Negative electrode composite lithium-supplemented material for lithium ion battery and preparation method thereof

A lithium-ion battery and lithium-replenishing technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of charging and discharging efficiency not reaching a practical level, reducing effectiveness, restricting popularization and application, and improving the first efficiency. and energy density, improving cycle retention, and long-term cycle performance

Pending Publication Date: 2020-01-24
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common methods of lithium supplementation include in-situ doping lithium supplementation, electrochemical lithium supplementation and chemical pre-supplementation lithium method. However, the above methods have high environmental requirements and have safety hazards such as flammability, which limits the further promotion and application of each method.
[0005] CN110010860A provides a kind of composite negative electrode material that is used for lithium ion battery, comprises silicon/carbon nanotube composite fiber cloth and the carbon layer that forms on its surface, but does not contain lithium ion in this material, so although this material has higher The capacity remaining rate after cycling, but can not achieve the effect of lithium supplementation
CN105914343A provides a negative electrode sheet for lithium ion batteries. This solution adopts electrospinning technology

Method used

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  • Negative electrode composite lithium-supplemented material for lithium ion battery and preparation method thereof
  • Negative electrode composite lithium-supplemented material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0038] Example 1

[0039] This embodiment provides a lithium-ion battery negative electrode composite lithium supplement material, which is prepared by the following steps:

[0040] (1) Add 1 mg of graphene flakes to 30 ml of cyclohexane solution under a nitrogen atmosphere, ultrasonically disperse for 2 hours, and stir magnetically at 40° C. for 12 hours to obtain a graphene dispersion;

[0041] (2) then 1mL concentration is that the butyllithium of 1mol / L joins in step (1) graphene dispersion liquid, mixes and obtains spraying liquid;

[0042] (3) Adopting a spinneret with a diameter of 1.0mm to carry out electrospinning (voltage 20KV, spraying speed 0.02mm / s), spraying the spraying liquid of step (2) onto the collecting plate, and drying;

[0043] (4) Put the product of step (3) in a muffle furnace, and the temperature of the muffle furnace is raised to 700°C at a rate of 5°C / min. Using methane gas as a carbon source, carbon coating is carried out for 3 hours, and the obta...

Example Embodiment

[0054] Example 2

[0055] This embodiment provides a lithium-ion battery negative electrode composite lithium supplement material, which is prepared by the following steps:

[0056] (1) Add 1 mg of graphene flakes to 30 ml of cyclohexane solution in a nitrogen atmosphere, ultrasonically disperse for 2 hours, and magnetically stir at 40° C. for 24 hours to obtain a graphene dispersion;

[0057] (2) then 1mL concentration is 1mol / L tert-butyllithium joins in step (1) graphene dispersion liquid, mixes and obtains spraying liquid;

[0058] (3) Adopting a spinneret with a diameter of 0.6mm to carry out electrospinning (voltage 20KV, spraying speed 0.02mm / s), spraying the spraying liquid of step (2) onto the collecting plate, and drying;

[0059] (4) Put the product of step (3) in a muffle furnace, and the temperature of the muffle furnace is raised to 700°C at a rate of 5°C / min. Using methane gas as a carbon source, carbon coating is carried out for 3 hours, and the obtained mater...

Example Embodiment

[0061] Example 3

[0062] This embodiment provides a lithium-ion battery negative electrode composite lithium supplement material, which is prepared by the following steps:

[0063] (1) Add 1 mg of graphene flakes to 30 ml of cyclohexane solution in a nitrogen atmosphere, ultrasonically disperse for 2 hours, and magnetically stir at 40° C. for 24 hours to obtain a graphene dispersion;

[0064] (2) then 1mL concentration is that the phenyllithium of 1mol / L joins in step (1) graphene dispersion liquid, mixes and obtains spraying liquid;

[0065] (3) Adopting a spinneret with a diameter of 1.6mm to carry out electrospinning (voltage 20KV, spraying speed 0.02mm / s), spraying the spraying liquid of step (2) onto the collecting plate, and drying;

[0066] (4) Put the product of step (3) in a muffle furnace at 700°C, use methane gas as a carbon source, and carry out carbon coating for 3 hours, and the obtained material is the lithium-ion battery negative electrode composite lithium s...

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Abstract

The invention discloses a negative electrode composite lithium-supplemented material for a lithium ion battery. The lithium supplemented-material comprises a compound comprising graphene and metal lithium, the mass ratio of the graphene and metal lithium being 1:(0.7-3.5); the graphene is a spun fibrous carrier; the metal lithium is uniformly distributed in the carrier and on the surface of the carrier; and the metal lithium distributed on the surface of the carrier is coated with a carbon layer. According to the lithium-supplemented material of the invention, an electrostatic spinning technology is adopted to realize the lithium supplementation of the negative electrode material; the fibrous graphene is used as the carrier, so that most of lithium is coated with the fibers; and the lithium supplementation can be continuously realized during the cycle process of the battery so as to improve the cycle retention rate of the battery. The obtained negative electrode composite lithium-supplemented material for the lithium ion battery has stable performance and high safety. With the negative electrode composite lithium-supplemented material for the lithium ion battery, uniform lithium supplementation is realized, the first efficiency and energy density of the lithium ion battery can be improved, and the long cycle performance of the lithium ion battery can be ensured.

Description

technical field [0001] The present application relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery negative electrode composite lithium supplement material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high working voltage, large specific energy, small size, light weight, and long cycle life, making them the focus of the development and competition of the automobile industry. With the continuous development of lithium-ion batteries in the fields of portable electronic devices, electric bicycles and electric vehicles, the requirements for performance such as energy density of lithium-ion batteries are getting higher and higher. [0003] During the first charging and discharging process of a lithium-ion battery, the electrode material will react with the electrolyte at the solid-liquid phase interface to form a solid electrolyte film (SEI film) passivation film, whic...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525H01M10/42D01D5/00D06M11/74D01F9/12D01F1/10B82Y30/00B82Y40/00D06M101/40
CPCH01M4/366H01M4/382H01M4/583H01M10/4242H01M10/0525D01D5/003D01D5/0061D01D5/0076D06M11/74D01F9/12D01F1/10B82Y30/00B82Y40/00H01M2004/027D06M2101/40Y02E60/10
Inventor 张立君陈慧龙段恒志王建军王念贵王瑛
Owner SHANDONG YUHUANG NEW ENERGY TECH
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