Li-Ion Battery Electrode Matching for Cycle Life and Energy Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in improving the cycle performance and energy density of lithium-ion secondary batteries for new energy vehicles is that existing methods require extensive research and resource allocation, leading to prolonged development cycles and increased costs, making it difficult to meet the growing market demand.
Innovation Solution
The use of lithium nickel cobalt manganese oxides and lithium nickel cobalt aluminium oxides as positive electrode active materials, combined with silicon-based and carbon materials in the negative electrode, with a performance parameter K between 1.05 and 1.25, to optimize the matching of positive and negative electrodes, enhancing lithium ion and electron conductivity, and adjusting parameters like prelithiation and capacity excess coefficients to improve energy density and cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extensive research and resource allocation are used to improve cycle performance and energy density, then battery performance is improved, but development time and costs increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the performance parameter K within the range of 1.05-1.25, which represents the ratio of negative electrode capacity to positive electrode capacity. This specific parameter range enables the battery to achieve high cycle performance (retaining 80% capacity after 500 cycles at 45°C) and high energy density (4.32 Wh/g) simultaneously, resolving the contradiction between performance improvement and development time extension
Solution Approach 2:
The patent uses composite materials in the negative electrode by combining silicon-based materials (providing high capacity) with carbon materials (providing stability and conductivity). This composite structure achieves both high energy density and long cycle life, as the carbon matrix constrains silicon expansion while maintaining electrical conductivity, thereby improving performance without requiring extensive additional research
2Reliability
If extensive research and resource allocation are used to improve cycle performance and energy density, then battery performance is improved, but development costs increase
Solution Approach 1:
The patent establishes a clear parameter specification (K=1.05-1.25) that guides manufacturing and quality control. By defining this specific performance parameter range based on capacity ratios, the patent enables cost-effective production through standardized manufacturing processes rather than requiring expensive iterative research and development
Solution Approach 2:
The patent applies local quality by optimizing specific components (negative electrode materials with silicon-carbon composite) to achieve overall battery performance improvement. This targeted optimization approach reduces development costs compared to redesigning the entire battery system, as only specific materials and their ratios need to be precisely controlled
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 results in secondary batteries with higher energy density, cycle performance, storage performance, and dynamic performance, extending cycle life and storage life while reducing development time and costs.
Implementation Method 1
a lithium ion secondary battery comprising a positive electrode plate, a negative electrode plate, a separator and an electrolyte
Implementation Method 2
the positive electrode film arranged on at least one surface of the positive electrode current collector and comprising a positive electrode active material
Data Source
Figure 1~3
Figure 4~6
AI summary
The present application discloses a secondary battery and a battery module, a battery pack and an apparatus containing the secondary battery. The secondary battery comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte; the positive electrode plate comprising a positive electrode current collector and a positive electrode film disposed on at least one surface of the positive electrode current collector and comprising a positive electrode active material; the negative electrode plate comprising a negative electrode current collector and a negative electrode film disposed on at least one surface of the negative electrode current collector and comprising a negative electrode active material; wherein the positive electrode active material comprises one or more of lithium nickel cobalt manganese oxides and lithium nickel cobalt aluminium oxides; the negative electrode active material comprises a silicon-based material and a carbon material; and the secondary battery satisfies: 1.05≤K≤1.25.