Molten Salt Derived Graphene-Like Carbon Nanosheets Wrapped SiOx/Carbon Submicrospheres with Enhanced Lithium Storage

• 作者: Qianliang Zhang Suping Han Fang Tian Zhenyu Feng Baojuan Xi Shenglin Xiong Yitai Qian
• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: Concise Reports
• 页码范围: 1233-1239
• 页数: 7页
• 语种: 英文
• DOI: 10.1002/cjoc.202000647

摘要

Main observation and conclusion There is no doubt that SiOx and carbon composite is one of the promising anode materials for lithium-ion batteries owing to its high capacity and rational cycling stability.Herein,we report a sol-gel synthesis followed by molten salt carbonization route to fabricate graphene-like carbon nanosheet wrapped SiOx/C submicrospheres (SiOx/C@2D-C).The in-situ generated carbon nanosheets under molten salt condition can further improve the electroconductivity,restrain the volumetric expansion and guarantee the structural in-tegrity of the electrode.As a result,the as-obtained SiOx/C@2D-C delivers a discharge capacity of 559 mAh·g-1 at 0.5 A·g-1 after 200 cycles and 548 mAh·g-1 at 1.0 A·g-1 even after 1000 cycles.The full cell assembled with SiOx/C@2D-C as anode and commercial LiFePO4 as cathode can achieve an energy density of 200 Wh·kg-1 and maintain a capacity of 66.7％ after 100 cycles with a working potential of 2.8 V.The approach is simple and cost effective,which is promising for mass production of SiOx-based materials for high energy LIBs.