Premium
Phosphorus and Boron Co‐Doped Carbon Coating of LiNi 0.5 Mn 1.5 O 4 Cathodes for Advanced Lithium‐ion Batteries
Author(s) -
Gu Tingting,
Wang Jin,
Tian JingHua,
Zheng Xiangjun,
Lu Kewei,
Xin Yu,
Wang Haibo,
Yang Ruizhi
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900411
Subject(s) - materials science , boron , electrolyte , lithium (medication) , coating , cathode , dielectric spectroscopy , carbon fibers , electrochemistry , doping , dissolution , inorganic chemistry , phosphorus , chemical engineering , composite number , electrode , nanotechnology , metallurgy , chemistry , composite material , optoelectronics , organic chemistry , engineering , endocrinology , medicine
A facile approach for the preparation of phosphorus and boron co‐doped carbon coated LiNi 0.5 Mn 1.5 O 4 , which is then applied as cathode materials for lithium ion batteries has been investigated. The effect of carbon coating amounts on the battery performance has been studied systematically. The 5 wt.% carbon coated sample exhibits the most outstanding performance, including an excellent capacity retention of 96.7 % after 200 cycles, superior rate capability (111 mAh g −1 capacity at 5 C), and significantly improved cycle life under 1 C. It is believed that the phosphorus and boron co‐doped carbon coating layer could suppress side‐reactions between the electrolyte and LiNi 0.5 Mn 1.5 O 4 , and alleviate the dissolution of manganese ions into the electrolyte effectively. Moreover, electrochemical impedance spectroscopy results reveal that the phosphorus and boron co‐doped carbon coating on LiNi 0.5 Mn 1.5 O 4 could reduce the charge transfer resistance significantly. The composite cathode therefore provides good conductivity as well as fast Li‐ion diffusion, then resulting in better rate capability and cycle life, even under a high temperature of 55 °C.