Lithium molybdate cathode material for lithium ion battery and preparation method thereof
A technology of lithium ion battery and negative electrode material, which is applied to battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., to achieve the effect of simple preparation
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Embodiment 1
[0043] Will Li 2 CO 3 and MoO 2 Weigh it according to the stoichiometric ratio (molar ratio) of Li:Mo=2:1, grind it in an agate mortar for 30min, and mix well;
[0044] Then in the air atmosphere, heat up to 200 ° C for 4 hours of heat preservation pretreatment, and then grind again after natural cooling;
[0045] Then sinter in air at 500°C for 24h to obtain lithium molybdate (Li 2 MoO 4 ) anode material.
[0046] The XRD pattern of the product is shown in figure 1 (a), as can be seen from the figure, using this solid-state sintering method, a pure-phase trigonal lithium molybdate (Li 2 MoO 4 ) negative electrode material, there is no impurity peak in the spectrum, and the product has high purity. The lithium molybdate (Li 2 MoO 4 ) The negative electrode material is in the voltage range of 0.1~2.5V, and the rate is 0.33C and 0.5C respectively. The first charge and discharge and the second discharge curve are as follows figure 2 , image 3 As shown, the cycle per...
Embodiment 2
[0049] Will Li 2 CO 3 and MoO 3 Weigh according to the stoichiometric ratio of Li:Mo=2:1, add Li 2 CO 3 and MoO 3 The total mass of the precursor is 10wt% citric acid as a carbon source, and the raw material is ball milled in a planetary ball mill for 5 hours;
[0050] Under Ar gas atmosphere, heat up to 250°C for 5 hours of heat preservation pretreatment, after natural cooling, ball mill again;
[0051] Sintering was carried out at 550 °C for 15 h under Ar gas atmosphere to obtain carbon-coated lithium molybdate (Li 2 MoO 4 ) anode material.
[0052] The XRD pattern of the product is shown in figure 1 (b), as can be seen from the figure, using this solid-state sintering method, a pure-phase trigonal lithium molybdate (Li 2 MoO 4 ) negative electrode material, there is no impurity peak in the spectrum, and the product has high purity. The lithium molybdate (Li 2 MoO 4 ) The negative electrode material is within the voltage range of 0.1~2.5V, and the rate is 0.25C...
Embodiment 3
[0054] CH 3 COOLi and (NH 4 ) 2 MoO 4 Weigh according to the stoichiometric (molar ratio) ratio of Li:Mo=2:1, ball mill the raw materials in a planetary ball mill for 10 hours, and mix well;
[0055] Then, in an air atmosphere, heat preservation pretreatment was carried out at 300 ° C for 6 hours, after natural cooling, acetylene black accounting for 5 wt% of the sample mass after cooling was added, and ball milled again;
[0056] in N 2 sintering at 650°C for 12 h in an air atmosphere to obtain carbon-coated lithium molybdate (Li 2 MoO 4 ) anode material.
[0057] The XRD pattern of the product is shown in Figure 7 (a), as can be seen from the figure, using this solid-state sintering method, a pure-phase trigonal lithium molybdate (Li 2 MoO 4 ) negative electrode material, there is no impurity peak in the spectrum, and the product has high purity. The lithium molybdate (Li 2 MoO 4 ) The negative electrode material is within the voltage range of 0.1~2.5V, and the ...
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