Electrical Energy Storage

Electrical energy storage underpins modern power systems by smoothing fluctuations from variable renewable sources, enhancing grid stability and enabling portable electronics and electric transport. Principal technologies exploit electrochemical, electrostatic and electromechanical principles. Electrochemical devices—batteries and electrochemical capacitors—store energy via redox reactions or charge separation at electrode–electrolyte interfaces. Batteries deliver high energy density through reversible ion insertion, alloying or conversion reactions in solid electrodes, but their power delivery can be rate‐limited by ionic transport and they often require thermal management. Electrochemical capacitors combine double‐layer charge storage and fast surface redox, offering extraordinarily high power density and cycle life at lower energy density. Mechanical and thermal storage methods—such as pumped hydro, compressed air or phase‐change materials—complement chemical and electrical storage on larger scales. Across all approaches, electrode architecture, interfacial phenomena and materials selection determine performance metrics including energy and power density, cycle life, charge/discharge efficiency and safety. Advances in nanostructured electrodes, solid‐state electrolytes and hybrid architectures aim to reconcile the trade‐off between energy and power, reduce costs and improve durability for applications from grid‐scale buffering to wearable electronics.

Research from Nature Portfolio

High‐throughput simulations combined with atomistic modelling have guided the design of multi‐ion‐capable anodes. A hybrid MXene/MoSe₂@C heterostructure has been demonstrated as a universal anode for lithium, sodium and potassium systems; atomic‐scale simulations reveal favourable ion‐migration pathways and competitive sodium mobility, while experiment confirms enhanced electronic conductivity and high Coulombic efficiency across all three chemistries, pointing to a route for multi‐ion storage platforms. In parallel, the introduction of tunable tensile strain in MoSe₂ nanosheets has been shown to alter the Gibbs free energy of sodium storage reactions. Strain inherited by discharged metallic phases shifts the Mo d-band centre closer to the Fermi level, strengthening Na₂Se adsorption, reducing conversion barriers and yielding highly reversible sodium storage with improved kinetics. For electrochemical capacitors, operando electro-optical imaging of single Prussian blue nanoparticles under sinusoidal potential modulation has elucidated dual pseudocapacitive regimes—diffusion-limited at low frequency and surface-charging at high frequency—and quantified a consistent two-unit-cell surface-charging layer, providing mechanistic guidance for nano-engineered pseudocapacitor electrodes.

Research from all publishers

Aerosol‐templated fabrication of porous MoSe₂/carbon microspheres for potassium‐ion battery anodes has delivered uniformly embedded nanocrystals in a conductive matrix. The well‐designed pore channels accommodate large volume changes and shorten diffusion pathways, achieving high reversible capacity (≈193 mAh g⁻¹ after 500 cycles at 2 A g⁻¹) and robust rate performance. In sodium storage, anatase TiO₂–coated interlayer–expanded MoSe₂/phosphorus-doped carbon nanospheres have achieved ultrafast pseudocapacitive behaviour with reversible capacities above 200 mAh g⁻¹ at high current densities and remarkable cycling stability over thousands of cycles, underscoring the benefits of core–shell architectures. Interface engineering of MoSe₂/carbon composites via a MoC intermediate has produced ultrafine MoSe₂ nanodots on a nitrogen-doped 3D carbon framework, yielding outstanding cycle life (over 90 % capacity retention after 5 000 cycles at 2 A g⁻¹) and stable operation in full cells, illustrating the power of controlled interface chemistry for high‐rate lithium storage.

Electrical Energy Storage publication trend

The graph below shows the total number of articles in electrical energy storage across all publications each year (not limited to Nature Index journals).

Technical terms

Energy density: Energy stored per unit mass or volume of a storage device, typically expressed in Wh kg⁻¹ or Wh L⁻¹. Higher energy density enables longer operation between charges.

Power density: Rate at which energy can be delivered per unit mass or volume, expressed in W kg⁻¹ or W L⁻¹. High power density is essential for rapid charge/discharge applications.

Coulombic efficiency: Ratio of charge extracted during discharge to the charge input during charge. A value near 100 % indicates minimal parasitic reactions and high reversibility.

Pseudocapacitance: Rapid, reversible Faradaic charge storage occurring at or near the electrode surface, supplementing electrostatic double‐layer charge and enhancing capacitance.

Gibbs free energy: Thermodynamic potential that governs the spontaneity of electrochemical reactions; modulation via strain or composition directly affects reaction barriers and reversibility.

Heterostructure: Composite electrode architecture formed by intimate contact between distinct materials, designed to synergistically improve electronic conductivity and ionic transport.

References

1. Strain-regulated Gibbs free energy enables reversible redox chemistry of chalcogenides for sodium ion batteries. Nature Communications (2022).
2. TiO2‐Coated Interlayer‐Expanded MoSe2/Phosphorus‐Doped Carbon Nanospheres for Ultrafast and Ultralong Cycling Sodium Storage. Advanced Science (2018).
3. Facile Fabrication of Porous MoSe2/Carbon Microspheres via the Aerosol Process as Anode Materials in Potassium-Ion Batteries. Batteries (2024).
4. Tuning Interface Bridging Between MoSe2 and Three-Dimensional Carbon Framework by Incorporation of MoC Intermediate to Boost Lithium Storage Capability. Nano-Micro Letters (2020).
5. Determining the depth of surface charging layer of single Prussian blue nanoparticles with pseudocapacitive behaviors. Nature Communications (2022).
6. Architectural design of anode materials for superior alkali-ion (Li/Na/K) batteries storage. Scientific Reports (2024).
7. Electrical Energy Storage.