Improved Solid-State Battery Performance with Composite Electrodes
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Summary
Problems
All-solid-state secondary batteries face challenges with high ion conduction resistance and interface resistance due to electrode expansion/contraction, leading to degraded cycle life and discharge rate performance, especially at low temperatures.
Innovation solutions
Incorporating polymer fibers with an average diameter of 1 nm to 100 nm and inorganic solid particles like Al2O3, TiO2, or phosphate compounds with a NASICON structure into the positive electrode active material-containing layer, which reduces ion conduction resistance and maintains high-speed lithium ion conduction.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If solid electrolytes, nonvolatile electrolytic solutions, or incombustible electrolytic solutions are used to improve safety performance, then safety is improved, but discharge rate performance, low-temperature performance, and long-life performance deteriorate
Why choose this principle:
The patent uses a composite electrolyte system combining solid electrolyte particles (oxide or sulfide with 10^-4 to 10^-2 S/cm conductivity) dispersed in a nonaqueous electrolytic solution. This composite structure provides both safety benefits of solid electrolytes and the high ionic conductivity of liquid electrolytes, resolving the contradiction between safety and discharge rate performance.
Principle concept:
If solid electrolytes, nonvolatile electrolytic solutions, or incombustible electrolytic solutions are used to improve safety performance, then safety is improved, but discharge rate performance, low-temperature performance, and long-life performance deteriorate
Why choose this principle:
The patent changes the physical state parameters of the electrolyte by using a hybrid solid-liquid system. The solid electrolyte particles (0.1 to 10 μm) suspended in the liquid electrolyte create intermediate states that provide both the safety of solids and the performance of liquids, allowing simultaneous improvement of safety and discharge rate characteristics.
Application Domain
Data Source
AI summary:
Incorporating polymer fibers with an average diameter of 1 nm to 100 nm and inorganic solid particles like Al2O3, TiO2, or phosphate compounds with a NASICON structure into the positive electrode active material-containing layer, which reduces ion conduction resistance and maintains high-speed lithium ion conduction.
Abstract
According to one embodiment, there is provided an electrode including active material particles, polymer fibers and inorganic solid particles. The polymer fibers have an average fiber diameter of 1 nm to 100 nm.