All-Solid-State Battery High-Temperature Operation
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Solution Overview
Problem
All-solid-state secondary batteries face issues of low capacity and energy density, and significant degradation under high temperature conditions, as seen in existing technologies.
Innovation Solution
A secondary battery design featuring positive and negative electrode plates made of inorganic materials with oxide active materials, each having a thickness of 25 μm or more, and an inorganic solid electrolyte layer, allowing for rapid charge/discharge with high cycle capacity retention when operated at temperatures of 100°C or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode plate thickness is increased to improve capacity and energy density, then the battery capacity increases, but the charge/discharge rate decreases
Solution Approach 1:
The patent changes the operating temperature parameter to 100°C or higher, which fundamentally alters the electrochemical reaction kinetics and ion transport properties of the solid electrolyte. This temperature parameter change enables the battery to achieve both high capacity (26 Qh or more) and high charge/discharge rates (1.0 C or more) simultaneously, resolving the traditional trade-off between capacity and rate performance.
2Quantity of substance
If the electrode plate thickness is increased to improve energy density, then the energy density increases, but the cycle stability under high temperature deteriorates
Solution Approach 1:
The patent operates the battery at elevated temperatures of 100°C or higher, which fundamentally changes the stability characteristics of the solid electrolyte and electrode materials. Under these temperature conditions, the all-solid-state battery achieves both high energy density (4.0 Wh/cm³ or more) and excellent cycle stability (80% or more capacity retention after 100 cycles), simultaneously resolving the contradiction between energy density and cycle stability that plagues conventional designs.
3Reliability
If conventional solid electrolyte compositions are used to ensure safety, then ignition and leakage risks are reduced, but capacity and rate characteristics are limited
Solution Approach 1:
The patent employs composite solid electrolyte materials comprising multiple components (such as Li3PO4, Li2SiO3, and other inorganic compounds) that work synergistically. This composite material approach maintains the inherent safety advantages of solid electrolytes (eliminating liquid electrolyte leakage and ignition risks) while achieving superior rate characteristics (1.0 C or more) and high capacity (26 Qh or more) through the combined effects of different material phases and their interfacial properties.
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 battery achieves a large capacity and high energy density with improved rate characteristics and cycle retention, maintaining performance even after repeated rapid charge/discharge cycles at elevated temperatures.
Implementation Method 1
an inorganic solid electrolyte layer
Implementation Method 2
positive electrode plate composed of an inorganic material comprising a positive electrode active material in an oxide form and having a thickness of 25 μm or more, a negative electrode plate composed of an inorganic material comprising a negative electrode active material in an oxide form
Data Source
AI summary
The present invention provides a secondary battery, including a positive electrode plate composed of an inorganic material including a positive electrode active material in an oxide form and having a thickness of 25 μm or more; a negative electrode plate composed of an inorganic material including a negative electrode active material in an oxide form and having a thickness of 25 μm or more; and an inorganic solid electrolyte layer, wherein the secondary battery is chargeable and dischargeable at a temperature of 100° C. or more. The present invention can provide rapid charge/discharge at a high cycle capacity retention and increase the capacity of the secondary battery.