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For the purpose of enhancing the cycling performance of LiMn2O4, the strategy of synergistic modification has been developed based on the simultaneous employment of the Al-Si co-doping and nano-rod micrograph. In addition, the preparation of LiMn1.92Al0.04Si0.04O4 nanorods can be conducted by a simple and low-cost two-step method due to hydrothermal reaction and subsequent process of lithiation. The Al-Si co-doping has positive effect on inhibiting the distortion effect of Jahn-Teller and strengthening the structural stability, and the nano-sized rod-like micrograph can further enhance the electrical conductivity. The results obtained from electrochemical test show that the comprehensive usage of Al-Si co-doping and nano-sized rod-like micrograph demonstrates the synergistic effect. In comparison with the undoped LiMn2O4 and LiMn1.92Al0.04Si0.04O4 particles, the LiMn1.92Al0.04Si0.04O4 nanorods are able to show more excellent cycling performance and it can present higher capacity retention of 97.1% after 100 cycles when tested at 1.0 C. Especially, the LiMn1.92Al0.04Si0.04O4 nanorods can deliver a satisfactory reversible capacity of 95.1 mAh g with capacity retention of 89.3% after 100 cycles at 5.0 C under the circumstances of high temperature. It is shown by such excellent performance that the strategy of synergistic modification based on the simultaneous usage of the Al-Si co-doping and nano-rod micrograph is of great significance to developing the lithium manganate-based cathode material of high performance.

Excellent cycling performance of LiMn1.92Al0.04Si0.04O4 nanorods as cathode material for lithium-ion battery