Positive electrode material of multi-element layered lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems that the sintering temperature cannot reach the metal oxide, and the structural suppression of Li-Ni and metal oxide intercalation can not be achieved. Good cycle performance, stable structure, improved thermal stability

Inactive Publication Date: 2014-01-08
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can also obtain dopants to a certain extent, it is difficult to embed metal oxides into the NCM matrix because the sintering temperature cannot reach the melting point of the metal oxides, so the obtained NCM doped materials can be obtained from the crystal structure. It is basically a mixed material of metal oxide and NCM, rather than forming a solid solution, so that an ideal dopant cannot be formed, and the generation of Li-Ni mixing cannot be suppressed structurally.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The chemical formula of the lithium-ion battery cathode material in this embodiment is LiNi 0.5 co 0.2 mn 0.29 al 0.01 o 2 , its preparation method comprises the following steps:

[0036] 1) Dosing: mix Mn(NO 3 ) 2 , Ni(NO 3 ) 2 and Co(NO 3 ) 2 The first solution was formulated at a molar ratio of 3:5:2.9, and Al(NO 3 ) 3 Make the second solution, make the third solution with EDTA, and make the fourth solution with NaOH;

[0037] 2) Reaction: Using the parallel flow method, inject the four solutions into the reaction kettle at the same time, stir vigorously, control the pH value between 10-14 during the stirring process, and control the temperature of the reaction kettle at 40-70°C during the reaction process; After completion, filter, wash, and dry to obtain a hydroxide precursor uniformly doped with Al, and there is an inert gas or nitrogen protection in the reaction kettle;

[0038] 3) Pre-sintering: pre-sintering the precursor of step 2) at 500°C for 5 ...

Embodiment 2

[0043] The chemical formula of the lithium-ion battery cathode material in this embodiment is LiNi 0.4 co 0.2 mn 0.39 Mg 0.01 o 2 , its preparation method comprises the following steps:

[0044] 1) Dosing: mix Mn(NO 3 ) 2 , Ni(NO 3 ) 2 and Co(NO 3 ) 2 The first solution was formulated at a molar ratio of 3.9:4:2, and Mg(NO 3 ) 2 Make the second solution, make the third solution with EDTA, and make the fourth solution with NaOH;

[0045] 2) Reaction: Using the parallel flow method, inject the four solutions into the reaction kettle at the same time, stir vigorously, control the pH value between 10-14 during the stirring process, and control the temperature of the reaction kettle at 40-70°C during the reaction process; After completion, filter, wash, and dry to obtain a hydroxide precursor uniformly doped with Mg, and there is an inert gas or nitrogen protection in the reaction kettle;

[0046] 3) Pre-sintering: pre-sintering the precursor of step 2) at 500°C for 5 ...

Embodiment 3

[0051] The chemical formula of the cathode material of the lithium ion battery in this embodiment is LiNi 0.5 co 0.2 mn 0.285 al 0.01 Mg 0.005 o 2 , its preparation method comprises the following steps:

[0052] 1) Dosing: mix Mn(NO 3 ) 2 , Ni(NO 3 ) 2 and Co(NO 3 ) 2 The first solution was formulated at a molar ratio of 2.85:5:2, and Mg(NO 3 ) 2 Make the second solution, make the third solution with EDTA, and make the fourth solution with NaOH;

[0053] 2) Reaction: Using the parallel flow method, inject the four solutions into the reaction kettle at the same time, stir vigorously, control the pH value between 10-14 during the stirring process, and control the temperature of the reaction kettle at 40-70°C during the reaction process. After completion, filter, wash, and dry to obtain a hydroxide precursor uniformly doped with Mg, and there is an inert gas or nitrogen protection in the reaction kettle;

[0054] 3) Pre-sintering: pre-sintering the precursor of step...

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PUM

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Abstract

The invention discloses a positive electrode material of a multi-element layered lithium ion battery. The chemical general formula of the positive electrode material is LiNiaMbNcO2, and the Li-Ni mixed ranging degree is less than 2%; in the chemical general formula, M is a transition-metal element, N is one or more of Al, Mg, Ti and Zr, and the values of a, or b, or c meet conditions that a+b+c=1, a>0.3, and c<0.03. The preparation method is as follows: preparing a multi-element precursor by virtue of utilizing a coprecipitation method, and then performing lithiation and sintering, thereby obtaining the positive electrode material of a multi-element layered solid solution. Compared with the prior art, the positive electrode material of the multi-element layered lithium ion battery has the advantages that the Li-Ni mixed ranging degree is reduced to less than 2%, so that the positive electrode material has higher coulomb efficiency, better layer structure and stronger bond energy and shorter bond length of metal-oxygen bond and also has better cycle performance and obviously improved thermal stability at a high temperature and a high pressure.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries. More specifically, the invention relates to a multi-layered lithium ion battery cathode material suitable for high-voltage charging and discharging and a preparation method thereof. Background technique [0002] Lithium-nickel-cobalt-manganese (NCM) ternary materials have attracted extensive attention from researchers because of their high capacity (up to 250mAh / g, 91% of the theoretical capacity), excellent safety performance, and low price. The poor cycle performance under high voltage restricts its application and development in lithium-ion batteries. [0003] Since the radii of nickel ions and lithium ions are similar, during the sintering process of NCM, it is easy to cause nickel to occupy the lithium site, and Li-Ni mixing occurs (Li-Ni mixing is used to characterize the layered structure of NCM materials, and Ni enters In the Li layer, it will hinder the Li + The diffusion path of L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/505H01M4/525H01M4/628Y02E60/10
Inventor 阮丁山夏恒涛柳娜谭欣欣吴承仁
Owner DONGGUAN AMPEREX TECH
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