Pre-Lithiated Cathode Material Using Spinel Doping for Lithium Loss
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Solution Overview
Problem
Lithium ion batteries face challenges in achieving high energy density and safety performance due to capacity loss during the first charge-discharge process, primarily due to lithium extraction and insertion imbalances, leading to irreversible capacity loss and reduced discharge capacity.
Innovation Solution
A pre-lithiated lithium ion positive electrode material with a chemical formula of Li2O/[A(3-x)Mex]1/3-LiAO2 is developed, where A includes Ni, Co, and Mn, and Me includes various elements, using a method involving a sulfate solution, precipitant, complexing agent, and pre-lithiation treatment to form a spinel phase structure, enhancing lithium diffusion and binding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium is added to the negative electrode to increase discharge capacity, then the first discharge capacity is improved, but the battery compatibility and safety performance are reduced
Solution Approach 1:
Instead of adding lithium to the negative electrode (conventional approach), the patent inverts the approach by adding lithium-containing compounds to the positive electrode material. This reversal allows the lithium to be released in a controlled manner during the first charge process, compensating for lithium loss without causing the safety and compatibility issues associated with lithium-added negative electrodes. The positive electrode modification maintains battery safety while achieving high discharge capacity.
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 pre-lithiated material exhibits improved first discharge capacity, high voltage resistance, long cycle life, and high rate capability, with the spinel phase structure facilitating lithium ion diffusion and increasing energy density while maintaining compatibility with existing battery manufacturing processes.
Implementation Method 1
the spinel phase structure facilitating lithium ion diffusion
Data Source
AI summary
Disclosed are a pre-lithiated lithium ion positive electrode material, a preparation method therefor and use thereof. The lithium ion positive electrode material has a chemical formula of Li2O/[A(3-x)Mex]1/3-LiAO2, wherein A comprises M, and wherein M is at least one of Ni, Co, and Mn; and wherein Me is at least one of Ni, Mn, Al, Mg, Ti, Zr, Y, Mo, W, Na, Ce, Cr, Zn or Fe; and wherein 0<x<0.1. The material is co-doped with multiple elements, and these elements act synergistically to inhibit the irreversible phase change at a high voltage and improve the stability of the structure of a substrate. The spinel phase A(3-x)MexO4 structure contains the doping elements, which work together to improve the interfacial activity of the material and introduce more electrochemically active sites.