## 3 Results
### Electrochemical Properties  
The cyclic voltammetry (CV) of PVDF@Sb\({}_{2}\)O\({}_{3}\) and CMC@Sb\({}_{2}\)O\({}_{3}\) electrode at a scan rate of 0.2 mV s\({}^{-1}\) between 0.01 V and 3 V was depicted in Figure 3a,b. Both PVDF@Sb\({}_{2}\)O\({}_{3}\) and CMC@Sb\({}_{2}\)O\({}_{3}\) electrodes have similar curves so that the cathodic peaks located at about 1 V could be assigned to the lithiation of Sb\({}_{2}\)O\({}_{3}\) (6 Li\({}^{+}\) + Sb\({}_{2}\)O\({}_{3}\) +6e\({}^{-}\)\(\rightarrow\) 2 Sb + 3 Li\({}_{2}\)O) during the first cycle [23; 46], and the following reduction peaks at about 0.6 V may be associated with the multi-step lithiation of Sb (6 Li\({}^{+}\) + 2 Sb + 6e\({}^{-}\)\(\rightarrow\) 2 Li\({}_{3}\)Sb). The shift from \(\sim\)0.8 V to \(\sim\)1.5 V in the subsequent reduction peaks show an activation procedure in the initial lithium-ion insertion process [23]. As for oxidation peaks, the peaks centered at about 1.2 V and 1.5 V may be caused by de-alloying process (2 Li\({}_{3}\)Sb \(\rightarrow\) 6 Li\({}^{+}\) + 2 Sb + 6e\({}^{-}\)). As for the CV curves of CMC-FA@Sb\({}_{2}\)O\({}_{3}\) electrode in Figure 3c, some characteristic peaks were detected where the triangle notation in the figure was caused by lithiation and delithiation process as described above. In addition, those extra reduction peaks and distorted oxidation peaks may be attributed to some side reactions under the effect of CMC-FA polymer network. Figure 2: (**a**) The schematic of esterification reaction between CMC and FA; (**b**) FTIR spectra of FA, CMC and CMA-FA polymer network. As the Figure 3d-f shows, the lithiation/delithiation plateaus of the PVDF@Sb\({}_{2}\)O\({}_{3}\), CMC@Sb\({}_{2}\)O\({}_{3}\) and CMC-FA@Sb\({}_{2}\)O\({}_{3}\) at 0.2 A g\({}^{-1}\), were nearly consistent with the peaks in the cyclic voltammetry curve. The initial discharge capacity of CMC-FA@Sb\({}_{2}\)O\({}_{3}\) is 1315.8 mAh g\({}^{-1}\), which is higher than PVDF@Sb\({}_{2}\)O\({}_{3}\) (1236 mAh g\({}^{-1}\)) and CMC@Sb\({}_{2}\)O\({}_{3}\) (1141.3 mAh g\({}^{-1}\)). The initial coulombic efficiency of PVDF@Sb\({}_{2}\)O\({}_{3}\), CMC@Sb\({}_{2}\)O\({}_{3}\) and CMC-FA@Sb\({}_{2}\)O\({}_{3}\) is 72.73%, 70.24% and 60.09%, respectively. The low coulombic efficiency of three electrodes may be attributed to a form of SEI and conversion reaction of Sb\({}_{2}\)O\({}_{3}\)[47]. In addition, the charge-discharge curves in the second to fifth cycles of CMC-FA@Sb\({}_{2}\)O\({}_{3}\) overlapped obviously, while the curves of PVDF@Sb\({}_{2}\)O\({}_{3}\) and CMC@Sb\({}_{2}\)O\({}_{3}\) dispersed, indicating that electrodes will have higher cycling stability with the CMC-FA polymer network. The cycling performances of PVDF@Sb\({}_{2}\)O\({}_{3}\), CMC@Sb\({}_{2}\)O\({}_{3}\) and CMC-FA@Sb\({}_{2}\)O\({}_{3}\) as anode materials at current density of 0.2 A g\({}^{-1}\) were depicted in Figure 4a. During the first 50 cycles, the specific discharge capacity of CMC-FA@Sb\({}_{2}\)O\({}_{3}\) gradually decreases to 400.5 mAh g\({}^{-1}\), which may be attributed to some side reactions during the discharge stage of CMC-FA@Sb\({}_{2}\)O\({}_{3}\) electrode (CMC-FA polymer binder has residual hydroxyl group, which may react with PF\({}_{5}\) in electrolyte) [38]. From the 50 th cycle, the discharge curve CMC-FA@Sb\({}_{2}\)O\({}_{3}\) goes upward, after 200 cycles, the specific discharge capacity of CMC-FA@Sb\({}_{2}\)O\({}_{3}\) gradually increases to 611.4 mAh g\({}^{-1}\). The upward trend may be attributed to the activation of CMC-FA@Sb\({}_{2}\)O\({}_{3}\) electrode, some active sites were covered for the reason of as-prepared Sb\({}_{2}\)O\({}_{3}\) particles are easily aggregate, which we have discussed in SEM image and Nitrogen adsorption-desorption isotherms measurement of Sb\({}_{2}\)O\({}_{3}\) particle. Changes in the volume of Sb\({}_{2}\)O\({}_{3}\) particle during lithiation/delithiation may lead to exposure of new active sites and result in capacities increasing.