锂离子电池极片辊压异质微结构演化与性能相关性研究进展
Research progress of heterogeneous microstructure and performance correlation during calendering process of electrode for LIBs
张俊鹏 1孙静娜 2黄华贵 2苑振革3
作者信息
- 1. 安徽建筑大学 机械与电气工程学院,合肥 230601;燕山大学 国家冷轧板带装备及工艺工程技术研究中心,秦皇岛 066004
- 2. 燕山大学 国家冷轧板带装备及工艺工程技术研究中心,秦皇岛 066004
- 3. 邢台纳科诺尔精轧科技股份有限公司,邢台 054000
- 折叠
摘要
在力争实现"碳达峰、碳中和"的"双碳"战略目标背景下,电池储能技术已成为我国汽车产业转型和经济可持续增长的重要发展方向.极片作为锂离子电池(LIB)的核心部件,决定了电池能量密度和服役安全性,而辊压工序是确保极片达到所需压实密度、提高电池综合性能的关键.然而,由于极片为"涂层-集流体-涂层"的典型层状复合结构,具有异质性特征,其中涂层为多孔可压缩结构,在辊压时涉及活性颗粒间和颗粒-集流体间的相互作用,因此,辊压变形机理极为复杂,厚度控制难度大,对后续性能表现影响显著.本文概述了极片辊压工艺基础理论、基本机理及性能的研究进展,有助于深入理解正负极片辊压-微结构-性能表现之间的相关性,为预测极片正向性能、设计极片反向工艺与微结构、完善辊压工艺设定和提高极片产品质量提供指导.
Abstract
In the context of striving to achieve the"dual-carbon"strategy goal of"carbon peak and carbon neutrality",battery energy storage technology has become an important direction for China's automotive industry transformation and sustainable economic growth.As the core component of the battery,the electrode determines the energy density and service safety of the battery,and the calendering process is a key factor in ensuring the required compaction density of the electrode and improving the comprehensive performance of the battery.However,due to the typical layered composite structure of the electrode,which consists of a coating-collector-coating structure with porous and compressible properties and involves the interaction between active particles and particle-current collector,it has haterogeneous characteristics.The deformation mechanism during the calendering process is extremely complex,and controlling the thickness is difficult,which significantly affects subsequent performance.This article provides an overview of the research progress on the fundamental theories,basic mechanisms,and performance of the calendering process for electrode.It contributes to a deeper understanding of the correlation between the calendering-microstructure-performance of anode and cathode electrode,offering guidance for predicting the forward performance of electrode,designing reverse process and microstructure,optimizing calendering process settings and improving the quality of electrode products.
关键词
电池极片/辊压/微结构/性能/工艺建模Key words
lithium-ion battery electrode/calendering process/microstructure/performance/modeling引用本文复制引用
基金项目
安徽省高校启动基金资助项目(2023QDZ37)
河北省科技重大专项项目(23281901Z)
河北省重点研发计划资助项目(20314402D)
出版年
2024
NETL
NSTL
万方数据