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A kind of preparation method of positive electrode conductive agent and conductive agent slurry of lithium ion battery

A lithium-ion battery and conductive agent technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of high energy consumption, complex preparation process, etc., and achieve a large contact area, simple preparation process, and high productivity short cycle effect

Active Publication Date: 2020-12-01
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process is complex and energy-intensive, and contains strong acids and strong oxidants

Method used

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  • A kind of preparation method of positive electrode conductive agent and conductive agent slurry of lithium ion battery
  • A kind of preparation method of positive electrode conductive agent and conductive agent slurry of lithium ion battery
  • A kind of preparation method of positive electrode conductive agent and conductive agent slurry of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Mix 50g of raw Ketjen black with 2500g of ultrapure water, feed high-purity oxygen while stirring, and control the flow rate of oxygen feed to 0.5m 3 / h, oxygen time is 3h;

[0035] (2) Put the Ketjen Black after the oxygen treatment into a sand mill for sanding, the sanding medium is zirconia balls, the speed of the sanding is 1800 rpm, and the sanding time is 4 hours, to obtain the Ketjen black pulp material;

[0036] (3) drying the ketjen black slurry obtained in step (2) at a temperature of 80° C. for 12 hours to obtain a ketjen black coarse material;

[0037] (4) Pass through a 200-mesh sieve, and collect the sieved material to obtain an oxidation-modified Ketjen Black conductive agent.

[0038] (5) 30g of binder polytetrafluoroethylene PVDF, 30g of oxidation-modified Ketjen black conductive agent, 940g of active material lithium manganese oxide LMO, nickel-cobalt-manganese ternary material NCM, lithium iron phosphate LFP and lithium nickel manganese oxide LN...

Embodiment 2

[0040] (1) Mix 30g of raw material Ketjen black with 1000g of ultrapure water, feed high-purity oxygen while stirring, and control the flow rate of oxygen feed to 0.2m 3 / h, oxygen time is 5h;

[0041] (2) Put the Ketjen black after the oxygen treatment into a sand mill for sand grinding, the sand grinding medium adopts zirconia balls, the speed of the sand mill is 1000 rpm, and the sand mill time is 5h to obtain Ketjen black pulp material;

[0042] (3) drying the ketjen black slurry obtained in step (2) at a temperature of 50°C for 12 hours to obtain a ketjen black coarse material;

[0043] (4) Pass through a 100-mesh sieve, and collect the sieved material to obtain an oxidation-modified Ketjen Black conductive agent.

[0044] (5) 10g of binder polytetrafluoroethylene PVDF, 20g of oxidation-modified Ketjen black conductive agent, 970g of active material lithium manganese oxide LMO, nickel-cobalt-manganese ternary material NCM, lithium iron phosphate LFP and lithium nickel m...

Embodiment 3

[0046] (1) Mix 50g of raw Ketjen black with 2000g of ultrapure water, feed high-purity oxygen while stirring, and control the flow rate of oxygen feed to 0.8m 3 / h, oxygen time is 2h;

[0047] (2) Put the Ketjen Black after the oxygen treatment into a sand mill for sanding, the sanding medium is zirconia balls, the speed of the sanding is 2500 rpm, and the sanding time is 2 hours to obtain the Ketjen black pulp material;

[0048](3) drying the ketjen black slurry obtained in step (2) at a temperature of 100° C. for 6 hours to obtain a ketjen black coarse material;

[0049] (4) Pass through a 300-mesh sieve, and collect the sieved material to obtain an oxidation-modified Ketjen Black conductive agent.

[0050] (5) 50g of binder polytetrafluoroethylene PVDF, 50g of oxidation-modified Ketjen black conductive agent, 900g of active material lithium manganese oxide LMO, nickel-cobalt-manganese ternary material NCM, lithium iron phosphate LFP and lithium nickel manganese oxide LNMO...

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Abstract

The invention provides a preparation method of a positive electrode conductive agent and conductive agent slurry of a lithium ion battery. The preparation method comprises the following steps of mixing the raw material Ketjen black with water according to a mass ratio of (1-3):(50-100) and introducing oxygen during stirring; placing the Ketchen black after oxygen introduction treatment in a sand mill for sanding to obtain Ketjen black slurry; drying the Ketchen black slurry to obtain a Ketchen black crude material; conducting sieving and collecting a sieved material to obtain the oxidized andmodified Ketchen black conductive agent. According to the preparation method, high-purity oxygen is adopted for modifying the Ketjen black so that functional groups on the surface of the Ketjen blackcan achieve a good self-assembly effect with active materials, the conductive agent has more contact sites with the active materials, a good conductive network is formed, and the electrical performance of electric sheets can be improved.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium ion battery positive electrode conductive agent, in particular to a preparation method of lithium ion battery positive electrode conductive agent containing Ketjen black and conductive agent slurry. 【Background technique】 [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, no memory effect, and environmental friendliness; therefore, they are widely used in industries such as smartphones, notebook computers, and electric vehicles. [0003] Lithium-ion batteries are mainly composed of positive electrodes, separators, negative electrodes, electrolytes, etc., and the dispersion state and uniformity of conductive additives and positive active materials in positive electrodes greatly affect the performance of lithium-ion batteries. For example, it will affect the rate performance and cycle performance of the battery. The traditional conductive agent uses a modi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/56C09C3/04C09C3/06C09C3/10H01M4/62H01M10/0525
CPCY02E60/10
Inventor 李庆余韩金路赖飞燕吴强黄有国王红强
Owner GUANGXI NORMAL UNIV
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