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Hollow sphere anode material and preparation method thereof

A technology of positive electrode materials and hollow spheres, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of cycle performance, poor rate performance, restrictions on the industrial application of materials, and large irreversible capacity, and achieve small capacity decay and excellent cycle performance and rate performance, the effect of good structural stability

Active Publication Date: 2017-05-31
上海鎏明科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium-rich manganese-based cathode materials also have the following disadvantages: 1. Poor cycle performance and rate performance; 2. Large initial irreversible capacity; 3. Serious voltage attenuation
These problems have seriously restricted the industrial application of the above materials.

Method used

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  • Hollow sphere anode material and preparation method thereof
  • Hollow sphere anode material and preparation method thereof
  • Hollow sphere anode material and preparation method thereof

Examples

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preparation example Construction

[0031] The invention provides a method for preparing a hollow spherical positive electrode material, which includes preparing a nickel oxide precursor, preparing a second mixed solution and preparing a hollow spherical positive electrode material.

[0032] S1. Preparation of NiO precursor:

[0033] The first mixed solution containing glucose and nickel ammonium sulfate is hydrothermally reacted to obtain the first suspension; the first suspension is dried to obtain the first precipitate of solid spheres; the first precipitate is calcined to obtain nickel oxide of hollow spheres precursor;

[0034] Specifically, the step of preparing the nickelous oxide precursor includes the preparation of the first mixed liquid, the first suspension, the first precipitate and the nickelous oxide precursor.

[0035] S101, preparation of the first mixed solution:

[0036] Get glucose and ammonium nickel sulfate dissolved in deionized water to obtain the first mixed solution, and stir the firs...

Embodiment 1

[0065] This embodiment provides a method for preparing a hollow spherical positive electrode material, comprising the following steps:

[0066] S1. Preparation of NiO precursor:

[0067] Get 228mmol glucose and 45.6mmol nickel sulfate ammonium and dissolve in 360ml deionized water to obtain the first mixed solution, stir the first mixed solution evenly under magnetic stirring; At a stirring speed of 4°C / min, the temperature was raised to 180°C at a heating rate of 4°C / min, kept at 180°C for 24 hours, and then cooled to room temperature at a cooling rate of 3°C / min to obtain the first suspension; the first suspension was filtered To obtain a precipitate, wash the precipitate with deionized water 3 times, wash with ethanol 2 times, and vacuum dry it in a vacuum oven at 100°C for 10 hours to obtain the first precipitate; put the above first precipitate into a corundum magnetic boat in a tube furnace Pyrolysis under medium air atmosphere, the tube furnace is controlled to raise t...

Embodiment 2

[0078] This embodiment provides a hollow sphere positive electrode material, which has nanometer-sized primary particles stacked into a micron-sized hollow sphere structure.

[0079] This embodiment provides a method for preparing a hollow spherical positive electrode material, comprising the following steps:

[0080] S1. Preparation of NiO precursor:

[0081] Get 220mmol glucose and 46mmol nickel sulfate ammonia and dissolve in 360ml deionized water to obtain the first mixed solution, stir the first mixed solution evenly under magnetic stirring; Under the stirring speed of 3°C / min, the temperature was raised to 190°C at a heating rate of 3°C / min, kept at 190°C for 20 hours, and then cooled to room temperature at a cooling rate of 5°C / min to obtain the first suspension; the first suspension was filtered To obtain a precipitate, wash the precipitate with deionized water 3 times, wash with ethanol 2 times, and vacuum dry it in a vacuum oven at 100°C for 10 hours to obtain the f...

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Abstract

The invention relates to the synthesis of an anode material for a lithium ion battery, and provides a hollow sphere anode material and a preparation method thereof. The preparation method comprises the following steps of enabling first mixed liquor containing glucose and nickel ammonium sulfate to subject to hydrothermal reaction to obtain first suspension liquid; drying the first suspension liquid to obtain first sediment of solid spheres; roasting the first sediment to obtain hollow spheres and a nickel protoxide precursor; mixing manganese acetate, lithium acetate and a solvent to obtain second mixed liquor; mixing and evaporating the second mixed liquor and the nickel protoxide precursor to obtain second sediment, and roasting the second sediment to obtain the hollow sphere anode material; the anode material is formed by packing nano-sized primary particles into micron-sized hollow sphere secondary particles. A hollow sphere micron-sized matrix structure can slow down the dissolution of the primary particles in electrolyte in a continuous cyclic process, so that the hollow sphere anode material cannot easily collapse in the cyclic process, showing excellent electrochemical performance.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a hollow spherical positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary rechargeable battery, which has been widely used at present. Lithium-ion batteries are generally composed of positive electrodes, negative electrodes, diaphragms, electrolytes, and battery casings. The cost of positive electrode materials accounts for more than 40% of the battery, but the specific capacity of positive electrode materials is far lower than that of negative electrode materials. Therefore, Lithium batteries have important application value in research. [0003] Due to the transition metal oxide LiMO 2 (The composition of M=Co, Mn, Ni several elements) is not ideal in terms of cycle performance, cost and preparation process, especially the lower cost LiMnO among the three 2 The phase ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/364H01M4/505H01M4/525Y02E60/10
Inventor 周天池王斌熊万军仇如成
Owner 上海鎏明科技有限公司
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