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Method for one-step low-temperature preparation of large-particle-size single-crystal ternary positive electrode material

A positive electrode material, large particle size technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of wide particle size distribution, high sintering temperature, poor consistency, etc., to achieve large particle size, high mechanical strength, and stable structure good sex effect

Pending Publication Date: 2022-06-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above-mentioned deficiencies currently existing, the present invention provides a method for preparing a large-size single-crystal ternary cathode material in one step at low temperature. This application can overcome the high sintering temperature, wide particle size distribution, and poor consistency of the existing single-crystal preparation technology. The problem

Method used

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  • Method for one-step low-temperature preparation of large-particle-size single-crystal ternary positive electrode material
  • Method for one-step low-temperature preparation of large-particle-size single-crystal ternary positive electrode material
  • Method for one-step low-temperature preparation of large-particle-size single-crystal ternary positive electrode material

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Embodiment 1

[0039] Accurately weigh 3mol Ni according to Li:(Ni+Co+Mn)=1.03 0.90 Co 0.06 Mn 0.04 (OH) 2 Precursor, 3.09mol LiOH·H 2 O, 0.003mol (0.1mol%) nano-strontium titanate, the precursor, lithium salt and nano-flux were mixed in a high-speed mixer for 3 minutes; in an oxygen atmosphere ≥ 98%, the air flow rate was controlled to 4.8m 3 / h, raise the temperature to 500°C for 3 hours at a heating rate of 3°C / min, continue to increase to 835°C at the same heating rate and maintain a constant temperature for 12 hours, and cool to room temperature with the furnace to obtain a ternary cathode material.

Embodiment 2

[0041] Accurately weigh 3mol Ni according to Li:(Ni+Co+Mn)=1.03 0.90 Co 0.06 Mn 0.04 (OH) 2 Precursor, 3.09mol LiOH·H 2 O, 0.0015mol (0.05mol%) nano-strontium titanate, the precursor, lithium hydroxide monohydrate, nano-flux were mixed in a high-speed mixer for 3 minutes; in an oxygen atmosphere ≥ 98%, the control air flow was 4.8m 3 / h, raise the temperature to 500°C for 3 hours at a heating rate of 3°C / min, continue to rise to 815°C at the same heating rate and maintain the constant temperature for 12 hours, and cool to room temperature with the furnace to obtain a ternary cathode material.

Embodiment 3

[0043] Accurately weigh 3mol Ni according to Li:(Ni+Co+Mn)=1.03 0.90 Co 0.06 Mn 0.04 (OH) 2 Precursor, 3.09mol LiOH·H 2 O, 0.006mol (0.2mol%) nanometer strontium titanate, the precursor, lithium hydroxide monohydrate, and nanoflux were mixed in a high-speed mixer for 3 minutes; in an oxygen atmosphere ≥98%, the control air flow was 4.8m 3 / h, heat up to 500°C for 3 hours at a heating rate of 3°C / min, continue to rise to 825°C at the same heating rate and maintain a constant temperature for 12 hours, and cool to room temperature with the furnace to obtain a ternary cathode material.

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Abstract

The invention discloses a method for one-step low-temperature preparation of a large-particle-size single-crystal ternary positive electrode material. The method comprises the following steps: uniformly mixing a precursor, a lithium source and a nano fluxing agent; carrying out high-temperature solid-phase sintering in an oxygen atmosphere; and crushing and screening the sintered material. The invention provides the method for preparing the large-particle-size single crystal ternary positive electrode material at low temperature in one step, the prepared ternary positive electrode material has highly dispersed large-particle-size single crystal morphology, and the problem that particles are easy to agglomerate in a conventional method is effectively solved. The material prepared by the method has good crystallinity and excellent electrochemical performance. The micron-sized ternary positive electrode material with a good form can be prepared by one-step sintering at a relatively low sintering temperature, meanwhile, bulk phase doping is realized, a crystal structure is stabilized, and the structure and interface stability of the single-crystal ternary positive electrode material is improved. The whole production process is short in time consumption, simple in procedure and easy to industrially popularize.

Description

technical field [0001] The invention relates to the technical field of synthesizing positive electrode active materials for secondary batteries, in particular to a method for preparing a large-diameter single crystal ternary positive electrode material at a low temperature in one step. Background technique [0002] In recent years, the safety of power batteries has been significantly improved, and high-nickel ternary cathode materials with significant advantages in energy density have become a research hotspot for power battery companies. Ternary cathode materials are developing in the direction of ultra-high nickel and low cobalt. [0003] With the increase of nickel content, the structural instability and surface reconstruction of high-nickel ternary cathode materials accelerate the failure of the battery. For example, the most common form of ternary cathode materials is the secondary particle morphology. During the cycle, due to the accumulation of lattice stress distorti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525
CPCH01M4/525
Inventor 颜果春徐正伟王接喜王志兴郭华军彭文杰胡启阳李新海
Owner CENT SOUTH UNIV
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