Lithium Alloy Oxide Positive Electrode Surface Modification
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Solution Overview
Problem
Lithium battery positive electrodes made of lithium alloy oxides typically have uneven and non-dense surfaces with large grains, leading to low capacity and shorter cycle lifetime due to insignificant film or powder processing methods.
Innovation Solution
A method involving the formation of a lithium alloy oxide layer on a substrate followed by a plasma treatment to modify the surface, resulting in uniform, dense, inter-necked nano grains on the top surface and larger grains in the bottom structure, enhancing the electrode's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional film process or powder process is used to form the positive electrode, then the manufacturing process is simple, but the top surface of the lithium alloy oxide becomes uneven and non-dense with large grains, resulting in low capacity and short cycle lifetime
Solution Approach 1:
The patent applies plasma treatment as a preliminary action before electrode assembly to modify the lithium alloy oxide surface. This pre-treatment creates uniform, dense nano-grains on the surface while maintaining larger grains in the bottom structure, solving the surface quality issue before the electrode is assembled into the battery.
Solution Approach 2:
The patent changes the physical and chemical parameters of the lithium alloy oxide surface through plasma treatment. The treatment modifies grain size distribution (creating nano-grains on surface), surface density, and surface uniformity, thereby improving capacity and cycle lifetime without fundamentally changing the manufacturing process flow.
2Reliability
If the positive electrode has large grains on the surface, then the manufacturing process is straightforward, but the capacity and cycle lifetime are reduced
Solution Approach 1:
The patent applies local quality by creating different grain structures in different regions of the lithium alloy oxide layer. The top surface has uniform, dense nano-grains for high capacity and long cycle lifetime, while the bottom structure maintains larger grains. This regional differentiation optimizes performance without complicating the overall manufacturing approach.
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 modified lithium alloy oxide layer achieves higher capacity and longer cycle lifetime, improving the overall performance of lithium batteries by maintaining chemical composition and crystalline type while altering grain size.
Implementation Method 1
processing a plasma treatment to modify the lithium alloy oxide layer
Data Source
AI summary
Disclosed is a positive electrode applied in lithium battery and method for manufacturing the same. First, a lithium alloy oxide layer is formed on a substrate. Subsequently, an additional high density and low energy plasma treatment is processed, such that the lithium alloy oxide layer has a top surface composed of uniform, dense, and inter-necked nano grains, and the in-side/bottom grains of the oxide layer remain unchanged. According to experiments, the positive electrode with such properties has higher capacity and longer cycle lifetime, thereby improving the lithium battery performance.