Preparation method of lithium iron borate
A technology of lithium iron borate and iron nitrate, applied in borates, chemical instruments and methods, boron compounds, etc., can solve problems such as easy absorption of moisture and oxygen, large specific surface area of products, and decline in product performance, and achieve capacity decay Low efficiency, good stability and small particle size
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[0029] Example 1
[0030] A preparation method of lithium iron borate includes the following steps:
[0031] (1) Pour the lithium borohydride solution and ferric nitrate solution into a sealed high-pressure reaction vessel, stir and react for 50 minutes at a temperature of 235°C and a pressure of 3 atmospheres, then release the pressure, and use ferrous hydroxide as the exported gas The slurry is absorbed, then aluminum citrate is added, stirred and mixed evenly, and then spray-dried to obtain a dry material;
[0032] (2) The dry material obtained in step (1) is sintered in an inert atmosphere. The calcination is divided into a heating section, a heat preservation section and a cooling section. The heating speed of the heating section is 86°C / h, and the temperature is raised to 705°C. The maintenance temperature in the section is 705°C, the residence time in the heat preservation section is 17 hours, the cooling rate in the cooling section is 110°C / h, and the temperature is lowered ...
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[0041] Example 2
[0042] A preparation method of lithium iron borate includes the following steps:
[0043] (1) Pour the lithium borohydride solution and ferric nitrate solution into a sealed high-pressure reaction vessel, stir and react for 50 minutes at a temperature of 240°C and a pressure of 3.5 atmospheres, then release the pressure, and use ferrous hydroxide as the exported gas The slurry is absorbed, then aluminum citrate is added, stirred and mixed evenly, and then spray-dried to obtain a dry material;
[0044] (2) The dry material obtained in step (1) is sintered in an inert atmosphere. The calcination is divided into a heating section, a heat preservation section and a cooling section. The heating speed of the heating section is 85℃ / h, and the temperature is increased to 706℃. The maintenance temperature in the section is 706°C, the residence time in the heat preservation section is 18 hours, the cooling rate in the cooling section is 107°C / h, and the temperature is lower...
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[0053] Example 3
[0054] A preparation method of lithium iron borate includes the following steps:
[0055] (1) Pour the lithium borohydride solution and ferric nitrate solution into a sealed high-pressure reaction vessel, stir and react for 45 minutes at a temperature of 240°C and a pressure of 3.5 atmospheres, then release the pressure, and use ferrous hydroxide for the exported gas The slurry is absorbed, then aluminum citrate is added, stirred and mixed evenly, and then spray-dried to obtain a dry material;
[0056] (2) The dry material obtained in step (1) is sintered in an inert atmosphere. The calcination is divided into a heating section, a heat preservation section and a cooling section. The heating speed of the heating section is 82℃ / h, and the temperature is raised to 703℃. The maintenance temperature in the section is 703°C, the residence time in the heat preservation section is 19 hours, the cooling rate in the cooling section is 107°C / h, and the temperature is lowered...
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