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Preparation method of modified lithium ion battery positive electrode material

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of not improving Li+ efficiency, rate performance and long cycle performance, etc., and achieve good market promotion value, The effect of reducing the production of inactive substances and the process is simple and easy

Inactive Publication Date: 2019-04-05
JIANGSU RONGHUI GENERAL LITHIUM IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The commonly used coating agent is Al 2 o 3 、TiO 2 , AlPO 4 etc., but although these coating methods can reduce the surface alkalinity of high-nickel ternary materials, improve processing performance, and prevent HF from corroding active materials, these coating agents themselves have non-electrochemical activity and cannot improve Li + Efficiency in the deintercalation process, no significant improvement in rate performance and long cycle performance

Method used

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  • Preparation method of modified lithium ion battery positive electrode material
  • Preparation method of modified lithium ion battery positive electrode material
  • Preparation method of modified lithium ion battery positive electrode material

Examples

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Effect test

Embodiment 1

[0020] Dissolve 841.09g of nickel sulfate, 89.22g of manganese sulfate, and 112.46g of cobalt sulfate in 2L of deionized water, and dissolve 320g of sodium hydroxide in 2L of deionized water; add 2L of deionized water to a 10L reactor , add ammonia water dropwise, control the pH value of the reactor to 11.5, control the temperature of the reactor at 50° C., and pass nitrogen protection throughout. Add the above-mentioned dissolved metal salt solution, sodium hydroxide solution and 168.22 g of ammonia water dropwise into the reaction kettle at the same time, and keep the reaction temperature and pH value constant. The filter cake was dried under vacuum at 120°C to obtain a hydroxide precursor; the obtained precursor was mixed with lithium hydroxide at a Li / M molar ratio of 1.05, and the temperature was raised to 750°C at 2°C / min under an oxygen atmosphere 15h obtains lithium-ion battery cathode material. Disperse the above 10g of positive electrode material in 20mL aqueous sol...

Embodiment 2

[0023] Dissolve 946.22g of nickel sulfate, 44.61g of manganese sulfate, and 56.23g of cobalt sulfate in 2L of deionized water, and dissolve 320g of sodium hydroxide in 2L of deionized water; add 2L of deionized water to a 10L reactor , add ammonia water dropwise, control the pH value of the reactor to 11.5, control the temperature of the reactor at 50° C., and pass nitrogen protection throughout. Add the above-mentioned dissolved metal salt solution, sodium hydroxide solution and 168.22 g of ammonia water dropwise into the reaction kettle at the same time, and keep the reaction temperature and pH value constant. The filter cake was dried under vacuum at 120°C to obtain a hydroxide precursor; the obtained precursor was mixed with lithium hydroxide at a Li / M molar ratio of 1.05, and the temperature was raised to 750°C at 2°C / min under an oxygen atmosphere 15h obtains lithium-ion battery cathode material. Disperse the above 10g of positive electrode material in 20mL aqueous solu...

Embodiment 3

[0025] Dissolve 998.79g of nickel sulfate, 22.31g of manganese sulfate, and 28.12g of cobalt sulfate in 2L of deionized water, and dissolve 320g of sodium hydroxide in 2L of deionized water; add 2L of deionized water to a 10L reactor , add ammonia water dropwise, control the pH value of the reactor to 11.5, control the temperature of the reactor at 50° C., and pass nitrogen protection throughout. Add the above-mentioned dissolved metal salt solution, sodium hydroxide solution and 168.22 g of ammonia water dropwise into the reaction kettle at the same time, and keep the reaction temperature and pH value constant. Dry the filter cake under vacuum at 120°C to obtain a hydroxide precursor; mix the obtained precursor with lithium hydroxide at a Li / M molar ratio of 1.05, and raise the temperature to 750°C at 2°C / min under an oxygen atmosphere Insulated for 15 hours to obtain the positive electrode material of lithium ion battery. Disperse the above 10g of positive electrode materia...

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Abstract

The invention provides a preparation method of a modified lithium ion battery positive electrode material, and belongs to the technical field of lithium ion battery positive electrode materials. Firstly, a hydroxide composite precursor containing nickel, cobalt and manganese is prepared; Mixing the composite precursor with lithium hydroxide, and carrying out high-temperature sintering to obtain alithium ion battery positive electrode material; And finally, performing surface amorphous fast ion conductor coating modification on the obtained positive electrode material to obtain the lithium ionbattery positive electrode material with excellent performance. The surface of the modified lithium ion battery positive electrode material is coated with a layer of amorphous compound, so that the side reaction of an electrolyte and an active substance is favorably reduced, and the cycle performance of the positive electrode material is obviously improved. The process is simple and easy to implement, has low requirements on raw materials and equipment, has better product stability and meets the requirements of high-performance power battery materials. Good economic benefits and good market promotion values are achieved.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials of lithium ion batteries, in particular to a preparation method of modified lithium ion battery positive electrode materials. Background technique [0002] Since Sony mass-produced lithium-ion batteries, lithium-ion batteries have become the first choice for high energy density energy storage devices. With the vigorous development of new energy vehicles, the cruising range has become the main obstacle restricting the popularization of new energy vehicles, and lithium-ion batteries have become the core factor restricting the development. Compared with gasoline's energy density of 1300Wh / kg, the current energy density of lithium-ion batteries is only 200Wh / kg, so it is necessary to greatly increase the energy density of lithium-ion batteries. The key to improving the energy density of lithium batteries lies in the cathode material, so high-nickel (≥80%) ternary materials have a...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 李南平赵春松沙亚利何国端
Owner JIANGSU RONGHUI GENERAL LITHIUM IND CO LTD
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