Enhanced Electrochemical Performance of LiNi0.6Co0.2Mn0.2O2 by a Negative‐Thermal‐Expansion Material at Elevated Temperature

More measures are being developed to enhance the electrochemical stability of single‐crystal LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622), but few focus on improving the stability of NCM622 through heat and deformation management. Herein, a negative‐thermal‐expansion (NTE) material of zirconium tungstate ZrW 2 O 8 is adopted to modify NCM622 via a facile method, and the sample with a proper content of ZrW 2 O 8 exhibits superior cycle performance and rate capability. The capacity retention ratio of modified NCM622 is 86.2% (from 193.6 to 166.8 mAh g −1 ) after 100 cycles at 2 C between 2.8 and 4.5 V at 60 °C, whereas that of the pristine NCM622 is only 77.5% (from 183.8 to 142.4 mAh g −1 ). According to various analysis results, the possible enhancing mechanisms of ZrW 2 O 8 for NCM622 are discussed. It is an alternative for the remaining good structure of energy materials using NTE materials.