.