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Rich-lithium ternary laminar lithium ion battery cathode material

A lithium-ion battery, ternary layered technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of uneven particles, low reaction efficiency, complex process, etc., to achieve uniform particle size, simple process, and cycle life prolonged effect

Inactive Publication Date: 2012-10-03
ZHUZHOU TAIHE HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation methods of lithium-ion battery cathode materials include solid phase method, molten salt method, aqueous solution method, co-precipitation method, hydrothermal method, ultrasonic spray pyrolysis method, template method, sol-gel method, etc., but they all have their own advantages and disadvantages. Disadvantages, such as high cost, harsh conditions, uneven particles, low reaction efficiency, complicated process, etc.

Method used

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  • Rich-lithium ternary laminar lithium ion battery cathode material

Examples

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Effect test

Embodiment 1

[0029] The preparation chemical formula is Li 1.2 mn 0.56 Ni 0.16 co 0.08 o 2 Lithium manganese oxide cathode material. According to the stoichiometric ratio of 1.2:0.56:0.16:0.08, 0.12 mol lithium acetate, 0.056 mol manganese acetate, 0.016 mol nickel acetate, 0.008 mol cobalt acetate and 0.1 mol alginic acid were weighed and dissolved in 500 ml deionized water, controlled at 70 °C, and then Add ammonia water dropwise to control the pH value to 7, and keep stirring until the water evaporates to dryness. After obtaining the sol-gel precursor, it is placed in vacuum drying at 120 °C for 12 h, and then calcined in a muffle furnace at 550 °C for 5 h in an air atmosphere. , the heating rate was 5 ℃ / min, after natural cooling, it was taken out and ground, and then calcined at 900 ℃ for 15 h, the heating rate was 5 ℃ / min, and then it was naturally lowered to room temperature. The prepared material was assembled into a button battery, and the charge and discharge test was carrie...

Embodiment 2

[0031] The preparation chemical formula is Li 1.2 mn 0.524 Ni 0.176 co 0.1 o 2 Lithium manganese oxide cathode material. Weigh 0.12 mol of lithium acetate, 0.0524 mol of manganese acetate, 0.0176 mol of nickel acetate, 0.01 mol of cobalt acetate and 0.14 mol of ammonium oxalate according to the stoichiometric ratio of 1.2:0.524:0.176:0.1 and dissolve them in 500 ml of deionized water at 70°C, then Ammonia water was added dropwise to control the pH value to 7, and stirring was continued until the water was evaporated to dryness. After the sol-gel precursor was obtained, it was vacuum-dried at 120 °C for 12 h, and then calcined at 550 °C for 5 h in an air atmosphere in a muffle furnace. The heating rate was 5 ℃ / min. After natural cooling, the samples were taken out and ground, and then calcined at 900 ℃ for 15 h. The heating rate was 5 ℃ / min, and then dropped to room temperature naturally. The prepared material was assembled into a button battery, and the charge and dischar...

Embodiment 3

[0033] The preparation chemical formula is Li 1.2 mn 0.524 Ni 0.176 co 0.1 o 2 Lithium manganese oxide cathode material. According to the stoichiometric ratio of 1.2:0.524:0.176:0.1, 0.12 mol lithium acetate, 0.0524 mol manganese acetate, 0.0176 mol nickel acetate, 0.01 mol cobalt acetate and 0.14 mol malic acid were weighed and dissolved in 500 ml deionized water, controlled at 70 °C, and then Ammonia water was added dropwise to control the pH value to 7, and stirring was continued until the water evaporated to dryness. After obtaining the sol-gel precursor, it was vacuum-dried at 120 °C for 12 h, and then calcined at 550 °C for 5 h in an air atmosphere in a muffle furnace. The heating rate was 5 ℃ / min. After natural cooling, the samples were taken out and ground, and then calcined at 900 ℃ for 15 h. The heating rate was 5 ℃ / min, and then dropped to room temperature naturally. The prepared material was assembled into a button battery, and the charge-discharge test was pe...

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Abstract

The invention discloses a rich-lithium ternary laminar lithium ion battery cathode material, which has a molecular formula of Li<1+alpha> MnxNiyCozO2, wherein alpha is greater than 0.05 but smaller than 0.5, x is greater than 0.5 but smaller than 0.8, y is greater than 0.05 but smaller than 0.2, z is greater than 0.05 but smaller than 0.2, and the sum of x, y and z is 1. According to a method, a sol-gel method is adopted for preparing the cathode material. The method comprises the following preparation processes that metal salts of soluble manganese sources, nickel sources, cobalt sources and lithium sources are dissolved in water, then, acid complexing agents are added, ammonia water is used for regulating the pH value to be 6 to 8, next, the stirring is carried out at 60 to 90 DEG C, in addition, the water is dried through evaporation, sol-gel precursors are obtained, blocky porous loose precursors are obtained through vacuum drying, then, the ball milling, the pre-sintering, the sintering and the ball milling are carried out, and finally, the cathode material is obtained. The obtained material has the advantages that particles are more uniform and are in the nanometer level, in addition, a battery is assembled for carrying out electrochemical test, and higher capacity and excellent circulation performance are realized.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery, in particular to a lithium-rich ternary layered positive electrode material, which can effectively increase the specific capacity of the ternary layered positive electrode material and improve cycle performance. Background technique [0002] Due to the rapid development of science and technology, people's living standards have been greatly improved, especially in recent decades, chemical power sources have developed rapidly. As the demand for chemical batteries is constantly improving from quantity to quality, especially in the fields of electronics, communications, automobiles, and aerospace, batteries that are small in size, light in weight, high in energy, high in power, long in life, low in cost, and environmentally friendly are required increasingly urgent. At present, most commercial lithium-ion cathode materials use lithium-cobalt-manganese-nickel ternary layered m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 郑圣泉陈红雨杨欢
Owner ZHUZHOU TAIHE HIGH TECH
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