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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

14
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
14

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Dual-Gradient Structural Design for Synchronized Phase Transitions and Stress-Resilient O3-Type Sodium Cathodes.

Yang Gu1,2,3,4, Shengya He1,3,4, Kuan Wang3

  • 1National Power Battery Innovation Center, GRINM Group Co., Ltd., Beijing 100088, P.R. China.

ACS Nano
|February 26, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new cathode material for sodium-ion batteries. This dual gradient structure enhances structural stability and cycling performance by improving sodium-ion distribution and reducing microcracks.

Keywords:
Na+ diffusion kineticsO3-type layered cathodesdual-gradient structural designsodium-ion batteriesstress-resilient architecturesynchronized phase transitions

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • O3-type layered oxides are promising sodium-ion battery cathodes due to cost and capacity.
  • Uneven sodium distribution causes phase transitions and cracks, limiting battery life.

Purpose of the Study:

  • To synthesize a novel O3-type cathode material with enhanced structural stability.
  • To improve the long-cycle performance of sodium-ion batteries.

Main Methods:

  • Synthesized Na0.99La0.01[Ni1/3Fe1/3Mn1/3]0.99Ti0.01O2 using principles of low diffusion elements and strong TM-O bonds.
  • Engineered a dual gradient distribution of La/Ti at primary and secondary particle levels.

Main Results:

  • Achieved a robust framework within secondary particles and a fast Na+ diffusion network.
  • Successfully mitigated inhomogeneous phase transitions and suppressed crack formation.
  • Demonstrated improved structural stability and long-cycle performance.

Conclusions:

  • The dual gradient structure effectively addresses uneven sodium distribution issues in O3-type cathodes.
  • This approach offers mechanistic insights for developing advanced cathode materials for sodium-ion batteries.