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Cathode material for lithium ion battery and preparation method thereof, and lithium ion battery

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of electrochemical stability of materials and thermal decomposition temperature drop, etc., to improve cycle stability, operation, reduce The effect of internal resistance

Active Publication Date: 2019-06-07
河南省鹏辉电源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] One of the objects of the present invention is to provide a lithium-ion battery positive electrode material to alleviate the electrochemical stability and thermal decomposition temperature of the existing high-nickel content ternary material, although the energy density of the material can be improved. Decline, technical issues at the point where safety concerns arise

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  • Cathode material for lithium ion battery and preparation method thereof, and lithium ion battery
  • Cathode material for lithium ion battery and preparation method thereof, and lithium ion battery
  • Cathode material for lithium ion battery and preparation method thereof, and lithium ion battery

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preparation example Construction

[0050] According to a second aspect of the present invention, the present invention provides a method for preparing a positive electrode material for a lithium ion battery, comprising the steps of coating a carbon-containing polymer on the surface of a ternary positive electrode material, carbonizing the carbon-containing polymer, The positive electrode material of the lithium ion battery in which the surface of the ternary positive electrode material is coated with the carbon material is obtained.

[0051] At present, there are three solutions to the electrochemical stability problem of high-nickel ternary cathode materials; the first solution is to dope other metal elements (Al, Mg, Ti, Zr) in high-nickel ternary cathode materials, and these other The doping and coating of metal elements can improve the structural stability and cycle stability of the material, thereby improving the electrochemical stability of the material. The doping process requires a higher temperature, co...

Embodiment 1

[0080] This embodiment provides a lithium ion battery positive electrode material, which includes LiNi 0.5 co 0.2 m 0.3 o 2 , LiNi 0.5 co 0.2 m0.3 o 2 The surface is coated with carbon material, wherein the carbon material accounts for 0.5wt% in the positive electrode material of the lithium ion battery.

[0081] The lithium-ion battery cathode material provided in this example is prepared according to the following steps:

[0082] (1) Add the cuprous chloride and pyridine solution into the three-necked flask, bubble it with oxygen and stir evenly. When the cuprous chloride is completely dissolved, add m-diacetylene benzene monomer, and react at room temperature for 15 minutes to form poly m-diacetylene Acetylene benzene. Pour the reacted solution into a mixture of methanol and hydrochloric acid and stir for 30 minutes to completely precipitate polym-diacetylenebenzene from the solution. After washing and drying, fibrous polym-diacetylene benzene is obtained;

[0083]...

Embodiment 2

[0086] This embodiment provides a lithium ion battery positive electrode material, which includes LiNi 0.5 co 0.2 m 0.3 o 2 , LiNi 0.5 co 0.2 m 0.3 o 2 The surface is covered with carbon material, wherein the carbon material accounts for 10wt% of the positive electrode material of the lithium ion battery. The preparation method of the lithium-ion battery cathode material provided in this example is the same as Example 1, the difference is that in step (2), 10 parts of poly-m-xylene, LiNi 0.5 co 0.2 m 0.3 o 2 90 parts; in step (3), the carbonization temperature is 240° C., and the carbonization time is 6 min.

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Abstract

The present invention provides a cathode material for a lithium ion battery and a preparation method thereof, and a lithium ion battery, and relates to the technical field of battery materials. The cathode material for the lithium ion battery comprises a ternary cathode material, and the surface of the ternary cathode material is coated with a carbon material; and the technical problem is relievedthat a current ternary material with high nickel content can improve the energy density of the material but can cause the decreasing of the electrochemical stability and the thermal decomposition temperature of the material to cause the safety problem. According to the cathode material for the lithium ion battery, the surface of the ternary cathode material is coated with the carbon material to mutually cooperate the ternary cathode material with the carbon material so as to improve the conductivity, reduce the heat discharged in the charge-discharge process, prevent the cathode material frombeing heated and decomposed, improve the safety performance of the lithium ion battery, prevent an electrolyte and the ternary cathode material from direct contact and improve the cycling stability of the cathode material for the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a lithium-ion battery cathode material, a preparation method and a lithium-ion battery. Background technique [0002] As a cathode material for lithium-ion batteries, the theoretical energy density of lithium iron phosphate mainly used in the market is only 180Wh / Kg, which is difficult to meet the needs of high-energy-density batteries for electric vehicles and mobile devices. The energy density of ternary materials is relatively high, so they have great application prospects. However, in order to further increase the energy density of ternary materials, it is necessary to improve the ternary materials. Scientists and technicians have found through experiments that increasing the content of nickel in the ternary system can also significantly increase the energy density of the battery. However, as the nickel content in the ternary material increases, the electrochemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 闫龙龙刘建生
Owner 河南省鹏辉电源有限公司