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Metal phosphide used as lithium ion secondary battery cathode material and preparation method thereof

A metal phosphide and secondary battery technology, applied in phosphide, electrode manufacturing, battery electrodes, etc., can solve problems such as difficulty in finding suitable positive electrode materials, no significant improvement in cycle performance, and increased difficulty in lithium-poor positive electrode materials. It is conducive to large-scale promotion and application, has great practical significance in production, and is easy to control the preparation process

Inactive Publication Date: 2009-10-14
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this ternary phosphide can improve the cycle performance of lithium phosphide to a certain extent, after adding lithium nitride, not only the capacity increase is not obvious, the cycle performance is not greatly improved, but also the production cost is increased.
In addition, since the technical solution of this patent is to pre-add lithium in the phosphide to obtain a lithium-rich negative electrode material, the difficulty in selecting a lithium-poor positive electrode material is greatly increased, and it is difficult to find a suitable positive electrode material to pair with it.

Method used

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  • Metal phosphide used as lithium ion secondary battery cathode material and preparation method thereof
  • Metal phosphide used as lithium ion secondary battery cathode material and preparation method thereof
  • Metal phosphide used as lithium ion secondary battery cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The ratio of manganese to phosphorus (Mn:P) is 50%:50%. Weigh manganese powder and red phosphorus powder according to the stoichiometric ratio Mn:P=50%:50% (that is, the molar ratio of manganese to phosphorus is equal to 1:1), and put them into a sealed ceramic ball mill jar with a ball-to-material ratio of 5:1. Under an argon atmosphere, ball milling was performed. The ball mill was ball milled at room temperature at a speed of 400 rpm for 40 hours. The phase structure after ball milling is shown in figure 1 . It can be seen from the figure that manganese Mn still appears in crystalline state after ball milling, while phosphorus P appears in amorphous state. Apart from this, no other phases are formed. The powder obtained after ball milling was pressed into tablets and placed in a tube furnace. In an argon atmosphere, the temperature was gradually raised to 980°C. At this temperature, pre-fired for 12 hours. After naturally cooling to room temperature, the pre-c...

Embodiment 2

[0039] The ratio of manganese to phosphorus (Mn:P) is 25%:75%. The preparation method of this embodiment is the same as that of Example 1. Weigh manganese powder and red phosphorus powder according to the stoichiometric ratio (Mn:P=25%:75%) (that is, the molar ratio of manganese to phosphorus is equal to 1:3), and put them into a sealed ceramic ball mill jar with a ball-to-material ratio of 8. : 1. Under an argon atmosphere, ball milling was performed. The ball mill is at room temperature with a rotating speed of 400 rpm, and the ball milling time is 40 hours. The phase structure after ball milling and figure 1 Similarly, manganese Mn still appeared in crystalline state after ball milling, while phosphorus P showed amorphous state without other phases formed. The powder obtained after ball milling was pressed into tablets and placed in a tube furnace. In an argon atmosphere at atmospheric pressure, gradually raise the temperature to 950°C. At this temperature, pre-fired ...

Embodiment 3

[0042] The tin-phosphorus feed ratio (Sn:P) is 15%:85%. The preparation method of this embodiment is the same as that of Example 1. Weigh tin powder and red phosphorus powder according to the stoichiometric ratio (Sn:P=15%:85%) (that is, the molar ratio of tin to phosphorus is equal to 3:17), and put them into a ceramic ball mill jar with a ball-to-material ratio of 10:1 . Under an argon atmosphere, at a rotational speed of 100 rpm, the ball milling time was 50 hours. The phase structure after ball milling and figure 1 resemblance. At room temperature, the powder obtained after ball milling was pressed into tablets and placed in a tube furnace. In an argon atmosphere at normal pressure, the temperature was gradually raised to 400°C. At this temperature, pre-baking was performed for 30 hours. After naturally cooling to room temperature, the pre-calcined product was ground into powder, pressed into tablets and placed in the tube furnace again. In an argon atmosphere at at...

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Abstract

The invention discloses a metal phosphide used as lithium ion secondary battery cathode material, which consists of phosphorus and metallic element M. The formula is MxPy, wherein x is larger than or equal to 0.15, and less than or equal to 0.85, and y is larger than or equal to 0.15 and less than or equal to 0.85. The invention also discloses a preparation method for the metal phosphide. The metal phosphide used as lithium ion secondary battery cathode material has higher capacity and better cycle performance, and is suitable for being used as lithium ion secondary battery cathode material; simultaneously, the equipment used by the preparation method of the metal phosphide is simple, and technological conditions are easy and convenient, thereby being beneficial for large scale of popularization and application and having great productive practice significance.

Description

technical field [0001] The invention relates to the technical field of lithium ion secondary batteries, in particular to a metal phosphide used as a negative electrode material of lithium ion secondary batteries and a preparation method thereof. Background technique [0002] With the improvement of people's living standards, electronic products such as mobile phones, notebook computers, digital video cameras, and digital cameras have become common high-tech consumer goods in people's modern life and work. In addition, due to the advent of mobile phones with camera functions and the popularization of notebook computers, the demand for high-capacity lithium-ion secondary batteries has increased significantly, so that its application range has been continuously expanded, from the information industry to the energy transportation industry, from space Underwater, it has gradually entered various fields of human society. [0003] At present, commercialized lithium-ion secondary b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/04C01B25/08
CPCY02E60/12Y02E60/10
Inventor 杨化滨王哈妮
Owner NANKAI UNIV
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