Shaanxi Researchers Achieve Battery Breakthrough Using Atomic-Level Titanium-Chromium Nitride Catalyst Tuning

Shaanxi researchers develop a Ti-Cr nitride catalyst that maintains 93% battery capacity over 600 cycles, solving the lithium-sulfur shuttle effect.

By: AXL Media

Published: Apr 30, 2026, 9:40 AM EDT

Source: Information for this report was sourced from EurekAlert!

Solving the Efficiency Gap in High-Density Energy Storage

Lithium-sulfur batteries have long been regarded as the next frontier for clean energy due to a theoretical energy density roughly six times that of conventional lithium-ion cells. However, the practical application of this technology has been stalled by the polysulfide shuttle effect, which causes rapid capacity loss and poor efficiency. In a study published in Nano Research on April 22, 2026, Professor Jie Sun and a research team from Shaanxi Normal University revealed a major breakthrough. By utilizing atomic-level precision engineering, the team developed a titanium-chromium nitride catalyst that effectively traps and converts polysulfides, addressing the primary barrier to high-performance sulfur-based storage.

Precision Engineering via Solid-Solution Phase Modulation

The advancement centers on the continuous adjustment of the electronic structure within a TixCr1-xN solid-solution. According to Professor Jie Sun, the innovation is not a simple mixture of materials but a true solid-solution phase achieved through atomic-scale interface engineering. By using electrospinning and high-temperature nitridation, the team synthesized flexible membranes embedded with these bimetallic nitrides. This method allowed the researchers to fine-tune the d-band electronic configuration of the catalyst, which is essential for facilitating the electron transfer required for rapid polysulfide conversion.

Optimizing the Atomic Ratio for Peak Catalytic Activity

Through a combination of theoretical modeling and experimental validation, the researchers identified that a Ti/Cr atomic ratio of 1:2 yields the most effective results. At this specific ratio, the d-band center of the catalyst is optimally positioned to maximize adsorption energy for polysulfides. This configuration ensures that the catalyst can simultaneously "trap" polysulfides through chemical adsorption and "convert" them through accelerated electrocatalytic activity. This dual-functionality fundamentally resolves the slow reaction kinetics that typically plague lithium-sulfur battery cathodes during charge and discharge cycles.