Journal
ADVANCED MATERIALS
Volume 34, Issue 18, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202109356
Keywords
fast-charging electrode; ion transportation pathway; lithium-ion batteries; lithium titanate; mesoporous single-crystalline structure
Categories
Funding
- Central Program of Basic Science of the National Natural Science Foundation of China [72088101]
- National Key Research and Development Program of China [2017YFA0206703]
- National Natural Science Foundation of China [51902304, 52072358]
- Anhui Provincial Natural Science Foundation [1908085ME122]
- Fundamental Research Funds for the Central Universities [Wk2060140026]
- R&D Department of PetroChina
- National Natural Science Fund for Innovative Research Groups (China) [51621003]
- Beijing municipal high-level innovative team building program [IDHT20190503]
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This study reports on the exceptional fast charge/discharge performance and long-term stability of a mesoporous single-crystalline lithium titanate (MSC-LTO) microrod in lithium-ion batteries (LIBs). The microrods exhibit high rate capability and minimal structure degradation, providing a new approach for developing fast-charging materials for LIBs.
There remain significant challenges in developing fast-charging materials for lithium-ion batteries (LIBs) due to sluggish ion diffusion kinetics and unfavorable electrolyte mass transportation in battery electrodes. In this work, a mesoporous single-crystalline lithium titanate (MSC-LTO) microrod that can realize exceptional fast charge/discharge performance and excellent long-term stability in LIBs is reported. The MSC-LTO microrods are featured with a single-crystalline structure and interconnected pores inside the entire single-crystalline body. These features not only shorten the lithium-ion diffusion distance but also allow for the penetration of electrolytes into the single-crystalline interior during battery cycling. Hence, the MSC-LTO microrods exhibit unprecedentedly high rate capability, achieving a specific discharge capacity of approximate to 174 mAh g(-1) at 10 C, which is very close to its theoretical capacity, and approximate to 169 mAh g(-1) at 50 C. More importantly, the porous single-crystalline microrods greatly mitigate the structure degradation during a long-term cycling test, offering approximate to 92% of the initial capacity after 10 000 cycles at 20 C. This work presents a novel strategy to engineer porous single-crystalline materials and paves a new venue for developing fast-charging materials for LIBs.
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