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  • Writer's pictureSemco Infratech

Effect of the dry-wet diaphragm on the performance of lithium-ion batteries

Updated: Jul 8, 2023


Lithium-ion batteries have revolutionized the energy storage landscape, powering a wide range of devices from portable electronics to electric vehicles. One critical component within lithium-ion batteries is the diaphragm, which acts as a separator between the positive and negative electrodes, preventing short circuits and facilitating the movement of lithium ions during charge and discharge cycles. The dry-wet diaphragm, a recent innovation in lithium-ion battery technology, has shown promising advancements in terms of performance and safety. This article explores the effect of dry-wet diaphragms on the performance of lithium-ion batteries.

Enhanced Ion Transport:

Performance Of Lithium-ion Batteries

Dry-wet diaphragms exhibit improved ion transport characteristics compared to conventional dry diaphragms. The addition of a small amount of electrolyte to the diaphragm creates a moist environment, which facilitates the movement of lithium ions between the electrodes. This enhanced ion transport leads to lower internal resistance and improved battery efficiency, resulting in higher charge/discharge rates and overall performance.

Suppression of Dendrite Formation:

Dendrite formation is a significant concern in lithium-ion batteries as it can lead to internal short circuits and potentially cause battery failure or even safety hazards. Dry-wet diaphragms help suppress dendrite formation by maintaining a controlled moisture level within the battery. The presence of a wet environment promotes uniform lithium-ion diffusion, preventing the formation of dendrites and improving the battery's lifespan and safety.

Thermal Management:

One critical factor affecting lithium-ion battery performance and safety is temperature management. Dry-wet diaphragms can aid in thermal regulation within the battery. The moist environment created by the diaphragm helps dissipate heat generated during charging and discharging more effectively. This improved thermal management minimizes the risk of thermal runaway and extends the battery's operational life.

Enhanced Stability:

Dry-wet diaphragms contribute to the overall stability of lithium-ion batteries. The controlled moisture content in the diaphragm helps mitigate side reactions between the electrode materials and the electrolyte. These side reactions, such as electrolyte decomposition and solid-electrolyte interface (SEI) layer degradation, can degrade battery performance over time. The presence of moisture in the diaphragm acts as a buffer, reducing the occurrence of these side reactions and improving the long-term stability of the battery.

Capacity Retention:

Lithium-ion batteries with dry-wet diaphragms have shown improved capacity retention over extended cycling. The enhanced ion transport and optimized electrolyte distribution within the diaphragm minimize irreversible capacity loss and electrode degradation. This translates to better long-term performance and prolonged battery life.

Safety Enhancements:

Performance Of Lithium-Ion Batteries

Dry-wet diaphragms contribute to the safety of lithium-ion batteries in multiple ways. By suppressing dendrite formation, they reduce the risk of short circuits and thermal runaway. Additionally, the controlled moisture level helps mitigate the likelihood of electrolyte leakage, electrolyte dry-out, and associated safety hazards. These safety enhancements make dry-wet diaphragms particularly suitable for applications where battery safety is critical, such as electric vehicles and grid-scale energy storage.


The introduction of dry-wet diaphragms in lithium-ion battery technology represents a significant advancement with numerous benefits. These diaphragms enhance ion transport, suppress dendrite formation, aid in thermal management, improve stability, retain capacity, and enhance safety. As research and development in this area continue, the implementation of dry-wet diaphragms is expected to further optimize the performance, longevity, and safety of lithium-ion batteries, accelerating the adoption of battery-powered technologies across various industries.

About Semco - Established in 2006, Semco Infratech has secured itself as the number 1 lithium-ion battery assembling and testing solutions provider in the country. Settled in New Delhi, Semco gives turnkey solutions for lithium-ion battery assembling and precision testing with an emphasis on Research and development to foster imaginative, future-proof products for end users.

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