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Positive electrode active material, preparation method thereof and lithium battery

A positive electrode active material and lithium ion technology, which is applied in the field of positive electrode active material and its preparation and lithium battery, can solve the problems such as the limited effect of improving the stability of lithium nickel manganese oxide material, so as to improve the cycle stability performance and Coulomb efficiency, and improve the stability properties, the effect of inhibiting the dissolution of manganese

Active Publication Date: 2020-12-29
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned metal doping has a limited effect on improving the stability of lithium nickel manganese oxide materials.

Method used

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  • Positive electrode active material, preparation method thereof and lithium battery
  • Positive electrode active material, preparation method thereof and lithium battery
  • Positive electrode active material, preparation method thereof and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 18g of LiNi 0.5 mn 1.5 o 4 Material (Shandong Qixing Energy Materials Co., Ltd.), 0.54g CuO and 0.267g (NH 4 ) 2 HPO 4 Mix evenly, and calcinate the obtained mixture in oxygen at 600° C. for 5 h, with a heating rate of 3° C. / min and a cooling rate of 5° C. / min.

[0047] figure 1 LiNi after showing the phosphorus element doping that embodiment 1 makes 0.5 mn 1.5 o 4 STEM map. From figure 1 Phosphorus doped LiNi 0.5 mn 1.5 o 4 It can be seen from the STEM image that there is a rock-salt-like phase generated by the occupation of 16c atoms of spinel octahedron on the surface of the material, and the thickness of the rock-salt-like phase on the surface is about 12nm.

[0048] figure 2 (a) and (b) are LiNi after phosphorus element doping that embodiment 1 makes 0.5 mn 1.5 o 4 STEM line scan of the surface, from figure 2 It can be seen that the surface of lithium nickel manganese oxide after doping is still a typical spinel structure of lithium nickel man...

Embodiment 2

[0050] 18g of LiNi 0.4 mn 1.6 o 4 Material (Shandong Qixing Energy Materials Co., Ltd.), 0.54g H 3 PO 4 Mix evenly with 1 g of oxalic acid, and calcinate the resulting mixture in oxygen at 600° C. for 5 h, with a heating rate of 3° C. / min and a cooling rate of 5° C. / min.

[0051] image 3 LiNi after showing the phosphorus element doping that embodiment 2 makes 0.4 mn 1.6 o 4 STEM images of , where (a) and (b) are images at different magnifications, respectively. From image 3 Phosphorus doped LiNi 0.4 mn 1.6 o 4 It can be seen from the STEM image that there is a rock-salt phase occupying the spinel octahedron 8a atoms on the surface of the material, and the thickness of the surface rock-salt phase is about 10nm.

[0052] Figure 4 LiNi after showing the phosphorus element doping that embodiment 2 makes 0.4 mn 1.6 o 4 The relative content of phosphorus on the surface was characterized by XPS at different etching depths. We can see that the content of phosphorus ...

Embodiment 3

[0054] 18g of LiNi 0.5 mn 1.5 o 4 Material (Shandong Qixing Energy Materials Co., Ltd.), 0.54g Cr 2 o 3 and 0.267g (NH 4 ) 2 HPO 4 and 20ml of deionized water were added into a beaker and mixed evenly, and the beaker was placed in an oil bath at 120° C. and heated with stirring for 5 hours to obtain a dry mixture. The resulting mixture was calcined in air at 725°C for 5h, with a heating rate of 3°C / min and a cooling rate of 5°C / min.

[0055] Figure 5 LiNi after showing the phosphorus element doping that embodiment 3 makes 0.5 mn 1.5 o4 STEM map. From Figure 5 Phosphorus doped LiNi 0.5 mn 1.5 o 4 It can be seen from the STEM image that there are rock-salt-like phases occupying 2-3nm spinel octahedral 8a and 16c atoms on the surface of the material, and the thickness of the rock-salt-like phase on the surface is about 2nm.

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Abstract

The present invention provides a positive electrode active material having a spinel structure. The positive electrode active material comprises lithium-containing compound particles having a chemicalformula of Li1+xNi0.5-yMn1.5-zOu, wherein -0.2< / =x< / = 0.2, -0.2< / = y< / = 0.2, -0.2< / = z< / =0.2, and 3.8 < / = u < / = 4.2, the positive electrode active material is characterized in that surfaces of the lithium-containing compound particles have a rock salt phase surface layer having a gradient phosphorus distribution, and contains a metal element that occupies the 16c or 8a position of the spinel octahedron. Compared with the prior art, the surface gradient phosphorus-doped spinel positive electrode active material for the lithium ion battery provided by the invention is advantaged in that (1) thepreparation method is simple in process and low in cost; (2) the comprehensive performance of the spinel positive electrode active material can be greatly improved, and the spinel positive electrode active material has an excellent development prospect.

Description

technical field [0001] The invention relates to a positive electrode active material for a lithium ion battery, a preparation method thereof, a positive electrode containing the positive electrode active material, and a lithium ion battery. Background technique [0002] Compared with other rechargeable battery systems, lithium-ion secondary batteries have the advantages of high working voltage, light weight, small size, no memory effect, low self-discharge rate, long cycle life, and high energy density. Mobile terminal products such as mobile phones, laptops, and tablets. In recent years, due to environmental protection considerations, electric vehicles have been rapidly developed under the impetus of governments and automobile manufacturers, and lithium-ion secondary batteries have become an ideal power source for new-generation electric vehicles due to their excellent performance . [0003] At present, the positive electrode materials of lithium-ion secondary batteries t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M10/0525H01M10/058
CPCH01M4/362H01M4/505H01M4/525H01M4/628H01M4/131H01M10/0525H01M10/058H01M4/36H01M4/62Y02E60/10Y02P70/50
Inventor 武怿达黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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