Thermal runaway characteristics of Ni-rich lithium-ion batteries employing TPP-based electrolytes

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS

ACS Applied Bio Materials Pub Date : 2024-07-22 DOI:10.1115/1.4066013

Zhenhai Gao, S. Rao, Zien Zhang, Yupeng Wang, Yang Xiao, Quan Yuan, Weifeng Li

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引用次数: 0

Abstract

Enhancing the safety performance of high-energy-density lithium-ion batteries are crucial for their widespread adoption. Herein, a cost-effective and highly efficient electrolyte additive, Triphenyl phosphate (TPP), demonstrates flame-retardant properties by scavenging hydrogen radicals in the flame, thereby inhibiting chain reactions and flame propagation to enhance the safety performance of graphite/LiNi0.8Co0.1Mn0.1O2 (NCM811) pouch cells. The results reveal that the capacity retention of cells without flame retardants, and those with the addition of 1 wt%, 3 wt%, 5 wt%, and 10 wt% TPP, is 96.4%, 92.1%, 84.15%, 71.0%, and 15.4% (1/2C 300 cycles), respectively. Furthermore, compared to cells without flame retardants, the highest temperature during thermal runaway decreases by 10.7%, 28.9%, 36.8%, and 40.4% with the addition of 1 wt%, 3 wt%, 5 wt%, and 10 wt% TPP, respectively. Through comprehensive analysis of the impact of flame-retardant additives on battery electrochemical performance and safety, it is determined that the optimal addition amount is 3 wt%. At this level, there are no significant flames during battery abuse, the triggering temperature for thermal runaway increases by 26.6°C, nd the maximum temperature decreases by 175°C. Moreover, even after 300 cycles at 1/2C, a capacity of 814.5mAh g-1 is retained, with a capacity retention rate of 84.1%. This study provides valuable insights into the mitigation of thermal runaway in high-energy-density power batteries.

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采用 TPP 电解质的富镍锂离子电池的热失控特性

提高高能量密度锂离子电池的安全性能对其广泛应用至关重要。在本文中，一种具有成本效益的高效电解质添加剂磷酸三苯酯（TPP）通过清除火焰中的氢自由基显示出阻燃特性，从而抑制链式反应和火焰传播，提高石墨/镍钴锰酸锂（NCM811）袋装电池的安全性能。结果表明，不添加阻燃剂和添加 1 wt%、3 wt%、5 wt% 和 10 wt% TPP 的电池容量保持率分别为 96.4%、92.1%、84.15%、71.0% 和 15.4%（1/2C 300 次循环）。此外，与不添加阻燃剂的电池相比，添加 1 wt%、3 wt%、5 wt% 和 10 wt% TPP 后，热失控时的最高温度分别降低了 10.7%、28.9%、36.8% 和 40.4%。通过综合分析阻燃添加剂对电池电化学性能和安全性的影响，确定最佳添加量为 3 wt%。在这一添加量下，电池在滥用过程中不会产生明显的火焰，热失控的触发温度上升了 26.6°C，最高温度下降了 175°C。此外，即使在 1/2C 下循环 300 次，电池容量仍能保持在 814.5mAh g-1 的水平，容量保持率达到 84.1%。这项研究为缓解高能量密度动力电池的热失控问题提供了宝贵的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Bio Materials Chemistry-Chemistry (all)

CiteScore

9.40

自引率

2.10%

发文量

464

期刊介绍： ACS Applied Bio Materials is an interdisciplinary journal publishing original research covering all aspects of biomaterials and biointerfaces including and beyond the traditional biosensing, biomedical and therapeutic applications. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important bio applications. The journal is specifically interested in work that addresses the relationship between structure and function and assesses the stability and degradation of materials under relevant environmental and biological conditions.