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Preparation method of spherical nickel-lithium manganate anode material

A technology of lithium nickel manganate and cathode material, applied in the field of cathode material of chemical power supply lithium ion battery, can solve the problems of high equipment condition requirements and complex process, and achieve the effects of good processing performance, simple process and rich source of raw materials

Active Publication Date: 2014-02-12
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of spherical precursors requires precise control of parameters such as feeding speed, pH value, stirring speed, reaction temperature, and the amount of complexing agent. The process is complex and requires high equipment conditions.

Method used

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  • Preparation method of spherical nickel-lithium manganate anode material
  • Preparation method of spherical nickel-lithium manganate anode material
  • Preparation method of spherical nickel-lithium manganate anode material

Examples

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Effect test

Embodiment 1

[0017] Weigh out lithium acetate, nickel acetate, and spherical trimanganese tetroxide according to the molar ratio of 2:1:1. figure 1 As shown), dissolve lithium acetate and nickel acetate in ethanol to form a solution with a total metal cation concentration of 0.1 mol / L, add spherical trimanganese tetroxide to the above solution, and heat it in a 50°C water bath while stirring to form a paste The mixture is dried at 90°C to obtain a gray-black powder, which is calcined at 750°C for 6 hours, annealed at 615°C for 2 hours, and directly sieved after cooling to obtain lithium nickel manganate cathode material. The resulting material inherited the spherical morphology of trimanganese tetroxide ( figure 2 ), the first 1C discharge capacity of its button battery is 126.1mAh / g ( image 3 ), the capacity retention rate of 100 cycles is 100.1%.

Embodiment 2

[0019] Weigh out lithium nitrate, nickel acetate and spherical trimanganese tetroxide according to the molar ratio of 2:1:1, dissolve lithium nitrate and nickel acetate in ethanol to form a solution with a total concentration of metal cations of 0.2mol / L. Add spherical trimanganese tetroxide to the solution, heat it in a water bath at 60℃ while stirring to form a paste-like mixture, and dry it at 100℃ to obtain a gray-black powder. The obtained powder is calcined at 850℃ for 12h, annealed at 650℃ for 4h, and directly after cooling Sieve to obtain lithium nickel manganate cathode material. The obtained material button battery has a 1C first discharge capacity of 128.2 mAh / g, and a capacity retention rate of 100.2% after 100 cycles.

Embodiment 3

[0021] Weigh out lithium nitrate, nickel nitrate and spherical manganese tetroxide in a molar ratio of 2:1:1, dissolve lithium nitrate and lithium nitrate in ethanol to form a solution with a total concentration of metal cations of 0.3 mol / L. Add spherical manganese tetroxide to the solution, heat it in a water bath at 70°C while stirring to form a paste-like mixture, and dry at 110°C to obtain a gray-black powder. The resulting powder is calcined at 950°C for 24h and annealed at 675°C for 6h. Sieve to obtain lithium nickel manganate cathode material. The obtained material button battery has a 1C first discharge capacity of 123.2mAh / g, and a capacity retention rate of 100.3% after 100 cycles.

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Abstract

The invention discloses a preparation method of a spherical nickel-lithium manganate anode material. The preparation method is characterized by comprising the following steps: weighing a lithium source compound, a nickel source compound and spherical manganous-manganic oxide by a mol ratio of 2:1:1; dissolving the lithium source compound and the nickel source compound in ethanol to prepare a solution of which the total concentration of metal cation is 0.1-0.3 mol / L; adding the spherical manganous-manganic oxide into the solution; heating the solution in a water bath with stirring until a paste-like mixture is formed; drying the paste-like mixture at 90-110 DEG C to obtain gray black powder; roasting the obtained powder at 750-950 DEG C for 6-36 hours; annealing at 615-675 DEG C for 2-6 hours; cooling, directly sieving, and then obtaining the nickel-lithium manganate anode material. The lithium source compound is lithium acetate or lithium nitrate, and the nickel source compound is nickel acetate or nickel nitrate. The water-bath heating temperature is 50-70 DEG C.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery cathode materials for chemical power sources, and is a method for preparing spherical lithium nickel manganate cathode materials, and particularly relates to a method for preparing high-voltage anode material lithium nickel manganate. technical background [0002] Spinel lithium nickel manganese oxide (LiNi 0.5 Mn 1.5 O 4 ) Cathode material is one of the most researched high-energy density cathode materials. Its discharge voltage platform is 4.7V, which is about 20% higher than that of lithium manganate, and its reversible capacity can reach 130mAh / g (theoretical 147mAh / g), which is also about 20% higher than that of lithium manganate, thus having a higher performance than lithium manganate. Energy density, more critically, is that all Mn in the structured lithium nickel manganese oxide is +4 valence, which eliminates the disproportionation reaction and the Young-Taylor effect caused, and h...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122C01G45/12C01G53/44H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 郅晓科叶学海刘红光何爱珍章甦赵桢时洁
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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