Cathode material of lithium battery and preparation method thereof

A negative electrode material, technology of lithium ion battery, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle performance and rate performance, loss of active material of lithium battery, low utilization rate of sulfur cathode, etc., to achieve cycle stability Improved, excellent cycle stability, high discharge capacity effect

Active Publication Date: 2019-02-15
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because polysulfide ion, an intermediate product of electrochemical reaction, is easily soluble in organic electrolyte, shuttle phenomenon and corrosion of metal lithium negative electrode will occur, resulting in loss of active material of lithium battery and large energy loss. In addition, elemental sulfur and discharge product lithium sulfide The characteristics of electrical insulation, and the huge volume change of positive and negative electrode materials during the reaction process destroys the electrode structure. The current lithium battery has the disadvantages of low utilization rate of sulfur positive electrode, poor cycle performance and rate performance, which has become a bottleneck for its practical application.

Method used

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  • Cathode material of lithium battery and preparation method thereof
  • Cathode material of lithium battery and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment example 1

[0023] Step 1: Preparation of Ni-ZIF-67@CC / CNTS composite:

[0024] 1400mg of Co(NO 3 ) 2 ·6H 2 O was added to 200ml of anhydrous methanol and stirred; 1600mg of 2-methylimidazole was added to 200ml of anhydrous methanol and stirred, and the solution mixed with 2-methylimidazole was slowly poured into the still stirring Co(NO 3 ) 2 ·6H 2 O solution and add a little carbon cloth, stir for 30min and let stand. After 24 h the solution was centrifuged and dried. Take 350mgNi(NO 3 ) 2 ·6H 2 O was dissolved in 100ml of absolute ethanol, and the prepared ZIF-67 / CC was added to the above solution. Reflux at 80°C for 60 minutes. Obtained Ni-ZIF-67 / CC composite material.

[0025] Step 2: Preparation of Ni-ZIF-67@CC / CNTS composite:

[0026] Put the Ni-ZIF-67 / CC composite material prepared in the first step into a porcelain boat, put the porcelain boat into a tube furnace, heat up to 600°C, first pass argon, then hydrogen, and finally acetylene, After the reaction was complet...

Embodiment example 2

[0030] The first step: Preparation of Ni-ZIF-67@CC composite material:

[0031] 1500mg of Co(NO 3 ) 2 ·6H 2 O was added to 200ml of anhydrous methanol and stirred; the 2-methylimidazole of 1700mg was added to 200ml of anhydrous methanol and stirred, and the solution mixed with 2-methylimidazole was slowly poured into the still stirring Co(NO 3 ) 2 ·6H 2 O solution and add a little carbon cloth, stir for 30min and let stand. After 24 h the solution was centrifuged and dried. Take 350mgNi(NO 3 ) 2 ·6H 2 O was dissolved in 100ml of absolute alcohol, and the prepared ZIF-67 / CC was added to the above solution. Reflux at 80°C for 60 minutes. Obtained Ni-ZIF-67 / CC composite material.

[0032] Step 2: Carbonization of Ni-ZIF-67@CC / CNTS composite:

[0033] Put the Ni-ZIF-67 / CC composite material prepared in the first step into a porcelain boat, put the porcelain boat into a tube furnace, heat up to 700°C, first pass argon, then hydrogen, and finally acetylene, After the reac...

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Abstract

The invention relates to a cathode material of a lithium battery and a preparation method thereof. A Ni-ZIF-67@CC/CNTS nanometer composite material is prepared by carrying out a chemical vapor deposition on a long carbon nanotube on cloth C. The Ni-ZIF-67@CC/CNTS nanometer composite material prepared by using a chemical vapor deposition method has a fuzzy porous structure, is used for lithium battery cathodes and is conducive to lithium ion transporting; moreover, the porous structure is more easier to carry sulfur; the electrochemical performance of the cathode material of the lithium batteryis obviously improved; the fade of discharge capacity in the circulation process is very small; the battery capacity and the circulation stability of a lithium ion battery are effectively improved; polysulfide is very well adsorbed; and the shuttle effect of the polysulfide is suppressed.

Description

technical field [0001] The technical solution of the present invention relates to an electrode made of an active material, to be precise, a method for preparing a negative electrode material of a lithium battery. Background technique [0002] In the past 20 years, lithium-ion batteries have achieved great commercial success, but limited by the limit of theoretical energy density, it is difficult to meet the needs of the rapid development of new energy technologies, and it is necessary to develop a secondary battery system with higher energy density. In theory, lithium reacts completely with sulfur to form Li 2 S, which can realize 2-electron reaction, and the atomic weight of elemental sulfur is significantly lighter than the intercalation compound cathode material of the current commercial lithium-ion battery, is the most potential high-capacity electrode material, and its theoretical specific capacity of the electrode can be as high as 1675mAh / g. The theoretical energy de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/364Y02E60/10
Inventor 张永光侯泽凡
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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