Department of Chemical and Biological Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
Nuclear Fuel Cycle Process Development Division, Korea Atomic Energy Research Institute , 989-111 Daedeok-daero, Yuseong-gu, Daejeon 34057, Republic of Korea.
ACS Appl Mater Interfaces. 2017 Jun 7;9(22):18790-18798. doi: 10.1021/acsami.7b03456. Epub 2017 May 24.
Fluorocarbon (CF) anode materials were developed for lithium- and sodium-ion batteries through a facile one-step carbonization of a single precursor, polyvinylidene fluoride (PVDF). Interconnected carbon network structures were produced with doped fluorine in high-temperature carbonization at 500-800 °C. The fluorocarbon anodes derived from the PVDF precursor showed higher reversible discharge capacities of 735 mAh g and 269 mAh g in lithium- and sodium-ion batteries, respectively, compared to the commercial graphitic carbon. After 100 charge/discharge cycles, the fluorocarbon showed retentions of 91.3% and 97.5% in lithium (at 1C) and sodium (at 200 mA g) intercalation systems, respectively. The effects of carbonization temperature on the electrochemical properties of alkali metal ion storage were thoroughly investigated and documented. The specific capacities in lithium- and sodium-ion batteries were dependent on the fluorine content, indicating that the highly electronegative fluorine facilitates the insertion/extraction of lithium and sodium ions in rechargeable batteries.
通过对聚偏二氟乙烯（PVDF）单一前体的简便一步碳化，开发了用于锂离子和钠离子电池的全氟（CF）阳极材料。在 500-800°C 的高温碳化过程中，掺杂氟可产生具有互穿碳网络结构。与商业石墨碳相比，源自 PVDF 前体的全氟碳阳极在锂离子和钠离子电池中分别表现出更高的可逆放电容量，分别为 735 mAh g 和 269 mAh g。经过 100 次充放电循环后，在锂离子（在 1C 下）和钠离子（在 200 mA g 下）嵌入体系中，氟碳分别保持了 91.3%和 97.5%的容量。深入研究并记录了碳化温度对碱金属离子存储电化学性能的影响。锂离子和钠离子电池的比容量取决于氟含量，表明高电负性氟有利于可充电电池中锂离子和钠离子的插入/提取。
