Enhancing the thermal and electrochemical properties of 18650 type Li-ion batteries via boron nitride coating

Year 2023, Özel Sayı, 19 - 24, 30.09.2023

Semih Engün , Burak Tarhan , Benan Elmusa , Servet Turan , Nuran Ay , Hikmet Karakoç

https://doi.org/10.30728/boron.1249060

Abstract

Lithium-ion batteries have a significant safety concern since they are prone to thermal runaway as the battery technology advances to high energy density and fast charge requirements. To address this issue, new material solutions are emerging that provide better heat dissipation. Boron nitride is a promising candidate as a heat conductor material in thermal management systems because of its high thermal conductivity. Therefore, this material allows effective heat dissipation and reduces the risk of thermal runaway issues. To this end, hexagonal boron nitride (hBN) was coated onto the outer cases of 18650-type batteries to dissipate the heat produced inside the battery. A cyclic charge-discharge test was performed on the hBN-coated battery sample at 10C to compare the results with a reference sample with only a polymer insulator. The findings revealed that the hBN coating on the insulator-free battery case offered efficient heat dissipation, improved capacity retention, and less change in internal resistance. Thus, the hBN coating has the potential as a solution for the efficient thermal management of Li-ion battery cases.

Keywords

Li-ion batteries, Battery thermal management, Hexagonal boron nitride

Thanks

The authors thank Süleyman Ay for providing technical support and BORTEK® Boron Technologies and Mechatronics Company for supplying the hBN used in this study.

Bor Nitrür ile kaplı 18650 Tip Li iyon Pillerinin Isıl ve Elektrokimyasal Özelliklerinin İyileştirilmesi

Abstract

Batarya teknolojileri yüksek enerji yoğunluğuna ve hızlı şarj gereksinimlerine doğru ilerledikçe, lityum-iyon pillerin sahip olduğu termal bozunma sebepli güvenlik endişeleri devam edecektir. Bu endişe sorununu çözmek için, daha iyi ısı dağılımı sağlayan yeni malzeme çözümleri ortaya çıkmaktadır. Hekzagonal bor nitrür, yüksek termal iletkenliği nedeniyle termal yönetim sistemlerinde ısıl iletken malzeme olarak umut verici bir adaydır. Isı dağılımını etkin bir şekilde sağlayan hekzagonal bor nitrürün batarya yüzeylerinde kullanılması ile termal bozunma kaynaklı risklerin de azalacağı öngörülmektedir. Bu amaçla 18650 tipi pillerin dış yüzeyindeki polimer ambalaj çıkartıldıktan sonra sprey yöntemi kullanılarak hekzagonal bor nitrür (hBN) kaplama işlemi yapılmıştır. Kaplama işlemi sonrası batarya hücresine 10C akım hızında 100 defa şarj-deşarj testleri yapılmış olup bu süreçte meydana gelen ısıl değişimler incelenmiş ve kapasite ve iç direnç değerlerinde meydana gelen değişimler hesaplanmıştır. Elde edilen bulgular, polimer ambalajı çıkartılan ve hBN kaplama yapılan bataryanın etkin bir ısı dağılımı sergilediği, kapasite korunumunu iyileştirildiği ve iç dirençte daha az değişiklik meydana getirdiğini göstermiştir. Bu nedenle, hBN kaplama, Li-ion pillerin termal yönetimi için etkili bir çözüm olma potansiyeline sahiptir.

Keywords

Li-iyon bataryalar, Batarya yönetim sistemi, Hekzagonal bor nitrür

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