Nanostructured Electrode Materials for Rechargeable Lithium-Ion Batteries

Zhao, Wei; Choi, Woosung; Yoon, Won‐Sub

doi:10.33961/jecst.2020.00745

Cited by 33 publications

(21 citation statements)

References 184 publications

(220 reference statements)

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“…The simultaneous use of cation and anionic redox reactions in Li-rich layered oxides (LRLOs) results in high energy densities (≈1100 Wh kg −1 ) far exceeding those of conventional stoichiometric layered oxides, LiMO 2 (≈800 Wh kg −1 ), in Li-ion batteries (LIBs). [1][2][3][4][5][6] However, LRLOs generally suffer from undesired disordering. [13][14][15] It is therefore essential to design novel LRLOs with the capability to stabilize oxidized oxygen species without significant TM migration and to hold the oxygen anions with sufficient TMO covalency to improve the practical feasibility of Li 1+x M 1−x O 2 .…”

Section: Introductionmentioning

confidence: 99%

Selective Anionic Redox and Suppressed Structural Disordering Enabling High‐Energy and Long‐Life Li‐Rich Layered‐Oxide Cathode

Ahn

Kang

Cho

et al. 2021

Advanced Energy Materials

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phase transitions to spinel-like or rocksaltlike disordered structures caused by the irreversible migration of transition-metal (TM) ions into the Li layers during longterm battery operation. The structural evolution continuously shuffles the chemical potential of Li ions and impedes Li-ion hopping, resulting in gradual voltage decay and poor cycle life.A predominant theory of the origin of TM migration emphasizes the ability of the material to stabilize oxygen holes and inhibit oxygen release, which increases with the covalency of the TMO bond. When using a 4d TM instead of a 3d TM, the enhanced covalency between the TM and O enables the reversible anionic redox. [2,[7][8][9] For example, Li 2 RuO 3 reversibly exhibits high capacity of the cationic and anionic redox couples and releases a negligible amount of O 2 gas. [10] Nevertheless, significant voltage decay is observed for Li 2 RuO 3 , which stems from the accumulation of Ru cations in the Li layers, [11,12] indicating that the ability to hold oxygen in its lattice does not necessarily inhibit TM migration. Recently, Chueh and co-workers proposed a thermodynamic explanation for the coupling between the anionic redox and TM migration, which is that the oxidized oxygen anions favor less coordination with TM cations; this is achievable via structural Despite their high energy densities, Li-rich layered oxides suffer from low capacity retention and continuous voltage decay caused by the migration of transition-metal cations into theLi layers. The cation migration stabilizes oxidized oxygen anions through the decoordination of oxygen from the metal once the anions participate in the redox reaction. Structural disordering is thus considered inevitable in most Li-rich layered oxides. However, herein, a Mg-substituted Li-rich layered oxide, Li 1.2 Mg 0.2 Ru 0.6 O 2 , with high structural and electrochemical stability is presented. Although using both cationic and anionic redox reactions, Ru migration in Li 1.2−x Mg 0.2 Ru 0.6 O 2 is thermodynamically unfavored as a result of selectively oxidized O ions, suppressed structural disordering, and the formation of short (1.75 Å) Ru=O bonds enabled within the layered framework, which effectively decoordinate the oxidized O ions. The unprecedentedly high structural stability of Li 1.2 Mg 0.2 Ru 0.6 O 2 leads to not only a high energy density of 964 Wh kg −1 but also outstanding rate capability and cycle performance. These findings demonstrate the potential of this practical strategy for the stabilization of Li-rich layered oxides even with prolonged cycling.

