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Low-temperature-resistant low-cobalt positive electrode material and preparation method thereof

A positive electrode material, low temperature resistant technology, applied in positive electrodes, battery electrodes, active material electrodes, etc., can solve the problems affecting the normal use of electric vehicles, poor discharge performance, poor performance, etc., to achieve low preparation cost, improve low temperature performance, Simple preparation process

Pending Publication Date: 2021-06-25
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Low cobalt nickel cobalt manganese ternary layered cathode material LiNi x co y mn z o 2 (x+y+z=1, 0.5≤x<1, 0<y<0.2, 0<z<1), the cobalt content is low, which can effectively reduce the cost of raw materials, but the low cobalt content will cause the material to be used at low temperature ( <0°C) performance is poor, especially the low-temperature rate discharge performance is poor, which affects the normal use of electric vehicles at low temperatures

Method used

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  • Low-temperature-resistant low-cobalt positive electrode material and preparation method thereof
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  • Low-temperature-resistant low-cobalt positive electrode material and preparation method thereof

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preparation example Construction

[0037] The second aspect of the present invention is to provide a method for preparing the low-temperature resistant and low-cobalt cathode material described in the first aspect of the present invention, the method comprising the following steps:

[0038] Step (1) mixing a low-cobalt precursor, a lithium-containing compound and a modifying additive containing an E element.

[0039]In step 1 of the present invention, the low-cobalt precursor is selected from one or more of oxides, hydroxides, and carbonates containing nickel, cobalt, and manganese; The cobalt precursor can combine the advantages of nickel to increase the specific capacity, manganese to improve the stability and safety performance of the material structure, and cobalt to improve the cycle performance of the material, so that the prepared positive electrode material has both high specific capacity and excellent structural stability. Excellent performance such as high safety performance and good cycle performance...

Embodiment approach

[0041] According to a preferred embodiment of the present invention, the low-cobalt precursor is a hydroxide of nickel-cobalt-manganese, more preferably Ni x co y mn z (OH) 2 , wherein, x+y+z=1, 0.5≤x<1, 0<y<0.2, 0<z<1.

[0042] In the present invention, the lithium-containing compound and the modified additive containing E are also preferably compounds that do not produce other by-products after the reaction and increase the post-treatment process, especially those that do not have strong oxidizing properties, do not produce sulfides, fluorides and impurities Anionic lithium-containing compounds and E-containing modifying additives.

[0043] The lithium-containing compound is selected from one or more of lithium-containing inorganic salts, hydroxides, organic salts and oxides; preferably lithium-containing carbonates, hydroxides, organic salts and oxides One or more; more preferably one or more selected from lithium-containing carbonates, acetates, hydroxides and oxides, ...

Embodiment 1

[0074] Weigh 34.6g Li respectively 2 CO 3 , 80g Ni 0.55 co 0.15 mn0.30 (OH) 2 and 0.045g WO 3 , mixed with a high-speed mixer for 30 minutes, then placed in a muffle furnace and sintered at 950 ° C for 12 hours, cooled to room temperature naturally, and finally crushed with a pulverizer and passed through a 300-mesh sieve to obtain a doped low-temperature resistant low-cobalt nickel-cobalt-manganese Yuan cathode material.

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Abstract

According to the preparation method of the low-temperature-resistant low-cobalt positive electrode material provided by the invention, the positive electrode material is prepared from a low-cobalt precursor, a lithium-containing compound and an E-containing compound through a one-time sintering process, and the positive electrode material is wide in raw material source and low in preparation cost; A button cell prepared from the positive electrode material has excellent electrochemical performance at low temperature, has relatively high low-temperature rate performance and relatively high specific discharge capacity at -20 DEG C, and can be applied to a low-temperature environment.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to an improved low-cobalt nickel-cobalt-manganese ternary layered positive electrode material LiNi x co y mn z o 2 (x+y+z=1, 0.5≤x<1, 0<y<0.2, 0<z<1) method for low-temperature rate performance. Background technique [0002] With the development of the world economy, people's living standards continue to improve, the number of cars, especially the rapid growth of private cars, has brought about the shortage of oil resources, environmental pollution caused by vehicle exhaust and other issues, research and development of new energy vehicles such as: pure electric vehicles ( Electric Vehicle (EV) and Hybrid Electric Vehicle (HEV) are imminent. As one of the most potential power battery systems for EV, HEV, and PHEV in the future, the new "21st century green battery" - lithium-ion secondary battery will usher in unprecedented devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 张媛娇黄佳佳凌仕刚沙金朱卫泉苏迎春
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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