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Carbon, H2, and Al2O3 recovery fromspent battery separator viapyrolysis followed by chemicalvapor deposition (CVD)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2025 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [sv]

Utvecklingen av elfordon har ökat produktionen av Li-jonbatterier. Med den ökande marknadsandelen av el- och hybridfordon är återvinningen av hela värdekedjan för Lijonbatterier akut för att hantera avfall från fordonsbatterier. Detta arbete granskade de grundläggande principerna och nyckelkomponenterna för Li-jonbatterier, samt produktionsoch återvinningsprocesserna för separatorer i Li-jonbatterier. Möjligheten att återvinna kol, H2och Al2O3 via pyrolys kombinerat med kemisk ångdeposition (CVD) har verifierats. Olika processbetingelser, t.ex. CVD-temperatur och katalysator-/råvaruförhållanden, har undersökts. Resultaten visade att mer än 90 viktprocent av råmaterialet kan återvinnas som kol, gas och Al2O3. Vid en CVD-temperatur på 900°C och ett C/F-förhållande på 1 kan väteutbytet nå 15,25mmol/g. På grund av järnkatalysatorns selektivitet bildas kolnanorör som kolförening när CVD-temperaturen överstiger 800°C. Inom ramen för denna studie erhölls de optimala förhållandena för återvinning av H2 och kolprodukter vid en CVD-temperatur på 900°C och ett C/F-förhållande på 1, vilket motsvarade ett kolutbyte på 12 viktprocent och ett H2-utbyte på 15,25 mmol/g.

Abstract [en]

The development of electric vehicles boosted the production of Li-ion batteries. With the increase in the market share of electric and hybrid vehicles, the full value chain recycling of the Li-ion battery is urgent in dealing with the waste vehicle batteries. This work reviewed the basic principle and the key components of the Li-ion battery, as well as the production and recycling processes of the Li-ion battery separator. Verified the possibility of recycling carbon, H2, and Al2O3 via pyrolysis combined with chemical vapor deposition (CVD) processes. Various process conditions, e.g., CVD temperature and catalyst/feedstock ratios, have been investigated. The results showed that more than 90 wt.% of the raw material can be recycled as carbon, gas, and Al2O3. At the CVD temperature of 900℃ and C/F ratio of 1, the hydrogen yield can reach 15.25 mmol/g. Due to the selectivity of the iron catalyst, the carbon nanotube is formed as the carbon product once the CVD temperature is beyond 800℃. In the scope of this study, the optimal condition for H2 and carbon products recycling was obtained at a CVD temperature of 900℃ and a C/F ratio of 1, corresponding to a carbon yield of 12 wt.% and an H2 yield of 15.25 mmol/g.

Place, publisher, year, edition, pages
2025. , p. 42
Series
TRITA-ITM-EX ; 2025:10
Keywords [en]
Lithium-ion battery, separator, plastic recycling, pyrolysis, CVD
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-359815OAI: oai:DiVA.org:kth-359815DiVA, id: diva2:1937061
External cooperation
Senior Material (Europe) AB
Subject / course
Materials and Process Design
Educational program
Master of Science - Engineering Materials Science
Supervisors
Examiners
Available from: 2025-02-12 Created: 2025-02-12

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CiteExportLink to record
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Citation style
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