Preparation method and purpose for iron oxide-based anode material for lithium ion battery
A technology for ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of cycle performance degradation, limited practical application, low conductivity, etc., and achieve improved cycle stability, good electrochemical performance, cycle The effect of excellent stability
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[0020] The preparation method of iron oxide-based lithium ion battery anode material includes the following steps:
[0021] 1) Dissolve the iron salt precursor in water, mix thoroughly and add the combustion agent. The molar ratio of combustion agent to iron ion is 0.5:1~4:1. After mixing well, add ammonia water to adjust the pH of the solution to 6.5~7.5 ;
[0022] 2) Put the solution in a water bath to heat and evaporate, the temperature is constant at 70-100 ℃, and continue to stir for 1 to 4 hours until a viscous gel is formed;
[0023] 3) Put the gel in a muffle furnace preheated to 200~500℃ for combustion reaction. After combustion reaction, keep it for 1 hour to obtain Fe 2 O 3 Powder
[0024] 4) Add Fe 2 O 3 The powder and the organic carbon source are ground and mixed in a mass ratio of 1:0.01~1:1, then placed in a tube furnace, heat treated in an argon atmosphere at 400~800℃ for 1~10 hours to obtain Fe 3 O 4 / C composite material, in which carbon accounts for Fe 3 O 4 The ma...
Example Embodiment
[0027] Example 1
[0028] 1) Dissolve ferric nitrate in water, mix thoroughly and add citric acid. The molar ratio of citric acid to iron ion is 2:1. After mixing thoroughly, add ammonia to adjust the pH of the solution to 7;
[0029] 2) Put the solution in a water bath to heat and evaporate, the temperature is constant at 80 ℃, and continue to stir for 1 to 4 hours until a viscous gel is formed;
[0030] 3) Put the gel in a muffle furnace preheated to 500°C for combustion reaction. After the combustion reaction, keep it for 1 hour to obtain fluffy Fe 2 O 3 Powder
[0031] From figure 1 Fe prepared in Example 1 2 O 3 The X-ray diffraction pattern of the powder shows that the position of the diffraction peak of the sample is consistent with that of Fe in the standard spectrum. 2 O 3 (JCPDS No33-0664) The diffraction peak positions are consistent, which proves that the prepared Fe is pure 2 O 3 phase.
[0032] figure 2 Is the Fe prepared in Example 1 2 O 3 The scanning electron microgra...
Example Embodiment
[0036] Example 2
[0037] 1) Dissolve ferric nitrate in water, mix thoroughly and add citric acid. The molar ratio of citric acid to iron ion is 2:1. After mixing thoroughly, add ammonia to adjust the pH of the solution to 7;
[0038] 2) Put the solution in a water bath to heat and evaporate, the temperature is constant at 80 ℃, and continue to stir for 1 to 4 hours until a viscous gel is formed;
[0039] 3) Put the gel in a muffle furnace preheated to 500°C for combustion reaction. After the combustion reaction, keep it for 1 hour to obtain fluffy Fe 2 O 3 Powder
[0040] 4) Add Fe 2 O 3 The powder and sucrose are ground and mixed according to the mass ratio of 1:0.6, then placed in a tube furnace, and heat treated in an argon atmosphere at a temperature of 500℃ for 2 hours. The sucrose undergoes incomplete combustion and reduces Fe 2 O 3 , Get Fe 3 O 4 / C composite material, in which carbon accounts for Fe 3 O 4 The mass fraction of / C is 13.34%.
[0041] From Figure 4 Fe prepared in...
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