Everlyte Energy

Core Materials for
All-Solid-State Batteries

Everlyte focuses on the development and scalable manufacturing of critical raw materials for sulfide-based solid-state batteries, with high-purity lithium sulfide as its core product.

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Everlyte high-purity lithium sulfide powder

Core Product

Fine-Particle High-Purity Lithium Sulfide

Designed for sulfide solid electrolyte synthesis, the product is controlled across key specifications including purity, oxygen content, carbon content, moisture, metallic impurities and particle size distribution. Everlyte uses a proprietary, scalable synthesis process and can provide customization in particle size, product characteristics and packaging based on customer process requirements.

Purity ≥99.9%
Moisture ≤50 ppm and carbon ≤0.03%
Average particle size can be as low as 1 μm
Evaluation samples are available; standard packaging is 2–5 kg per container, with larger packaging formats also supported

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Product Specification

Published Product Specifications

The table below presents the published control specifications and test methods from the current product COA. Actual batch results are reported in the corresponding COA.

Test Item	ELS-B2 Specification	Methodology
Purity	≥99.9%	Metal basis
Na	≤50 ppm	ICP
K	≤30 ppm	ICP
Fe	≤10 ppm	ICP
Al	≤10 ppm	ICP
Ti	≤10 ppm	ICP
Si	≤10 ppm	ICP
Carbon Content	≤0.03%	High-frequency combustion–infrared absorption
Oxygen Content	≤0.1%	Inert-gas fusion–infrared absorption
Moisture Content	≤50 ppm	Moisture analyzer
Particle Size Distribution	D50: 2.0±0.2 μm D10, D90 and Dmax are reported in the batch COA	Laser diffraction

A representative batch measured D10 1.2 μm, D50 1.9 μm, D90 4.3 μm and Dmax 8.0 μm. These values apply only to that batch.

Capabilities

From Materials R&D to Ton-Scale Supply

Our integrated capabilities connect materials development, analytical evaluation, process scale-up and manufacturing.

01 / R&D

Materials & Process Development

Synthesis, purification, particle-size control and application-oriented product development.

02 / QUALITY

Analysis & Quality Evaluation

Systematic evaluation of purity, O/C/H₂O, metallic impurities, whiteness and particle size.

03 / SCALE-UP

Engineering & Manufacturing

A 50 t/y pilot line is in operation, with ton-scale supply delivered to downstream customers.

About Everlyte

Advanced Materials R&D and Industrialization

Shenzhen Everlyte Energy Co., Ltd. was established in September 2022 and incubated by the Advanced Energy Storage Materials & Devices Laboratory at the Research Institute of Tsinghua University in Shenzhen. Its R&D center is located at the Research Institute in Nanshan District, Shenzhen.

Its wholly owned manufacturing subsidiary, Zhejiang Everlyte Advanced Materials Co., Ltd., is responsible for scale-up, manufacturing and commercial supply.

Learn about our company structure