Lithium Replenishment Layer Surface Ratio for Conductive Electrodes
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Solution Overview
Problem
Existing lithium secondary batteries face issues with poor conductivity in their lithium replenishment layers, affecting rate performance and cycle life due to irreversible lithium loss.
Innovation Solution
A lithium replenishment layer comprising a lithium replenishment agent and a conductive agent, with a controlled surface area ratio of (0.5-5):1, forms a conductive network to enhance conductivity and mechanical strength, preventing separation during charging and discharging cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate lithium replenishment layer is arranged on an electrode, then the lithium replenishment effect is optimized, but the conductivity of the lithium replenishment layer becomes poor
Solution Approach 1:
The patent applies composite materials by combining lithium replenishment agents with conductive agents in a specific surface area ratio range of (0.5-5):1. This composite structure allows the lithium replenishment layer to simultaneously achieve good lithium replenishment effect and satisfactory conductivity, resolving the contradiction between these two properties that cannot be achieved with pure lithium replenishment agents alone.
2Reliability
If the lithium replenishment layer has high lithium replenishment agent content, then the lithium replenishment effect is improved, but the mechanical strength and uniformity of the layer deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the surface area ratio of conductive agent to lithium replenishment agent within the specific range of (0.5-5):1. This parameter optimization ensures that the lithium replenishment layer maintains good uniformity and mechanical strength while achieving effective lithium replenishment, preventing layer separation during battery cycling.
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 solution improves the energy density, rate performance, and cycle life of the battery by providing additional active lithium ions and ensuring the lithium replenishment layer remains intact, thus extending battery life and enhancing fast charging capabilities.
Implementation Method 1
a conductive network can be established in the lithium replenishment layer, to increase the electronic conductivity of the lithium replenishment layer
Implementation Method 2
A lithium replenishment agent can release active lithium ions during the first charging process of the battery, to compensate the irreversible lithium loss of the battery
Data Source
AI summary
The present disclosure provides an electrode, a secondary battery, and an electric device. The electrode comprises a lithium replenishment layer. The lithium replenishment layer comprises a lithium replenishment agent and a conductive agent, and the ratio of the total surface area of the conductive agent in the lithium replenishment layer to the total surface area of the lithium replenishment agent in the lithium replenishment layer is (0.5-5):1. The ratio of the surface areas of the lithium replenishment agent and the conductive agent in the lithium replenishment layer meet a certain condition, such that the lithium replenishment layer not only achieves a good lithium replenishment effect, but also has good conductivity.