Battery Electrolyte Additive Composition for High-Temperature Cycle Stability
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Solution Overview
Problem
Current electrolyte additives in metal ion batteries, such as lithium-ion and sodium-ion batteries, fail to adequately improve performance metrics like rapid charge and discharge, cycle life, and storage stability to meet consumer demands, particularly under high-temperature conditions.
Innovation Solution
An electrolyte additive comprising a first additive with a specific structure and a trinitrile compound as a second additive, along with optional third and fourth additives, forms a complex with transition metal ions like manganese to stabilize the SEI film, reducing ion migration and enhancing cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte additives are used, then basic battery function is maintained, but high-temperature cycle performance and stability are insufficient
Solution Approach 1:
The patent combines a first electrolyte additive (cyclic sulfate ester) with a second electrolyte additive (trinitrile compound) to form a composite additive system. This composite approach creates synergistic effects where the cyclic sulfate ester forms the base SEI film and the trinitrile compound enhances high-temperature stability, resolving the contradiction between maintaining basic function and improving high-temperature cycle performance.
Solution Approach 2:
The patent optimizes the mass ratio of the first additive to the second additive within 0.9-1.1, and controls their individual concentrations (0.1-2% and 0.1-2% respectively). By adjusting these parameters, the electrolyte achieves optimal SEI film formation and stability, improving high-temperature cycle performance while managing the complexity of the additive composition.
2Duration of action of stationary object
If electrolyte additives are increased to improve cycle life, then battery longevity improves, but internal resistance and other performance metrics may be affected
Solution Approach 1:
The patent precisely controls the concentration parameters of both additives (0.1-2% for first additive, 0.1-2% for second additive) and their mass ratio (0.9-1.1). This parameter optimization ensures sufficient SEI film formation for long cycle life while maintaining appropriate ionic conductivity and internal resistance characteristics, resolving the contradiction between cycle life extension and internal resistance stability.
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 synergistic effect of the additives improves high-temperature cycle performance and reduces internal resistance, leading to enhanced battery stability and longevity.
Implementation Method 1
forms a complex with transition metal ions like manganese to stabilize the SEI film
Implementation Method 2
the ionic conductivity of the electrolyte can be improved
Data Source
AI summary
The present disclosure provides an electrolyte additive, an electrolyte, and a battery. The electrolyte additive comprises: a first additive and a second additive. The structure of the first additive is as represented by formula 1, and the second additive comprises a trinitrile substance.