Low-Co Nonaqueous Battery Cathode With Fluorosulfonic Electrolyte
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Solution Overview
Problem
The increasing cost of Co in lithium-transition metal composite oxides for non-aqueous electrolyte secondary batteries leads to cost advantages but results in deteriorated cycle characteristics due to unstable lattice structures and side reactions.
Innovation Solution
A non-aqueous electrolyte secondary battery design featuring a positive electrode with a lithium-transition metal composite oxide containing Ni, Mn, and Al, with a Co content of 1.5 atm% or less, and a non-aqueous electrolyte including a fluorosulfonic acid salt to stabilize the crystal structure and suppress metal leaching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If Co content in lithium-transition metal composite oxide is reduced to lower cost, then manufacturing cost is reduced, but cycle characteristics deteriorate due to unstable lattice structure
Solution Approach 1:
The invention changes the chemical composition parameters of the composite oxide by precisely controlling the content ratios of Ni, Mn, Al, and Co atoms. By adjusting these parameters within specific ranges (Ni: 50-70 at%, Mn: 10-30 at%, Al: 10-30 at%, Co: 0-1.5 at%), the lattice structure stability is maintained even with reduced Co content, thereby improving cycle characteristics while controlling manufacturing cost
Solution Approach 2:
The invention uses a composite material approach by combining multiple transition metal elements (Ni, Mn, Al, and limited Co) to form a lithium-transition metal composite oxide. This composite structure leverages the complementary properties of each element: Ni provides high capacity, Mn and Al stabilize the lattice structure, and trace Co enhances overall performance, achieving both cost reduction and reliability improvement
2Ease of manufacture
If Co content is reduced to improve cost efficiency, then material cost decreases, but side reactions increase accelerating deterioration
Solution Approach 1:
The invention changes the compositional parameters to achieve a balanced ratio where Ni, Mn, and Al atoms work synergistically. This parameter optimization creates a more stable surface chemistry environment that reduces unwanted side reactions between the electrode material and electrolyte, thereby slowing deterioration while maintaining cost efficiency through reduced Co content
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 configuration ensures excellent cycle characteristics and reduces internal resistance, maintaining battery performance and durability even with reduced Co content.
Implementation Method 1
a non-aqueous electrolyte including a fluorosulfonic acid salt to stabilize the crystal structure and suppress metal leaching
Data Source
AI summary
A non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, and a non-aqueous electrolyte, in which the positive electrode includes a positive electrode active material, the positive electrode active material includes a lithium-transition metal composite oxide containing Ni, Mn, and Al, proportions of Ni, Mn, and Al in metal elements other than Li contained in the lithium-transition metal composite oxide are, respectively, Ni: 50 atm % or more, Mn: 10 atm % or less, and Al: 10 atm % or less, when the lithium-transition metal composite oxide contains Co, a content of Co in the metal elements other than Li is 1.5 atm % or less, and the non-aqueous electrolyte includes a fluorosulfonic acid salt.