NVP Hard Carbon Anode Pouch Dry Pouch Cell(Multiple Specs)

Name: NVP Hard Carbon Sodium-Ion Pouch Dry Cell (Multiple Specs)

Cell Type: NVP-Hard Carbon Pouch Dry Cell

Product Code: XN-NVP-HC

Description:

NVP Hard Carbon Sodium-Ion Pouch Dry Cell pairs sodium vanadium phosphate (Na₃V₂(PO₄)₃, NASICON-type) cathode with hard carbon anode in a fully assembled but unfilled (dry) pouch format. As a result, this configuration delivers exceptional long-term cycle stability — approximately 93% capacity retention after 2900 cycles at 1C — together with the high operating voltage (3.4 V plateau, 2.5–3.8 V window) and excellent rate capability enabled by the NASICON 3D ion-conduction framework. The crystallographically open NASICON structure provides three-dimensional sodium-ion diffusion pathways, resulting in higher power density and better rate performance than olivine-type or layered oxide sodium-ion cathodes. Furthermore, the dry (unfilled) pouch format allows customers to inject their own electrolyte formulations, making this cell ideal for advanced sodium-ion electrolyte and additive research targeting next-generation lithium-free, cobalt-free energy storage systems.

Application:

This dry pouch cell serves as a research platform for sodium-ion battery development based on NASICON-type cathodes, including sodium-ion electrolyte formulation studies (the cell ships unfilled, allowing customers to inject their own electrolyte), NVP NASICON cathode performance evaluation, hard carbon SEI and additive screening studies, full-cell prototyping for stationary energy storage, grid-scale storage, and low-speed electric mobility applications, and academic studies of NVP/hard carbon electrochemistry — particularly the comparison between NVP’s 3.4 V voltage plateau and lower-voltage polyanionic chemistries such as NFPP.

Cell Specifications (1.25 Ah Standard Grade):

Cathode Specifications (NVP):

Anode Specifications (Hard Carbon):

Values measured by Xnergy. Typical values for reference; not guaranteed unless otherwise specified.

Available Capacity Grades:

Cycling Specific Discharge Capacity:

Specific discharge capacity of NVP-Hard Carbon pouch cell at 1C over 2900 cycles. The cell starts near 108 mAh/g and stabilizes around 100 mAh/g after 2900 cycles, demonstrating the outstanding structural stability of the NASICON polyanionic framework.

Cycling Capacity Retention:

Capacity retention of NVP-Hard Carbon pouch cell at 1C over 2900 cycles. The cell retains approximately 93% of its initial capacity after 2900 cycles — among the best long-term cycle stability reported for sodium-ion chemistries, approaching LFP-class cycle life in a completely lithium-free system.

Characteristics:

Exceptional long-term cycle life (~93% @ 2900 cycles)

The NASICON-type NVP framework demonstrates outstanding structural reversibility, retaining approximately 93% of initial capacity after 2900 cycles at 1C. As a result, this cell delivers among the best long-term cycle stability reported for sodium-ion chemistries — approaching LFP-class cycle life while remaining completely lithium-free, ideal for stationary storage applications where long calendar and cycle life dominate cost-of-ownership.

Higher voltage plateau (3.4 V) for higher cell-level energy

NVP delivers a flat 3.4 V voltage plateau with a 2.5–3.8 V cutoff window — significantly higher than NFPP polyanionic chemistry (which operates at 1.5–3.4 V). Therefore, NVP-based cells deliver higher cell-level energy density than NFPP at the same capacity, making NVP the preferred choice when energy density is prioritized over absolute thermal stability.

NASICON 3D ion-conduction framework for high rate capability

The NASICON crystal structure of NVP provides three-dimensional sodium-ion diffusion pathways, resulting in excellent rate capability and high power density. Consequently, this cell is well-suited for high-rate cycling studies and applications requiring fast sodium-ion transport — characteristics that distinguish NVP from olivine-type and layered oxide sodium-ion cathodes.

Lithium-free, cobalt-free, nickel-free chemistry

NVP is built entirely on earth-abundant sodium and vanadium. Therefore, this cell eliminates dependence on lithium, cobalt, and nickel supply chains, offering a more sustainable and cost-effective alternative for grid-scale and stationary energy storage applications.

High-capacity hard carbon anode (305 mAh/g)

The hard carbon anode delivers a specific capacity of 305 mAh/g — significantly higher than the typical 260 mAh/g hard carbon used in lower-voltage sodium-ion systems. As a result, this NVP/hard carbon configuration achieves higher overall cell energy density while maintaining excellent cycling stability and forming a robust SEI compatible with sodium-based electrolytes.

Dry (unfilled) pouch design for sodium-ion electrolyte studies

The cell ships fully assembled but without electrolyte. Therefore, customers can inject their own sodium-ion electrolyte formulations to study electrolyte effects on the NVP cathode interface, hard carbon SEI formation, and additive performance — critical capabilities for advancing sodium-ion battery technology.

Multiple capacity grades + custom specifications

Standard grades cover 1.25 Ah / 2 Ah / 5 Ah. Furthermore, custom voltage windows, alternative separators, and electrode dimensions are available on request to match specific sodium-ion research requirements.

Recommended Activation Protocol:

1. Inject sodium-ion electrolyte at 8–10 g/Ah ratio. 2. Vacuum-seal the pouch under inert atmosphere. 3. Aging: hold at 45 °C for 24 h under 8 kgf/cm² stack pressure. 4. Pre-formation rest: 12 h. 5. Formation: charge at 0.1C constant current to 3.8 V (1 cycle). 6. Final aging: hold at room temperature for 24 h before subsequent cycling tests.

Packaging & Storage:

Cells ship vacuum-sealed under inert atmosphere in moisture-barrier packaging. Therefore, customers should store sealed in a cool, dry environment (15–25 °C, RH < 30 %), protected from moisture and direct sunlight. Open packaging in a dry-room or glovebox environment immediately before electrolyte filling.

Safety:

For research and industrial use only. Activated sodium-ion cells contain flammable electrolyte and reactive electrode materials. Wear PPE during cell handling and electrolyte filling. Never short-circuit, overcharge, overdischarge, puncture, or expose cells to high temperatures (> 60 °C). Always operate within the specified voltage range (2.5 – 3.8 V). NVP’s vanadium-based chemistry requires standard sodium-ion handling protocols once activated. Refer to SDS for complete safety information.

Note: Values listed above are typical and for reference only. Performance may vary depending on electrolyte choice, formation protocol, applied stack pressure, cycling conditions, and test environment. Sodium-ion chemistry is sensitive to electrolyte formulation — consult published literature for guidance on electrolytes optimized for NVP/hard carbon systems at the 3.4 V plateau. See also other dry pouch cells in our catalog: NVP Anode-Free, NFPP Polyanionic / Hard Carbon, NFPP Anode-Free, P2 Layered Oxide, Sodium Metal Single-Layer Pouch, LFP / Artificial Graphite, LFP / Lithium Metal, LFP Anode-Free, NCM811 / Artificial Graphite, NCM811 Anode-Free, and LMFP / Artificial Graphite. Browse the full Dry Pouch Cell category for all configurations.