Mariela Fonseca
PhD Candidate in Chemistry, Defense Spring 2027 | Materials Scientist
New Haven, CTmariela.fonseca@example.com(203) 555-0122Summary
Doctoral candidate in materials chemistry with four years of research on solid electrolytes for lithium batteries, including a synthesis route that doubled ionic conductivity at a third of the precursor cost. Spent a summer scaling that route from gram to kilogram batches at a battery materials company. Four first-author papers, one patent application, and a defense scheduled for spring 2027; seeking a materials scientist role in energy storage.
Experience
Doctoral Researcher, Solid-State Electrolytes, Sachem Harbor University
– Present
New Haven, CT
- Developed a low-temperature synthesis for a sulfide electrolyte that raised room-temperature ionic conductivity from 1.2 to 2.6 mS/cm while replacing a precursor that was 70 percent of material cost.
- Built and automated a glovebox cell-assembly workflow that took the group from 6 to 20 test cells a week; four lab members use it now.
- Characterized phases with XRD, Raman and impedance spectroscopy, and wrote the Python fitting scripts the group uses for equivalent-circuit analysis.
- Published four first-author papers and co-authored three others; filed one provisional patent with the university's technology office.
- Supervised two rotation students and one undergraduate thesis, each of whom finished with a presented poster.
R&D Intern, Electrolyte Scale-Up, Saybrook Battery Materials
–
Branford, CT
- Transferred the lab synthesis to a one-kilogram pilot reactor, hitting the conductivity target on the third batch after adjusting the milling step.
- Wrote the batch record and the hazard review for the process, both adopted by the pilot team after the internship.
- Presented a cost-per-kilogram model to the product lead that supported a decision to continue the program for a second year.
Teaching Fellow, General Chemistry Laboratory, Sachem Harbor University
–
New Haven, CT
- Taught two lab sections of 20 students each per semester for four semesters, including chemical safety training on the first day.
- Received the department's teaching fellow award in 2024 on student evaluations and the course head's nomination.
Education
Doctor of Philosophy in Chemistry (expected May 2027)
Sachem Harbor University, New Haven, CT
Dissertation: Low-temperature routes to sulfide solid electrolytes. Advanced to candidacy 2024. National graduate research fellowship, 2023 to 2026.
Bachelor of Science in Chemistry
Blackstone Valley University, Providence, RI
Summa cum laude. Two years of undergraduate research on polymer electrolytes.
Skills
- Solid-state and solution synthesis
- Glovebox and air-free technique
- X-ray diffraction and Rietveld refinement
- Electrochemical impedance spectroscopy
- Raman and FTIR spectroscopy
- Coin and pouch cell assembly
- Python (pandas, lmfit, matplotlib)
- Process scale-up and batch records
- Design of experiments
- Scientific writing and peer review
- Spanish (native)