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Ball milling process of preparing lithium nitride for negative electrode material of lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in the directions of alkali metal compounds, lithium compounds, battery electrodes, etc., and can solve the problems of high reaction temperature, complicated operation, and long time consumption.

Inactive Publication Date: 2002-09-25
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only requires a higher reaction temperature, but also is more complicated to operate, takes a long time, and needs to be pulverized before application.

Method used

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  • Ball milling process of preparing lithium nitride for negative electrode material of lithium ion battery
  • Ball milling process of preparing lithium nitride for negative electrode material of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Preparation of lithium-copper-nitride negative electrode material. Under an Ar atmosphere, a certain amount of lithium nitride powder and metal copper powder (200 mesh) were uniformly mixed according to the ratio of Li:Cu=2.6:0.4, and placed in a Planetary Mono Mill Pulverisette type 6 ball mill. The capacity of the ball mill container is about 80ml, and fifteen steel balls with a diameter of 10mm are built in the container. Both the grinding steel balls and the ball mill container are made of stainless steel. Fill a certain amount of N into the ball mill container 2 The gas is then sealed by an O-ring. The ball mill was rotated at a frequency of 500 rpm for 5 hours at room temperature.

[0028] The prepared Li 2.6 Cu 0.4 The lithium intercalation capacity of the N material for the first time is 750mAh / g, and the capacity retention rate after 20 cycles is 80% (the cut-off charge-discharge voltage is 0-1.3V).

Embodiment 2

[0030] Preparation of lithium-cobalt-nitride negative electrode material. As described in Example 1, lithium nitride powder and metal cobalt powder (200 mesh) were ball milled in a high energy ball mill for 5 hours according to the ratio of Li:Co=2.6:0.4. The prepared Li 2.6 co 0.4 The first delithiation capacity of the N material is 950mAh / g, and after 10 cycles, the intercalation and delithiation capacity is still 850mAh / g (the cut-off charge and discharge voltage is 0-1.4V).

Embodiment 3

[0032] Preparation of lithium-nickel-nitride negative electrode material. As described in Example 1, lithium nitride powder and metal nickel powder (200 mesh) were ball-milled in a high-energy ball mill for 10 hours according to the ratio of Li:Ni=2.5:0.5. The prepared Li 2.5 Ni 0.5 The reversible intercalation and delithiation capacity of N material is 460mAh / g, while the reported Li 2.5 Ni 0.5 N reversible lithium intercalation capacity is 200mAh / g (cut-off charge and discharge voltage 0-1.4V).

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Abstract

This invention relates to prepare nitride of metal Li as the cathode material of Li battery by matching and mixing uniformly according to the Li3-xMxN general formulation LIN powder in inert gas putting in ball grinding mill with protecting gas and O-type seal ring to control the rotating speed of the ball grinding mill to 400-600 / m with in 5-20 hours In Li3-xMxN,M belongs to IIIA, IVA and VA groups in periodic table of elements and each of the transition metal elements contains one of the Co, Cu or Ni. The quantity of the Li metal-nitride material prepared with said ball grinding method reaching to much higher than the normal value with excellent circulation. It is an ideal substitute cathode material of Li-ion battery.

Description

technical field [0001] The invention relates to a new preparation method of lithium metal nitride. Such nitrides can be used as anode materials for lithium-ion batteries, with high specific capacity, high charge-discharge reversibility and stability. More precisely, it relates to a method of ball milling to prepare the general formula Li 3-x m x Lithium metal nitride of N. Background technique [0002] With the rapid development of the electronics and information industries, electronic instruments and equipment tend to be miniaturized gradually, and new portable electromechanical products are also constantly coming out, such as notebook computers, digital cameras and mobile phones. The development of portable devices has put forward urgent requirements for small power supplies, especially high-energy secondary batteries. Safe, low-cost, and non-environmental hazard-free high-energy batteries have become key considerations for the development of the battery industry. Lit...

Claims

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Application Information

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IPC IPC(8): C01B21/00C01D15/00H01M4/1397H01M4/58
CPCH01M4/136H01M4/1397H01M4/58H01M10/0525H01M2004/028Y02E60/10
Inventor 杨军王可解晶莹刘宇王保峰
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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