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Lithium ion battery negative electrode active material, preparation method thereof and lithium ion battery

A negative electrode active material and lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electronic conduction, material volume expansion, volume expansion, etc., and achieve small difference between charge and discharge platforms, high initial Effects of Coulombic efficiency and proper working potential

Inactive Publication Date: 2020-06-12
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrode material of this alloy-type reaction will undergo a series of irreversible structural changes and huge volume expansion during the lithium storage process, which makes the first Coulombic efficiency of this type of material low, and the volume of the material will cause huge volume expansion. , leading to cracking, pulverization and shedding of the electrode, which seriously hinders the practical application of this type of alloy-type negative electrode material in full batteries
[0004] Therefore, it is necessary to develop a new lithium-ion battery material that can solve the problems of poor ion and electronic conductivity and rapid volume expansion of single-active negative electrode materials for lithium-ion batteries.

Method used

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  • Lithium ion battery negative electrode active material, preparation method thereof and lithium ion battery
  • Lithium ion battery negative electrode active material, preparation method thereof and lithium ion battery
  • Lithium ion battery negative electrode active material, preparation method thereof and lithium ion battery

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preparation example Construction

[0043] The present invention provides a method for preparing a lithium-ion battery negative electrode active material described in any one of the above technical solutions, comprising:

[0044] It is obtained by mixing copper powder, germanium powder and phosphorus powder according to the stoichiometric ratio of the chemical formula, and ball milling under the condition of inert gas.

[0045] In the present invention, copper powder, germanium powder and phosphor powder are firstly mixed according to the metering ratio of the chemical formula, and the mixing ratio is the metering ratio of the above chemical formula. The sources of the above copper powder, germanium powder and phosphor powder are not limited and can be purchased commercially.

[0046] Then fill the inert gas as a protective gas to isolate the air to prevent the material from reacting with oxygen or other substances in the air during the ball milling process. Then set the ball milling parameters in the high-energ...

Embodiment 1

[0060] According to the stoichiometric ratio (molar ratio) of the chemical formula of the desired synthetic substance (CuGe 2 P 3 ), M Cu =63.546, M Ge =72.63, M P = 30.973. Stoichiometric ratio Cu:Ge:P=1:2:3; Material collection: 3g of material is taken in total, that is, 0.6318g of Cu powder, 1.4443g of Ge powder, and 0.9239g of P powder are put into the ball mill tank, and then 25 stainless steel ball mills are added Beads, ensure that the ratio of ball to material is 20:1, and then fill with inert gas as a protective gas to isolate the air and prevent the material from reacting with oxygen or other substances in the air during the ball milling process. Then set the ball milling parameters in the high-energy ball mill (every ball milling 1h interval 25min, the speed is 1200r, the total ball milling time 6h, one-way ball milling), and then take the material under the atmosphere of inert gas, and take the material to measure XRD, XRD The result is as figure 1 .

Embodiment 2

[0062] According to the stoichiometric ratio (molar ratio) of the chemical formula of the desired synthetic substance (CuGe 4 P 3 ), take 0.4264g of Cu powder, 1.9499g of Ge powder, and 0.6237g of P powder and put them into the ball mill tank to ensure that the ball-to-material ratio is 20:1, and then fill in an inert gas as a protective gas to isolate the air, so as to prevent the material from contacting the oxygen in the air during the ball milling process. or react with other substances. Then set the ball milling parameters in the high-energy ball mill (every ball milling 1h interval 25min, rotating speed 1200r, total ball milling time 10h, one-way ball milling), and then take the material under the atmosphere of inert gas, take the material and measure the XRD, XRD The result is as figure 2 .

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Abstract

The invention provides a lithium ion battery negative electrode active material. The lithium ion battery negative electrode active material is a compound CuGe<2+x>P3 with a structure shown in a formula (I), wherein 0<=X<=10. According to the invention, a Cu element with high conductivity and Ge with lithium reaction activity are subjected to ball milling by using a high-energy ball milling method;the CuGe2P3 material is synthesized by simultaneously introducing a P element into a sphalerite structure of a component, and Ge solid solution is carried out on the material by using a high-energy ball milling method, so that CuGe2 + XP3 series materials are successfully prepared, and the charge-discharge platform of the material is adjustable. The obtained series of materials have the advantages of high initial coulombic efficiency, high specific capacity, proper working potential and small charging and discharging platform difference.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery negative electrode active material, a preparation method thereof and a lithium ion battery. Background technique [0002] With the gradual shortage of fossil energy and the increasing environmental problems, it is urgent to find clean alternative energy. These clean energy sources generally refer to wind energy, tidal energy, solar energy, etc., but these energy sources generally have an obvious shortcoming—timeliness. Therefore, energy storage devices emerged as the times require. [0003] Among many energy storage devices, lithium-ion batteries are regarded as the preferred power source because of their advantages such as the highest energy density, environmental friendliness, no memory effect, light weight, and small size. Batteries are composed of positive electrode materials, electrolytes, separators and negative electrode materials. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5805H01M10/0525Y02E60/10
Inventor 李文武沈鹏飞马齐斌廖俊张海燕
Owner GUANGDONG UNIV OF TECH
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