# LeydenJar

**Source:** https://www.startuphub.ai/startups/leydenjar
**Profile type:** Startup

> Develops 100% pure silicon anodes for lithium-ion batteries, increasing energy density and reducing carbon footprint.

## About

LeydenJar is a Dutch deep-tech company that pioneers 100% pure silicon anodes for lithium-ion batteries. Their proprietary technology significantly increases energy density, enables faster charging, and dramatically lowers the carbon footprint of battery production. Founded in 2016 as a spin-off from TNO, LeydenJar is headquartered in Leiden with operations in Eindhoven.

## Key facts

- **Slug:** leydenjar
- **Website:** https://leyden-jar.com/
- **Location:** Leiden, Netherlands
- **Founded:** 2016-01-01
- **Employees:** 87
- **Operating status:** Active
- **Total funding:** $71M
- **Sectors / tags:** Advanced Materials, Battery Cell Components, Cell Chemistry, Energy Storage, Cleantech, Automotive, Consumer Electronics, Hardware, Nanotechnology, E-Mobility
- **Social:**
  - LinkedIn: https://www.linkedin.com/company/leydenjar

## Frequently asked

### What does LeydenJar do?

LeydenJar is a Dutch deep-tech company that pioneers 100% pure silicon anodes for lithium-ion batteries. Their proprietary technology significantly increases energy density, enables faster charging, and dramatically lowers the carbon footprint of battery production. Founded in 2016 as a spin-off from TNO, LeydenJar is headquartered in Leiden with operations in Eindhoven.

### What is LeydenJar's valuation?

StartupHub estimates LeydenJar's effective valuation at $267.2M (range $176.6M to $423.8M, 20% confidence), based on comparable companies in the sector.

### How much funding has LeydenJar raised?

LeydenJar has raised a total of $71M in funding. The most recent round on record is Series A.

### Where is LeydenJar headquartered?

LeydenJar is headquartered in Leiden, Netherlands.

### When was LeydenJar founded?

LeydenJar was founded in 2016.

### What industry does LeydenJar operate in?

LeydenJar operates in Advanced Materials, Battery Cell Components, Cell Chemistry, Energy Storage, Cleantech, Automotive.

### How many employees does LeydenJar have?

LeydenJar has approximately 87 people on record.

## JSON-LD

Structured data aligned with this page's `<script type="application/ld+json">` (included when the profile is server-rendered).

```json
{
  "@context": "https://schema.org",
  "@graph": [
    {
      "@type": "BreadcrumbList",
      "itemListElement": [
        {
          "@type": "ListItem",
          "position": 1,
          "name": "Home",
          "item": "https://www.startuphub.ai"
        },
        {
          "@type": "ListItem",
          "position": 2,
          "name": "Startups",
          "item": "https://www.startuphub.ai/startups"
        },
        {
          "@type": "ListItem",
          "position": 3,
          "name": "LeydenJar",
          "item": "https://www.startuphub.ai/startups/leydenjar"
        }
      ]
    },
    {
      "@type": "ProfilePage",
      "@id": "https://www.startuphub.ai/startups/leydenjar#webpage",
      "url": "https://www.startuphub.ai/startups/leydenjar",
      "name": "LeydenJar - AI Startup Profile | StartupHub.ai",
      "description": "This is the official profile of LeydenJar. LeydenJar is a startup founded in 2016, operating in Advanced Materials and Battery Cell Components. Develops 100% pure silicon anodes for lithium-ion batteries, increasing energy density and reducing carbon footprint. Headquartered in Leiden, Netherlands. The company has approximately 87 employees.",
      "dateModified": "2026-05-25T10:27:57.02+00:00",
      "mainEntity": {
        "@id": "https://www.startuphub.ai/startups/leydenjar#organization"
      }
    },
    {
      "@type": "Organization",
      "@id": "https://www.startuphub.ai/startups/leydenjar#organization",
      "name": "LeydenJar",
      "url": "https://leyden-jar.com/",
      "logo": "https://cdn.startuphub.ai/storage/v1/object/public/entity-images/logos/685f6368-52a6-4d56-ace3-308f6ae44e58-square.webp",
      "image": "https://cdn.startuphub.ai/storage/v1/object/public/entity-images/logos/685f6368-52a6-4d56-ace3-308f6ae44e58-square.webp",
      "description": "This is the official profile of LeydenJar. LeydenJar is a startup founded in 2016, operating in Advanced Materials and Battery Cell Components. Develops 100% pure silicon anodes for lithium-ion batteries, increasing energy density and reducing carbon footprint. Headquartered in Leiden, Netherlands. The company has approximately 87 employees.",
      "sameAs": [
        "https://www.linkedin.com/company/leydenjar",
        "https://www.startuphub.ai/startups/leydenjar"
      ],
      "foundingDate": "2016-01-01",
      "numberOfEmployees": {
        "@type": "QuantitativeValue",
        "value": 87
      },
      "address": {
        "@type": "PostalAddress",
        "addressLocality": "Leiden",
        "addressCountry": "Netherlands"
      },
      "knowsAbout": [
        "Advanced Materials",
        "Battery Cell Components",
        "Cell Chemistry",
        "Energy Storage",
        "Cleantech",
        "Automotive",
        "Consumer Electronics",
        "Hardware",
        "Nanotechnology",
        "E-Mobility"
      ]
    },
    {
      "@type": "Product",
      "@id": "https://www.startuphub.ai/startups/leydenjar#profile-assessment",
      "name": "LeydenJar - StartupHub.ai Profile Assessment",
      "url": "https://www.startuphub.ai/startups/leydenjar",
      "image": "https://cdn.startuphub.ai/storage/v1/object/public/entity-images/logos/685f6368-52a6-4d56-ace3-308f6ae44e58-square.webp",
      "category": "Advanced Materials",
      "description": "This is the official profile of LeydenJar. LeydenJar is a startup founded in 2016, operating in Advanced Materials and Battery Cell Components. Develops 100% pure silicon anodes for lithium-ion batteries, increasing energy density and reducing carbon footprint. Headquartered in Leiden, Netherlands. The company has approximately 87 employees. Agent Readiness score: 41/100. Full audit: https://www.startuphub.ai/startups/leydenjar/agent-readiness",
      "brand": {
        "@type": "Brand",
        "name": "LeydenJar"
      },
      "review": {
        "@type": "Review",
        "author": {
          "@type": "Organization",
          "name": "StartupHub.ai"
        },
        "datePublished": "2026-05-25",
        "name": "LeydenJar - Profile Score 43/100",
        "reviewBody": "This is the official profile of LeydenJar. LeydenJar is a startup founded in 2016, operating in Advanced Materials and Battery Cell Components. Develops 100% pure silicon anodes for lithium-ion batteries, increasing energy density and reducing carbon footprint. Headquartered in Leiden, Netherlands. The company has approximately 87 employees. Agent Readiness score: 41/100. Full audit: https://www.startuphub.ai/startups/leydenjar/agent-readiness",
        "reviewRating": {
          "@type": "Rating",
          "ratingValue": 43,
          "bestRating": 100,
          "worstRating": 0
        }
      }
    }
  ]
}
```