High-voltage high-capacity anode material for lithium ion battery and preparation method of anode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as coating uniformity, inconsistency in roasting temperature, and product consistency, and achieve good thermal cycle performance, Solve the effect that the roasting temperature cannot be unified and has good consistency

Inactive Publication Date: 2014-03-05
NANTONG RESHINE NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the coating modification process, the methods used are still the conventional sol-gel method, solution adsorption method, etc. These methods are acceptable for coating inactive substances, but for coating active substances, there are many Problems, for example, the firing temperature between the base material and the modified layer cannot be unified, the product consistency problem, or the coating uniformity problem, etc.

Method used

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  • High-voltage high-capacity anode material for lithium ion battery and preparation method of anode material
  • High-voltage high-capacity anode material for lithium ion battery and preparation method of anode material
  • High-voltage high-capacity anode material for lithium ion battery and preparation method of anode material

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Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 , 2 , 3 and 4.

[0032] (1) Using battery-grade cobalt oxyhydroxide (D50 of 8 μm), battery-grade lithium hydroxide, magnesium oxide, and aluminum oxide as raw materials, the molar ratio of Li:Co is 1.06, the addition of aluminum is 0.1 wt%, and the addition of magnesium The amount is 1 wt%, placed in a dry mixer and mixed evenly.

[0033] (2) Sinter the materials in step (1). The temperature in the main temperature zone of sintering is 900°C, and the sintering time is 15.5h. 3 / h, the sintered lithium cobalt oxide is processed by crushing, crushing, grading, sieving and other processes.

[0034] (3) In a wet environment, combine a mixed solution of Ni, Co, and Mn salts with a concentration of 0.5 to 3 mol / L, a NaOH solution with a concentration of 1 to 10 mol / L, and a complexing agent solution of 0.5 to 200 g / L Add it into the reaction vessel, control the appropriate temperature, pH value and stirring conditions, and then go through drying, classifi...

Embodiment 2

[0040] (1) Use battery-grade cobalt tetroxide (D50 is 11 μm), battery-grade lithium hydroxide, and zirconia as raw materials, the molar ratio of Li:Co is 0.95, and the addition of zirconium is 0.01 wt%, and they are placed in a dry mixer and mixed evenly .

[0041] (2) Sinter the materials in step (1). The temperature in the main temperature zone of sintering is 500°C, and the sintering time is 40h. The whole sintering process is carried out in an air atmosphere, and the ventilation rate in the main temperature zone is controlled at 2m 3 / h, the sintered lithium cobalt oxide is crushed, crushed, classified, sieved and other processes to obtain a semi-finished product of lithium cobalt oxide.

[0042] (3) Coat the semi-finished lithium cobalt oxide synthesized in step (2), and the coating material is LiNi 0.5 mn 0.2 co 0.3 o 2 (D50 is 5 μm), and its coating amount is 0.01 wt%. The coating method adopts dry coating. This equipment has high impact force and high shear force...

Embodiment 3

[0047] (1) Using battery-grade cobalt oxyhydroxide (D50 is 25 μm), battery-grade lithium hydroxide, titanium oxide, and zirconium oxide as raw materials, the molar ratio of Li:Co is 1.2, the addition of titanium is 5 wt%, and the addition of zirconium The amount is 5 wt%, placed in a dry mixer and mixed evenly.

[0048] (2) Sinter the materials in step (1). The temperature of the main temperature zone for sintering is 1350°C, and the sintering time is 5 hours. The whole sintering process is carried out in an air atmosphere, and the ventilation rate of the main temperature zone is controlled at 30m 3 / h, the sintered lithium cobalt oxide is crushed, crushed, classified, sieved and other processes to obtain a semi-finished product of lithium cobalt oxide.

[0049] (3) Coat the semi-finished lithium cobalt oxide synthesized in step (2), and the coating material is LiNi 0.7 mn 0.15 co 0.15 o 2 (D50 is 5 μm), and its coating amount is 20 wt%. The coating method adopts wet coat...

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Abstract

The invention discloses a high-voltage high-capacity anode material for a lithium ion battery. The anode material contains a cobalt source substance, a lithium source substance, a dopant M and a coating material, wherein the molar ratio of Li to Co is 0.95-1.2, the doping amount of the dopant M is 0.01-10wt%, and the total doping amount of the coating material is 0.01-20wt%. The structural stability of lithium cobalt oxide is enhanced by means of doping, the advantages of the lithium cobalt oxide in a base layer and the active material in a coating layer are complemented mutually by means of coating with an active substance, so that the electrochemical performance of the anode material is enhanced; stable cycling can be achieved under the condition of high voltage of 3.0-4.5V and the anode material has excellent electrochemical performance. In a word, the anode material has the advantages of high voltage platform, high reversible specific capacity, excellent thermal cycling performance, stable structure, good safety and the like; the problem that the calcination temperature of the base layer and the coating layer cannot be unified is solved and the anode material has excellent uniformity.

Description

technical field [0001] The invention relates to the fields of energy storage materials and electrochemistry, in particular to a high-voltage, high-capacity lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] With the rapid development of technology and economy in modern society, the demand for lithium-ion batteries is increasing, and the requirements are becoming higher and higher. At present, lithium-ion batteries are not only widely used in electronic information equipment, but also in aerospace technology and military fields, and have higher requirements, such as: high specific energy, high specific power, fast charging, low cost, and good safety. wait. [0003] As a cathode material for lithium-ion batteries, lithium cobalt oxide has the advantages of high working voltage, high energy density, easy synthesis and fast charge and discharge, so it is widely used. However, in the case of deep charge and discharge, the struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/62
CPCY02E60/122H01M4/366H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 李兴翠池田一崇尹雄鸽王文博高林周贵海
Owner NANTONG RESHINE NEW MATERIAL
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