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A kind of lithium-ion battery negative electrode material and preparation method thereof, lithium-ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as unimproved charge and discharge rates, poor rate performance, and reduced safety performance, so as to improve rate performance and Fast charge and discharge rate, excellent performance, and the effect of improving conductivity

Active Publication Date: 2019-10-11
JIAOZUO JUNENG ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned methods can reduce the lithium ion on the surface of the negative electrode material during the charging and discharging process of the lithium-ion battery during the high-rate charge and discharge (that is, when the lithium ion is ready to be embedded in the negative electrode, the space for accommodating lithium ions is not enough to accumulate on the surface of the negative electrode to form lithium. D

Method used

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  • A kind of lithium-ion battery negative electrode material and preparation method thereof, lithium-ion battery
  • A kind of lithium-ion battery negative electrode material and preparation method thereof, lithium-ion battery
  • A kind of lithium-ion battery negative electrode material and preparation method thereof, lithium-ion battery

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Effect test

Embodiment 1

[0028] The lithium-ion battery negative electrode material in this embodiment presents a core-shell structure, the inner core is graphite, and the outer shell is a double-layer structure. From the inside to the outside, there are lithium zirconate layer and organic lithium composite layer, the core: lithium zirconate layer: organic lithium composite layer The thickness ratio of the layers is 100:5:1.

[0029] The concrete preparation method of this lithium-ion battery negative electrode material is:

[0030] 1) Configuration of inorganic lithium composite liquid and organic lithium composite liquid

[0031] a. Configuration of inorganic lithium composite solution: Weigh 100g of lithium zirconate, 1.5g of organic dispersant polyvinyl alcohol, 3g of binder polyvinylidene fluoride, and 1.5g of graphene and add them to 800g of N-methylpyrrolidone, and disperse evenly at high speed instant;

[0032] b. Configuration of organic lithium composite liquid: Weigh 100g methyllithium, 1...

Embodiment 2

[0038]The lithium-ion battery negative electrode material in this embodiment presents a core-shell structure, the inner core is graphite, and the outer shell is a double-layer structure. From the inside to the outside, there are lithium zirconate layer and organic lithium composite layer, the core: lithium zirconate layer: organic lithium composite layer The layer thickness ratio is 100:7:3.

[0039] The concrete preparation method of this lithium-ion battery negative electrode material is:

[0040] 1) Configuration of inorganic lithium composite liquid and organic lithium composite liquid

[0041] a. Configuration of inorganic lithium composite solution: Weigh 100g of lithium zirconate, 1g of organic dispersant polyvinyl alcohol, 2g of binder polyvinylidene fluoride, and 1g of graphene, add them to 500g of N-methylpyrrolidone, and disperse evenly at high speed. ;

[0042] b. Configuration of organic lithium composite solution: Weigh 100g butyllithium, 0.5g dispersant sec-oc...

Embodiment 3

[0048] The lithium-ion battery negative electrode material in this embodiment presents a core-shell structure, the inner core is graphite, and the outer shell is a double-layer structure. From the inside to the outside, there are lithium zirconate layer and organic lithium composite layer, the core: lithium zirconate layer: organic lithium composite layer The layer thickness ratio was 20:2:1.

[0049] The concrete preparation method of this lithium-ion battery negative electrode material is:

[0050] 1) Configuration of inorganic lithium composite liquid and organic lithium composite liquid

[0051] a. Configuration of inorganic lithium composite solution: Weigh 100g of lithium zirconate, 2g of organic dispersant polyvinyl alcohol, 4g of binder polyvinylidene fluoride, and 2g of graphene, add them to 1000g of N-methylpyrrolidone, and disperse evenly at high speed. ;

[0052] b. Configuration of organic lithium composite liquid: Weigh 100g butyllithium, 0.75g dispersant sec-o...

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Abstract

The invention provides a lithium ion battery cathode material and a preparation method thereof and a lithium ion battery. The cathode material is of a core-shell structure, the core is graphite, and the shell is of a two-layer structure which sequentially comprises an inorganic lithium layer and an organic lithium composite layer from inside to outside. The preparation process of the cathode material comprises the steps that 1, the graphite and an inorganic lithium composite liquid are mixed to be uniform, after the pH value is regulated, heating is conducted to remove an organic dispersing agent and solvent, and grinding is conducted to obtain a solid product A, wherein the inorganic lithium composite liquid is prepared from inorganic lithium, the organic dispersing agent, an adhesive, graphene and the solvent; 2, the solid product A and organic lithium composite liquid are mixed to be uniform, drying and carbonizing are conducted sequentially, a product is cooled to room temperature, and then the cathode material is obtained, wherein the organic lithium composite liquid is prepared from organic lithium, a dispersing agent, an adhesive, carbon nanotubes and solvent. According to the cathode material, the transmission rate of lithium ions is effectively increased, the electron conductivity of the lithium ions is effectively improved, quick charging and discharging are well achieved, and finally the rate performance, safety performance and cycle performance of the battery are improved.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, a preparation method thereof and a lithium ion battery, belonging to the technical field of lithium ion battery negative electrode materials. Background technique [0002] Lithium-ion battery is the most promising rechargeable secondary chemical power source recognized so far. It has much higher energy density than nickel-cadmium secondary battery and lead-acid battery, and has a smaller volume ratio. Energy, the battery does not contain elements that seriously pollute the environment. It is one of the most researched chemical power systems today and has a good development prospect. At present, due to the rapid development and wide application of various portable electronic devices and electric vehicles, the demand for lithium-ion batteries with high rate performance, safety performance and good cycle performance is very urgent. [0003] The anode material is the key material ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M4/587H01M10/0525H01M10/42
CPCH01M4/366H01M4/587H01M4/624H01M4/625H01M10/0525H01M10/4235H01M2004/027Y02E60/10
Inventor 和百正和明刚郭爱霞
Owner JIAOZUO JUNENG ENERGY TECH
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