Key Takeaways & Executive Findings
- •• Sodium ion batteries (SIBs) are a promising, cost-effective alternative to lithium-ion batteries due to abundant sodium reserves. • Anode materials for SIBs include carbon-based, metallic, and organic types, operating via intercalation, alloying, or conversion mechanisms. • Key challenges for SIB anodes include slow Na+ diffusion, large volume changes, and unstable solid electrolyte interface (SEI), addressed by doping, coating, and structural modifications. • This review provides a comprehensive overview of anode development, highlighting strategies to improve initial coulombic efficiency, cycling stability, and low potential plateaus.
Abstract
Lithium-ion batteries (LIBs) are used in electric vehicles and portable smart devices, but lithium resources are dwindling and there is an increasing demand which has to be catered for. Sodium ion batteries (SIBs), which are less costly, are a promising replacement for LIBs because of the abundant natural reserves of sodium. The anode of a SIB is a necessary component of the battery but is less understood than the cathode. This review outlines the development of various types of anodes, including carbon-based, metallic and organic, which operate using different reaction mechanisms such as intercalation, alloying and conversion, and considers their challenges and prospects. Strategies for modifying their structures by doping and coating, and also modifying the solid electrolyte interface are discussed. In addition, this review also discusses the challenges encountered by the anode of SIBs and the solutions.
1. Introduction
Global warming is a big problem for mankind and fossil fuels are largely responsible for it. Burning fossil fuels have caused about 85% of CO2 emissions in the past decade. Use of electric vehicles (EVs) is one of the ways to cut the use of fossil fuels. Secondary batteries constitute an important part of EVs. Metal ion batteries like LIBs are one of the examples of secondary battery, commercialized in 1991 by SONY[1]. From then it has been used increasingly in electrically powered vehicles, electronic devices, stationary energy storage systems (ESS) and telecommunication systems[2]. Demand and mining of lithium has risen greatly due to the increase in the usage of electrical appliances, EVs, portable electronics and growth in the use of stationary grid ESS[3]. Due to this rise in demand the price of raw materials of LIBs is increasing exponentially[4]. In addition, lithium deposits are located mostly in some specific regions of the world and are not found uniformly[5]. Due to the problems related to LIBs, scientists are exploring the use of earth-abundant elements for metal ion batteries.
Sodium ion batteries (SIBs) are promising alternatives for replacing LIBs in the near future. Even before 1980 there was research being done on Na+ ions as charge carriers for electrochemical energy storage. NaxCoO2 was studied as positive electrode materials in SIBs in early 1980s (Fig. 1). SIBs have many benefits[6]. As the fourth most abundant element on the earth, sodium accounts for 2.83% in the crust [7,8]. In addition, Na does not alloy with Al, which makes it possible to use Al in place of Cu foil as an anode current collector which is cost effective and convenient[9]. The sodium redox couple is −2.71 V in comparison with −3.04 V of lithium redox couple which is not very far-off. So, SIBs can be a reasonable competitor of LIBs. But the ionic radius of Na+ (10.3 nm) is larger than that of Li+ (7.1 nm) which makes its diffusion rate slower and also needs host materials with larger interlayer spacing[10]. There has been less success in finding a very good and efficient anode for SIBs[11]. So, there is a need for fabricating anodes with high initial coulombic efficiency (ICE), high cycling stability and a low charge/discharge potential plateau etc.
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Syed Ali Riza, Xu Ri-gan, Liu Qi, Muhammad Hassan, Yang Qiang, Mu Dao-bin, Li Li, Wu Feng, Chen Ren-jie (2024). A review of anode materials for sodium ion batteries. New Carbon Materials. https://doi.org/10.1016/S1872-5805_N
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Frequently Asked Questions
What are sodium ion batteries (SIBs) and why are they important?
Sodium ion batteries are a type of rechargeable battery that uses sodium ions as charge carriers. They are important because sodium is abundant and inexpensive, making SIBs a promising, cost-effective alternative to lithium-ion batteries for large-scale energy storage.
What are the main types of anode materials for sodium ion batteries?
The main types include carbon-based materials (e.g., hard carbon, soft carbon), metallic compounds (e.g., oxides, sulfides), and organic materials. They operate via different mechanisms such as intercalation, alloying, and conversion.
What are the key challenges for sodium ion battery anodes?
Key challenges include the larger ionic radius of Na+ leading to slow diffusion, significant volume changes during cycling causing pulverization, and the formation of an unstable solid electrolyte interface (SEI), which can reduce capacity and cycling stability.
How can the performance of sodium ion battery anodes be improved?
Performance can be improved through strategies such as doping, coating, and structural modification of anode materials, as well as optimizing the solid electrolyte interface (SEI) to enhance initial coulombic efficiency, cycling stability, and rate capability.
What is the significance of this review on sodium ion battery anodes?
This review provides a comprehensive overview of the development, challenges, and prospects of various anode materials for SIBs, offering insights into current research trends and future directions for improving SIB technology.
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