The team from the School of Materials at Northeastern University proposed a novel lead-free TIBs relaxor ferroelectric ceramic, Bi0.15Na0.15Sr0.3Ba0.4Nb2O6-1 wt% C6H5O7Na3, achieving a Wrec of 9.53 J cm-3 at 730 kV cm-1 and an ultra-high η of 92%. This represents a significant breakthrough in the performance of lead-free TIBs energy storage ceramics. By incorporating C6H5O7Na3, the team effectively suppressed the concentration of oxygen vacancy defects, inhibited abnormal grain growth, and formed dense grain boundaries to prevent defect diffusion under external stimuli. These modifications enhanced the energy storage performance and excellent stability. This discovery not only validates the optimization strategy for TIBs-based dielectric capacitors but also introduces C6H5O7Na3 into the lead-free relaxor ferroelectric ceramic system. In summary, this work establishes a new design paradigm integrating the characteristics of "lead-free composition, high performance, high stability," providing important technical support for the application of lead-free energy storage ceramics in pulsed power systems and next-generation energy storage applications.

Article Title: 《Optimization energy storage of tungsten bronze structure ceramics based on organic complexation defect engineering strategy》

Journal: 《Journal of Energy Chemistry》

Customer: Northeastern University

Product Applied: GoGo Instruments Mini Probe Station EH200-Mini

The team from the School of Materials at Northeastern University proposed that A-site multi-ion co-doping and Sr/Ba ratio optimization based on a multiple collaborative control strategy significantly improved the energy storage performance of Sr0.5Ba0.5Nb2O6-based tungsten bronze ceramics. After introducing Bi³⁺ and Na⁺, the lone pair electron effect of Bi³⁺ was utilized to enhance the spontaneous polarization response intensity. Simultaneously, the lattice distortion caused by the introduction of Bi³⁺ was counteracted by Na⁺ with its smaller radius. Further adjusting the Sr/Ba ratio achieved grain refinement, promoted the formation of polar nanoregions (PNRs), expanded the material's band gap, and strengthened the relaxor characteristics. Finally, the synergistic optimization of polarization intensity and breakdown field strength was realized. This synergistic effect resulted in ceramics exhibiting slender P-E loops, ultimately achieving a recoverable energy density (Wrec) of 6.38 J/cm³ and a high energy storage efficiency (η) of up to 93%. This work proposes a new component design concept for developing lead-free ceramic capacitors with high energy storage density and efficiency.

Article Title: 《Multiple collaborative optimization strategy regulates tungsten bronze ceramics to achieve efficient energy storage performance》

Journal: 《Journal of Energy Storage》

Customer: Northeastern University

Product Applied: GoGo Instruments Mini Probe Station EH200-Mini

Applied Product and Parameters:

Temperature Range: RT ~ 200°C

Temperature Stability: ±0.1°C

Heating/Cooling Rate: Max Heating Rate: 150°C/min; Cooling Rate Controllable

Probes: High-voltage probe socket + Gold-plated copper probes

Sample Stage: Copper; φ20mm & 4mm

Probe Interface: BNC

Chamber: Open