Dual-Layer Graphite Anode for Fast-Charging High-Energy Batteries
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Solution Overview
Problem
Secondary batteries face a challenge in achieving both high energy density and quick charging performance, as high energy density designs often compromise quick charging capabilities.
Innovation Solution
A secondary battery design featuring a negative electrode plate with a first film comprising graphite and a second film made of artificial graphite, both with specific particle size uniformities, optimized to enhance ion transmission and contact surfaces, thereby improving quick charging and cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the secondary battery is designed for high energy density, then the energy storage capacity is improved, but the quick charging performance deteriorates
Solution Approach 1:
The negative electrode film is divided into two distinct layers: a first negative electrode film containing graphite particles with 0.4-0.6 uniformity and a second negative electrode film containing artificial graphite particles with 0.25-0.45 uniformity. This segmentation allows each layer to serve different functions - the first layer provides high energy density while the second layer facilitates rapid ion transport, thereby resolving the contradiction between energy density and quick charging performance
Solution Approach 2:
Different regions of the negative electrode are assigned different material properties through the two-layer structure. The first negative electrode film uses graphite with specific particle size uniformity (0.4-0.6) optimized for capacity, while the second negative electrode film uses artificial graphite with different uniformity (0.25-0.45) optimized for fast charging. This local differentiation enables simultaneous achievement of high energy density and quick charging capability
Data Source
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AI summary
This application relates to a secondary battery (5), a process for preparing the same and an apparatus containing the secondary battery (5). In particular, the negative electrode plate (10) comprises a negative current collector (101) and a negative electrode film, wherein the negative electrode film comprises a first negative electrode film (103) and a second negative electrode film (102), the first negative electrode film (103) is disposed on at least one surface of the negative current collector (101) and comprises a first negative electrode active material, the first negative electrode active material comprises graphite, and the particle size uniformity of the first negative electrode active material is from 0.4 to 0.6; the second negative electrode film (102) is disposed on the first negative electrode film (103) and comprises a second negative electrode active material, the second negative electrode active material comprises artificial graphite, and the particle size uniformity of the second negative electrode active material is from 0.25 to 0.45. Secondary battery (5) has high energy density and good quick charging performance and cycle performance.