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A kind of cathode active material and preparation method thereof, secondary battery cathode, lithium battery
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A positive electrode active material and lithium compound technology, applied in the field of materials, can solve the problems of limited stability improvement of lithium cobalt oxide materials and other issues
Active Publication Date: 2022-03-04
SONGSHAN LAKE MATERIALS LAB +1
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However, the above-mentioned metaldoping has a limited effect on improving the stability of lithium cobaltoxide materials.
Method used
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[0059] The present application also provides a method for preparing the above-mentioned positive electrode active material, including:
[0060] first doping boron in the lithium-containing compound particles, and then doping nickel;
[0061] Or, doping nickel in the lithium-containing compound particles first, and then doping boron;
[0062] Alternatively, boron and nickel are doped together in the lithium-containing compound particles.
[0063] In other words, in this application, nickel and boron can be doped simultaneously, or one can be doped first, and then the other can be doped.
[0064] In the embodiment of this application, doping is performed by sintering. It can be understood that in other embodiments of this application, other methods can be used for doping. In this embodiment, high temperature sintering is used. Doping is described as an example.
[0065] For example, the boron source, the nickel source, the fusion agent and the lithium-containing compound part...
Embodiment 1
[0089] This embodiment provides a positive electrode active material, which is mainly prepared by the following method:
[0090] 50g of LiCo 0.98 al 0.02 o 2 Material, 0.2g H 3 BO 3 , 0.15g NiO, 2g sucrose and 20g deionized water were evenly mixed, and the resulting mixture was dried in a 120°C water bath environment, and the above-mentioned dried mixture was calcined at 800°C for 5h, and the heating rate was 3°C / min. After the calcination was completed, Decrease to room temperature at a rate of 5°C / min.
[0091] figure 1 A STEM image of the positive electrode active material provided in Example 1 of the present application is shown. figure 2 A STEM line scan image of the surface of the positive electrode active material provided in Example 1 of the present application is shown.
[0092] From figure 1 and figure 2 It can be seen that the contents of boron and nickel elements gradually decrease from the surface to the interior.
Embodiment 2
[0094] This embodiment provides a positive electrode active material, which is mainly prepared by the following method:
[0095] 50g of LiCo 0.98 al 0.02 o 2 Material, 0.15g B 2 o3 , 0.15g NiO were evenly mixed, and the resulting mixture was calcined in air at 800°C for 5h with a heating rate of 3°C / min, and after the calcination was completed, the rate was lowered to room temperature at a rate of 5°C / min.
[0096] image 3 The XPS characterization diagram of the cathode active material provided in Example 2 is shown. image 3 It can be seen that: LiCo doped with boron and nickel elements 0.98 al 0.02 o 2 The relative content changes of boron and nickel elements on the surface obtained by XPS characterization at different etching depths, we can see that the content of boron and nickel elements decreases from the surface to the interior as the etching depth increases.
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Abstract
The present application relates to the field of materials, in particular, to a positive electrode active material and a preparation method thereof, a secondary battery positive electrode, and a lithium battery. The positive electrode active material includes a chemical formula of Li 1+x co 1‑y m z o u The lithium-containing compound particles, the boron gradiently doped on the lithium-containing compound particles and the nickel gradiently doped on the lithium-containing compound particles. From the outer surface to the inner surface of the lithium-containing compound particles, the contents of the boron and the nickel gradually decrease. Nickel and boron gradient doping can significantly reduce the Li with lamellar structure 1+x co 1‑y m z o u The surface activity of the lithium cobalt oxide material plays a synergistic role on the surface of the lithium-containing compound particles, synergistically reduces the surface activity of the layered lithium cobalt oxide, increases the stability of the lithium cobalt oxide material and increases the electronic conductivity of the lithium cobaltoxide material, and inhibits the lithium cobaltoxide material under high temperature and high pressure conditions. The transition metals on the surface of the layered positive electrode active material dissolve during the down cycle, thereby improving its capacity retention and charge-discharge Coulombic efficiency.
Description
technical field [0001] The present application relates to the field of materials, in particular, to a positive electrode active material and a preparation method thereof, a secondary battery positive electrode, and a lithium battery. Background technique [0002] Compared with other rechargeable battery systems, lithium-ion secondary batteries have the advantages of high working voltage and light weight. The positive electrode materials of lithium-ion secondary batteries can be roughly divided into three categories, lithium cobaltate, lithium iron phosphate and lithium manganate. [0003] Lithium cobaltate has high capacity and density; for high-voltage lithium cobaltate cathode material, during the cycle, due to the interaction between the traditional carbonateelectrolyte and the cathode material, the surface of the cathode material loses oxygen, and the surface of the material occurs Dissolution, eventually leading to a reduction in the active substance. [0004] In ord...
Claims
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