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Preparation method of surface titanium nitride deposited high-nickel ternary positive pole piece of lithium battery

A cathode electrode and surface deposition technology, applied in the field of high nickel ternary cathode electrode preparation, can solve the problems of battery electrochemical performance degradation, battery capacity, cycle performance degradation, thermal stability and safety performance degradation, etc. Simple steps, enhanced fast moving ability, easy industrialized production effect

Inactive Publication Date: 2019-06-14
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface phase transition of the high-nickel ternary positive electrode during charging and discharging is likely to cause the attenuation of battery capacity and cycle performance. At the same time, the fragmentation of high-nickel ternary positive electrode material particles during the cycle will also cause the electrochemical performance of the battery to decay, resulting in thermal stability. and safety degradation

Method used

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  • Preparation method of surface titanium nitride deposited high-nickel ternary positive pole piece of lithium battery
  • Preparation method of surface titanium nitride deposited high-nickel ternary positive pole piece of lithium battery
  • Preparation method of surface titanium nitride deposited high-nickel ternary positive pole piece of lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1. LiNi deposited on the surface of titanium nitride 0.8 co 0.1 mn 0.1 o 2 Positive electrode production

[0054] Weigh 2123.28 grams of LiNi according to the mass ratio of 98.3:0.5:1.2 0.8 co 0.1 mn 0.1 o 2 Powder, 216 grams of carbon nanotube slurry, 25.92 grams of polyvinylidene fluoride powder. Will LiNi 0.8 co 0.1 mn 0.1 o 2 The material powder was placed in a vacuum oven and baked under high vacuum for 6 hours at a temperature of 120°C. The polyvinylidene fluoride was placed in a vacuum oven and baked under high vacuum for 10 hours at a temperature of 100°C.

[0055] Weigh 634.8 grams of N-methylpyrrolidone solvent and place it in a vacuum stirring tank, add polyvinylidene fluoride powder, and stir together for 1.5 hours with a stirring speed of 30 rpm and a dispersion speed of 1200 rpm, and then add the carbon nanotube slurry , Stir together for 2 hours with a stirring speed of 30 rev / min and a dispersing speed of 1200 rev / min. Add LiNi at the end ...

Embodiment 2

[0067] 1. LiNi deposited on the surface of titanium nitride 0.5 co 0.2 mn 0.3 o 2 Positive electrode production

[0068] Weigh 2123.28 grams of LiNi according to the mass ratio of 98.3:0.5:1.2 0.5 co 0.2 mn 0.3 o 2 Powder, 216 grams of carbon nanotube slurry, 25.92 grams of polyvinylidene fluoride powder. Will LiNi 0.5 co 0.2 mn 0.3 o 2 The material powder was placed in a vacuum oven and baked under high vacuum for 6 hours at a temperature of 120°C. The polyvinylidene fluoride was placed in a vacuum oven and baked under high vacuum for 8 hours at a temperature of 100°C.

[0069] Weigh 634.8 grams of N-methylpyrrolidone solvent and place it in a vacuum stirring tank, add polyvinylidene fluoride powder, and stir together for 2 hours with a stirring speed of 35 rpm and a dispersion speed of 800 rpm, and then add the carbon nanotube slurry , Stir together for 2 hours with a stirring speed of 30 rev / min and a dispersing speed of 1200 rev / min. Add LiNi at the end 0.5 ...

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Abstract

The invention relates to a preparation method of a surface titanium nitride deposited high-nickel ternary positive pole piece of a lithium battery. The specific method comprises the following steps of: weighing high-nickel ternary positive pole powder, carbon nanotube size and polyvinylidene fluoride powder according to a mass ratio, weighing N-methyl pyrrolidone of which mass is (15 to 30) timesof mass of the polyvinylidene fluoride powder, preparing high-nickel ternary positive pole size, and coating the sieved high-nickel ternary positive pole size on the upper and lower surfaces of an aluminium foil by using a transfer type coating machine to obtain the high-nickel ternary positive pole piece; preparing titanium nitride suspension from titanium nitride nano powder; and spraying the titanium nitride suspension to the surface of the high-nickel ternary positive pole piece by an ultrasonic atomization preparation system to obtain the high-nickel ternary positive pole piece of which the pole piece surface is deposited with titanium nitride. According to the invention, by depositing titanium nitride nano particles on the surface of the high-nickel ternary positive pole piece, a high-electrical-conductivity and high-thermal-conductivity network is formed inside an electrode, and large-current charge-discharge performance and thermal safety of the battery are obviously improved.

Description

technical field [0001] The invention relates to a method for preparing a high-nickel ternary positive pole piece deposited with titanium nitride on the surface of a lithium battery, and belongs to the technical field of lithium ion battery production. technical background [0002] As an effective chemical energy-electrical energy conversion energy storage device, secondary batteries have been widely used in people's daily life. Lithium-ion batteries have the advantages of high working voltage, high energy density, high coulombic efficiency of charge and discharge, low self-discharge rate, no memory effect, long cycle life and environmental friendliness. They are used in portable energy storage devices, new energy vehicles and aviation Aerospace and other fields have broad application prospects. The positive electrode active material is one of the core components of lithium-ion batteries and an important factor determining the overall performance of lithium-ion batteries. L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/36H01M4/62H01M4/505H01M4/525H01M10/0525H01M10/0585H01M10/613H01M10/625H01M10/653H01M10/654B82Y30/00
CPCY02E60/10Y02P70/50
Inventor 洪礼训池毓彬林应斌黄志高
Owner FUJIAN NORMAL UNIV