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Black-phosphorus-based composite negative electrode material and preparing method thereof

A technology of negative electrode material and black phosphorus, which is applied in the field of black phosphorus-based composite negative electrode material and its preparation, can solve the problems of poor coulombic efficiency, rapid capacity decay and low capacity retention rate of black phosphorus electrode material, so as to solve the problem of poor cycle performance, The effect of low cost and low cost of raw materials

Inactive Publication Date: 2016-10-12
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using black phosphorus electrode as the negative electrode material, in the formation of lithiated product Li 3 There is a huge volume change at P, while Li 3 P itself has low conductivity, which leads to poor coulombic efficiency and low capacity retention of black phosphorus electrode materials.
As the charge-discharge cycle proceeds, the large volume expansion leads to pulverization of the material and rapid capacity decay

Method used

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  • Black-phosphorus-based composite negative electrode material and preparing method thereof
  • Black-phosphorus-based composite negative electrode material and preparing method thereof
  • Black-phosphorus-based composite negative electrode material and preparing method thereof

Examples

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Effect test

Embodiment 1

[0036] In this embodiment, a black phosphorus-based composite negative electrode material is prepared by ball milling (wherein, red phosphorus: germanium oxide = 2:1, and the amount of graphite added is 50% of the total mass of the three raw materials of red scale, germanium oxide and graphite). The mass ratio of black scale, germanium oxide and graphite is 2:1:3.

[0037] The preparation method is as follows:

[0038] (1) Weigh 2 parts of red phosphorus powder and 1 part of germanium oxide powder, mix the two to obtain a mixture, and then add the mixture to a stainless steel ball mill tank for the first ball milling to obtain the first ball milling product; The ball-to-material ratio is 20:1 (that is, adding 60 parts of stainless steel balls), the rotating speed is 300rpm / min, and the ball milling time is 20h;

[0039] (2) take by weighing 3 parts of graphite powder, add in the ball milling product that step (1) obtains for the first time, then carry out ball milling for the...

Embodiment 2

[0044] In this example, a black phosphorus-based composite negative electrode material is prepared by ball milling (wherein, red phosphorus: germanium oxide = 0.25:1, and the amount of graphite added is 50% of the total mass of the three raw materials of red scale, germanium oxide and graphite). The mass ratio of black scale, germanium oxide and graphite is 0.25:1:1.25.

[0045] The preparation method is as follows:

[0046] (1) Weigh 1 part of red phosphorus powder and 4 parts of germanium oxide powder, mix the two to obtain a mixture, then add the mixture to a stainless steel ball mill tank for the first ball mill to obtain the first ball mill product; The ball-to-material ratio is 20:1 (that is, adding 100 parts of stainless steel balls), the rotating speed is 300rpm / min, and the ball milling time is 20h;

[0047] (2) take by weighing 5 parts of graphite powder, add in the ball milling product that step (1) obtains for the first time, then carry out ball milling for the se...

Embodiment 3

[0050] In this example, a black phosphorus-based composite negative electrode material is prepared by ball milling (where red phosphorus: germanium oxide = 2:1, and the amount of graphite added is 80% of the total mass of red scale, germanium oxide and graphite). The mass ratio of black scale, germanium oxide and graphite is 2:1:12.

[0051] The preparation method is as follows:

[0052] (1) Weigh 2 parts of red phosphorus powder and 1 part of germanium oxide powder, mix the two to obtain a mixture, and then add the mixture to a stainless steel ball mill tank for the first ball milling to obtain the first ball milling product; The ball-to-material ratio is 20:1 (that is, adding 60 parts of stainless steel balls), the rotating speed is 300rpm / min, and the ball milling time is 20h;

[0053] (2) take by weighing 12 parts of graphite powder, add in the ball milling product that step (1) obtains for the first time, then carry out ball milling for the second time, the product obtai...

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Abstract

The invention relates to a black-phosphorus-based composite negative electrode material and a preparing method thereof, and belongs to the field of electrochemistry power supply materials. The black-phosphorus-based composite negative electrode material is prepared by combining black phosphorus, germanium oxide and graphite, flake-like germanium oxide particles are uniformly dispersed on the surface of the black phosphorus material, and the surface of germanium oxide / black phosphorus is coated with graphite, wherein the mass ratio of black phosphorus to germanium oxide is (0.25-2):1, and the mass percentage of graphite in the negative electrode material is 5-80%. The black-phosphorus-based composite negative electrode material is prepared through a two-step ball milling method with black phosphorus, germanium oxide and graphite as raw materials. The black-phosphorus-based composite negative electrode material is good in circulation performance, low in cost and stable in structure; the preparing method is simple in technological process, short in consumed time and high in yield, and has the advantages of being low in raw material cost and improving the structural stability of composites, and the problem that the circulation performance of a black-phosphorus-based composite is poor is solved.

Description

technical field [0001] The invention relates to a black phosphorus-based composite negative electrode material and a preparation method thereof, belonging to the field of electrochemical power source materials. Background technique [0002] Lithium-ion battery is a new type of energy storage battery developed in the 21st century. Due to its high energy and low consumption characteristics, lithium-ion batteries have been widely used in mobile phones, electric vehicles, energy storage and other fields. With the current development, the energy density requirements of batteries are getting higher and higher, especially the launch of environmentally friendly electric vehicles has greatly promoted the development of large-capacity, high-power power batteries. At present, graphite and modified graphite are widely used as negative electrode materials in commercial lithium-ion batteries, but their theoretical specific capacity is 372mAh / g, and the actual specific capacity is only 30...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/38H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 戚雯曾宏武英况春江周少雄
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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