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Sodium ion gradient doped spinel structure positive electrode active material and preparation method thereof

A positive electrode active material and spinel structure technology, applied in the direction of structural parts, battery electrodes, electrical components, etc., can solve problems such as harsh conditions, unfavorable large-scale industrial production, complex synthesis process, etc., achieve good performance and improve electrochemical performance. The effect of simple performance and process steps

Inactive Publication Date: 2020-04-17
SONGSHAN LAKE MATERIALS LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This material improvement method can improve the cycle stability of the material to a certain extent, but due to the complex synthesis process and harsh conditions, it is not conducive to large-scale industrial production

Method used

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  • Sodium ion gradient doped spinel structure positive electrode active material and preparation method thereof
  • Sodium ion gradient doped spinel structure positive electrode active material and preparation method thereof
  • Sodium ion gradient doped spinel structure positive electrode active material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] 2g of sodium alginate was dissolved in 50g of deionized water to form a solution, and 100g of LiNi 0.5 mn 1.5 o 4 (purchased from Shandong Qixing Energy Materials Co., Ltd.) was uniformly mixed with the above solution to form a slurry, and the above slurry was spray-dried at 140°C to form a dry powder, and the above dry powder was placed in a box furnace and calcined at 600°C for 5 hours , the heating rate is 3°C / min, the cooling rate is 1°C / min, and finally the sodium ion gradient doped LiNi 0.5 mn 1.5 o 4 Positive active material.

[0033] see figure 1 and figure 2It can be known that the sodium ion gradient doped LiNi prepared in Example 1 0.5 mn 1.5 o 4 Compared with the original material, the cycle and efficiency of the positive electrode active material at high temperature are significantly improved.

Embodiment 2

[0035] 1.5g of sodium hydroxymethylcellulose was dissolved in 50g of deionized water to form a solution, and 100g of LiNi 0.5 mn 1.5 o 4 (purchased from Shandong Qixing Energy Materials Co., Ltd.) was uniformly mixed with the above solution to form a slurry, and the above slurry was stirred and evaporated in an oil bath at 120° C. to form a dry powder, and the above dry powder was placed in a box furnace in Calcined at 700°C for 5 hours, with a heating rate of 3°C / min and a cooling rate of 1°C / min, finally obtaining sodium ion gradient doped LiNi 0.5 mn 1.5 o 4 Positive active material.

[0036] see image 3 and Figure 4 It can be known that the sodium ion gradient doped LiNi prepared in Example 2 0.5 mn 1.5 o 4 Compared with the original material, the cycle and efficiency of the positive electrode active material at high temperature are significantly improved. From Figure 7 It can be seen that the gradient sodium ion doped LiNi prepared in Example 2 0.5 mn 1.5 ...

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Abstract

The invention discloses a sodium ion gradient doped spinel structure positive electrode active material and a preparation method thereof. The sodium ion gradient doped spinel structure positive electrode active material comprises lithium-containing compound particles of which the chemical formula is Li < 1 + x > Na < y > Ni < 0.5-z > Mn < 1.5-r > O , wherein-0.2 < = x < = 0.2, -0.2 < = y < =0.2, -0.2 < = z < = 0.2, -0.2 < = r < = 0.2, and 3.8 < = u < = 4.2, the lithium-containing compound particles are doped with sodium ions, the concentration of the sodium ions is gradually reduced fromthe surface to the interior, and the doped precursor of the sodium ions is -COONa-containing organic sodium salt. With utilizing of the thickening, bonding, dispersing and stabilizing effects of theorganic sodium salt in the aqueous solution, the electrochemical performance of the spinel lithium nickel manganese oxide positive electrode material can be remarkably improved, the overall performance of the battery is optimized and improved, and the material has a wide application prospect in application and development of the spinel positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a sodium ion gradient doped spinel structure positive electrode active material and a preparation method and application thereof. 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 s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M10/0525
CPCH01M4/131H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 武怿达黄学杰詹元杰马晓威
Owner SONGSHAN LAKE MATERIALS LAB
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