Dataset Supporting Mechanistically Resolved Thermal–Surfactant Delamination of Spent LiFePO₄ and LiCoO₂ Cathodes for Low-Aluminum Powder Recovery
Description
This dataset supports the hypothesis that thermal preconditioning, followed by warm aqueous surfactant treatment and agitation, weakens the cathode coating-to-aluminium interface and enables recovery of chemistry-specific LiFePO4 (LFP) and LiCoO2 (LCO) powders with limited aluminium carryover. The repository contains “Coupon_level.xlsx” with 162 coupon-level records; 36 raw 90° peel-test workbooks; and 27 optical images with 27 binary masks. Each chemistry was examined using a 3 × 3 × 3 factorial design: 250, 300 and 350 °C; 0.5, 1.5 and 3.0% (v/v) commercial product; and 30, 60 and 90 min washing. Three feedstock lots were represented at each condition. Principal responses are delamination efficiency, recovered-powder yield, mass closure and exposed-foil area. Peel files provide time, displacement and force data for pristine electrodes and specimens treated at 200, 240, 280, 320 and 350 °C. Optical files cover pristine, 240 °C and 280 °C specimens from 0 to 90 min. Maximum delamination was 98.11% for LFP and 96.19% for LCO at 300 °C, 3.0% (v/v) and 90 min. At 280 °C, normalized peel strength fell from 270 to 49 N m−1 for LFP and from 295 to 65 N m−1 for LCO, demonstrating weakening before washing. The 280 °C specimen reached approximately 95% detached area within 28 min. The coupon data may be used for factorial modelling; peel traces for force-displacement analysis; and masks for detached-area kinetics.
Files
Steps to reproduce
Spent LFP and LCO cathodes were discharged, dismantled, chemistry-sorted and cut into approximately 2 × 2 cm coupons. Three independent feedstock lots per chemistry were blocked across all factorial conditions. Coupons were heated in ceramic crucibles at 5 °C min−1 to the assigned temperature, held for 30 min and cooled naturally. Pretreated coupons were washed in distilled water containing 0.5, 1.5 or 3.0% (v/v) Blue Moon antibacterial handwash with aloe at 65 ± 5 °C and 300 rpm. After 30, 60 or 90 min, suspensions were vacuum-filtered; foils and powders were rinsed, vacuum-dried at 80 °C for 12 h or to constant mass, cooled and weighed. Responses were calculated from initial electrode mass, bare-foil mass, cleaned-foil mass, recovered-powder mass and exposed area. Peel testing used fixed 90° geometry, PET backing, acrylic transfer tape, 50 mm min−1 speed and at least 10 Hz acquisition. Optical detachment was recorded in a transparent wash cell at defined times and converted to binary masks. Reproduction should retain the same commercial formulation, coupon size, heating profile, wash volume, temperature, stirring rate, treatment time and response equations.
Institutions
- Shanxi UniversityShanxi, Taiyuan