Lithium-Rich Coated Separator for Low-Resistance Secondary Batteries
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Solution Overview
Problem
Existing lithium-ion battery recovery processes are energy-intensive and costly, and discarded batteries pose environmental risks, while traditional separator materials do not adequately address the need for improved kinetic and cycle performance in secondary batteries.
Innovation Solution
A separator comprising a microporous base membrane with a coating of lithium-rich particles, where the average particle size to coating thickness ratio is 1:(1-15), allowing oxidative decomposition to increase porosity and replenish lithium ions, enhancing kinetic and cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pyro/hydrometallurgical methods are used for battery recovery, then key metals can be extracted effectively, but energy consumption is high and the process becomes cumbersome
Solution Approach 1:
The separator contains lithium-rich particles that automatically decompose during battery formation to release lithium ions, replenishing the lithium inventory in recovered electrodes without requiring external lithium sources or complex processing steps
Solution Approach 2:
The invention changes the chemical composition parameter of the separator by incorporating lithium-rich particles, transforming it from a passive insulating component to an active lithium source that dynamically releases lithium ions during battery operation
2Reliability
If a coating with lithium-rich particles is added to the separator, then kinetic performance and cycle performance are improved, but the device complexity increases
Solution Approach 1:
The separator serves multiple functions simultaneously: it acts as an insulating barrier between electrodes, provides a pathway for lithium ion transport through its porous structure, and functions as a lithium source through the decomposable lithium-rich particles in the coating
Solution Approach 2:
The separator is constructed as a composite material system combining a porous base membrane with a coating layer containing lithium-rich particles, achieving synergistic effects that improve both kinetic and cycle performance
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 separator improves safety, reduces internal resistance, and restores lithium content in recovered positive electrode plates, thereby enhancing the performance and cycle life of secondary batteries.
Implementation Method 1
the lithium-rich particles may undergo oxidative decomposition or dissolution, and the vacancies generated by the decomposition increase the porosity of the separator
Data Source
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AI summary
Disclosed in the present application are a separator and a preparation method therefor, an electrode assembly, a secondary battery, a battery module, a battery pack and an electrical apparatus. The separator comprises: a first microporous base membrane, a second microporous base membrane, and a coating disposed between the first microporous base membrane and the second microporous base membrane, wherein the coating comprises lithium-rich particles, and the ratio of the average particle size Dv50 of the lithium-rich particles to the thickness of the coating is 1:(1-15).