Xuanyi Zhou, Biao Zhang, Pengbo Lyu, Lei Xi, Fangkun Li, Zengsheng Ma, Min Zhu, Jun Liu
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引用次数: 0
Abstract
All-solid-state lithium batteries (ASSLBs) based on LiNi1-x-yCoxMnyO2 cathode suffer from rock-ribbed electrolyte-cathode interface issues such as oxygen escape and side reactions with electrolyte at high operating voltage, result in severe structure deterioration and rapid capacity decay. Herein, a kind of synergistic “catalytic conversion” integrated mechanisms is strategically exploited to in-situ construct steerable cathode-electrolyte interface (CEI), intending to synchronously elevate electrochemical and structural stability upon cycling. By employing functional polypyrrole (PPy) as coating layer on high voltage-operated LiNi0.8Co0.1Mn0.1O2 (NCM811), we unveils that the N-H bond of polypyrrole ring can product N-H…O hydrogen bonding interaction to alleviate oxygen evolution. Detailed, through hydrogen bonding, higher reductive O- despoil proton-H to form OH-. The resulting astray OH- together with O2- further coordinated with Li+ around the aromatic skeleton interrupted by nucleophilic π-π interaction, thereby promoting the in-situ generation of Li2O-LiOH rich CEI. Finally, the parasitic interfacial side reactions and oxygen evolution are considerably suppressed, enabling the NCM@PPy full cell an excellent cyclic performance with a capacity retention of 81.2% after 300 cycles. Such in-situ generated Li2O-LiOH rich CEI enables NCM811 cathode to achieve considerable capacity of 122 mAh·g-1 at 0.5C with operating voltage of 4.3 V and lifetime of more than 100 cycles, demonstrating the practical application potential in energy storage field.
期刊介绍:
Energy & Environmental Science, a peer-reviewed scientific journal, publishes original research and review articles covering interdisciplinary topics in the (bio)chemical and (bio)physical sciences, as well as chemical engineering disciplines. Published monthly by the Royal Society of Chemistry (RSC), a not-for-profit publisher, Energy & Environmental Science is recognized as a leading journal. It boasts an impressive impact factor of 8.500 as of 2009, ranking 8th among 140 journals in the category "Chemistry, Multidisciplinary," second among 71 journals in "Energy & Fuels," second among 128 journals in "Engineering, Chemical," and first among 181 scientific journals in "Environmental Sciences."
Energy & Environmental Science publishes various types of articles, including Research Papers (original scientific work), Review Articles, Perspectives, and Minireviews (feature review-type articles of broad interest), Communications (original scientific work of an urgent nature), Opinions (personal, often speculative viewpoints or hypotheses on current topics), and Analysis Articles (in-depth examination of energy-related issues).