Abstract
Fluorinated carbon (CFx) is a new material with good lubricity and resistance to high temperature and corrosion. Meanwhile, CFx has excellent electrochemical properties when used as the cathode of the lithium primary batteries. Here, a series of carbon molecular sieve (CMS) is fluorinated via gas-phase fluorination. The CMS treated at 1550 °C has better electrochemical properties after fluorination. The fluorinated products named CMSF deliver specific capacity reaching 796 mAh g-1, associated with discharge potentials exceeding 3.1 V (vs. Li/Li+). The discharge voltage of CMSF is about 0.4 V ~ 0.6 V higher than that of fluorinated graphite (GF), and its energy density is about 8% ~ 13% higher than that of GF. The CMSF with the better electrochemical performances than GF as well as its low cost and scalable product demonstrated its great potential practicability in the field of lithium primary batteries.
Highlights
Due to the advantages of large theoretical energy densities, wide temperature range, good stability, high security and long life, lithium/fluorinated carbon (Li/CFx) batteries, which have been developed since 1970s, are widely used in portable electronic equipment, electronic instruments, chip memory power supply, embedded medical devices, etc. [1]
Carbon molecular sieves (CMS) obtained by carbonization and activation of coal, wood, fruit shell, petroleum coke and carbon fiber, contain some impurities. These impurities will reduce the content of electroactive substances in fluorinated carbon molecular sieves (CMSF)
The carbon molecular sieves (CMS) used in the experiment have a large number of impurities, which affect the discharge performance of fluorinated carbon molecular sieves (CMSF)
Summary
Due to the advantages of large theoretical energy densities, wide temperature range, good stability, high security and long life, lithium/fluorinated carbon (Li/CFx) batteries, which have been developed since 1970s, are widely used in portable electronic equipment, electronic instruments, chip memory power supply, embedded medical devices, etc. [1]. In order to improve the discharge performance of fluorinated carbon, man efforts have been made to improve the electrical conductivity and the power density of the material including controlled fluorination, surface coating and thermal cracking technology [4,5,6]. Another direction of research on fluorinated carbon used in chemical power sources is to find a suitable carbon material for fluorination in order to obtain fluorinated materials with better performance [3]. A simple method of thermal decomposition was used to treat the carbon mo1ecular sieves, and the structure and electrochemical properties of the products obtained from the fluorination of these carbon sources were analysed
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