期刊
ADVANCED SCIENCE
卷 6, 期 14, 页码 -出版社
WILEY
DOI: 10.1002/advs.201802114
关键词
corrosion effect; doping; Li- and Mn-rich cathodes; lithium-ion batteries; stacking faults
资金
- National Key R&D Program of China [2016YFA0202602]
- National Natural Science Foundation of China [51871188, 21503178]
- Qinghai Province of China [2017-ZJ-750]
- Double-First Class Foundation of Materials and Intelligent Manufacturing Discipline of Xiamen University
The corrosion of Li- and Mn-rich (LMR) electrode materials occurring at the solid-liquid interface will lead to extra electrolyte consumption and transition metal ions dissolution, causing rapid voltage decay, capacity fading, and detrimental structure transformation. Herein, a novel strategy is introduced to suppress this corrosion by designing an Na+-doped LMR (Li1.2Ni0.13Co0.13Mn0.54O2) with abundant stacking faults, using sodium dodecyl sulfate as surfactant to ensure the uniform distribution of Na+ in deep grain lattices-not just surface-gathering or partially coated. The defective structure and deep distribution of Na+ are verified by Raman spectrum and high-resolution transmission electron microscopy of the as-prepared electrodes before and after 200 cycles. As a result, the modified LMR material shows a high reversible discharge specific capacity of 221.5 mAh g(-1) at 0.5C rate (1C = 200 mA g(-1)) after 200 cycles, and the capacity retention is as high as 93.1% which is better than that of pristine-LMR (64.8%). This design of Na+ is uniformly doped and the resultanting induced defective structure provides an effective strategy to enhance electrochemical performance which should be extended to prepare other advanced cathodes for high performance lithium-ion batteries.
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