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

A technology for positive electrode materials and metal elements, which is applied in the field of lithium battery positive electrode materials and preparations, can solve problems such as high cost, complicated manufacturing process, and unfavorable industrial production, and achieve low mixing degree, simple synthesis process, and increased migration rate. Effect

Active Publication Date: 2019-01-01
CENT SOUTH UNIV +1
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  • Description
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Problems solved by technology

This method can effectively improve the cycle performance of the material, but the manufacturi

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

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Example Embodiment

[0022] Example 1

[0023] 1g high nickel (Ni 0.6 Co 0.2 Mn 0.2 )CO 3 The powder was 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 ) After mixing uniformly, in an oxygen atmosphere, the temperature is increased to 500°C at a rate of 5°C / min, and the temperature is kept for 5 hours; then the temperature is increased to 880°C at a rate of 3°C / min, the temperature is kept for 15 hours, and the temperature is naturally cooled to room temperature. High nickel ternary material.

[0024] The general chemical 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 by powder X-ray diffractometer (XRD), and the results are as follows figure 1 As shown, the position of the peak in the figure corresponds to the standard PDF card. There is the strongest peak at ...

Example Embodiment

[0030] Example 2

[0031] 1g high nickel (Ni 0.6 Co 0.2 Mn 0.2 )O 2 The powder is 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 ) After mixing uniformly, the temperature is increased to 880°C at a rate of 3°C / min in an oxygen atmosphere, the temperature is kept for 15 hours, and the mixture is naturally cooled to room temperature to obtain a co-doped modified high nickel ternary material.

[0032] The general chemical 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. There is the strongest peak at 18.747°, which is (003) Peak, there is the second strong peak at 44.530°, which is the (104) peak, and the third strong peak at 36.768...

Example Embodiment

[0035] Example 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 ) Mix uniformly, then increase to 500°C at a rate of 5°C / min and keep it for 3h under an oxygen atmosphere; then heat up to 780°C at a rate of 10°C / min, keep it for 15h, and cool to room temperature naturally to obtain a co-doping modification. High nickel ternary material.

[0037] The general chemical 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. There is the strongest peak at 18.732°, which is (003) Peak, there is the second strong peak at 44.489°, which is the (104) peak, and the...

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Abstract

The invention provides a high-nickel ternary cathode material and a preparation method thereof, wherein the general chemical formula is LiNixCoyMnzM<1>M<2>O<2+d>, M1 is one of alkali metal elements Li, Na or K; and M2 is one of the nonmetallic elements B, P, Si, or S. The preparation method includes mixing ternary precursor powder with a lithium-containing compound, a compound containing M1and a compound containing M2 at a temperature 1 for a period of time, further heating to a temperature 2, uniformly diffusing M and M' ions into the material, and obtaining a co-doped modified high-nickel ternary material. After the high-nickel ternary material of the invention is modified by co-doping, the mixed arrangement degree of Ni2+ and Li+ t is low, the layer spacing is enlarged, the structure is stable, and the ternary material has excellent electrochemical activity, rate performance and cycle stability; and the method of the invention is simple in synthesis process and is suitable for industrialized 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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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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