Premium
A New Strategy to Effectively Suppress the Initial Capacity Fading of Iron Oxides by Reacting with LiBH 4
Author(s) -
Cao Yun,
Yang Yaxiong,
Ren Zhuanghe,
Jian Ni,
Gao Mingxia,
Wu Yongjun,
Zhu Min,
Pan Feng,
Liu Yongfeng,
Pan Hongge
Publication year - 2017
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201700342
Subject(s) - materials science , electrochemistry , nanocomposite , anode , chemical engineering , lithium (medication) , electrolyte , lithium ion battery , oxide , borohydride , electrode , nanotechnology , battery (electricity) , metallurgy , organic chemistry , chemistry , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering , catalysis
In this work, a new facile and scalable strategy to effectively suppress the initial capacity fading of iron oxides is demonstrated by reacting with lithium borohydride (LiBH 4 ) to form a B‐containing nanocomposite. Multielement, multiphase B‐containing iron oxide nanocomposites are successfully prepared by ball‐milling Fe 2 O 3 with LiBH 4 , followed by a thermochemical reaction at 25–350 °C. The resulting products exhibit a remarkably superior electrochemical performance as anode materials for Li‐ion batteries (LIBs), including a high reversible capacity, good rate capability, and long cycling durability. When cycling is conducted at 100 mA g −1 , the sample prepared from Fe 2 O 3 –0.2LiBH 4 delivers an initial discharge capacity of 1387 mAh g −1 . After 200 cycles, the reversible capacity remains at 1148 mAh g −1 , which is significantly higher than that of pristine Fe 2 O 3 (525 mAh g −1 ) and Fe 3 O 4 (552 mAh g −1 ). At 2000 mA g −1 , a reversible capacity as high as 660 mAh g −1 is obtained for the B‐containing nanocomposite. The remarkably improved electrochemical lithium storage performance can mainly be attributed to the enhanced surface reactivity, increased Li + ion diffusivity, stabilized solid‐electrolyte interphase (SEI) film, and depressed particle pulverization and fracture, as measured by a series of compositional, structural, and electrochemical techniques.