Lithium Manganese Oxide Cathode Additives for Longer Battery Storage Life
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Solution Overview
Problem
Lithium manganate batteries face challenges in achieving both high energy density and long storage life due to the serious dissolution of manganese, which leads to poor storage life and cannot meet consumer needs.
Innovation Solution
The development of a lithium-ion battery with a positive electrode sheet containing lithium manganese oxide, where trivalent and tetravalent manganese elements coexist, and a high-oxidizability additive is used to oxidize Mn 2+ to Mn 3+ and/or Mn 4+, along with an electrolytic solution with specific components to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium manganate is used as positive electrode material to achieve high energy density, then the energy density is improved, but the storage life deteriorates due to serious manganese dissolution
Solution Approach 1:
The patent changes the chemical composition parameters of the lithium manganate material by introducing dual doping elements (Ni and Fe) to modify the crystal structure and electronic properties, thereby reducing manganese dissolution while maintaining high energy density
Solution Approach 2:
The patent creates a composite material system by doping Ni and Fe elements into the lithium manganate structure, forming a multi-element composite that combines the high capacity of lithium manganate with the structural stability provided by the dopant elements
2Quantity of substance
If the content of trivalent manganese is increased to improve capacity, then the specific capacity is improved, but the storage life deteriorates due to increased manganese dissolution
Solution Approach 1:
The patent optimizes the valence state distribution parameter by controlling the ratio of trivalent to tetravalent manganese and introducing dopant elements, achieving a balanced composition that provides high capacity while minimizing dissolution through enhanced structural 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
This approach significantly reduces the deposition of manganese on the negative electrode, enhancing both the energy density and storage life of the lithium-ion battery without compromising power performance.
Implementation Method 1
a high-oxidizability additive, and the high-oxidizability additive being used to oxidize Mn 2+
Implementation Method 2
an electrolytic solution, where the electrolytic solution includes a low-impedance additive
Data Source
Figure 1~3
Figure 4~6
AI summary
The present application provides a positive electrode sheet including: a current collector and a positive film layer provided on at least one surface of the current collector, the positive film layer including a lithium manganese oxide in which a trivalent manganese element and a tetravalent manganese element coexist and a high-oxidizability additive, and the high-oxidizability additive being used to oxidize Mn2+ to Mn3+ and/or Mn4+. A deposition amount of transition metal manganese on a surface of a negative electrode of a lithium-ion battery is significantly reduced, energy density and storage life of the lithium-ion battery are significantly increased, and there is no loss of power performance of the battery due to the increase of the energy density and a storage life according to the technical solutions of the present application.