Rechargeable lithium-ion batteries (LIBs) are critical for enabling sustainable electrochemical energy storage. The capacity of cathode materials is a major limiting factor in the LIB performance, and boron doping has emerged as an effective strategy for enhancing the electrochemical properties of nickel-rich layered oxides such as NCM811. In this study, boron was successfully incorporated onto a tetrahedral site of NCM811 through a co-precipitation method using a Couette-Taylor Flow Reactor (CTFR). The presence of 2 at. % boron occupying some of the lithium pathway’s tetrahedral sites does not hinder the smooth diffusion of Li+ within the material, as demonstrated by rate tests. The introduction of boron into tetrahedral sites induces an inductive effect on TM-O-B bonds, resulting in a reduction of TM-O covalency and strengthening the stability of the oxygen framework within the rhombohedral structure. As a consequence of boron incorporation, structural collapse is postponed and the release of oxygen is diminished. Consequently, these changes culminated in an enhancement of cycling performance, translating to an initial specific capacity of 210 mAh g-1 and a 95.3% capacity retention after 100 cycles. Based on these findings, it is believed that boron tetrahedral site doping can be universally applicable and serve as a valuable reference for future material research endeavours. The co-precipitation method used in the synthesis can be adapted for large-scale production, and therefore, opens up possibilities for the development of high-performance lithium ion batteries on an industrial scale.