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Modified nickel cobalt lithium manganese oxide ncm111 ternary positive electrode material and its preparation method and battery
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A technology of NCM111 and lithium nickel cobalt manganese oxide, which is applied in battery electrodes, secondary batteries, circuits, etc., to achieve high conductivity, improve power performance, and improve conductivity
Active Publication Date: 2022-06-14
余姚市海泰贸易有限公司
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However, they are all doped with a single element (the single metal ion or single rare earth ion disclosed in the above reference document) and combined with a conductive polymer or metal oxide CeO2 or LiFePO4 Coating the surface of the positive electrode material, no metal hydroxide is used as the doping material, and metal hydroxide is used as the coating material for joint modification to improve the electrical properties of the NCM111 ternary positive electrode material, thereby significantly improving its battery power Related reports on density and high temperature storage performance
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preparation Embodiment 1
[0041] Will Li 2 CO 3 , the precursor Ni 0.3 co 0.3 mn 0.3 (OH) 2 (commercially available), Zr(OH) 4 , Mg(OH) 2 According to the molar ratio of 1:0.992:0.005:0.001, add it into the high-speed grinder and wait for it to be fully mixed, then roast it in a muffle furnace at 700°C for 7h; then mix the product obtained after roasting with Ti(OH) 4 According to the molar ratio of 1:0.002, it was added to the high-speed grinder again and continued to stir until it was fully mixed, and then it was roasted in a muffle furnace at 850°C for 10 hours to obtain the final product Li[Ni 0.3 co 0.3 mn 0.3 ] 0.992 Zr 0.005 Mg 0.001 Ti 0.002 o 2 , denoted as sample S1.
[0042] Preparation Example 2 (Zr, Mg doping, Ti coating)
preparation Embodiment 2
[0043] Will Li 2 CO 3 , the precursor Ni 0.3 co 0.3 mn 0.3 (OH) 2 , Zr(OH) 4 , Mg(OH) 2 According to the molar ratio of 1:0.992:0.0048:0.0012, add it into the high-speed grinder and wait for it to be fully mixed, then roast it in a muffle furnace at 700 °C for 7 hours; then mix the product obtained after roasting with Ti(OH) 4 According to the molar ratio of 1:0.002, add it into the high-speed grinder and continue to stir until it is fully mixed, and then roast it in a muffle furnace at 850 ° C for 10 hours to obtain the final product Li[Ni 0.3 co 0.3 mn 0.3 ] 0.992 Zr 0.0048 Mg 0.0012 Ti 0.002 o 2 , denoted as sample S2.
[0044] Preparation Example 3 (Zr, Mg doping, Ti coating)
preparation Embodiment 3
[0045] Will Li 2 CO 3 , the precursor Ni 0.3 co 0.3 mn 0.3 (OH) 2 , Zr(OH) 4 , Mg(OH) 2 According to the molar ratio of 1:0.992:0.0051:0.0009, it was added into the high-speed grinder and after it was fully mixed, it was roasted in a muffle furnace at 700 °C for 7 hours; then the product obtained after roasting was mixed with Ti(OH) 4 According to the molar ratio of 1:0.002, add it into the high-speed grinder and continue to stir until it is fully mixed, and then roast it in a muffle furnace at 850 ° C for 10 hours to obtain the final product Li[Ni 0.3 co 0.3 mn 0.3 ] 0.992 Zr 0.0051 Mg 0.0009 Ti 0.002 o 2 , denoted as sample S3.
[0046] Preparation Example 4 (Zr, Mg doping, Ti coating)
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Abstract
The invention discloses a modified nickel-cobalt lithium manganese oxide NCM111 ternary positive electrode material, a preparation method thereof and a battery, wherein the chemical formula of the modified NCM111 ternary positive electrode material is: Li[Ni 0.3 co 0.3 mn 0.3 ] x R z m y o 2 , wherein: x+y+z=1; x: y: z=0.992: (0.001~0.003): (0.005~0.007); R element includes at least two kinds of metal elements Mg, Ti, Zr, Al; M element It is at least one of Zn, Ti, Zr and Al. The invention improves the ion conductivity of the material through the joint modification of doping and coating, stabilizes the structure of the material and improves the performance of the material. Using the intermolecular force between materials, select a variety of suitable doping materials and select a coating material that has little effect on the structure of the intermediate NCM111 material, but can significantly improve the conductivity of the material. The ratio between them can be used to improve the crystal particle size of the positive electrode material and the conductivity of the positive electrode material, thereby improving the power performance and high-temperature storage performance of the lithium-ion battery.
Description
technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a modified nickel-cobalt lithium manganese oxide NCM111 ternary positive electrode material, a preparation method thereof and a battery. technical background [0002] With the rapid development of the global economy and people's increasing attention to environmental issues, new energy vehicles will soon gain a foothold in the automotive industry. As a branch of new energy vehicles, HEV (abbreviation for Hybrid Electric Vehicle) will occupy a large space in the future market. The 48V micro-hybrid system is the main component of HEV, and the performance of the battery will determine the performance of HEV. [0003] In the European market, under the guidance of German automakers, the standardization of 48V hybrid power systems has made progress, and relevant preparations have been carried out for popularization. The hybrid...
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