相关链接
联系方式
  • 通信地址: 深圳市南山区西丽大学城清华园区
  • 邮编:200444
  • 电话:19821215236
  • 传真:
  • Email:huangsf@yzu.edu.cn
当前位置:> 首页 > 精彩瞬间 > 正文
恭喜吕姚博士B改性高镍正极发表于国际著名期刊Journal of power sources



Ni-rich layered oxide material with high theoretical capacity and low cost is one of the most promising cathode

candidates  for  high-energy-density  lithium-ion  battery.  However,  increase  of  Ni  content  triggers  structural

instability and fast capacity degradation, which severely impedes the practical application of Ni-rich materials.

Here, a surface dual-modification layer of B2O3 & LiBO2 is introduced to Ni-rich material LiNi0.89Co0.08Mn0.03O2

(NCM89), which successfully stabilizes  the  layered structure of NCM89 during cycling as well as removes re-

sidual lithium in NCM89. The in-situ X-ray diffraction and cross-sectional scanning electron microscopy results

demonstrate effectively improved structural reversibility and stability of the cathode. Moreover, the dissolution

of transition metals and decomposition of electrolyte at the cathode/electrolyte interface are successfully sup-

pressed, resulting in beneficial cathode electrolyte interphase (CEI) layer. As a result, the boron modified cathode

exhibits s a high capacity of 180.4mAh g  1

along with an excellent capacity retention of 90% after 100 cycles at

1C in 2.75–4.35 V at 25

?

C, while the pristine NCM89 cathode only retains 59% of its initial capacity after 100

cycles. Furthermore, the capacity retention of full cell after 350 cycles is improved from 52.5% to 90%.