Lithium Metal Composite Oxide Surface Oxide Layer for Battery Output
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Solution Overview
Problem
To improve the output characteristic of non-aqueous electrolyte secondary batteries without increasing the positive electrode resistance, which is compromised when trying to decrease the negative electrode resistance by altering the composition ratio of the electrodes.
Innovation Solution
Incorporating an element that forms an alloy with lithium at the surface of the negative electrode active material, represented by the formula LiaNi1-x-y-zCoxDyEzO2, where the element E is selected from Mn, V, Mo, Nb, Ti, and W, and forms an oxide at the surface of the primary and secondary particles, allowing for increased electrochemical reaction field and reduced negative electrode resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If small particle size positive electrode active material is used to decrease positive electrode resistance, then the reacting area increases, but the manufacturing complexity increases
Solution Approach 1:
The invention applies preliminary action by forming the oxide layer containing element E on the surface of the positive electrode active material particles before battery assembly. This pre-treatment ensures that the particles are ready for immediate electrochemical reaction upon battery operation, reducing positive electrode resistance without requiring complex manufacturing processes during battery production.
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
This approach effectively decreases negative electrode resistance without changing the composition ratio of the electrodes, enhancing the battery's output characteristic and maintaining stability and safety.
Implementation Method 1
an element E which forms an alloy with lithium at a surface of a negative electrode active material
Implementation Method 2
electrochemical reaction field of lithium at a surface of the negative electrode increases
Implementation Method 3
by adding an element which elutes in an electrolyte solution when charging and discharging
Implementation Method 4
an oxide containing the element E exists at a surface of at least either of the primary particles and the secondary particles
Data Source
AI summary
A positive electrode active material for a non-aqueous electrolyte secondary battery includes a lithium metal composite oxide, wherein the lithium metal composite oxide is represented by a general formula: LiaNi1-x-y-zCoxDyEzO2 (wherein, in the formula, 0.05≤x≤0.35, 0≤y≤0.35, 0.002≤z≤0.05, 1.00≤a≤1.30, an element D is at least one type of element selected from Mn, V, Mo, Nb, Ti, and W, and an element E is an element forming an alloy with lithium at a potential more noble than a potential in which ions of the element E are reduced), wherein the lithium metal composite oxide includes primary and secondary particles formed by aggregating the primary particles, wherein an oxide containing the element E exists at a surface of at least either of the primary and secondary particles.