Method for preparing anode materials lithium nickel manganese oxide with micron-size truncated octahedral structures

A technology of lithium nickel manganese oxide and positive electrode materials, which is applied in the direction of structural parts, chemical instruments and methods, battery electrodes, etc., can solve the problem of extending the migration path of lithium ions and electrons in size, shortening the migration path of Li ions and electrons, and aggravating the relationship between electrodes and electrodes. Solve problems such as electrolyte side reactions, achieve excellent cycle performance and rate performance, reduce insertion/extraction resistance, and improve rate performance

Active Publication Date: 2017-10-17
甘肃大象能源科技有限公司
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AI Technical Summary

Problems solved by technology

The nanoparticle material of lithium nickel manganese oxide has a high specific surface area, which is beneficial to the contact between the material and the electrolyte, shortens the migration path of Li ions and electrons, and improves the rate performance of the battery, but its larger contact area will intensify The side reaction between the electrode and the electrolyte shortens the service life of the battery
At the same time, although micron-sized particles with good crystal growth have good cycle performance, their larger size prolongs the migration path of lithium ions and electrons, reducing the battery rate performance
In addition, irregular particles will also affect the electrochemical performance of the battery

Method used

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  • Method for preparing anode materials lithium nickel manganese oxide with micron-size truncated octahedral structures
  • Method for preparing anode materials lithium nickel manganese oxide with micron-size truncated octahedral structures
  • Method for preparing anode materials lithium nickel manganese oxide with micron-size truncated octahedral structures

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preparation example Construction

[0013] The present invention is a preparation method of lithium nickel manganese oxide, a positive electrode material with a micron-sized truncated octahedral structure, the steps of which are as follows:

[0014] (1) At room temperature, with a molar ratio of 2.1:1:3, dissolve lithium salt, nickel salt and manganese salt in anhydrous ethanol solution, in which the molar concentration of manganese ions is 0.2~1.2 mol / L, and ultrasonically stir to obtain Clear and transparent solution;

[0015] (2) Add graphite to the above solution, the molar amount of graphite is 0.04 times that of manganese ions, and continue ultrasonic stirring for 1~6 h;

[0016] (3) Heat the obtained solution at 60-80 ℃ and evaporate to dryness, recover the solvent and obtain a black paste; dry the paste at 60-100 ℃ for 6-15 h;

[0017] (3) Ball mill the dried paste for 1-5 h, and then calcinate at 700-900 °C for 8-15 h to obtain lithium nickel manganese oxide with micron truncated octahedral structure. ...

Embodiment 1

[0023] (a) Dissolve 0.21 mol of lithium acetate, 0.1 mol of nickel acetate, and 0.3 mol of manganese acetate in 1 L of absolute ethanol solution;

[0024] (b) Add 0.012 mol of graphite and continue ultrasonic stirring for 3 h;

[0025] (c) The resulting solution was heated at 75 °C to recover the absolute ethanol solvent and obtain a black paste. The resulting paste was then dried in an oven at 75 °C for 10 h;

[0026] (d) After drying, ball mill for 2 h to ensure the uniform distribution of graphite as far as possible, and place the obtained powder in a muffle furnace for calcination at 850 °C for 10 h to obtain the following: figure 1 Lithium nickel manganese oxide material with truncated octahedral structure shown.

Embodiment 2

[0028] (a) Dissolve 0.21 mol lithium acetate, 0.1 mol nickel acetate, and 0.3 mol manganese acetate in 0.5 L absolute ethanol solution;

[0029] (b) Add 0.012 mol of graphite and continue ultrasonic stirring for 3 h;

[0030] (c) The resulting solution was heated at 75 °C to recover the absolute ethanol solvent and obtain a black paste. The resulting paste was then dried in an oven at 75 °C for 10 h;

[0031] (d) The dried material was ball milled for 2 h to ensure the uniform distribution of graphite, and the obtained powder was calcined in a muffle furnace at 850 °C for 10 h to obtain the following figure 2 Lithium nickel manganese oxide material with truncated octahedral structure shown.

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Abstract

The invention discloses a method for preparing anode materials lithium nickel manganese oxide with micron-size truncated octahedral structures. The method includes steps of (1), dissolving lithium salt, nickel salt and manganese salt in absolute ethyl alcohol solution at the room temperature according to a molar ratio of 2.1:1:3 and ultrasonically stirring the lithium salt, the nickel salt, the manganese salt and the absolute ethyl alcohol solution to obtain clear and transparent solution; (2), adding graphite into the solution and continuously ultrasonically stirring the graphite and the solution for 1-6 h; (3), heating and drying obtained solution by distillation at the temperatures of 60-80 DEG C, recycling solvents, preparing black paste and drying the paste at the temperatures of 60-100 DEG C for 6-15 h; (3), carrying out ball-milling treatment on dried paste for 1-5 h and then calcining the paste at the temperatures of 700-900 DEG C for 8-15 h to obtain the lithium nickel manganese oxide with the micron-size truncated octahedral structures. The molar concentration of manganese ions is 0.2-1.2 mol/L. The molar weight of the graphite is 0.04 times the molar weights of the manganese ions.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to the preparation technology of lithium nickel manganese oxide as a positive electrode material. Background technique [0002] As a new type of green high-energy battery, lithium-ion batteries are widely used in portable devices such as mobile phones and notebook computers because of their high operating voltage, long energy storage time, stable discharge, and no memory effect. However, the further application of high-power equipment such as power vehicles puts forward higher requirements on the energy density and power density of lithium-ion batteries. [0003] Compared with traditional commercial materials (lithium cobalt oxide, lithium iron phosphate, etc.), spinel lithium nickel manganese oxide has a high voltage platform (about 4.7 V) and high energy density (587-635 mWh g -1 ), rich raw materials, safety and environmental protection, etc., has become a strong c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2004/03C01P2004/61H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 崔孝玲李宏亮李世友解静耿珊李春雷
Owner 甘肃大象能源科技有限公司
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