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Lithium-salt-modified lithium ion battery anode material and preparation method thereof

A lithium-ion battery and modified technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of high-current charge and discharge of graphite anode materials, unsatisfactory high-power performance and cycle performance, reducing the volume specific energy of lithium-ion batteries, It is difficult to meet the needs of lithium batteries and other problems

Inactive Publication Date: 2015-03-04
天津锦美碳材科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although graphite materials are widely used, there are two main disadvantages: one is that graphite materials are based on LiC 6 The theoretical specific capacity is only 372 mAh / g, and the actual specific capacity is around 320 mAh / g, which is difficult to meet the needs of the lithium battery market.
Second, due to the structural characteristics of graphite itself and the principle of lithium storage, the high-current charge and discharge, high-power performance and cycle performance of graphite anode materials are not ideal
One of the methods to improve high-current charging and discharging, high-power performance and cycle performance is to increase the diffusion coefficient of lithium ions in the negative electrode material, such as adding carbon nanotube carbon materials to the graphite negative electrode material, but this method also has its limitations. Carbon nanotubes are divided into single-wall and multi-wall types. It is not easy to control the ratio of each other when synthesizing carbon nanotubes, and a large amount of use will increase the material cost of lithium-ion batteries and reduce the volume specific energy of lithium-ion batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 9.90 g of artificial graphite and 0.10 g of lithium carbonate, and fully dissolve lithium carbonate with 10 ml of deionized water; add the graphite into the lithium carbonate solution and mix it with a micro mixer for 2 hours, then put the mixture into an oven for 100 o C is baked until no free water exists to obtain the precursor; the precursor is put into the experimental push plate type tunnel kiln, at 900 o Pass through the tunnel kiln at a constant speed at C, take out and grind fully to obtain the lithium-modified lithium-rich porous graphite negative electrode material.

Embodiment 2

[0017] Weigh 9.95g of artificial graphite and 0.05g of lithium carbonate, and fully dissolve lithium carbonate with 10ml of deionized water; add the graphite into the lithium carbonate solution and mix it with a micro mixer for 2h, then put the mixture into an oven for 100 o C is baked until no free water exists to obtain the precursor; the precursor is put into the experimental push plate type tunnel kiln, at 900 o Pass through the tunnel kiln at a constant speed at C, take out and grind fully to obtain the lithium-modified lithium-rich porous graphite negative electrode material.

Embodiment 3

[0019] Weigh 9.97 g of artificial graphite and 0.03 g of lithium carbonate, and fully dissolve lithium carbonate with 10 ml of deionized water; add the graphite into the lithium carbonate solution and mix it with a micro mixer for 2 hours, then put the mixture into an oven for 100 o C is baked until no free water exists to obtain the precursor; the precursor is put into the experimental push plate type tunnel kiln, at 900 o Pass through the tunnel kiln at a constant speed at C, take out and grind fully to obtain the lithium-modified lithium-rich porous graphite negative electrode material.

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Abstract

The invention relates to a lithium-salt-modified lithium ion battery anode material and a preparation method thereof. A dipping solid-phase technology is employed to distribute lithium ion in a lithium-containing compound in a graphite anode material, so that the lithium-modified lithium ion battery lithium-rich multi-channel type graphite anode material is obtained. The provided lithium ion battery anode material has the advantages of high initial charge / discharge efficiency, good cycling stability and the like. Additionally, the preparation method can be performed in air, the preparation process is simple, small-molecular gaseous oxides generated through high-temperature decomposition of a lithium salt compound or a mixture is capable of breaking through micro-nano channels in an anode carbon particle and clearing away obstacles in the channels in a diffusion and exhausting process, rapid channels for diffusion of lithium ion are provided, the diffusion coefficient of lithium ion in the anode material is improved, electrochemical polarization is reduced, and the heavy-current high-efficiency charge / discharge performance of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the preparation and modification method of a negative electrode material of a lithium ion battery, and belongs to the technical field of new energy material preparation. Background technique [0002] Lithium-ion batteries have the advantages of high monomer voltage, large specific energy, long cycle life, no memory effect, safety, pollution-free, and pollution-free. In recent years, they have been widely used in civilian fields such as 3C, electric tools, electric bicycles, and electric vehicles. Among them, green energy, which is known as the most potential for development in the 21st century and can replace traditional energy, has broad application prospects. [0003] In recent years, due to the continuous improvement of performance requirements for lithium-ion batteries, such as volume specific energy and charging time, for mobile devices and communication equipment, electric bicycles and electric vehicles have put forward r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCH01M4/133H01M4/1393H01M4/364H01M4/587Y02E60/10
Inventor 臧文平赵继国殷正娥兰建云赵旭刘志鹏
Owner 天津锦美碳材科技发展有限公司
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