Preparation method of carbon-coated single crystal ternary cathode material

A carbon-coated single crystal and positive electrode material technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of incomplete coating, can not prevent the erosion of electrolyte to materials, etc., achieve low residual rate and improve cycle stability The effect of improving the magnification performance

Inactive Publication Date: 2018-12-07
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The organic carbon source used in step S2 of this invention - sucrose, glucose, starch, etc., can form a network carbon layer after carbonization. Although the addition of conductive carbon further enriches the conductive network and increases the conductivity of the material, the carbonization of the organic carbon source The main carbon layer is still in the form of a network, and the coating is incomplete, which cannot prevent the electrolyte from eroding the material

Method used

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  • Preparation method of carbon-coated single crystal ternary cathode material
  • Preparation method of carbon-coated single crystal ternary cathode material
  • Preparation method of carbon-coated single crystal ternary cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh Ni respectively at a molar ratio of 1:1.05 0.5 co 0.2 m 0.3 (OH) 2 with Li 2 CO 3 , the single crystal larger ternary cathode material precursor Ni 0.5 co 0.2 m 0.3 (OH) 2 , sintered at 600°C for 6 hours in an oxygen atmosphere to obtain precursor oxides; the precursor oxides were dissociated into primary particles by a jet mill, the frequency of the classifier was 60Hz, and the air pressure was 10Mp; Dissociation products and Li 2 CO 3 Mix lithium for 0.5h, then sinter the mixture at 550°C for 6h in an oxygen atmosphere, crush it and sinter at 1050°C for 16h in an air atmosphere, cool, dissociate, and sieve to obtain a single crystal Li 1 Ni 0.5 co 0.2 mn 0.3 o 2 Positive electrode material matrix.

[0037] Ethyl cellulose and triethyl citrate were dissolved in ethanol at a ratio of 20:1 to prepare a 1% ethyl cellulose solution, and the single crystal Li 1 Ni 0.5 co 0.2 mn 0.3 o 2 The positive electrode material matrix was added to 5L of ethyl...

Embodiment 2

[0040] Weigh Ni respectively at a molar ratio of 1:1.02 0.6 co 0.2 m 0.2 (OH) 2 with LiOH·H 2 O, the single crystal larger ternary cathode material precursor Ni 0.6 co 0.2 m 0.2 (OH) 2 , sintered at 500°C for 4 hours in an oxygen atmosphere to obtain precursor oxides; the precursor oxides were dissociated into primary particles using a jet mill, the frequency of the classifier was 50Hz, and the air pressure was 12Mp; with LiOH·H 2 O mixed with lithium for 1.0h, the mixture was sintered at 450°C for 8h in an oxygen atmosphere, crushed and sintered for a second time at 1000°C in an oxygen atmosphere for 12h, cooled, dissociated, and sieved to obtain single crystal Li 1 Ni 0.8 co 0.1 mn 0.1 o 2 Positive electrode material matrix.

[0041] Dissolve hydroxyethyl cellulose and tributyl lemon in water at a mass ratio of 15:1 to prepare a 0.5% hydroxyethyl cellulose solution. single crystal Li 1 Ni 0.6 co 0.2 mn 0.2 o 2 The positive electrode material matrix was add...

Embodiment 3

[0044] Weigh Ni respectively at a molar ratio of 1:1.05 0.8 co 0.1 mn 0.1 (OH) 2 with LiOH·H 2 O, the single crystal larger ternary cathode material precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 , sintered at 500°C for 5 hours in an oxygen atmosphere to obtain precursor oxides; the precursor oxides were dissociated into primary particles using a jet mill, the frequency of the classifier was 50Hz, and the air pressure was 6Mp; with LiOH·H 2 O mixed with lithium for 1h, the mixture was sintered at 480°C for 6h in an oxygen atmosphere, crushed and then sintered at 900°C for 12h in an oxygen atmosphere, cooled, dissociated, and sieved to obtain single crystal Li 1 Ni 0.8 co 0.1 mn 0.1 o 2 Positive electrode material matrix.

[0045] Dissolve hydroxypropyl methylcellulose and dibutyl sebacate in water at a mass ratio of 30:1 to prepare a 2.5% hydroxypropyl methylcellulose solution. single crystal Li 1 Ni 0.8 co 0.1 mn 0.1 o 2 The positive electrode material matrix was ad...

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Abstract

The invention discloses a preparation method of a carbon-coated single crystal ternary cathode material. The method includes: (S1) sintering a single crystal ternary cathode material precursor in oxygen atmosphere to prepare a precursor oxide; (S2) crushing the precursor oxide into primary granules; (S3) performing first sintering and secondary sintering to the dissociated precursor oxide and a lithium source to obtain a single crystal ternary cathode material substrate; (S4) preparing a mixed solution from the organic carbon source and a plasticizer, and adding the single crystal ternary cathode material substrate to the mixed solution, performing spray drying and collecting the product, organic-coated single crystal ternary cathode material; (S5) sintering the organic-coated single crystal ternary cathode material in an inert gas atmosphere, and crushing the product to obtain the carbon-coated single crystal ternary cathode material LixNi<1-y-z>CoyMnzO2 / C, 1 <= x <= 1.1, 0 < y <= 1 / 3and 0 < z <= 1 / 3. The single crystal ternary cathode material is coated with the carbon completely and uniformly, so that electronic conductivity and cyclic performance of the single crystal ternarycathode material are enhanced.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials for lithium ion batteries, and in particular relates to a method for preparing carbon-coated single crystal ternary positive electrode materials. Background technique [0002] Since Sony Corporation of Japan successfully commercialized lithium-ion batteries in 1991, after more than 20 years of development, lithium-ion batteries have been widely used due to their advantages such as high energy density, good cycle performance, high open circuit voltage, no memory effect and environmental friendliness. used in every aspect of our lives. In recent years, along with my country's new energy strategy, the demand for lithium batteries in the power battery and energy storage system market has continued to increase. In 2016, my country's power battery shipments were 28.04Gwh, a year-on-year increase of 78.6%. Among them, new energy passenger car and bus batteries shipped...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62
CPCH01M4/364H01M4/505H01M4/525H01M4/625Y02E60/10
Inventor 赵德罗桂唐泽勋商士波陈敏
Owner 桑顿新能源科技(长沙)有限公司
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