LiNi_0.80Co_0.15Al_0.05O₂ (NCA) as a practical cathode material for lithium-ion batteries has been attracting extensive attention owing to its superior specific capacity and small voltage hysteresis, but suffers from the serious side reactions with electrolyte and HF erosion resulting in capacity fading. A thin conformal polysiloxane with ethoxy-functional groups (EPS) is successfully grown on NCA particles through the hydrolysis-condensation method effectively suppresses the side reactions and mitigates the instability of NCA cathode. The original discharge capacities of NCA and NCA-EPS cathodes are 158 and 159 mAh g⁻¹ at 25 °C, respectively. The capacity retention of NCA-EPS cathode is ~96% of the original capacity after 150 cycles under 1 C, 25% higher than NCA cathode. Even at 55 °C, NCA-EPS cathode could maintain ~86% of the original discharge capacity through 150 cycles, which enhances 29% compared to NCA cathode. The excellent cycling stability of NCA originates from the EPS that acts as a protective shell to reduce the trace water on the NCA surface, inhibit the side reaction and remove HF from the electrolyte through a nucleophilic substitution reaction.

LiNi _0.80 Co _0.15 Al _0.05 O ₂（NCA）作为锂离子电池的实用正极材料由于其比容量高和电压滞后小而受到了广泛的关注，但由于与电解液和HF腐蚀的严重副反应而产生容量下降。通过水解-缩合方法，一种具有乙氧基官能团（EPS）的薄保形聚硅氧烷成功地在NCA颗粒上生长，有效抑制了副反应并减轻了NCA阴极的不稳定性。NCA和NCA-EPS阴极的原始放电容量为158和159 mAh g ^-1分别在25°C下。在1 C下进行150次循环后，NCA-EPS阴极的容量保持率为原始容量的〜96％，比NCA阴极高25％。即使在55°C下，NCA-EPS阴极在150个循环中仍可保持约86％的原始放电容量，与NCA阴极相比提高了29％。NCA出色的循环稳定性源于EPS，EPS作为保护壳，可减少NCA表面的痕量水，抑制副反应并通过亲核取代反应从电解质中除去HF。