Cobalt-free positive electrode material, and preparation method and application thereof

A positive electrode material and positive electrode technology, applied in the field of cobalt-free positive electrode material and its preparation, can solve the problems of cation mixing material structure, instability, etc., achieve high ionic conductivity, improve stability, and facilitate Li+ diffusion.

Active Publication Date: 2022-02-18
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increasing the relative content of nickel can increase the discharge capacity, but at the same time it will bring about the problems of cation mixing and material structure instability.

Method used

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  • Cobalt-free positive electrode material, and preparation method and application thereof
  • Cobalt-free positive electrode material, and preparation method and application thereof
  • Cobalt-free positive electrode material, and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0050] According to the method for preparing a cobalt-free positive electrode material of the present invention, by mixing the cobalt-free precursor with a metal oxide and a lithium source and then sintering, the first coating including a lithium salt compound can be sequentially formed on the surface of the cobalt-free precursor material in one step layer and the second coating layer comprising metal oxide, the first coating layer comprising lithium salt compound can inhibit the occurrence of side reactions on the surface of the positive electrode material, which is beneficial to improve the stability of the material, and the formed second coating layer comprising lithium salt compound A cladding layer has a high ionic conductivity, which is beneficial for Li + Diffusion, the second coating layer including metal oxide can improve the stability of the cobalt-free positive electrode material, and then form the third coating layer including carbon material on the surface of the s...

Embodiment 1

[0057] The method of preparing the positive electrode:

[0058] (1) First, the cobalt-free precursor (chemical formula is Ni 0.75 mn 0.25(OH) 2 ), LiOH·H 2 O carry out ball milling, the mass ratio of material and grinding beads is 1:5, the number ratio of large and small beads is 1:2, the diameter of large beads is 10mm, the diameter of small beads is 5mm, the speed of ball milling is 300r / min, and the time is 2h. After it is completed , join MoO 3 (Co-free precursor, LiOH·H 2 O, MoO 3 The molar ratio is 1:2.2:1), ball milling again at the same speed for 2 hours;

[0059] (2) Separate the above mixture into beads, then place it in a tube furnace for sintering at 600°C for 6 hours, the heating rate is 5°C / min, the sintering atmosphere is oxygen atmosphere, and NM is obtained after cooling with the furnace x @Li 2 MoO 4 -MoO 3 Materials, @ here and below only means wrapping;

[0060] (3) Using a high-speed stirrer, set the speed at 1200r / min, disperse single-walled CN...

Embodiment 2

[0065] In step (3) of Example 1, the single-walled CNT accounted for 0.25wt% of the cobalt-free positive electrode material was replaced with the single-walled CNT accounted for 0.5wt% of the cobalt-free positive electrode material. In the obtained cobalt-free positive electrode material, the first coating layer, the second The thickness ratio of the cladding layer and the third cladding layer is 3:5:6.5, and the rest of the process is the same as in Example 1. The obtained half-cell rate performance, cycle performance and electrochemical impedance (EIS) at 50% SOC are tested. The result is as Figure 3-Figure 5 and Table 1.

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Abstract

The invention discloses a cobalt-free positive electrode material and a preparation method thereof. The cobalt-free positive electrode material comprises a cobalt-free precursor, a first coating layer, a second coating layer and a third coating layer, the first coating layer is formed on the surface of the cobalt-free precursor, and the first coating layer comprises a lithium salt compound; a second coating layer is formed on the surface of the first coating layer, the second coating layer includes a metal oxide; and the third coating layer is formed on the surface of the second coating layer, and the third coating layer includes a carbon material. The cobalt-free positive electrode material integrates the stability, the safety and the rate capability of a cobalt-free material so that the electrochemical performance of the positive electrode can be improved while the cost is reduced.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a cobalt-free positive electrode material and a preparation method and application thereof. Background technique [0002] With the gradual scarcity of traditional fossil fuels and the increasing demand for energy, people are gradually shifting their attention to the development and utilization of clean and sustainable energy. As an important part of the clean energy field, lithium-ion batteries play a pivotal role in promoting energy transformation. As the main source of deintercalable lithium ions, the cathode material has a great influence on the performance and cost of the battery. At present, the mature and applied cathode materials on the market mainly include lithium cobaltate, lithium manganate, lithium iron phosphate and ternary materials. However, in the existing ternary system lithium-ion power batteries, most of the cost of positive electrode materials co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M4/131H01M10/0525
CPCH01M4/628H01M4/505H01M4/525H01M4/131H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 胡鹏飞郑军华林逢建
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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