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High-voltage lithium cobalt oxide positive electrode material and preparation method thereof

A cathode material, lithium cobalt oxide technology, used in battery electrodes, circuits, electrical components, etc., can solve problems such as internal structure collapse, rate deterioration, and accelerated reactions

Active Publication Date: 2019-03-12
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium cobalt oxide will cause structural instability as more lithium ions are extracted from the crystal lattice at higher voltages, accelerate the reaction with the electrolyte, cause the internal structure to collapse, and affect the service life of high-voltage lithium cobalt oxide.
[0003] Patent CN102583585A prepares lithium cobalt oxide by doping Mg, Al, Ti and other inert elements, which improves the stability of the lithium cobalt oxide structure, but the use of inert elements leads to a decrease in the capacity rate performance of the material
Patent CN10391561A improves the circulation and high-temperature storage performance of lithium cobaltate particles by coating Mg and Al. Similarly, the use of inert elements such as Mg and Al will reduce capacity and deteriorate performance such as rate

Method used

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  • High-voltage lithium cobalt oxide positive electrode material and preparation method thereof
  • High-voltage lithium cobalt oxide positive electrode material and preparation method thereof
  • High-voltage lithium cobalt oxide positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Prepare 475L of cobalt chloride solution with a concentration of 2mol / L, prepare 20L of nickel-manganese nitrate binary mixed solution with a concentration of 2mol / L (Ni:Mn=1:3), and prepare 20L of lanthanum nitrate solution with a concentration of 0.5mol / L , prepare a sodium carbonate solution with a concentration of 2mol / L as a precipitant. The cobalt nitrate solution, the nickel-manganese binary solution and the sodium carbonate solution are put into different containers respectively, and the cobalt nitrate solution is put into a stirring container.

[0031] The nickel-manganese binary solution is continuously added to the cobalt nitrate solution, and stirred to obtain a mixed salt solution, and at the same time, the mixed salt solution and the sodium carbonate solution are co-flowed into a stirred reactor for reaction to obtain a precursor slurry. During the whole reaction process, the reaction temperature was 50° C., and the reaction time was 20 h. The precursor s...

Embodiment 2

[0035] Prepare 970L of cobalt sulfate solution with a concentration of 1mol / L, prepare 20L of nickel-manganese sulfate binary mixed solution with a concentration of 1mol / L (Ni:Mn=1:3), prepare 50L of yttrium nitrate solution with a concentration of 0.2mol / L, A sodium carbonate solution with a concentration of 1 mol / L was prepared as a precipitating agent. The cobalt sulfate solution, the nickel-manganese binary solution and the sodium carbonate solution are put into different containers respectively, and the cobalt sulfate solution is put into a container with stirring.

[0036]The nickel-manganese binary solution is continuously added to the cobalt sulfate solution, and stirred to obtain a mixed salt solution, and at the same time, the mixed salt solution and sodium carbonate solution are co-flowed into a stirred reactor for reaction to obtain a precursor slurry. During the whole reaction process, the reaction temperature was 40° C., and the reaction time was 30 h. The precu...

Embodiment 3

[0040] Prepare 186L of cobalt acetate solution with a concentration of 0.5mol / L, prepare 12L of nickel-manganese acetate binary mixed solution with a concentration of 0.5mol / L (Ni:Mn=1:3), and prepare a samarium nitrate solution with a concentration of 0.1mol / L 10L, prepare a sodium carbonate solution with a concentration of 0.5mol / L as a precipitant. The cobalt acetate solution, the nickel-manganese binary solution and the sodium carbonate solution are put into different containers respectively, wherein the cobalt acetate solution is put into a container with stirring.

[0041] The nickel-manganese binary solution is continuously added to the cobalt acetate solution, and stirred to obtain a mixed salt solution, and at the same time, the mixed salt solution and sodium carbonate solution are co-flowed into a stirred reactor for reaction to obtain a precursor slurry. During the whole reaction process, the reaction temperature was 60° C., and the reaction time was 50 h. The prec...

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Abstract

The invention discloses a novel high-voltage lithium cobalt oxide material and a preparation method thereof, and belongs to the field of positive electrode materials of lithium-ion batteries. The material comprises a core-shell structure, an inner core is made of lithium cobalt oxide particles doped with nickel and manganese in a gradient manner, and a shell is an in-situ produced spinel LiNi0.5Mn1.5O4 wrapping layer doped with rare earth. The invention also relates to a preparation method of the material, the lithium cobalt oxide material with gradient doping of the inner core and surface in-situ wrapping can be obtained by once sintering, the process is simple, the operation process is controllable, and the prepared lithium cobalt oxide material has better structural stability, higher discharging capacity and excellent circulation performance in a high voltage.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a high-voltage lithium cobalt oxide cathode material and a preparation method thereof. Background technique [0002] With the advantages of small self-discharge, high energy density, and no memory effect, lithium-ion batteries are widely used in many fields such as mobile electronic devices, power tools, and electric vehicles. The performance of lithium-ion batteries is mainly determined by the quality of the cathode material. At present, lithium cobalt oxide is one of the most widely used cathode materials in the market. With the continuous advancement of technology, the market has put forward higher requirements for the capacity, cycle and safety performance of lithium cobalt oxide, that is, lithium cobalt oxide materials with higher voltage resistance. However, lithium cobalt oxide will cause structural instability as more lithium ion...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 李栋梁刘亚飞陈彦彬岳鹏陈宝海
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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