NCM ternary positive electrode material with lithium vacancy structure on surface
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A cathode material and vacancy technology, which is applied in the field of NCM ternary cathode materials, can solve the problems of transition metal element valence state change and crystal structure distortion.
Active Publication Date: 2021-11-26
BEIJING INSTITUTE OF TECHNOLOGYGY
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However, the doping of metal ions will cause the valence state of the transition metal eleme
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Embodiment 1
[0036] Step (1) Add 1 g of sodium thiosulfate to 50 mL of acetonitrile, stir and mix evenly at 40° C. for 1 h to obtain a mixed solution;
[0037] Step (2) Add 20 g of the NCM ternary cathode material body into the mixed solution, continue to maintain a stirring temperature of 30° C., and soak for 12 hours to obtain a suspension;
[0038] Step (3) filtering the suspension under reduced pressure to collect solid materials;
[0039] In step (4), the solid material is placed in a tube furnace, and the temperature is controlled in an oxygen atmosphere for heat treatment at 400° C. for 5 hours to obtain an NCM ternary cathode material with a lithium vacancy structure on the surface.
[0040] The scanning electron microscopy results of the final product are as follows figure 1 As shown, it can be seen from the figure that the final product is secondary particles, and the secondary particles are mainly composed of primary particles tightly packed.
[0041] According to the TEM test...
Embodiment 2
[0046] Step (1) Add 2 g of potassium nitrate into 50 mL of ethanol, stir and mix evenly at 30° C. for 1 h to obtain a mixed solution;
[0047] Step (2) Add 20 g of the NCM ternary cathode material body into the mixed solution, continue to maintain a stirring temperature of 40° C., and soak for 18 hours to obtain a suspension;
[0048] Step (3) filtering the suspension under reduced pressure to collect solid materials;
[0049] In step (4), the solid material is placed in a tube furnace, and the temperature is controlled in an oxygen atmosphere for heat treatment at 300° C. for 10 hours to obtain an NCM ternary cathode material with a lithium vacancy structure on the surface.
[0050] The scanning electron microscope results of the final product showed that the final product was secondary particles, and the secondary particles were mainly composed of primary particles closely packed.
[0051] According to the TEM test results, the (003) interplanar spacing of the material incr...
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Abstract
The invention relates to an NCM ternary positive electrode material with a lithium vacancy structure on the surface, and belongs to the field of chemical energy storage batteries. The method comprises the following steps: adding a weak oxidant into an organic solvent, and uniformly stirring and mixing to obtain a mixed solution; then adding an NCM ternary positive electrode material with micron-sized secondary particles into the mixed solution, and carrying out heat preservation at 20-60 DEG C for 12-24 hours to obtain a turbid liquid; and carrying out solid-liquid separation, and carrying out heat treatment on the collected solid material in an oxygen atmosphere at 200-600 DEG C for 1-10 hours to obtain the NCM ternary positive electrode material with a lithium vacancy structure on the surface, so that formation of lithium vacancies is beneficial to reducing the migration energy when Li < + > migrates among octahedral positions, and diffusion of Li < + > in the material is accelerated. Increase of the migration rate of Li < + > is beneficial to improving the rate capability of the material and reducing the polarization phenomenon at the same time. In addition, rapid movement of Li < + > also helps to improve the uniformity of Li distribution in the material and improve the cycling stability of the material.
Description
technical field [0001] The invention relates to an NCM ternary cathode material with a lithium vacancy structure on the surface, belonging to the field of chemical energy storage batteries. Background technique [0002] my country's current energy structure is dominated by fossil energy such as coal and petroleum. Extensive use and excessive reliance on fossil energy is not conducive to the development of my country's energy industry and the resolution of environmental problems. Therefore, the development of new green energy forms is the development of my country's energy industry. direction. As a secondary energy that can be used directly, electric energy covers almost all aspects of social development, so new forms of energy such as solar energy, geothermal energy, wind energy, etc. are usually converted into electric energy and utilized. With the popularity of electric vehicles and portable electronic devices, the development of new power storage devices has also received...
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