Secondary Battery Active Material Thermal Stability
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Solution Overview
Problem
Current secondary batteries face limitations in achieving superior battery characteristics such as high energy density, long life, and thermal stability, particularly in electronic devices and electric vehicles, where size, weight, and performance are critical.
Innovation Solution
A secondary battery active material comprising a cathode with a main phase and a sub-phase, specifically a lithium compound (LiaNibMcAldOe) and a second lithium compound containing lithium, aluminum, and oxygen, which improves thermal stability and energy density by forming a solid solution, enhancing the battery's charge-discharge cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a lithium-containing composite oxide (Li1+yMO2) is used to improve charge-discharge cycle characteristics, then cycle life is improved, but thermal stability deteriorates
Solution Approach 1:
The patent employs a composite oxide material with a specific multi-element composition (Li, Ni, Co, Al, Mn, O) where different elements serve complementary functions. Nickel provides high capacity, cobalt enhances stability, aluminum and manganese improve thermal stability, creating a synergistic composite that resolves the contradiction between cycle life and thermal stability
Solution Approach 2:
The patent precisely controls stoichiometric parameters (x, y, z, w) in the formula LixNiyCozAlwO2 to optimize performance. By adjusting these compositional parameters within specific ranges, the material achieves both improved cycle characteristics and enhanced thermal stability simultaneously
2Object-generated harmful factors
If a complex of lithium-aluminum oxide and lithium-nickel oxide is used to suppress gas generation, then gas generation is suppressed, but energy density deteriorates
Solution Approach 1:
The patent optimizes the lithium content parameter (x) in the formula LixNiyCozAlwO2 to achieve a balance where sufficient lithium is present to maintain high energy density while the aluminum content (w) is controlled to suppress gas generation during charging without excessive compromise to capacity
3Reliability
If a lithium transition metal composite oxide (LiNixCoyAlzO2) is used to suppress increase in internal resistance, then internal resistance stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies optimal ranges for the transition metal content parameters (y for nickel, z for cobalt, w for aluminum) to achieve internal resistance stability. By defining specific compositional windows, the patent makes the manufacturing process more controllable and less complex while maintaining reliable 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 proposed active material configuration enhances thermal stability and energy density, leading to improved battery performance and longer cycle life, suitable for electronic devices and electric vehicles.
Implementation Method 1
specifically a lithium compound (LiaNibMcAldOe) and a second lithium compound containing lithium, aluminum, and oxygen, which improves thermal stability and energy density by forming a solid solution
Implementation Method 2
The electrode includes an active material participating in charge-discharge reaction
Data Source
AI summary
The present invention provides a secondary battery-use active material that allows for an improvement in thermal stability after charge and discharge are repeated. The secondary battery-use active material of the present invention includes a cathode active material that includes (A) a main phase and a sub-phase, (B) the main phase containing a first lithium compound represented by LiaNibMcAldOe (where M is an element such as cobalt, and 0.8<a<1.2, 0.45≤b≤1, 0≤c≤1, 0≤d≤0.2, 0<e≤1.98, (c+d)>0, and (b+c+d)≤1), and (C) the sub-phase containing a second lithium compound that contains lithium, aluminum, and oxygen as constituent elements.