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High-nickel ternary positive electrode material with monocrystal morphology and preparation method of high-nickel ternary positive electrode material

A positive electrode material and morphology technology, which is applied in the field of single-crystal high-nickel ternary positive electrode materials and its preparation, can solve the problems of strict requirements in the cell preparation process, poor high-temperature storage performance, and limited energy density, and achieve increased Effect of coating process, improvement of processability, improvement of particle size distribution

Inactive Publication Date: 2018-05-11
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high-nickel ternary materials still have the following disadvantages: (1) The compaction density is still low, which limits the further improvement of energy density; (2) The residual total alkali content is high, which leads to strict requirements on the cell preparation process. Poor high temperature storage performance

Method used

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  • High-nickel ternary positive electrode material with monocrystal morphology and preparation method of high-nickel ternary positive electrode material
  • High-nickel ternary positive electrode material with monocrystal morphology and preparation method of high-nickel ternary positive electrode material
  • High-nickel ternary positive electrode material with monocrystal morphology and preparation method of high-nickel ternary positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0064] (1) preparation is by Ni: Co: solution A of Mn molar ratio 8.0: 1.0: 1.0, metal ion concentration is 1.5mol / L, preparation concentration is the NaOH solution of 5mol / L; Preparation concentration is the ammoniacal solution of 9mol / L; Put solution A (flow rate 30ml / min), NaOH solution (flow rate 10ml / min), and ammonia solution (flow rate 8ml / min) into the reaction kettle at the same time, control the pH to 11.5-12.5, and react at a temperature of 50°C. After 20 hours, After the reaction is completed, after aging, washing and drying, the precursor Ni with a D50 of 3 μm is obtained. 0.8 co 0.1 mn 0.1 (OH) 2 ;

[0065] (2) the precursor described in step (1), and lithium hydroxide, ZrO 2 Mixing, wherein, the molar ratio of lithium:transition metal (Ni+Co+Mn) is 1.04, the amount of Zr added is 0.005 of the amount of (Ni+Co+Mn) substances, and sintered in an oxygen atmosphere at 840°C for 15 hours. After cooling and crushing, the base material is obtained;

[0066] (3) A...

Embodiment 2

[0072] (1) The preparation method of the precursor is similar to Example 1, except that the molar ratio of Ni:Co:Mn is changed to 8.3:1.2:0.5, and the precursor Ni with a D50 of 3 μm is obtained. 0.83 co 0.12 mn 0.05 (OH) 2 ;

[0073] (2) Mix the precursor described in step (1) with lithium hydroxide and additive MgO. Among them, the molar ratio of lithium:transition metal (Ni+Co+Mn) is 1.04, the amount of Mg added is 0.003 of the amount of (Ni+Co+Mn) material, and sintered in an oxygen atmosphere at 840 ° C for 12 hours. After cooling, The base material is obtained after pulverization;

[0074] (3) After washing and drying the substrate described in step (2), uniformly mix it with barium nitrate, the amount of Ba added is 0.004 of the amount of (Ni+Co+Mn) substance, and then sintering at 400° C. in an oxygen atmosphere, The sintering time is 12h, and the single-crystal high-nickel ternary positive electrode material is obtained, and the base material is LiNi 0.832 co 0...

Embodiment 3

[0080] (1) The preparation method of the precursor is similar to Example 1, except that the molar ratio of Ni:Co:Mn is changed to 8.8:1.2:0.5, and the precursor Ni with a D50 of 3 μm is obtained. 0.88 co 0.18 mn 0.05 (OH) 2 ;

[0081] (2) the precursor described in step (1), and lithium hydroxide, additive Nb 2 o 5 Mixing, wherein, the molar ratio of lithium:transition metal (Ni+Co+Mn) is 1.03, the amount of Nb added is 0.002 of the amount of (Ni+Co+Mn) substance, sintering in an oxygen atmosphere at 830 ° C, sintering time 12h, after After cooling and crushing, the base material is obtained;

[0082] (3) Wash and dry the base material obtained above, and evenly mix it with nano-sized alumina. The amount of Al added is 0.005 of the amount of (Ni+Co+Mn) substance; then sintered at 750°C in an oxygen atmosphere, and the sintering time For 12h, the high-nickel ternary positive electrode material with single crystal morphology is obtained, and its base material is LiNi 0.87...

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Abstract

The invention discloses a high-nickel ternary positive electrode material with monocrystal morphology and a preparation method of the high-nickel ternary positive electrode material. The preparation method comprises the following steps of (1) mixing a soluble nickel salt, a soluble cobalt salt, a soluble manganese salt, a precipitant and a complexing agent, and performing heating reaction to obtain a precursor; (2) mixing the precursor, a lithium compound and a doping metal compound, and sintering in an oxygen atmosphere to obtain a base material; (3) mixing the base material and a detergent,performing stirring, centrifuging and drying, and uniformly mixing with a coating agent to obtain a coated product; and (4) sintering the coated product to obtain the high-nickel ternary positive electrode material with monocrystal morphology. The high-nickel positive electrode material prepared by the method has morphology similar to that monocrystal, and is high in compaction density and energydensity, low in resided alkali amount and good in processability; and meanwhile, with the introduction of a doping element, a lithium ion battery prepared from the high-nickel positive electrode material has relatively high cycle property, and the cycle property and the safety of the material are also improved by the coating layer.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials, in particular to a single-crystal high-nickel ternary positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high specific capacity, environmental friendliness, and no memory effect, which are making them widely used in people's daily life, becoming a source of portable power, and the energy density of batteries is also increasing. [0003] Lithium Cobalt Oxide LiCoO 2 Compared with ternary materials (LiNi 0.5 co 0.2 mn 0.3 o 2 etc.) low, resulting in the battery energy density can not be made high, therefore, more and more cell manufacturers began to gradually use ternary materials, according to statistics, LiCoO 2 shipments have declined considerably. At present, the development direction of ternary materials is biased towards high voltage or high-nickel ternary materials. Among them, hi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 李扬袁徐俊佘圣贤黄连友
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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