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Negative electrode material for power lithium-ion battery with core-shell structure and preparation method thereof

A lithium-ion battery, core-shell structure technology, applied in the direction of battery electrodes, secondary batteries, structural parts, etc., can solve the problems of graphite structure damage, poor rate charge and discharge performance, etc., to achieve strong adaptability, high lithium insertion capacity, The effect of excellent low temperature discharge performance and room temperature cycle stability and rate discharge performance

Inactive Publication Date: 2016-09-28
XINXIANG SAIRI NEW ENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a core-shell structure power lithium ion battery negative electrode material and its preparation method, which enhances the compatibility of the graphite negative electrode material to the electrolyte solution and solves the problem of lithium ion battery Poor rate charge and discharge performance in low temperature environment and the problem that the graphite structure is easily damaged during the charge and discharge process

Method used

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  • Negative electrode material for power lithium-ion battery with core-shell structure and preparation method thereof
  • Negative electrode material for power lithium-ion battery with core-shell structure and preparation method thereof
  • Negative electrode material for power lithium-ion battery with core-shell structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Mix the raw material phenolic resin and coal tar pitch at a mass ratio of 3:7, then coarsely pulverize them, and then carry out two jet mills so that the D10 of the mixture of phenolic resin and petroleum pitch is ≤1.8 μm, and the D50 is 2.0~ 3.5μm, D90≤5.0μm, D100≤10.0μm;

[0025] (2) Put 10.0kg of isotropic graphite and 1.111kg of the above-mentioned resin and asphalt mixture in a conical mixer for solid-phase coating according to the mass ratio of 90:10, and the coating time is 1.5 hours;

[0026] (3) Put the above-mentioned mixed and coated materials in a graphite crucible, in a nitrogen atmosphere in a push plate tunnel kiln, the gas flow rate is 3m 3 Under the condition of 1000°C carbonization for 3 hours, cooled to 60°C and released from the furnace, crushed and sieved through a 300-mesh sieve, the primary coated core-shell structure negative electrode material was obtained.

Embodiment 2

[0028] (1) Mix the raw material furan resin and petroleum asphalt according to the mass ratio of 6:4, then carry out coarse crushing, and then carry out two jet crushing so that the D10 of the resin and asphalt mixture is ≤1.8 μm, and the D50 is 2.0~3.5 μm, D90≤5.0μm, D100≤10.0μm;

[0029] (2) Put 10.0kg of isotropic graphite and 1.111kg of the above-mentioned resin and asphalt mixture in a conical mixer for solid-phase coating according to a mass ratio of 90:10, and the coating time is 2.0 hours;

[0030] (3) Put the above-mentioned mixed and coated materials in a graphite crucible, in a nitrogen atmosphere in a push plate tunnel kiln, the gas flow rate is 3m 3 Under the condition of 1100°C carbonization for 4 hours, cooled to 60°C and released from the furnace, crushed and sieved through a 300-mesh sieve, the anode material with a core-shell structure can be obtained once;

[0031] (4) Put 5.0kg of the product obtained in the above step (3) and 0.435kg of petroleum pitch in...

Embodiment 3

[0033] (1) Mix the raw material phenolic resin and petroleum asphalt at a mass ratio of 3.3:6.7 and then carry out coarse crushing, and then carry out two airflow crushing so that the D10 of the resin / asphalt mixture is ≤1.8 μm, and the D50 is 2.0~3.5 μm. D90≤5.0μm, D100≤10.0μm;

[0034] (2) Put 10.0kg of isotropic graphite and 1.364kg of the above-mentioned resin and asphalt mixture in a conical mixer for solid-phase coating according to the mass ratio of 88:12, and the coating time is 2.5 hours;

[0035] (3) Put the above-mentioned mixed and coated materials in a graphite crucible, in the argon atmosphere in the push plate tunnel kiln, the gas flow rate is 5m 3 Under the condition of 1200°C carbonization for 6 hours, the temperature was lowered to 60°C and released from the furnace. After being crushed and sieved through a 300-mesh sieve, the primary coated core-shell structure negative electrode material was obtained.

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Abstract

The invention relates to a power lithium-ion battery negative electrode material with a core-shell structure of an electric automobile and a preparation method thereof. The power lithium-ion battery negative electrode material comprises a graphite core and a shell, wherein the shell has a single-layer structure or a double-layer structure and is formed by one cladding or two cladding through a solid-phase cladding method; the shell with the single-layer structure is a hard-carbon and soft-carbon mixed carbide layer; the shell with the double-layer structure consists of an inner layer and an outer layer, the inner layer is a hard-carbon and soft-carbon mixed carbide layer, and the outer layer is a pure soft carbon carbide layer. The shell is prepared by the following steps: uniformly mixing and cladding the crushed hard-carbon and soft-carbon mixed coatings and isotropic graphite in a conical mixer, performing carbonization in an inert atmosphere, cooling, crushing and screening to obtain the shell formed by one cladding or a shell formed by two cladding. The compatibility of the graphite negative electrode material on an electrolyte solution is enhanced, and the problems that a lithium ion battery is poor in rate charge and discharge performance in high / low-temperature environments and a graphite structure is easily damaged in a charge and discharge process are solved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a power lithium-ion battery negative electrode material with a core-shell structure for electric vehicles and a preparation method thereof. Background technique [0002] In recent years, the state has successively issued a series of subsidy policies to promote the smooth progress of the promotion and application of new energy vehicles. As the main power source of new energy vehicles, the rapid development of lithium-ion batteries has also become the focus of attention. The application of lithium-ion batteries in new energy vehicles has put forward higher requirements for itself, that is, higher specific energy density, better high and low temperature rate discharge performance, and longer cycle life. At present, the anode materials of lithium-ion batteries commercially used are mainly graphite materials, which have the advantages of low lithium intercala...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCH01M4/133H01M4/1393H01M4/366H01M4/587H01M10/0525Y02E60/10
Inventor 邹武刘玉军张文静
Owner XINXIANG SAIRI NEW ENERGY SCI & TECH
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