Innovative Anode Design to Enhance Both Volumetric and Gravimetric Energy Densities of LiCoO2||Graphite Pouch Cells

IF 24.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL Advanced Energy Materials Pub Date : 2024-10-30 DOI:10.1002/aenm.202403804

Yidan Zhang, Hua Wang, Zezhuo Li, Xiaoyu Ge, Kai Huang, Jia-Qi Huang, Ling Huang, Zhen Li, Yunhui Huang

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Abstract

The ratio of the anode (negative electrode) and cathode (positive electrode) areal capacities (N/P ratio), is an important parameter for Lithium-ion batteries. Considering the manufacturing tolerance and battery safety, almost all of the batteries keep the N/P ratio > 1. Deviating from this ratio can lead to lithium precipitation on the anode surface, which poses significant risks. Here, by using a gradient structured graphite (Gr) anode, a new design concept is proposed that the N/P ratio could be less than 1, which can effectively achieve higher energy density without sacrificing the battery safety. This is achieved by incorporating a small quantity of silver (Ag) nanoparticles into the bottom layer of the anode (Gr-Ag_x), which effectively modulates the concentration polarization of lithium ions along the thickness of the electrode. Moreover, the volumetric energy density of 4 Ah LiCoO₂||Gr-Ag_0.5 (N/P = 0.8) pouch cell increases by 14.5% compared with LiCoO₂||Gr (N/P = 1.1). Furthermore, the universal applicability and efficacy of the N/P < 1 design paradigm in LiFePO₄||Gr cells are validated.

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创新的阳极设计可同时提高钴酸锂||石墨袋电池的体积能量密度和重力能量密度

阳极（负极）和阴极（正极）的面积容量比（N/P 比）是锂离子电池的一个重要参数。考虑到制造公差和电池安全性，几乎所有电池都保持 N/P 比为 1。这里，通过使用梯度结构石墨（Gr）负极，提出了一种新的设计理念，即 N/P 比可以小于 1，从而在不牺牲电池安全性的前提下有效实现更高的能量密度。这是通过在负极底层（Gr-Agx）加入少量银（Ag）纳米颗粒来实现的，银纳米颗粒可有效调节锂离子在电极厚度上的浓度极化。此外，4 Ah LiCoO2||Gr-Ag0.5（N/P = 0.8）袋装电池的体积能量密度比 LiCoO2||Gr（N/P = 1.1）增加了 14.5%。此外，还验证了 N/P < 1 设计模式在磷酸铁锂电池中的普遍适用性和有效性。

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来源期刊

Advanced Energy Materials CHEMISTRY, PHYSICAL-ENERGY & FUELS

CiteScore

41.90

自引率

4.00%

发文量

889

审稿时长

1.4 months

期刊介绍： Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small. With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics. The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.