Unraveling the ethylene carbonate effect on the electro-chemical/thermosafety features for practical LiNi0.9Co0.05Mn0.05O2∥graphite pouch cells

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Science China Materials Pub Date : 2024-08-01 DOI:10.1007/s40843-024-3009-4

Zhihao Liu (, ), Xin Wen (, ), Yingchen Xie (, ), Fengfei Wang (, ), Li Wang (, ), Yu Wu (, ), Xuning Feng (, )

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Abstract

With the continuous development of the electrification industry, the development of high-specific batteries has attracted much attention. However, the safety of lithium-ion batteries is currently unable to meet the market demand due to poor thermal stability. Solving the thermal issues is crucial to improve battery safety. Ethylene carbonate (EC) not only plays an important interfacial film-forming role, but also poses safety risks in terms of reactivity. In this work, we conducted a series of gradient experiments utilizing different EC amounts and verified the effect of reducing EC on battery performance. A strategy is also proposed to design a new electrolyte. Ethyl methyl carbonate (EMC) is used instead of EC as the main solvent to improve the thermal safety of the battery, while salts and additives are used to dominate the film formation to improve the cycling stability of the battery under high voltages (4.5 V, ∼90% after 200 cycles). This work paves a new avenue for the development of novel electrolyte systems.

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揭示碳酸乙烯对实用 LiNi0.9Co0.05Mn0.05O2∥Graphite 袋式电池的电化学/热安全特性的影响

随着电气化产业的不断发展，高规格电池的开发备受关注。然而，由于热稳定性差，锂离子电池的安全性目前还无法满足市场需求。解决热问题是提高电池安全性的关键。碳酸乙烯（EC）不仅起着重要的界面成膜作用，还存在反应性方面的安全风险。在这项工作中，我们利用不同的 EC 量进行了一系列梯度实验，验证了减少 EC 量对电池性能的影响。我们还提出了一种设计新型电解质的策略。使用碳酸甲乙酯（EMC）代替 EC 作为主溶剂，以提高电池的热安全性，同时使用盐和添加剂来主导薄膜的形成，以提高电池在高电压下的循环稳定性（4.5 V，200 次循环后可达 90%）。这项研究为新型电解质系统的开发开辟了一条新途径。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.