The development of electric vehicle transport is directly dependent on progress in the field of energy storage. Korean scientists from Sungkyunkwan University and Seoul National University have presented a solution that could radically change the parameters of modern lithium-ion batteries. The new invention — a hybrid polymer binder material — promises to make batteries more powerful, durable, and reliable without the need for a complete overhaul of production lines.

The problem of thick electrodes

To increase the range of electric vehicles, engineers strive to increase the thickness of electrodes, which allows more energy to be stored in the same volume. However, traditional technologies face a serious obstacle. In the production of thick electrodes, the standard binder material is distributed unevenly: as it dries, it migrates to the surface.

This displacement leads to critical consequences: the mechanical strength of the structure deteriorates, electrical conductivity drops, and the battery begins to wear out much faster. It is precisely to solve this problem that a new material called Dual-Acting Hybrid Polymer (DHP) was developed.

Spandex and chemistry synergy

The essence of the innovation lies in the unique combination of two polymers with different physical properties. Scientists combined spandex and polyacrylic acid to obtain a material with a dual effect:

  • Spandex ensures the elasticity of the structure, allowing the electrode to withstand mechanical loads and preventing the formation of microcracks during operation.
  • Polyacrylic acid forms strong chemical bonds between electrode particles, significantly increasing the overall reliability and integrity of the structure.

Self-protection and efficiency

One of the key features of DHP is its ability to self-regulate. During the first charging cycles, the material independently forms a protective lithium interface. This layer facilitates the movement of lithium ions inside the battery, reduces internal resistance, and, as a result, increases the overall efficiency of the battery.

Test results: record durability

Testing of the new binder material showed impressive results. Compared to the widely used standard — polyvinylidene fluoride (PVDF) — the new material provides almost a twofold increase in bonding strength.

During comparative tests on commercial battery cells, those with the traditional binder began to noticeably lose their characteristics after just 95 charge cycles. Meanwhile, cells equipped with DHP demonstrated high stability: even after more than 200 cycles, they retained about 86.8% of their initial capacity.

Easy implementation in production

An important factor for the commercial success of the technology is its compatibility with existing production capacities. Developers emphasize that implementing DHP does not require replacing equipment or complex restructuring of technological processes. This significantly simplifies and cheapens the transition of manufacturers to the new standard.

Experts believe that this development could be a fundamental step towards the creation of next-generation batteries that will provide electric vehicles with a significantly greater range and extended service life.