A co-doped modified high-nickel ternary material and its preparation method

A technology of positive electrode materials and metal elements, applied in the field of lithium battery positive electrode materials and preparation, can solve the problems of complicated manufacturing process, high cost, unfavorable industrial production, etc.

Active Publication Date: 2021-07-30
CENT SOUTH UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can effectively improve the cycle performance of the material, but the manufacturing process is complicated and the cost is high, which is not conducive to industrial production

Method used

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  • A co-doped modified high-nickel ternary material and its preparation method
  • A co-doped modified high-nickel ternary material and its preparation method
  • A co-doped modified high-nickel ternary material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0023] 1g high nickel (Ni 0.6 co 0.2 mn 0.2 )CO 3 The powder was successively mixed with 0.37674g lithium carbonate (Li 2 CO 3 ), 0.01768g boric acid (H 3 BO 3 ) and 0.02261g lithium carbonate (Li 2 CO 3 ) mixed evenly, and then raised to 500°C at a rate of 5°C / min in an oxygen atmosphere, and kept for 5 hours; then raised to 880°C at a rate of 3°C / min, kept for 15 hours, and naturally cooled to room temperature to obtain a co-doped modified High nickel ternary material.

[0024] The chemical general formula of the high-nickel ternary material prepared by the above method is LiNi 0.6 co 0.2 mn 0.2 Li 0.11 B 0.017 o 1.96 . The crystal structure of the co-doped modified high-nickel ternary material was analyzed using powder X-ray diffractometer (XRD), the results are as follows figure 1 As shown, the position of the peaks in the figure corresponds to the standard PDF card. There is the strongest peak at 18.726°, which is the (003) peak, the second strongest peak ...

Embodiment 2

[0031] 1g high nickel (Ni 0.6 co 0.2 mn 0.2 )O2 The powder was successively mixed with 0.49397g lithium carbonate (Li 2 CO 3 ), 0.02318g boric acid (H 3 BO 3 ) and 0.04446g lithium carbonate (Li 2 CO 3 ) were mixed evenly, and then the temperature was raised to 880° C. at a rate of 3° C. / min under an oxygen atmosphere, kept for 15 hours, and naturally cooled to room temperature to obtain a co-doped modified high-nickel ternary material.

[0032] The chemical general formula of the high-nickel ternary material prepared by the above method is LiNi 0.6 co 0.2 mn 0.2 Li 0.13 B 0.018 o 1.95 . The crystal structure of the co-doped modified high-nickel ternary material was analyzed by powder X-ray diffractometer (XRD). The position of the peak in the figure corresponds to the standard PDF card, and there is the strongest peak at 18.747°, which is (003) There is a second strong peak at 44.530°, which is the (104) peak, and a third strong peak at 36.768°, which is the (10...

Embodiment 3

[0036] 1g high nickel (Ni 0.8 co 0.1 mn 0.1 )CO 3 Powder, successively mixed with 0.5870g lithium hydroxide (LiOH·OH), 0.04970g sodium orthophosphate (Na 3 PO 4 ) and 0.02769g sodium carbonate (Na 2 CO 3 ) mixed evenly, and then raised to 500°C at a rate of 5°C / min in an oxygen atmosphere, and kept for 3 hours; then raised to 780°C at a rate of 10°C / min, kept for 15 hours, and naturally cooled to room temperature to obtain a co-doped modified High nickel ternary material.

[0037] The chemical general formula of the high-nickel ternary material prepared by the above method is LiNi 0.8 co 0.1 mn 0.1 Na 0.11 P 0.026 o 2.015 . The crystal structure of the co-doped modified high-nickel ternary material was analyzed by powder X-ray diffractometer (XRD). The position of the peak in the figure corresponds to the standard PDF card, and there is the strongest peak at 18.732°, which is (003) Peak, there is a second strong peak at 44.489°, which is the (104) peak, and there...

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Abstract

The invention provides a high-nickel ternary positive electrode material and a preparation method thereof, the general chemical formula is LiNi x co y mn z m 1 a m 2 b o 2+d ,M 1 It is a kind of alkali metal element Li, Na or K; M 2 It is a kind of non-metal element B, P, Si or S. Its preparation method is to mix ternary precursor powder with lithium-containing compound, M-containing 1 The compound containing M2 is mixed and kept at temperature 1 for a period of time, and the temperature is continued to be raised to temperature 2 to keep warm, so that M and M' ions can be uniformly diffused into the material, and a co-doped modified high-nickel ternary material is obtained. After the high-nickel ternary material of the present invention is modified by co-doping, Ni 2+ with Li + The mixing degree is low, the layer distance is increased, the structure is stable, and it has excellent electrochemical activity, rate performance and cycle stability; the method of the invention has a simple synthesis process and is suitable for industrial production.

Description

technical field [0001] The invention relates to a lithium battery cathode material and a preparation method, in particular to a ternary material and a preparation method. Background technique [0002] High-nickel ternary materials have become a common positive electrode material for power batteries because of their high energy density, low cost and relatively reliable safety. It has a-NaFeO2 layered structure, belongs to R-3m space group, and is a solid solution oxide obtained by substituting some Ni elements in LiNiO2 with metal elements such as Co and Mn. The introduction of Co can reduce the mixed occupation of cations, effectively stabilize the layered structure of the material, reduce the electrochemical impedance value, and improve the conductivity. However, when the Co content increases to a certain range, the capacity will decrease. The introduction of Mn can not only reduce the material cost, but also improve the safety and stability of the material. It is precise...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 韦伟峰张春晓彭澎杨成陈立宝
Owner CENT SOUTH UNIV
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