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Section: Introductionmentioning

confidence: 99%

Selective Anionic Redox and Suppressed Structural Disordering Enabling High‐Energy and Long‐Life Li‐Rich Layered‐Oxide Cathode

Ahn

Kang

Cho

et al. 2021

Advanced Energy Materials

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“…Thus, the cyclability and rate capability of carbon composite materials are greater than those of bare materials because of the enhanced kinetic properties and stable carbonaceous matrix during ion repeated storage/extraction cycles [157][158][159][160][161]. In addition to the cycle and rate performance, carbon composite materials generally exhibit higher capacity than pure active materials or pure carbonaceous materials [39,69,162]. This improvement in capacity is called a synergistic effect, originating from the intimate contact between carbon and active materials.…”

Section: Nanoscale Engineeringmentioning

confidence: 99%

Challenges and Design Strategies for Conversion-Based Anode Materials for Lithium- and Sodium-Ion Batteries

Kim

Yoon

2022

J. Electrochem. Sci. Technol

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Although lithium-ion batteries are currently the most reliable power supply system for various mobile applications, further improvement in energy density is still required as the need for batteries in large energy-consuming devices is rapidly growing. However, in the anode, the most widely commercialized graphite-based anode materials almost face theoretical limitations. In addition, sodium-ion batteries have been actively studied to replace expensive charge carriers with cheaper ones. Accordingly, conversion-based materials have been extensively studied as high-capacity anode materials in both lithiumion batteries and sodium-ion batteries because their theoretical capacity is twice or thrice higher than that of insertion-based materials. This review will provide a comprehensive understanding of conversion-based materials, including basic charge storage behaviors, critical drawbacks that should be overcome, and practical material design for high-performance.

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“…During discharge, the lithium atoms are oxidized to lithium ions and transported through the electrolyte to the cathode. Due to the insertion of lithium atoms in graphite (at the time of charging), these materials are called intercalation anodes [6][7][8][9][10][11][12][13][14]. According to Fig.…”

Section: Introductionmentioning

confidence: 99%

“…2, among alloy anodes, silicon has the highest volume and weight capacity, is found in abundance in nature, and the entire electronics industry is based on silicon; Thus, as Fig. 2 shows, silicon is the most important of the alloy anodes [12][13][14][15]. Therefore, most of the material in this article is about silicon, but the principles mentioned can be generalized to other alloy anodes.…”

Section: Introductionmentioning

confidence: 99%

Nano and Battery Anode: A Review

Majdi¹,

Latipov

Борисов

et al. 2021

Nanoscale Res Lett

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Improving the anode properties, including increasing its capacity, is one of the basic necessities to improve battery performance. In this paper, high-capacity anodes with alloy performance are introduced, then the problem of fragmentation of these anodes and its effect during the cyclic life is stated. Then, the effect of reducing the size to the nanoscale in solving the problem of fragmentation and improving the properties is discussed, and finally the various forms of nanomaterials are examined. In this paper, electrode reduction in the anode, which is a nanoscale phenomenon, is described. The negative effects of this phenomenon on alloy anodes are expressed and how to eliminate these negative effects by preparing suitable nanostructures will be discussed. Also, the anodes of the titanium oxide family are introduced and the effects of Nano on the performance improvement of these anodes are expressed, and finally, the quasi-capacitive behavior, which is specific to Nano, will be introduced. Finally, the third type of anodes, exchange anodes, is introduced and their function is expressed. The effect of Nano on the reversibility of these anodes is mentioned. The advantages of nanotechnology for these electrodes are described. In this paper, it is found that nanotechnology, in addition to the common effects such as reducing the penetration distance and modulating the stress, also creates other interesting effects in this type of anode, such as capacitive quasi-capacitance, changing storage mechanism and lower volume change.

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Nanostructured Electrode Materials for Rechargeable Lithium-Ion Batteries

Cited by 33 publications

References 184 publications

Selective Anionic Redox and Suppressed Structural Disordering Enabling High‐Energy and Long‐Life Li‐Rich Layered‐Oxide Cathode

Selective Anionic Redox and Suppressed Structural Disordering Enabling High‐Energy and Long‐Life Li‐Rich Layered‐Oxide Cathode

Challenges and Design Strategies for Conversion-Based Anode Materials for Lithium- and Sodium-Ion Batteries

Nano and Battery Anode: A Review

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