Rare-earth element samarium-doped modified lithium ion battery anode material and preparation method thereof
A technology for lithium ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems affecting the crystal structure and unit cell parameters of lithium iron phosphate, the electronic conductivity of materials is not significantly improved, and it cannot eliminate lithium ion intercalation migration. It can improve the high-rate discharge performance, strengthen the ion conductivity and electronic conductivity, and inhibit the growth of crystals.
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Embodiment 1
[0025] The first step is to mix 0.5mol lithium carbonate, 1mol diammonium hydrogen phosphate, 0.495mol ferric oxide, 0.01mol samarium oxide and 12.48g glucose, use absolute alcohol as a dispersant, and mix through high-speed ball mill;
[0026] In the second step, the mixed raw materials are placed in a well-type heating furnace, nitrogen gas is introduced as a protective gas, the temperature is raised to 350°C, and the temperature is kept constant for 10 hours. After cooling, the reaction precursor is obtained by grinding;
[0027] The third step is to put the obtained reaction precursor into the reactor, put it in the pit furnace, pass nitrogen gas as the protective gas, raise the temperature to 700°C, keep the temperature at a constant temperature for 24 hours, and after cooling with the furnace, grind and sieve the obtained powder. LiFe 1-x SM x PO 4 -SmPO 4 / C composite doping modified cathode material. figure 1 It is the LiFe prepared in Example 1 1-x SM x PO 4 -S...
Embodiment 2
[0030] In the first step, 1.02mol of lithium nitrate, 0.04mol of ammonium hydrogen phosphate, 0.96mol of ferric phosphate, 0.05mol of samarium acetate and 49.96g of sucrose are mixed, and ethanol is used as a dispersant, and the mixture is evenly mixed through a high-speed ball mill;
[0031] In the second step, the mixed raw materials are placed in a well-type furnace, and argon is introduced as a protective gas, and the temperature is raised to 250 ° C, and the temperature is kept constant for 10 hours, and the reaction precursor is obtained after cooling and grinding;
[0032] The third step is to put the reaction precursor into the reactor, put it in the pit furnace, pass nitrogen gas as the protective gas, raise the temperature to 800°C, and calcine at constant temperature for 32 hours. After cooling with the furnace, grinding, and sieving, the powder obtained is LiFe 1-x SM x PO 4 -SmPO 4 / C composite doping modified cathode material.
[0033] The above-mentioned comp...
Embodiment 3
[0035] The first step is to mix 1mol lithium phosphate, 0.97mol ferric citrate, 0.04mol samarium hydroxide and 2.49g glucose, use absolute alcohol as a dispersant, and mix by ball milling in a high-speed ball mill;
[0036] In the second step, the mixed raw materials are placed in a well-type heating furnace, nitrogen is introduced as a protective gas, the temperature is raised to 400°C, and the temperature is kept constant for 5 hours, and the reaction precursor is obtained by grinding after cooling;
[0037] The third step is to put the obtained reaction precursor into the reactor, put it in the pit furnace, pass nitrogen gas as the protective gas, raise the temperature to 500°C, keep the temperature for 40 hours, cool down with the furnace, grind and sieve the obtained powder. LiFe 1-x SM x PO 4 -SmPO 4 / C composite doping modified cathode material.
[0038] The above-mentioned composite doped modified positive electrode material is used as a positive electrode active m...
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