Low-cobalt doped spinel-layered structure lithium nickel manganate two-phase composite cathode material preparation method

A composite cathode material, spinel structure technology, applied in structural parts, battery electrodes, electrical components, etc., can solve the problems of low conductivity, insufficient cycle and rate performance, and achieve high energy density, excellent cycle and rate performance. Effect

Active Publication Date: 2018-12-25
GUANGDONG BRUNP RECYCLING TECH +3
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Problems solved by technology

In addition, spinel lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 In the process of charge and discharge, the cycle and rate performance are slightly insufficient, while the layered lithium nickel manganese oxide LiNi 0.5 mn 0.5 o 2 There is also the disadvantage of low conductivity

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  • Low-cobalt doped spinel-layered structure lithium nickel manganate two-phase composite cathode material preparation method
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preparation example Construction

[0031] A method for preparing a low-cobalt-doped spinel-layer structure lithium nickel manganese oxide two-phase composite positive electrode material, comprising the following steps:

[0032] 1) Use nickel salt and manganese salt to prepare nickel-manganese precursor Ni with spinel structure respectively 0.25 mn 0.75 (OH) 2 and layered nickel-manganese precursor Ni 0.5 mn 0.5 (OH) 2 ;

[0033] 2) Mix the nickel-manganese precursor with spinel structure, the nickel-manganese precursor with layered structure, lithium source and cobalt source evenly, and then calcinate to obtain composite cathode material.

[0034] In step 1), when the molar ratio of Ni in the nickel salt and the Mn in the manganese salt is controlled to be 1:3, the nickel-manganese precursor Ni of the spinel structure is obtained. 0.25 mn 0.75 (OH) 2 ; When controlling the Ni in the nickel salt and the Mn mol ratio in the manganese salt to be 1:1, obtain the nickel-manganese precursor Ni of layered stru...

Embodiment 1

[0061] Nickel nitrate and manganese nitrate were dissolved in deionized water at a molar ratio of 1:1 to prepare a salt solution with a metal ion concentration of 0.4mol / L. At the same time, sodium carbonate with the same volume and concentration was prepared as a precipitant, and 0.4mol / L ammonia water As a complexing agent, the three components are introduced into the reactor with equal volumes by a peristaltic pump, the reaction temperature is controlled at 55±0.5°C, the pH value is 10±0.2, and the stirring speed is 1200r / min. After reacting for 18 hours, the resulting precipitate was washed with deionized water for 3 times, and then dried at 120°C for 24 hours under a nitrogen protective atmosphere to obtain a layered structure lithium nickel manganese oxide Ni 0.5 mn 0.5 (OH)2 Precursor, its XRD pattern can be seen in the attached figure 1 , the SEM image can be seen in the attached figure 2 .

[0062] Similarly, nickel nitrate and manganese nitrate were dissolved in ...

Embodiment 2

[0066] Nickel nitrate and manganese nitrate were dissolved in deionized water at a molar ratio of 1:1 to prepare a salt solution with a metal ion concentration of 0.9 mol / L. At the same time, the same volume and concentration of sodium carbonate was prepared as a precipitant and 0.8 mol / L ammonia water As a complexing agent, the three components are introduced into the reactor with equal volumes by a peristaltic pump, the reaction temperature is controlled at 40±0.5°C, the pH value is 10.5±0.2, and the stirring speed is 800r / min. After reacting for 10 hours, the resulting precipitate was washed with deionized water for 3 times, and then dried at 115°C for 30 hours under a nitrogen protective atmosphere to obtain a layered structure lithium nickel manganese oxide Ni 0.5 mn 0.5 (OH) 2 Precursor.

[0067] Similarly, nickel nitrate and manganese nitrate were dissolved in deionized water at a molar ratio of 1:3 to prepare a salt solution with a metal ion concentration of 0.5 mol / ...

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Abstract

The invention discloses a low-cobalt doped spinel-layered structure lithium nickel manganate two-phase composite cathode material preparation method. The preparation method comprises the following steps: 1) preparing a nickel-manganese precursor with spinel structure and a nickel-manganese precursor with layered structure by using a nickel salt and a manganese salt; 2) uniformly mixing the nickel-manganese precursor with spinel structure, the nickel-manganese precursor with layered structure, the lithium source and the cobalt source, and then calcining to obtain the composite cathode material.The invention utilizes the spinel phase to enhance the stability of the layered structure, and conversely, the low Li + migration activation barrier of the layered structure lithium nickel manganategives the composite material the possibility of high rate performance. A small amount of cobalt doped into the composite can partially enter the transition metal layer, which can inhibit the Ni/Li mixing and enhance the conductivity of the composite. The composite cathode material prepared by the method has the characteristics of high energy density, excellent cycling and rate performance.

Description

technical field [0001] The invention relates to a preparation method of a low-cobalt doped spinel-layer structure lithium nickel manganese oxide two-phase composite positive electrode material, which belongs to the field of lithium battery materials. Background technique [0002] As the earliest commercialized lithium-ion battery cathode material, lithium cobalt oxide LiCoO 2 It has the characteristics of high specific capacity, stable charging and discharging platform, excellent cycle and rate performance, etc. However, on the one hand, cobalt resources are relatively scarce, the price is high, and it is of great strategic significance; on the other hand, the toxicity of cobalt will inevitably increase the pressure on environmental protection and the disposal cost of waste lithium-ion batteries. Cobalt cathode materials are undoubtedly the general trend of industry development. The rise of nickel-cobalt-manganese (NCM) ternary materials in the entire cathode material indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 汪乾阮丁山刘婧婧唐盛贺李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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