通过探讨磷酸氢二铵作为掺杂剂时，发现剑麻纤维炭与其质量比为1:4时，制

Through the discussion of diammonium hydrogen phosphate as a dopant, it was found that when the ratio of sisal fiber carbon to its mass is 1: 4, the prepared N, P-SFAC is the best, with a thin and porous morphology structure, higher Specific capacity, when the current density is 100mA / g, after 30 cycles, the specific capacity is maintained in a relatively stable state, which is 425mAh / g; <br>by discussing ammonium phosphate as a dopant, the ratio of sisal fiber carbon to its mass is found When it is 1: 4, the prepared N, P-SFAC is better, with a smaller impedance of 38Ω, after 30 cycles, it has a higher and relatively stable specific capacity of 355mAh / g; <br>by discussing phosphoric acid When ammonium dihydrogen was used as the dopant, it was found that when the ratio of sisal fiber carbon to its mass is 1: 4, the prepared N, P-SFAC is the best, with a honeycomb-like morphological structure, the sheet is porous and thin , The impedance is small, 40Ω, indicating that its conductivity is good, and its maximum specific capacity is up to 1400mAh / g. After the current density is 100mA / g, after 30 cycles, the specific capacity is still in a relatively stable and high position. It is 425mAh / g, indicating that it has good cycle stability. <br>By comparing the morphology and characterization of N, P-SFAC prepared by the three dopants and the best mass ratio, it is concluded that the best dopant is ammonium dihydrogen phosphate, and the best mass ratio of SFAC to 1: 4, The prepared electrode material has the most excellent electrochemical performance, the specific capacity is up to 2100mAh / g, after 30 cycles, it still maintains the temperature at 861mAh / g, has the best cycle stability, and the first Coulomb efficiency is 55.3%; impedance Small, 48Ω, with good conductivity. <br>When the doping temperature is 950 ℃, the prepared N, P-SFAC is the best, its morphology structure, specific capacity, impedance, etc. are better than 750 ℃ ​​and 850 ℃.

By exploring diammonium phosphate as a doping agent, it was found that when the ratio of swords and hemp fiber charcoal to its mass was 1:4, the n, P-SFAC prepared was the best, with thin and porous shape structure, higher ratio capacity, in the current density of 100mA/g, after 30 cycles, its ratio capacity was maintained in a more stable state, 425mAh/g;<br>By exploring ammonium phosphate as a doping agent, it was found that when the ratio of sword hemp fiber carbon to its mass was 1:4, the n, P-SFAC prepared was better, with a smaller impedance, 38 o' clock, after 30 cycles, had a higher and relatively stable ratio capacity of 355mAh/g;<br>By exploring ammonium phosphate as a doping agent, it was found that when the ratio of swords and hemp fiber charcoal to its mass was 1:4, the preparation of N, P-SFAC was the best, with a beehive-like shape structure, flaky and thin, less impedance, 40 s, indicating that Its conductivity is better, its maximum ratio capacity of up to 1400mAh/g, in the current density of 100mA/g, after 30 times cycle, the ratio capacity is still in a relatively stable and higher position, 425mAh/g, indicating that it has better cycle stability.<br>By comparing the shape and characterof of the three doping agents and the optimal mass ratio of N and P-SFAC, it is concluded that the best doping agent is ammonium dihydrogen phosphate, the SFAC has the best mass ratio of 1:4, and the electrode material is prepared with the best electrochemical properties. Compared to capacity of up to 2100mAh/g, after 30 cycles, still maintain the temperature at 861mAh/g, with the best cycle stability, and the first Cullen efficiency of 55.3%;<br>The N, P-SFAC is the best prepared at the doped temperature of 950 degrees C, and its morphological structure, ratio capacity, impedance are better than 750 degrees C and 850 degrees C.

When the ratio of sisal fiber carbon to its mass ratio is 1:4, the prepared n, p-sfac is the best. It has thin and porous morphology and high specific capacity. After 30 cycles, the specific capacity of sisal fiber carbon is 425mah / g;<br>When the ratio of sisal fiber carbon to its mass ratio is 1:4, the prepared n, p-sfac has a smaller impedance, 38 Ω. After 30 cycles, it has a higher and relatively stable specific capacity, 355mah / g;<br>When the ratio of sisal fiber carbon to its mass ratio is 1:4, the prepared n, P-sfac is the best, with honeycomb like structure, porous and thin sheet, small impedance, 40 Ω, which shows that its conductivity is good, its maximum specific capacity is up to 1400mAh / g, in the current density of 100mA / g, after 30 cycles, the specific capacity is still in a relatively stable and high position, 425mah / g, which shows that it has good cycle stability.<br>By comparing the three dopants and the best mass ratio of n, The morphology and characterization of p-sfac show that the best dopant is ammonium dihydrogen phosphate, the best mass ratio of SFAC to SFAC is 1:4. The prepared electrode material has the best electrochemical performance, the specific capacity is as high as 2100mAh / g, after 30 cycles, it still keeps the temperature at 861mah / g, has the best cycle stability, and the first coulomb efficiency is 55.3%; the impedance is small, 48 Ω, has good conductivity.<br>When the doping temperature is 950 ℃, the prepared n, p-sfac is the best, and its morphology, specific capacity and impedance are better than 750 ℃ and 850 ℃.<br>