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A kind of single crystal high-nickel ternary positive electrode material and preparation method thereof

A positive electrode material and high-nickel technology, which is applied in the field of single crystal high-nickel ternary positive electrode materials and its preparation, can solve the problems of high discharge capacity decay rate, low thermal runaway temperature, and low charge and discharge capacity, and achieve discharge capacity decay The effect of small rate, high thermal runaway temperature, and high charge and discharge capacity

Active Publication Date: 2022-02-01
SHANGHAI ZIJIAN CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the low charge and discharge capacity, large discharge capacity decay rate, low gram capacity, poor cycle stability, poor rate performance, and low thermal runaway temperature of the high-nickel ternary positive electrode material in the prior art. , low first effect, and large heat release defects, a single crystal high-nickel ternary positive electrode material and its preparation method are provided

Method used

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  • A kind of single crystal high-nickel ternary positive electrode material and preparation method thereof
  • A kind of single crystal high-nickel ternary positive electrode material and preparation method thereof
  • A kind of single crystal high-nickel ternary positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0052] The precursor Ni purchased from the market 0.6 co 0.2 mn 0.2 (OH) 2 (purchased from Jiangsu Haian Zhichuan New Material Company, 9.2g, 0.1mol), LiOH (purchased from Acros, 2.874g, 0.12mol), Na 2 SO 4 (purchased from Greagent, 7.102g, 0.05mol) mixed evenly, put into a corundum crucible, heated to 950°C at a heating rate of 10°C / min, kept for 15 hours, and naturally cooled to room temperature (approximately 25°C-35°C °C), the resulting mixture was washed three times with deionized water, dried in vacuum at 120 °C for 3 hours, then heated to 750 °C at a heating rate of 10 °C / min, kept for 6 hours, and naturally cooled to room temperature to obtain product 1 , that is, single crystal 622 ternary material.

[0053] Electrochemical test: the single crystal 622 ternary material obtained above was mixed with conductive carbon and PVDF (polyvinylidene fluoride) binder in a ratio of 90:5:5 (mass ratio) in NMP (N-methylpyrrolidone ) and coated on an aluminum foil to obtain a...

Embodiment 2

[0056] Precursor Ni from the market 0.8 co 0.1 mn 0.1 (OH) 2(9.236g, 0.1mol), LiOH (3.114g, 0.13mol), CsCl (8.418g, 0.05mol) (manufacturer of source of material is the same as Example 1) mix uniformly, put into corundum crucible, with 10 ℃ / min heating rate, heated to 780°C, kept for 15 hours, naturally cooled to room temperature, the mixture was washed three times with deionized water, dried in vacuum at 120°C for 3 hours, then put into a crucible, heated to 750°C at a heating rate of 10°C / min ℃, kept for 6 hours, and naturally cooled to room temperature to obtain product 2, which is the single crystal 811 ternary material. The electrochemical test method is the same as in Example 1.

[0057] Figure 8 It is a scanning electron micrograph of product 2 (single crystal 811 ternary material). Figure 9 It is the first electrochemical charge and discharge curve of product 2 (single crystal 811 ternary material). The figure shows that the discharge capacity of product 2 in t...

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Abstract

The invention discloses a single-crystal high-nickel ternary positive electrode material and a preparation method thereof. The method is to calcine the nickel-cobalt-manganese hydroxide precursor in a mixed molten salt at high temperature; the chemical formula of the nickel-cobalt-manganese hydroxide precursor is Ni x co y mn z (OH) 2 , where 0.6≤x≤1, 0≤y≤0.4, 0≤z≤0.4, and x+y+z=1; the mixed molten salt includes Li compound and inorganic salt; the molar ratio of inorganic salt to Li compound is less than 3 : 7, the molar ratio of the Li compound to the nickel-cobalt-manganese hydroxide precursor is greater than 1.15. The preparation method of the invention is simple and low in cost, and is compatible with current ternary material synthesis equipment and conditions. The obtained monocrystalline high-nickel ternary cathode material has good crystallinity, higher charge and discharge capacity, smaller discharge capacity decay rate, higher gram capacity, excellent cycle performance, better rate performance, higher thermal runaway temperature, and first effect Higher, less heat release, safer.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a single-crystal high-nickel ternary positive electrode material and a preparation method thereof. Background technique [0002] With the rapid development of the new energy vehicle industry, the production and sales of power batteries as the core energy supply device of new energy vehicles have been increasing year by year (more than 200GWh, in 2017), and the ever-expanding digital equipment (such as virtual reality equipment VR, drones, Household robots, etc.) also put forward higher and higher requirements for the performance and safety of future power batteries. The positive electrode material of the battery is the core part of the power battery, which directly determines the energy density, power density, safety index and cost of the battery. Layered structure nickel-rich ternary cathode material (LiNi x co y mn 1-x-y o 2 , x≥0.6, referred to as NMC; LiNi 0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/52H01M10/0525
CPCY02E60/10
Inventor 李林森钱冠男王红马紫峰
Owner SHANGHAI ZIJIAN CHEM TECH CO LTD
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