Micro-Sized Secondary Particles Solid-State Electrolyte Coating
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Solution Overview
Problem
Traditional micro-sized secondary particles used in lithium-ion batteries exhibit poor bulk ionic conductivity in solid-state batteries due to the lack of a flowing and penetrating Li+ conductive agent, which is not sufficient for high power, energy density, and thermal tolerance requirements.
Innovation Solution
The development of micro-sized secondary particles with enhanced ionic conductivity, comprising a primary particle at least partially coated with a solid-state electrolyte, such as Garnet, LISICON, or Perovskite types, and an electronic conductive additive, with a tap density greater than 0.5 g/cm3, integrated into an electrolytic layer on a current collector, to improve ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional micro-sized secondary particles are used in solid-state batteries, then processing and energy density are improved, but bulk ionic conductivity deteriorates due to lack of Li+ conductive agent
Solution Approach 1:
A solid-state electrolyte coating is introduced as an intermediary layer between the primary electrode particles and the bulk electrolyte. This coating layer acts as a mediator that provides Li+ conduction pathways within the secondary particle structure, enabling ionic transport without requiring a liquid electrolyte or traditional slurry processing method.
Solution Approach 2:
The secondary particle is designed as a composite structure consisting of primary electrode particles embedded in a solid-state electrolyte matrix. This composite architecture combines the high surface area of primary particles with the ionic conductivity of the solid-state electrolyte, achieving both good processing characteristics and enhanced bulk ionic conductivity.
2Reliability
If solid-state electrolyte coating is applied to primary particles, then ionic conductivity is improved, but manufacturing complexity increases
Solution Approach 1:
The electrode formation process and solid-state electrolyte coating process are merged into a single integrated step. The solid-state electrolyte is incorporated directly into the electrode slurry mixture before coating onto the current collector, eliminating the need for separate coating and firing steps required by traditional methods.
Solution Approach 2:
The manufacturing process utilizes parameter changes in the form of a simple slurry mixing ratio adjustment. By controlling the proportion of solid-state electrolyte powder in the slurry mixture, the desired coating thickness and ionic conductivity are achieved through a single-pass coating process without complex multi-step procedures.
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 enhanced micro-sized secondary particles significantly improve ionic conductivity, enabling solid-state batteries to achieve higher power and energy density while maintaining thermal tolerance, making them suitable for next-generation energy storage devices.
Implementation Method 1
lithium ions move from the negative electrode to the positive electrode during discharge via the solid electrolyte which can conduct lithium ions through vacancies in the electrolyte crystal lattice
Data Source
AI summary
An electrode including micro-sized secondary particle (MSSP) with enhanced ionic conductivity for solid-state battery is provided. The MSSP comprises a cathode particle and a solid-state electrolyte. The cathode particle is at least partially coated by solid-state electrolyte. The lithium ion transport inside the micro-sized secondary particles is increased by the incorporation of solid-state electrolyte. The electrode can be prepared by casting the slurry comprising MSSP, another electrolyte, binders, and conductive additives on the current collector. The current collector is comprised of a conductive material. The current collector has a first side and a second side. The electrode active material layer is disposed on one of the first and second sides of the current collector.