Electrode Ceramic Coating to Replace Li-Ion Battery Separators
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium-ion batteries face safety hazards due to internal short circuits and limited cycle life, particularly in batteries without tabs, which can lead to thermal runaway and explosion, and the use of organic polymer separator membranes increases internal resistance and leakage current.
Innovation Solution
A method for producing an electrode ceramic coating with specific surface roughness Ra, applied directly on electrodes, replacing the traditional separator membrane, comprising steps of coating a ceramic slurry and drying to form a ceramic coating layer, using materials like boehmite and alumina to enhance safety and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an organic polymer separator membrane is used to isolate electrodes, then safety protection against short circuits is provided, but internal resistance increases and leakage current increases significantly with aging
Solution Approach 1:
The invention changes the material parameter from organic polymer to inorganic ceramic coating, fundamentally altering the physical and chemical properties of the separator. The ceramic coating maintains electrical insulation while providing lower internal resistance and improved stability, directly resolving the contradiction between safety protection and energy loss
Solution Approach 2:
The invention uses composite ceramic materials (such as alumina, silica, boehmite) combined with binders to create a coating that integrates multiple functions: electrical insulation, mechanical strength, and chemical stability. This composite approach allows the separator to maintain safety protection while reducing internal resistance and leakage current
2Reliability
If the separator membrane thickness is increased to improve safety, then protection against short circuits is enhanced, but volumetric specific energy decreases
Solution Approach 1:
The invention changes the material parameters of the separator from organic polymer to inorganic ceramic coating, enabling achieving the same or better safety protection with significantly reduced thickness. The ceramic coating's superior mechanical and thermal properties allow for thinner designs that maintain protection while increasing energy density
Solution Approach 2:
The invention employs a thin film ceramic coating applied directly on the electrode surface, replacing the traditional thick separator membrane. This thin film approach provides adequate electrical insulation and safety protection while minimizing the space occupied, thereby increasing volumetric specific energy
3Reliability
If tabs are added to lithium-ion batteries to prevent short circuits, then safety is improved, but internal impedance increases and structure becomes complex
Solution Approach 1:
The invention extracts and eliminates the tab component from the battery structure by providing electrical insulation directly on the electrode surface through ceramic coating. This removes the need for separate tabs while maintaining safety protection, thereby reducing structural complexity and internal impedance
Solution Approach 2:
The invention merges the functions of the separator and tabs into a single integrated solution: the ceramic coating on the electrode surface provides both electrical insulation (replacing tabs) and short circuit protection (replacing separator). This consolidation simplifies the overall battery structure while maintaining safety
4Reliability
If separator membrane is used in tab-less batteries to prevent thermal runaway, then safety is improved, but internal resistance increases
Solution Approach 1:
The invention changes the material parameters from organic polymer separator to inorganic ceramic coating, which inherently provides better thermal stability and lower electrical resistance. The ceramic coating maintains safety protection against thermal runaway while minimizing internal resistance, making it ideal for tab-less battery designs
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 ceramic coating prevents direct short circuits and improves safety and cycle life, while eliminating the need for a separator membrane, thereby increasing the volumetric specific energy and feasibility of tab-less lithium-ion batteries.
Implementation Method 1
coating a ceramic slurry on an electrode surface to form a coating layer
Implementation Method 2
drying the coating layer to obtain the ceramic coating
Data Source
AI summary
Provided is a method for producing an electrode ceramic coating, comprising the following steps: step 1, coating a ceramic slurry on an electrode surface to form a coating layer; and step 2, drying the coating layer to obtain the ceramic coating. A method for producing a lithium-ion battery is further provided, comprising the following steps: step 1, forming an electrode ceramic coating on at least one of surfaces of a cathode electrode and/or an anode electrode; and step 2, assembling the cathode electrode, the anode electrode, electrolyte and a housing into a battery, wherein the ceramic coating formed in step 1 is provided between the cathode electrode and the anode electrode. The ceramic coating can replace the battery separator membrane in the conventional sense, and can improve the cycle life and the thermal stability of the lithium-ion battery.