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전기화학기반 열화모델을 이용한 리튬이온 배터리의 수명 예측
전동협,황두선 대한기계학회 2023 大韓機械學會論文集A Vol.47 No.7
We performed the degradation and life prediction of lithium-ion batteries using an electrochemical-based degradation model. Numerical simulation was carried out considering three different degradation models (that is, SEI growth, SEI growth on the particle crack, and Li plating), and the DFN model was employed to solve the electrochemical kinetics and complex mass transfer phenomena. The result predicted an 80% of capacity decrease on reaching 9.16 years, in which the contribution of the SEI growth on the particle crack was dominant. The effect of the SEI growth was small, and the influence of Li plating became significant with decreasing temperature and increasing C-rate.
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SEI 성장 모델을 이용한 리튬 이온 배터리의 캘린더 노화 연구
전동협 ( Dong Hyup Jeon ),채병만 ( Byungman Chae ),이상우 ( Sangwoo Lee ) 한국공업화학회 2024 공업화학 Vol.35 No.1
전기화학 기반의 SEI 성장 모델을 이용하여 리튬이온 배터리의 캘린더 노화 및 장기 수명을 예측하였다. 네 가지 유형의 장기 SEI 성장 모델(용매 확산 제한 모델, 전자 이동 제한 모델, 리튬-간극 확산 제한 모델, 반응 제한 모델)을 적용하여 수치해석이 이루어졌고, 캘린더 에이징 동안의 용량 감소와 리튬 재고 손실을 계산하였다. 수치해석 결과, 전자 이동 제한 모델과 리튬-간극 확산 제한 모델이 낮은 용량 감소를 보였으며, 용매 확산 제한 모델과 반응 제한 모델은 10년이내에 80%의 용량 감소를 보였다. 캘린더 노화 중 저온 보관 시 SEI의 성장을 저하시켜 용량 감소가 적었다. 사이클링 중 C-rate가 증가할수록 SEI 두께 증가로 수명 하락이 크게 나타났으나 그 차이는 크지 않았다. We predicted the calendar aging and long-term lifetime of lithium-ion batteries using an electrochemical-based SEI growth model. Numerical simulation was carried out employing the four different long-term SEI growth models (i.e., solvent diffusion limited model, electron migration limited model, Li-interstitial diffusion limited model, reaction limited model), and we calculated the capacity fade and loss of lithium inventory during calendar aging. The result showed that the electron migration limited model and Li-interstitial diffusion limited model showed lower capacity fade, while the solvent diffusion limited model and reaction limited model reached 80% of capacity fade within 10 years. During calendar aging, the lower storage temperature showed less capacity fade due to the hindrance of SEI growth rate. During cycling, the higher C-rate showed a shorter life cycle; however, the differences were not significant.
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Lab scale electrochemical codeposition experiments for comparison to computational predictions
Lafreniere, Philip,Zhang, Chao,Simpson, Michael,Blandford, Edward D. Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.9
Signature-based safeguards (SBS) is being developed to assist tradition nuclear material accountancy methods in tracking material in pyroprocessing facilities. SBS involves identifying off-normal scenarios that would result in improper movement of material in a pyroprocessing facilities and determining associated sensor response signatures. SBS investigations are undertaken in the computational space utilizing an electrochemical transport code known as enhanced REFIN with anodic dissolution (ERAD) to calculate the affect of off-normal conditions in the electrorefiner (ER) on material movement. Work is undertaken to experimentally validate the predictions and assumptions made by ERAD for off-normal occurrences. These experiments were undertaken on a benchtop scale and involved operating an electrochemical cell at 10 separate current densities for constant current operations to deposit U and Gd at a W cathode. These experiments were then modeled using ERAD to compare calculated predictions versus analytical experimental results it was found. It was discovered both the experimental and calculated results reflect a trend of increased codeposition of U and Gd with increasing current density. ERAD was thus demonstrated to be useful for predicting trends from anomalous operation but will require further optimization to be utilized as a quantitative design tool.
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