This review discusses dry electrode processing technology and binders for lithium-ion batteries (LIBs). As a popular energy storage device, LIBs have advantages such as high energy density and long cycle life. However, the increasing demand for energy storage materials has led to new challenges in battery industrialization, including improving efficiency, reducing energy consumption, and enhancing battery performance. The electrode processing process plays a crucial role in advancing LIB technology and significantly impacts battery energy density, manufacturing cost, and yield. Dry electrode technology, which eliminates solvents, has attracted attention due to its unique advantages and compatibility. This paper provides an overview of various dry electrode technologies, discusses the latest advancements in commonly used binders for different dry processes, and offers insights into future electrode manufacturing.
Dry electrode processing methods include dry spraying deposition, melt extrusion, 3D printing, powder compression, and polymer fibrillation. Each method has unique characteristics, but the overall process is similar, involving three steps: dry mixing, dry coating, and pressing into the final electrode. Dry spraying deposition is a typical method for preparing electrodes, involving the mixing of active materials, conductive agents, and binders, followed by deposition onto a metal collector and hot pressing to form a thin, dense electrode. Melt extrusion involves pre-mixing active materials, conductive agents, and binders, followed by extrusion, molding, and binder removal to create self-supporting films. 3D printing uses additive manufacturing techniques to create electrodes with precise shapes and thicknesses. Powder compression directly presses dry battery material powder into electrodes without binder. Polymer fibrillation involves fibrillating polymer binders to create a stable electrode active layer.
Polymer binders such as PTFE and PVDF are commonly used in dry electrode technology. PTFE is favored for its high thermal stability, solvent resistance, and low coefficient of friction. However, PTFE can be unstable in anode environments, leading to side reactions. To address this, strategies such as coating graphite particles with PEO or P(VDF-TrFE-CFE) have been proposed to block side reactions and improve anode stability. The review highlights the potential of dry electrode technology in improving battery performance, reducing costs, and enhancing sustainability.This review discusses dry electrode processing technology and binders for lithium-ion batteries (LIBs). As a popular energy storage device, LIBs have advantages such as high energy density and long cycle life. However, the increasing demand for energy storage materials has led to new challenges in battery industrialization, including improving efficiency, reducing energy consumption, and enhancing battery performance. The electrode processing process plays a crucial role in advancing LIB technology and significantly impacts battery energy density, manufacturing cost, and yield. Dry electrode technology, which eliminates solvents, has attracted attention due to its unique advantages and compatibility. This paper provides an overview of various dry electrode technologies, discusses the latest advancements in commonly used binders for different dry processes, and offers insights into future electrode manufacturing.
Dry electrode processing methods include dry spraying deposition, melt extrusion, 3D printing, powder compression, and polymer fibrillation. Each method has unique characteristics, but the overall process is similar, involving three steps: dry mixing, dry coating, and pressing into the final electrode. Dry spraying deposition is a typical method for preparing electrodes, involving the mixing of active materials, conductive agents, and binders, followed by deposition onto a metal collector and hot pressing to form a thin, dense electrode. Melt extrusion involves pre-mixing active materials, conductive agents, and binders, followed by extrusion, molding, and binder removal to create self-supporting films. 3D printing uses additive manufacturing techniques to create electrodes with precise shapes and thicknesses. Powder compression directly presses dry battery material powder into electrodes without binder. Polymer fibrillation involves fibrillating polymer binders to create a stable electrode active layer.
Polymer binders such as PTFE and PVDF are commonly used in dry electrode technology. PTFE is favored for its high thermal stability, solvent resistance, and low coefficient of friction. However, PTFE can be unstable in anode environments, leading to side reactions. To address this, strategies such as coating graphite particles with PEO or P(VDF-TrFE-CFE) have been proposed to block side reactions and improve anode stability. The review highlights the potential of dry electrode technology in improving battery performance, reducing costs, and enhancing sustainability.