Dry Electrode Composition for Flexible Solid-State SOC Tracking
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Solution Overview
Problem
Existing lithium-ion batteries pose a fire hazard due to the use of flammable organic electrolyte solutions, and there is a need for a safe, high-energy-density alternative like all solid-state batteries that can accurately monitor state of charge (SOC) during charging and discharging.
Innovation Solution
A method of manufacturing a dry electrode using olivine-based lithium compounds with specific chemical formulations and particle sizes, combined with a dry binder and conductive materials, is developed to create a flexible electrode structure that allows for accurate SOC monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If flammable organic electrolyte solutions are used in lithium-ion batteries, then high energy density is achieved, but fire hazard increases
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid (flammable organic electrolyte solution) to solid (solid electrolyte), fundamentally altering the safety parameter while maintaining energy density. This phase change eliminates the fire hazard associated with liquid electrolytes while preserving the high energy density capability.
Solution Approach 2:
The patent converts the potential harm of using high-energy-density materials by replacing the flammable liquid electrolyte with a non-flammable solid electrolyte. This transformation maintains the energy density advantage while eliminating the fire risk, effectively converting a harmful system into a safe one.
2Use of energy by moving object
If small average particle diameter olivine-based lithium compounds are used, then energy density is improved, but electrode flexibility deteriorates
Solution Approach 1:
The patent creates a composite electrode structure combining olivine-based lithium compounds with small average particle diameter (for high energy density) and other materials that provide flexibility. This composite approach allows simultaneous achievement of high energy density and electrode flexibility by integrating materials with complementary properties.
Solution Approach 2:
The patent applies different material properties to different regions or aspects of the electrode. Small particle diameter olivine-based lithium compounds are used in specific regions to maximize energy density, while other components are used to provide flexibility, allowing each part to optimize its local function.
3Reliability
If solid electrolytes are used instead of liquid electrolytes, then safety is improved, but SOC monitoring capability deteriorates
Solution Approach 1:
The patent incorporates mechanisms to provide feedback on the state of charge (SOC) of the battery when using solid electrolytes. This feedback system enables accurate SOC monitoring by detecting voltage changes during charging and discharging, compensating for the reduced monitoring capability inherent in solid electrolyte systems while maintaining the safety advantages.
Data Source
AI summary
A dry electrode and a manufacturing method thereof are disclosed. The method includes preparing a first positive electrode active material Lia1Fex1B1-x1PO4-b1, a second positive electrode active material Lia2Nix2COy2Dz2O2-b2, a dry binder, and a dry conductive material; grinding the dry binder at 10° C. or less; forming a first mixture by mixing a first portion of the first positive electrode active material, the second positive electrode active material, the dry conductive material, and the grinded dry binder; forming a second mixture by mixing a second portion of the first positive electrode active material with the first mixture; forming a positive electrode active material layer by forming a film from the second mixture; and performing a lamination of the positive electrode active material layer on a positive electrode current collector.