Tuning Cobalt-Free Nickel-Rich Layered LiNi_0.9Mn_0.1O₂ Cathode Material for Lithium-Ion Batteries

As the demand for high-energy-density batteries becomes more and more urgent, cathode materials of high-energy lithium-ion batteries have received widespread attention. LiNi_xCo_yMn_1-x-yO₂ (NCM) ternary materials with high nickel and low cobalt content as well as a high cut-off voltage are continually pursued. Here, a nickel-rich cobalt-free cathode material, LiNi_0.9Mn_0.1O₂, was synthesized by using a co-precipitation method to achieve a stable structure and excellent electrochemical performance. It shows a discharge specific capacity of 190 mAhg⁻¹ in the first cycle at a rate of 0.2 C, and a capacity retention of 93 % over 150 cycles at 2.7–4.3 V. It also exhibits excellent electrochemical performance under high cut-off voltage. The initial discharge specific capacity reaches 197.5 mAhg⁻¹ at 0.2 C within 2.7 to 4.5 V, and the capacity retains 188.9 mAhg⁻¹ after 100 cycles. The work provides an alternative cathode material for high-energy-density and cost-effective lithium-ion batteries.