Journal
NATIONAL SCIENCE REVIEW
Volume 8, Issue 2, Pages -Publisher
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwaa150
Keywords
lithium-oxygen batteries; dendrite suppression; Li anodes; hybrid solid electrolyte; LAGP; PVDF-HFP
Categories
Funding
- National Key R&D Program of China [2017YFA0206700]
- National Natural Science Foundation of China [21725103, 51472232, 51522101, 51471075, 51631004, 21771013, 51522202]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09010404]
- Technology and Industry for National Defence of the People's Republic of China [JCKY2016130B010]
- Programme of Introducing Talents of Discipline to Universities [B14009]
- Program for the JLU Science and Technology Innovative Research Team [2017TD-09]
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A new HSE with a LAGP core and PVDF-HFP shell has been developed to address dendrite growth in Li-O-2 batteries, providing high modulus and uniform Li+ distribution for improved performance and long cycling stability.
The dendrite growth of Li anodes severely degrades the performance of lithium-oxygen (Li-O-2) batteries. Recently, hybrid solid electrolyte (HSE) has been regarded as one of the most promising routes to tackle this problem. However, before this is realized, the HSE needs to simultaneously satisfy contradictory requirements of high modulus and even, flexible contact with Li anode, while ensuring uniform Li+ distribution. To tackle this complex dilemma, here, an HSE with rigid Li1.5Al0.5Ge1.5(PO4)(3) (LAGP) core@ultrathin flexible poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) shell interface has been developed. The introduced large amount of nanometer-sized LAGP cores can not only act as structural enhancer to achieve high Young's modulus but can also construct Li+ diffusion network to homogenize Li+ distribution. The ultrathin flexible PVDF-HFP shell provides soft and stable contact between the rigid core and Li metal without affecting the Li+ distribution, meanwhile suppressing the reduction of LAGP induced by direct contact with Li metal. Thanks to these advantages, this ingenious HSE with ultra-high Young's modulus of 25 GPa endows dendrite-free Li deposition even at a deposition capacity of 23.6 mAh. Moreover, with the successful inhibition of Li dendrites, the HSE-based quasi-solid-state Li-O-2 battery delivers a long cycling stability of 146 cycles, which is more than three times that of gel polymer electrolyte-based Li-O-2 battery. This new insight may serve as a starting point for further designing of HSE in Li-O-2 batteries, and can also be extended to various battery systems such as sodium-oxygen batteries.
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