battery
Solution Overview
Problem
Lithium-ion batteries face safety hazards due to poor high-temperature safety performance, leading to potential fires or explosions from deformation and warping of the termination tape at extreme conditions.
Innovation Solution
A battery design with a termination tape on the positive electrode plate, featuring a specific area-to-width ratio and a cross-linked (meth)acrylic acid adhesive layer, combined with a non-aqueous electrolyte solution containing a high concentration of lithium salt and additives like 1,2-bis(cyanoethoxy)ethane or 1,2,3-tris(2-cyanoethoxy)propane, to enhance thermal stability and prevent short-circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional termination tape and electrolyte are used, then battery assembly is simple, but high-temperature safety performance deteriorates due to deformation and warping
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing specific additives (1,2-bis(cyanoethoxy)ethane and/or 1,2,3-tris(2-cyanoethoxy)propane) at controlled concentrations (0.1-5% and 0.01-1% by weight respectively). These parameter changes enhance the electrolyte's ability to form stable protective films on electrode surfaces at high temperatures, preventing deformation and warping of the termination tape while maintaining reasonable battery structure
Solution Approach 2:
The patent creates a composite electrolyte system by combining conventional electrolyte components (lithium salt, cyclic carbonate, chain carbonate) with specially selected additive compounds. This composite approach produces synergistic effects where the additives work with the base electrolyte to form robust protective layers that maintain battery structural integrity at elevated temperatures without significantly complicating the overall battery design
2Reliability
If termination tape area is increased to prevent short-circuits, then safety improves, but battery volume and energy density deteriorate
Solution Approach 1:
The patent optimizes the area ratio parameter of the termination tape to fall within 10-30% of the positive electrode plate area. This parameter optimization, combined with the enhanced electrolyte formulation, provides adequate short-circuit prevention coverage while minimizing the volume consumed by non-active components, thereby preserving energy density
3Reliability
If lithium salt concentration is increased to improve ionic conductivity, then electrical performance improves, but thermal stability deteriorates due to decomposition
Solution Approach 1:
The patent formulates a composite electrolyte containing lithium salt at 0.5-2.0 mol/L concentration combined with specific additive compounds (1,2-bis(cyanoethoxy)ethane and/or 1,2,3-tris(2-cyanoethoxy)propane). The additives create protective films that stabilize the electrolyte against thermal decomposition while preserving ionic conductivity, achieving both thermal stability and electrical performance through material composition optimization
Solution Approach 2:
The patent optimizes multiple electrolyte parameters simultaneously: lithium salt concentration (0.5-2.0 mol/L), additive concentration ratios, and solvent composition. These coordinated parameter changes ensure that the electrolyte maintains high ionic conductivity for efficient energy transfer while achieving superior thermal stability through the formation of stable protective layers on electrode surfaces
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 solution effectively reduces the risk of short-circuits and improves high-temperature performance by stabilizing the adhesive layer and electrolyte solution, preventing lithium deposition and maintaining battery integrity under high-temperature conditions.
Implementation Method 1
a (meth)acrylic acid termination adhesive layer coated on a surface of the substrate
Implementation Method 2
The non-aqueous electrolyte solution includes a non-aqueous organic solvent, a lithium salt, and an electrolyte additive
Implementation Method 3
1,2-bis(cyanoethoxy)ethane and/or 1,2,3-tris(2-cyanoethoxy)propane
Data Source
AI summary
Disclosed is a battery. The battery includes a positive electrode plate, a negative electrode plate, a non-aqueous electrolyte solution, and a separator. An electrolyte additive includes 1,2-bis(cyanoethoxy)ethane and/or 1,2,3-tris(2-cyanoethoxy)propane. A termination tape of the positive electrode plate is disposed at a paste coating tail of the positive electrode plate. An area of a termination tape of the positive electrode plate is A cm2; a content of 1,2-bis(cyanoethoxy)ethane and/or 1,2,3-tris(2-cyanoethoxy)propane is B56 wt %; and a width of the positive electrode plate is C cm; wherein a ratio of A to B56 is in a range of 2-40 and a ratio of A to C is in a range of 1 to 3. The termination tape includes a substrate and a (meth)acrylic acid termination adhesive layer coated on a surface of the substrate. The battery can effectively improve high-temperature performance.