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High-crystallinity submicron nickel-cobalt-manganese ternary positive electrode material and preparation method thereof

A sub-micron, cathode material technology, used in electrical components, battery electrodes, structural parts, etc., can solve the problems of increasing the transport distance of lithium ions and electrons, decreasing cycle stability, and easily broken secondary particles. Improve compaction density and cycle stability, improve cycle stability, and reduce the effect of cation mixing

Inactive Publication Date: 2019-11-22
GUIZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the prepared ternary positive electrode materials are secondary spherical particles formed by the agglomeration of primary particles. The secondary particles are easily broken during the process, which reduces the cycle stability
[0003] In response to the above problems, the researchers prepared a micron-scale single crystal ternary cathode material. In CN106410182A, a method for preparing a high compacted density micron-scale single crystal ternary cathode material published in 2017, by adding additives and in the presence of oxygen and nitrogen The micron-sized single crystal ternary cathode material with high compaction density can be obtained by calcining in the mixed gas of high compaction density, but this process requires the addition of additives and the mixed gas of oxygen and nitrogen, and the obtained material has a large particle size, with a maximum particle size of about 7 μm The size increases the transport distance of lithium ions and electrons in the material to a certain extent, thus affecting the performance
There are also researchers (Kim Y. Lithium nickel cobalt manganese oxide synthesized using alkalichloride flux: morphology and performance as a cathode material for lithiumion batteries[J]. ACS applied materials & interfaces, 2012, 4(5): 2329-2333.) adopted Fluxes such as KCl or NaCl synthesize primary particle ternary cathode materials at high temperatures, but this process requires a flux and sintering at a high temperature of 800-1000°C, which increases the cost

Method used

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Examples

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Embodiment 1

[0039] Example 1. A highly crystalline submicron nickel-cobalt-manganese ternary positive electrode material and a preparation method thereof, comprising the following steps:

[0040] (1) The total molar concentration of nickel, cobalt and manganese metal elements is a mixed salt solution of 1mol / L nickel, cobalt and manganese, a mixed alkaline solution of 1mol / L sodium carbonate and 0.2mol / L ammonia water, and added to the bottom solution as In 25ml of ethanol aqueous solution, control the pH value of the bottom liquid solution to 7, heat and stir at 1200r / min at a temperature of 45°C for 10h to form a suspension, filter, take the solid, wash 4 times, and dry at a temperature of 105 In the blast drying oven at ℃, dry for 12h to obtain a ternary precursor; the mixed salt solution of nickel, cobalt and manganese is sulfate, and the moles of Ni, Co and Mn elements in the mixed salt solution of nickel, cobalt and manganese Ratio is 5:2:3, ethanol solution is used as bottom liqui...

Embodiment 2

[0042] Example 2. A highly crystalline submicron nickel-cobalt-manganese ternary positive electrode material and a preparation method thereof, comprising the following steps:

[0043] (1) The total molar concentration of nickel, cobalt and manganese metal elements is a mixed salt solution of 1mol / L nickel, cobalt and manganese, a mixed alkaline solution of 1mol / L sodium carbonate and 0.2mol / L ammonia water, and added to the bottom solution as In 25ml of ethanol aqueous solution, control the pH value of the bottom liquid solution to 8, heat and stir at 1200r / min at a temperature of 45°C for 10h to form a suspension, filter, take the solid, wash 4 times, and dry at a temperature of 105 In the blast drying oven at ℃, dry for 12h to obtain a ternary precursor; the mixed salt solution of nickel, cobalt and manganese is sulfate, and the moles of Ni, Co and Mn elements in the mixed salt solution of nickel, cobalt and manganese Ratio is 5:2:3, ethanol solution is used as bottom liqui...

Embodiment 3

[0045] Example 3. A highly crystalline submicron nickel-cobalt-manganese ternary positive electrode material and a preparation method thereof, comprising the following steps:

[0046] (1) The total molar concentration of nickel, cobalt and manganese metal elements is the mixed alkaline solution of 1mol / L nickel, cobalt and manganese salt solution, 1mol / L sodium carbonate and 0.2mol / L ammonia water, which is added to the bottom solution. In 25ml of ethanol aqueous solution, control the pH value of the bottom liquid solution to 10, heat and stir at 1200r / min at a temperature of 45°C for 10h to form a suspension, filter, take the solid, wash 4 times, and dry at a temperature of 105 In the blast drying oven at ℃, dry for 12h to obtain a ternary precursor; the mixed salt solution of nickel, cobalt and manganese is a chloride salt, and the mixed salt solution of nickel, cobalt and manganese contains elements of Ni, Co and Mn The molar ratio is 5:2:3, the ethanol solution is used as...

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Abstract

The invention discloses a high-crystallinity submicron nickel-cobalt-manganese ternary positive electrode material and a preparation method thereof. An ethanol solution is used as a base solution, a mixed salt solution and a mixed alkali solution are added into the base solution to prepare the material. The method includes (1) adding the mixed salt solution of nickel, cobalt and manganese, and themixed alkali solution of sodium carbonate and ammonia water into alkali base solution, heating and stirring the mixture to form a suspension, filtering the suspension to obtain a solid, and washing and drying the solid to obtain a ternary precursor; and (2) mixing a lithium salt and the ternary precursor according to a molar ratio that Li:(Ni + Co + Mn) = (1-1.2):1, grinding the mixture, carryingout low-temperature presintering, carrying out heat preservation sintering, and cooling to obtain the high-crystallinity submicron nickel-cobalt-manganese ternary positive electrode material. The preparation method disclosed by the invention has the beneficial effects that an additive or an auxiliary agent is not required to be used, the high-crystalline submicron nickel-cobalt-manganese ternarypositive electrode material with uniformly dispersed particles is obtained, and the cycling stability of the battery is favorably improved.

Description

technical field [0001] The invention relates to a nickel-cobalt-manganese ternary positive electrode material, in particular to a highly crystalline submicron nickel-cobalt-manganese ternary positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, low self-discharge rate and low environmental pollution, and have been widely used in various portable electronic digital products. In recent years, the rapid rise of the new energy vehicle industry has put forward higher requirements for the performance of lithium-ion batteries. While meeting safety and cycle performance, they must also have high energy density. Among them, the characteristics of cathode materials are the key factors that determine the performance of lithium-ion batteries. Among the developed cathode materials, ternary nickel-cobalt-manganese materials are favored by research...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 戴新义解艳芳吴复忠李军旗
Owner GUIZHOU UNIV
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