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%.