Cathode Material Coating With Sulfide Electrolyte for Solid-State Contact
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Solution Overview
Problem
Conventional liquid electrolyte-based lithium-ion batteries face safety issues due to flammability and leakage, and solid-state electrolytes suffer from poor contact performance leading to reduced energy density and increased internal resistance.
Innovation Solution
A manufacturing method involving the use of a sulfide solid-state electrolyte coated on the surface of the positive electrode active material using an organic solvent, with controlled particle sizes and proportions to enhance ion transport and reduce volume expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid electrolyte is used in lithium-ion batteries, then ion conduction between electrodes is achieved, but safety performance deteriorates due to flammability and leakage
Solution Approach 1:
The patent changes the physical state parameter of the electrolyte from liquid to solid by using sulfide solid-state electrolyte materials (such as Li6PS5Cl, Li10GeP2S12). This phase transition eliminates the harmful properties of liquid electrolytes including flammability, leakage, and low flash point, while maintaining high ionic conductivity through the solid state material's crystal structure
Solution Approach 2:
The patent employs composite material structures by combining sulfide solid-state electrolyte with positive electrode active material particles. The solid electrolyte forms a coating or composite structure with the electrode material, creating a composite positive electrode that integrates both structural support and ionic conduction functions in a single component
2Reliability
If solid-state electrolyte is used to improve safety, then contact performance deteriorates leading to reduced energy density
Solution Approach 1:
The patent segments the solid electrolyte into fine particles with controlled size distribution (D50 between 100 nm and 30 μm). This segmentation increases the total surface area of the solid electrolyte, improving contact with electrode particles and reducing the volume fraction needed to achieve effective ionic conduction pathways
Solution Approach 2:
The patent applies local quality optimization by controlling the particle size and morphology of the solid electrolyte to achieve optimal contact at the local interface with electrode particles. The sulfide solid electrolyte forms localized high-conductivity pathways at particle contact points, ensuring efficient ion transport without requiring bulk solid electrolyte infiltration
3Reliability
If solid-state electrolyte is coated on positive electrode material, then ion transport is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the solid electrolyte coating process with the electrode manufacturing process itself. The sulfide solid electrolyte particles are mixed with positive electrode active material particles in a controlled atmosphere, and the coating forms during normal electrode fabrication steps without requiring separate coating equipment or additional processing stages
Solution Approach 2:
The solid electrolyte particles self-assemble and coat the electrode material particles through simple mixing and mild heating treatment. The process relies on the inherent properties of the sulfide solid electrolyte (such as surface energy and particle morphology) to automatically form the desired coating structure without requiring external intervention or complex control mechanisms
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 method improves ion intercalation and deintercalation rates, increases energy density, and enhances cycle and rate performance while maintaining safety, with a simpler and cost-effective manufacturing process.
Implementation Method 1
forming a solution by dissolving a sulfide solid-state electrolyte in an organic solvent
Implementation Method 2
by drying the solution, obtaining a battery positive electrode material in which the positive electrode active material is coated with the sulfide solid-state electrolyte
Data Source
AI summary
The present application discloses a manufacturing method for a battery positive electrode material, a battery positive electrode, and an all-solid-state battery. The manufacturing method for a battery positive electrode material includes: forming a solution by dissolving a sulfide solid-state electrolyte in an organic solvent; dispersing a positive electrode active material into the solution, then carrying out drying treatment, to obtain a battery positive electrode material in which the positive electrode active material is coated with the sulfide solid-state electrolyte. The manufacturing method of the present application can increase the contact area between the solid-state electrolyte and the positive electrode active material, effectively solves the problem of small interfacial contact area between conventional solid-state electrolyte and positive electrode active material. Thus, the capability of ions to rapidly intercalate into or deintercalate out of positive electrode active material is enhanced, and the transport of ions and utilization of capacity are facilitated.