From Metals to Polymers: Material Evolution and Functional Advancements in Current Collectors

Area of Science:

• Materials Science and Engineering
• Electrochemistry
• Energy Storage Technologies

Background:

• Rechargeable batteries face critical limitations including insufficient energy density, restricted design flexibility, and safety concerns.
• Current collectors, though vital, are often overlooked components influencing battery performance and safety.
• Existing metal foil collectors present challenges such as corrosion and high volumetric density.

Purpose of the Study:

• To review and analyze the role of current collectors in addressing limitations in rechargeable battery technology.
• To systematically examine recent advancements in four main types of current collectors.
• To outline future directions for current collector development to enable next-generation energy storage.

Main Methods:

• Systematic analysis of recent progress in current collectors derived from metal foils, carbonaceous substrates, conductive polymers, and organic-inorganic hybrids.
• Evaluation of the advantages and limitations of each current collector type regarding performance, design, and production.
• Identification of key trends and future research avenues in current collector materials and design.

Main Results:

• Metal foils, while common, exhibit susceptibility to corrosion and high volumetric density.
• Carbonaceous and polymer-based collectors offer lightweight and flexible designs but have conductivity and scalability issues.
• Organic-inorganic hybrid collectors demonstrate significant potential for enhancing battery safety and intelligence through material engineering.

Conclusions:

• Current collectors are critical for advancing rechargeable battery technology beyond current limitations.
• Organic-inorganic hybrid collectors represent a promising frontier for developing safer and more intelligent batteries.
• Future research should focus on enhancing battery performance, multiscale structural adaptability, and integrated multifunctional designs for current collectors.