阅读说明：本技术 一种介孔三元纳米片正极材料的制备方法及其产品和应用 (Preparation method of mesoporous ternary nanosheet cathode material, product and application thereof ) 是由 崔大祥 吴晓燕 林琳 王敬锋 王岩岩 徐少洪 陈超 于 2020-06-10 设计创作，主要内容包括：本发明提供一种介孔三元纳米片正极材料(LiNi<Sub>1-x-y</Sub>Co<Sub>x</Sub>Mn<Sub>y</Sub>O<Sub>2</Sub>(0<x<1,0<y<1))的制备方法,本发明利用常压低温法制备介孔三元纳米片材料,该结构具有较大的比表面积,能够与电解液充分接触,进而可以提高材料的电化学性能。0.1C平均放电比容量约171 mAh/g,0.5C平均放电比容量约186 mAh/g,1C平均放电比容量约169 mAh/g,到10C平均放电比容量约93 mAh/g,重返0.1C平均放电比容量约167 mAh/g,具有较好的倍率性能。并且制备方法简单,工艺条件容易实现,能量消耗低,且制备无污染。(The invention provides a mesoporous ternary nanosheet cathode material (LiNi) 1‑x‑y Co x Mn y O 2 （0<x<1,0<y<1) The mesoporous ternary nanosheet material is prepared by a normal-pressure low-temperature method, has a large specific surface area, can be fully contacted with an electrolyte, and further can improve the electrochemical performance of the material. The 0.1C average specific discharge capacity is about 171 mAh/g, and the 0.5C average specific discharge capacityThe average specific discharge capacity of the lithium battery is about 186 mAh/g, the average specific discharge capacity of 1C is about 169mAh/g, the average specific discharge capacity of 10C is about 93 mAh/g, the average specific discharge capacity of 0.1C is returned to about 167 mAh/g, and the lithium battery has better rate capability. And the preparation method is simple, the process conditions are easy to realize, the energy consumption is low, and the preparation is pollution-free.)

1. Preparation method of mesoporous ternary nanosheet cathode material, wherein the cathode material is LiNi_1-x-yCo_xMn_yO₂（0<x<1, 0<y<1) The method is characterized in that the mesoporous ternary nanosheet material is prepared by a normal-pressure low-temperature method, and the method comprises the following steps:

(1) dissolving long-chain alkylamine in an alcohol solution to enable the concentration of the long-chain alkylamine to be 5-100 g/L, and marking as a solution A;

(2) respectively dissolving lithium acetate, nickelate, cobaltate and manganate into deionized water, and enabling the molar weight ratio of the lithium acetate to the nickelate to the cobaltate to the manganate to be 1: 1-x-y: x: y, labeled as solution B;

(3) and slowly dropwise adding the solution B into the solution A, reacting for 2-30 h at the normal pressure and the low temperature of 0-40 ℃, centrifuging the product, washing with an alcohol solution for 3-5 times, and drying in an oven at the temperature of 60-80 ℃ to obtain the final product, namely the mesoporous ternary nanosheet cathode material.

2. The preparation method of the mesoporous ternary nanosheet cathode material as recited in claim 1, wherein the long-chain alkylamine is one of decaamine, dodecylamine, or a combination thereof.

3. The preparation method of the mesoporous ternary nanosheet cathode material as recited in claim 1, wherein the alcohol is one or a combination of methanol, ethanol, and propanol.

4. The preparation method of the mesoporous ternary nanosheet cathode material of claim 1, wherein the nickelate is one or a combination of sodium nickelate, lithium nickelate and potassium nickelate.

5. The preparation method of the mesoporous ternary nanosheet cathode material as recited in claim 1, wherein the cobaltate is one or a combination of lithium cobaltate, sodium cobaltate and potassium cobaltate.

6. The preparation method of the mesoporous ternary nanosheet cathode material as recited in claim 1, wherein the manganate salt is one or a combination of lithium manganate, sodium manganate or potassium manganate.

7. A mesoporous ternary nanosheet cathode material, characterized by being prepared according to any one of claims 1-6.

8. The application of the mesoporous ternary nanosheet cathode material of claim 7 in a lithium ion battery.

Technical Field

The invention relates to a preparation method of a lithium battery positive electrode material, in particular to a preparation method of a mesoporous ternary nanosheet positive electrode material, and a product and application thereof.

