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Ternary positive electrode material coated with metal phthalocyanine compound and preparation method thereof

A technology of metal phthalocyanine and positive electrode material, which is applied in the field of metal phthalocyanine compound-coated ternary positive electrode material and its preparation field, can solve the problems of poor electrochemical cycle performance, unstable ternary material structure, etc., and achieve good catalytic effect , the effect of improving cycle stability and high electronic conductivity

Active Publication Date: 2021-08-31
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at problems such as unstable structure of ternary materials and poor electrochemical cycle performance, the purpose of the present invention is to provide a ternary positive electrode material coated with a metal phthalocyanine compound and a preparation method thereof, without reducing the initial charge and discharge capacity of the material. Effectively improve the electrochemical cycle stability of ternary cathode materials

Method used

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  • Ternary positive electrode material coated with metal phthalocyanine compound and preparation method thereof
  • Ternary positive electrode material coated with metal phthalocyanine compound and preparation method thereof
  • Ternary positive electrode material coated with metal phthalocyanine compound and preparation method thereof

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preparation example Construction

[0030] Its preparation method comprises the following steps:

[0031] Step 1. Preparation of raw materials. Mix the lithium source with nickel-cobalt-manganese hydroxide or nickel-cobalt-aluminum hydroxide precursors evenly, and place them in high-temperature equipment for calcination under an oxygen atmosphere to obtain a matrix of high-nickel-nickel-cobalt lithium manganate or nickel Lithium cobalt aluminate material;

[0032] Step 2, material modification, uniformly mixing the metal phthalocyanine compound with the matrix obtained in step 1, placing it in high-temperature equipment and calcining under an oxygen atmosphere to obtain a ternary positive electrode material coated with a metal phthalocyanine compound.

[0033] In step 1, the lithium source is one or both of lithium hydroxide and lithium carbonate.

[0034] In step 1, the nickel element content in the nickel-cobalt-manganese hydroxide or nickel-cobalt-aluminum hydroxide precursor is 80%-96% of its total molar am...

Embodiment 1

[0040] Step 1. Mix lithium hydroxide and nickel-cobalt-manganese hydroxide precursor evenly, wherein the molar ratio of the three metal elements of nickel-cobalt-manganese in nickel-cobalt-manganese oxide lithium is 80:10:10, lithium and nickel-cobalt-manganese hydroxide The molar ratio of the mixture is 1:1, and the mixture is placed in a high-temperature equipment and calcined under an oxygen atmosphere. The first-stage calcining temperature is 550°C, the holding time is 6h, and the heating rate is 2°C / min. The second-stage calcining temperature is 700°C. The time is 16 hours, the heating rate is 2°C / min, and the nickel-cobalt-lithium manganese oxide matrix material is obtained;

[0041] Step 2, mix the mononuclear cobalt phthalocyanine (CoPc) and the matrix material evenly, the consumption of the mononuclear cobalt phthalocyanine is 1% of the matrix dosage, place it in high-temperature equipment and calcinate under oxygen atmosphere, the calcining temperature is 400 DEG C, o...

Embodiment 2

[0046] Step 1. Mix lithium carbonate and nickel-cobalt-aluminum hydroxide precursor evenly, wherein the molar ratio of the three metal elements of nickel-cobalt-aluminum in nickel-cobalt-aluminate lithium is 83:15:2, lithium and nickel-cobalt-aluminum hydroxide The molar ratio of the mixture is 1.15:1. The mixture is placed in a high-temperature equipment and calcined under an oxygen atmosphere. The first-stage calcining temperature is 500°C, the holding time is 6h, the heating rate is 2°C / min, the second-stage calcining temperature is 800°C, and the holding time 16h, the heating rate is 2°C / min, and the nickel-cobalt lithium manganese oxide matrix material is obtained;

[0047] Step 2, mix the binuclear nickel phthalocyanine (Ni2Pc2) with the base material evenly, the amount of binuclear nickel phthalocyanine is 0.05% of the amount of the base, place it in a high-temperature equipment and calcinate under an oxygen atmosphere, and the calcining temperature is 600 ° C to obtain ...

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Abstract

The invention discloses a ternary positive electrode material coated with a metal phthalocyanine compound and a preparation method thereof, which uses high-nickel nickel-cobalt lithium manganate or nickel-cobalt lithium aluminate material as a substrate, and the substrate is coated with metal phthalocyanine compound. Mix the lithium source with nickel-cobalt-manganese hydroxide or nickel-cobalt-aluminum hydroxide precursors evenly, place them in high-temperature equipment and calcine them under an oxygen atmosphere to obtain a matrix of high-nickel-nickel-cobalt lithium manganate or nickel-cobalt lithium aluminate material ; Mix the metal phthalocyanine compound and the matrix material evenly, place it in a high-temperature equipment and calcinate it under an oxygen atmosphere to obtain a modified ternary positive electrode material. Metal phthalocyanine compounds have high electronic conductivity, heat resistance and acid resistance, and high-efficiency catalysis, which is very beneficial to improving the charge-discharge capacity and cycle stability of high-nickel ternary cathode materials.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and relates to a ternary positive electrode material coated with a metal phthalocyanine compound and a preparation method thereof. Background technique [0002] As a new generation of green high-energy batteries, lithium-ion batteries are widely used in various 3C products and new energy vehicles and have broad market prospects. The current research hotspots mainly focus on further improving the power density, energy density and safety performance of materials. Judging from the positive electrodes currently used in lithium-ion batteries, transition metal oxide positive electrodes are obviously more advantageous than polyanion positive electrodes such as lithium iron phosphate in terms of improving battery specific energy, while nickel-cobalt-manganese, nickel-cobalt-aluminum, etc. are the main applications. Cathode material. As we all know, the hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/62H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 王继锋王夏阳寇亮张超张诚田占元邵乐
Owner SHAANXI COAL & CHEM TECH INST
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