Reactive boride infusion stabilizes Ni-rich cathodes for lithium-ion batteries
| Autor: | Kihong Ahn, Jaekyung Sung, Seok Ju Kang, Jaeseong Hwang, Ju Li, Yanhao Dong, Hyungyeon Cha, Jaephil Cho, Moonsu Yoon, Yimeng Huang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Energy Engineering and Power Technology 02 engineering and technology Electrolyte engineering.material 010402 general chemistry 01 natural sciences law.invention chemistry.chemical_compound Coating law Boride Cobalt boride Stress corrosion cracking Renewable Energy Sustainability and the Environment Intergranular corrosion 021001 nanoscience & nanotechnology Cathode 0104 chemical sciences Electronic Optical and Magnetic Materials Fuel Technology chemistry Chemical engineering engineering Wetting 0210 nano-technology |
| Zdroj: | Nature Energy. 6:362-371 |
| ISSN: | 2058-7546 |
| Popis: | Engineered polycrystalline electrodes are critical to the cycling stability and safety of lithium-ion batteries, yet it is challenging to construct high-quality coatings at both the primary- and secondary-particle levels. Here we present a room-temperature synthesis route to achieve a full surface coverage of secondary particles and facile infusion into grain boundaries, and thus offer a complete ‘coating-plus-infusion’ strategy. Cobalt boride metallic glass was successfully applied to a Ni-rich layered cathode LiNi0.8Co0.1Mn0.1O2. It dramatically improved the rate capability and cycling stability, including under high-discharge-rate and elevated-temperature conditions and in pouch full-cells. The superior performance originates from a simultaneous suppression of the microstructural degradation of the intergranular cracking and of side reactions with the electrolyte. Atomistic simulations identified the critical role of strong selective interfacial bonding, which offers not only a large chemical driving force to ensure uniform reactive wetting and facile infusion, but also lowers the surface/interface oxygen activity, which contributes to the exceptional mechanical and electrochemical stabilities of the infused electrode. Coating is commonly used to improve electrode performance in batteries, but it is challenging to achieve and maintain complete coverage of electrode particles during cycling. Here the authors present a coating-and-infusion approach on Ni-rich cathodes that effectively retards stress corrosion cracking. |
| Databáze: | OpenAIRE |
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