Background

With the rapid development of smaller, lighter and higher performance electronic and communication devices, there is an increasing demand for the performance of batteries that provide power to these devices, particularly with respect to energy. However, the specific capacities of lithium ion batteries and MH/Ni batteries which are commercialized at present are difficult to be improved continuously. Therefore, the development of batteries with higher specific energy is urgently required. Lithium ion secondary batteries have been widely used as high specific energy chemical power sources in the fields of mobile communication, notebook computers, video cameras, portable instruments and meters, and the like, and have rapidly developed into one of the most important secondary batteries at present. Lithium ion batteries, which are the latest generation of green high-energy storage batteries, have been rapidly developed in the early 90 s of the 20 th century, and are favored because of their advantages of high voltage, high energy density, long cycle life, little environmental pollution, and the like.

The ternary material is the first choice material of the lithium battery due to low price and stable performance. Due to the ternary material LiNi_1-x-yCo_xMn_yO₂（0<x<1, 0<y<1) Has the characteristics superior to lithium iron phosphate and lithium cobaltate, and can prepare ternary electrode materials with different properties by adjusting the proportion of nickel, cobalt and manganese. With the rise and development of new energy automobiles, the improvement of the electrochemical performance of the ternary material becomes a research hotspot.

Disclosure of Invention

The invention aims to provide a preparation method of a mesoporous ternary nanosheet cathode material, so as to improve the electrochemical performance of the ternary material.

Yet another object of the present invention is to: provides a mesoporous ternary nanosheet cathode material product obtained by the method.

Yet another object of the present invention is to: provides an application of the product.

The purpose of the invention is realized by the following scheme: preparation method of mesoporous ternary nanosheet cathode material, wherein the cathode material is LiNi_1-x-yCo_xMn_yO₂（0<x<1, 0<y<1) The method comprises the following steps:

(1) dissolving long-chain alkylamine in an alcohol solution to enable the concentration of the long-chain alkylamine to be 5-100 g/L, and marking as a solution A;

(2) respectively dissolving lithium acetate, nickelate, cobaltate and manganate into deionized water, and marking the solution B with the molar weight ratio of 1: 1-x-y: x: y;

(3) and slowly dropwise adding the solution B into the solution A, reacting for 2-30 h at the low temperature of 0-40 ℃ under normal pressure, centrifuging the product, washing for 3-5 times by using an alcohol solution, and drying in an oven at the temperature of 60-80 ℃ to obtain the final product.

The invention utilizes a normal pressure low temperature method to prepare the mesoporous ternary nanosheet material. The preparation method is simple, the process conditions are easy to realize, the energy consumption is low, and the preparation is pollution-free.

On the basis of the scheme, the long-chain alkylamine is one of decaamine and dodecylamine or a combination of the decaamine and the dodecylamine.

The alcohol is one or the combination of methanol, ethanol or propanol.

The nickelate is one or the combination of sodium nickelate, lithium nickelate or potassium nickelate.

The cobaltate is one or the combination of lithium cobaltate, sodium cobaltate and potassium cobaltate.

The manganate is one or the combination of lithium manganate, sodium manganate or potassium manganate.

The invention also provides a mesoporous ternary nanosheet cathode material prepared by any one of the methods. The product structure of the invention has larger specific surface area, and can be fully contacted with electrolyte, thereby improving the electrochemical performance of the material.

The invention also provides application of the mesoporous ternary nanosheet cathode material in a lithium ion battery. The average specific discharge capacity of 0.1C is about 171 mAh/g, the average specific discharge capacity of 0.5C is about 186 mAh/g, the average specific discharge capacity of 1C is about 169mAh/g, the average specific discharge capacity of 10C is about 93 mAh/g, the average specific discharge capacity of 0.1C is about 167 mAh/g, and the high-rate-multiplication performance is realized.

The invention has the beneficial effects that:

the invention provides a mesoporous ternary nanosheet cathode material (LiNi)_1-x-yCo_xMn_yO₂（0<x<1, 0<y<1) The mesoporous ternary nanosheet material is prepared by a normal-pressure low-temperature method, and the structure has a large specific surface area and can be fully contacted with an electrolyte, so that the electrochemical performance of the mesoporous ternary nanosheet material can be improved. And the preparation method is simple, the process conditions are easy to realize, the energy consumption is low, and the preparation is pollution-free.

Drawings

FIG. 1 is a mesoporous ternary nanosheet LiNi of example 1_1/3Co_1/3Mn_1/3O₂XRD pattern of the material;

FIG. 2 is a mesoporous ternary nanosheet LiNi of example 2_0.5Co_0.3Mn_0.2O₂A cycle life graph of the material;

FIG. 3 is a mesoporous ternary nanosheet LiNi of example 3_0.8Co_0.1Mn_0.1O₂The rate performance of the material.

Detailed Description

The present invention is described in detail by the following specific examples, but the scope of the present invention is not limited to these examples.