The Effect of WC Doping on the Electrochemical Behavior of Nanosilicon/CMC/AB Composite Electrode
Silicon is the most attractive anode material of all known host materials for lithium ion batteries because of its high theoretical lithium-insertion capacity up to 4200 mAh g-1, but it is difficult to be applied for its poor cyclability caused by the mechanical invalidation for the insertion of lithium ions. Nanosilicon/CMC/AB composite electrodes doped with WC were prepared by ball milling. The effect of the structure transformation of the doped electrode on the electrochemical behavior was systematically analyzed by X-ray diffraction. The mechanical properties of doped silicon electrode play an important role on its long-term electrochemical stability. The capacity retention could be maintained about 90% after 40 cycles. It was demonstrated that the cycling stability of the nanosilicon composite electrode could get a great promotion by WC doping. The intensification of the mechanical properties is critical to enhance the performance of the composite electrode.
Liangchi Zhang, Chunliang Zhang and Zichen Chen
Z. S. Wen et al., "The Effect of WC Doping on the Electrochemical Behavior of Nanosilicon/CMC/AB Composite Electrode", Advanced Materials Research, Vols. 328-330, pp. 1585-1588, 2011