Reversably removal lithium embedded material for cathode of lithium ion battery and its preparation

A lithium-ion battery, intercalation technology, applied in the direction of electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems of cycle performance degradation, poor anti-overcharge ability, high price, etc., and achieve a wide charging and discharging voltage window, The effect of easy control and simple preparation method

Inactive Publication Date: 2007-02-14
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

But when the delithiation voltage is higher than 1.4V, Li 2.6 co 0.4 The N structure will be destroyed, resulting in irreversible capacity, resulting in a rapid decline in cycle performance, that is to say, its ability to prevent overcharge is poor
In addition, the price of Co is relatively expensive
Even so, due to the unique valency of transition metals, currently for Li metal nitrides Li x m y The research on N is still mainly li

Method used

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  • Reversably removal lithium embedded material for cathode of lithium ion battery and its preparation
  • Reversably removal lithium embedded material for cathode of lithium ion battery and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]Weigh 100mg of lithium tablets, in N 2 Under the protection of the atmosphere, heat treatment at 100°C for 15 hours. When the metallic white lithium flakes were completely transformed into dark red, they were taken out and placed in a glove box. Grind it with an agate mortar and sieve it through a 200-mesh sieve to prepare Li 3x SiO 2 N x Required Li 3 N powder precursor.

[0027] In a glove box filled with Ar gas, weigh an appropriate amount of Li at a molar ratio of 5:3 3 N and Si powders (5 SiN y (where 0

[0028] The product after the reaction is made into an electrode sheet according to the electrode sheet preparation process, and is used as a counter electrode with metal Li to make a button battery, and the electrolyte is LiPF 6 / EC: DMC (1:1, Vol). The test charge and discharge current density is 0.24mA / cm 2 , Cut-off charge and discharge voltage 0 ~ 3V. The first reversible capacity of the prepared material reaches more than 400mAh / g, and the f...

Embodiment 2

[0030] Li 3 The preparation of N powder is the same as in Example 1.

[0031] In a glove box filled with Ar gas, weigh an appropriate amount of Li at a molar ratio of 5:3 3 N and nano-silicon powder, mixed evenly, and placed in a stainless steel ball mill jar, sealed. And fill the ball mill with pure N 2 , when it is determined that the tank is completely filled with nitrogen, seal the ball mill tank. At room temperature, the ball mill was milled at a frequency of 450 rpm for 20 hours. To obtain the desired product, its chemical formula is Li 5 SiN y (wherein 1.67

Embodiment 3

[0033] Li 3 The preparation of N powder is the same as in Example 1.

[0034] In a glove box filled with Ar gas, weigh an appropriate amount of Li at a molar ratio of 3:1 3 N and SiO 2 Powder, mixed evenly, and placed in a stainless steel ball mill jar, sealed, at this time the ball mill jar was full of Ar gas. At room temperature, the ball mill was milled at a frequency of 600 rpm for 10 hours. The desired product Li 9 SiO 2 N 3 . The reaction product, the electrochemical test process is the same as in Example 1. The prepared composite anode material has a reversible capacity of more than 600mAh / g for the first time, and after 10 cycles, the capacity has almost no fading.

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Abstract

The chemical formula of the material is LixSiNy, or LixSiO2Ny, 0<x<9, 0<y<5, which possesses the network structure of Li-Si-O-N or Li-Si-N, and exists in the status of compound., After the first de-lithium processing, the material keeps in the amorphism status. According to the mechanical chemical method, the produced Li3N is mixed with the nanometer or micrometer powder. In the inert atmosphere, the convertible de-embedded lithium material is generated after the grinding processing. The Li3SiNy is produced (1.67<y<3), after 16 times recycling, the capability conability conservation rate is 80%.

Description

technical field [0001] The invention relates to a reversible deintercalation lithium material which can be used as a negative electrode of a lithium ion battery and a preparation method thereof. It specifically relates to a class of lithium silicon nitride and lithium silicon oxynitride materials prepared by mechanochemical methods with high specific capacity, reversibility of electrochemical lithium intercalation and lithium removal, and stable cycle performance, and a preparation method thereof. It belongs to the field of lithium ion batteries and devices. Background technique [0002] In order to meet the miniaturization development of portable electronic devices and the extensive demand for large-capacity and high-power chemical power sources for electric vehicles, the development of high specific capacity and long-life lithium-ion batteries is undoubtedly an important development direction of lithium-ion batteries in the future. Therefore, the research and development ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/04C01D15/00
CPCY02E60/12Y02E60/10
Inventor 文钟晟王可解晶莹赵家昌王保峰
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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