Journal
SMALL
Volume 18, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202107365
Keywords
fast-charging; lithium-ion batteries; long cycling life; nano-blocks; Nb; W-14; O-3; (44)
Categories
Funding
- National Natural Science Foundation of China [51832004, 21905218, 51521001]
- Natural Science Foundation of Hubei Province [2019CFA001, 2020CFB519]
- National Key Research and Development Program of China [2020YFA0715000]
- Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory [XHT2020-003]
- Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City [520LH055]
- Sanya Science and Education Innovation Park of Wuhan University of Technology [2020KF0019]
- Fundamental Research Funds for the Central Universities [WUT: 2020IVB034, 2020IVA036, 2021CG014]
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The increasing demand for electric vehicles and smart grids has greatly improved the comprehensive function of lithium-ion batteries (LIBs). However, the commercial graphite used as an important part of LIBs is not suitable for fast-charging due to its sluggish Li+ diffusion rate, thermal runway, and volume expansion. Here, nano-sized Nb14W3O44 blocks are synthesized as a fast-charge anode material, which provides a shorter Li+ diffusion pathway and accelerates the diffusion rate. The Nb14W3O44 exhibits excellent long-term cycling life and rate capability, and it is recognized as a promising fast-charge anode material for next-generation LIBs.
The further demand for electric vehicles and smart grids prompts that the comprehensive function of lithium-ion batteries (LIBs) has been improved greatly. However, due to sluggish Li+ diffusion rate, thermal runway and volume expansion, the commercial graphite as an important part of LIBs is not suitable for fast-charging. Herein, nano-sized Nb14W3O44 blocks are effectively synthesized as a fast-charge anode material. The nano-sized structure provides shorter Li+ diffusion pathway in the solid phase than micro-sized materials by several orders of magnitude, corresponding to accelerating the Li+ diffusion rate, which is beneficial for fast-charge characteristics. Consequently, Nb14W3O44 displays excellent long-term cycling life (135 mAh g(-1) over 1000 cycles at 10 C) and rate capability at ultra-high current density (approximate to 103.9 mAh g(-1), 100 C) in half-cells. In situ X-ray diffraction and Raman combined with scanning electron microscopy clearly confirms the stability of crystal and microstructure. Furthermore, the fabricated Nb14W3O44||LiFePO4 full cells exhibit a remarkable power density and demonstrate a reversible specific capacity. The pouch cell delivers long cycling life (the capacity retention is as high as 96.6% at 10 C after 5000 cycles) and high-safety performance. Therefore, nano-sized Nb14W3O44 could be recognized as a promising fast-charge anode toward next-generation practical LIBs.
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