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High-cycle lithium ion battery multi-element anode material NCM and preparation method thereof

A positive electrode material and multi-component technology, which is applied in the field of surface modification to prepare multi-component positive electrode materials, can solve problems such as poor cycle performance, fast capacity decay, and poor rate performance, so as to improve uniformity, reduce resistance and discharge potential. Good effect of difference and structural stability

Active Publication Date: 2015-12-16
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the multi-material integrated LiCoO 2 , LiNiO 2 , LiMnO 2 The advantages of two or three lithium-ion battery cathode materials, the performance of multi-component materials are better than any one of the above single-component cathode materials, there is an obvious synergistic effect, it is considered to be the most promising new cathode material, but there are also Some defects, such as poor rate performance and fast capacity fading due to poor conductivity; poor cycle performance due to electrolyte decomposition and corrosion of electrodes, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of the high-cycle lithium battery multiple positive electrode material NCM of the present invention comprises the following steps:

[0022] (1) Will Li 2 CO 3 、Ni 0.5 co 0.2 mn 0.3 (OH) 2 According to the molar ratio of Li and the transition metal element (Ni+Co+Mn) in the multi-component precursor is 1.06, add polyvinyl alcohol with a total mass of 0.1% and mix uniformly by ball milling in a dry method;

[0023] (2) After mixing, put the above materials in a ventilation volume of 0.9m 3 The sintering temperature is 900℃, the sintering time is 10h, and the sintered material is crushed, pulverized, classified, sieved and other processes to obtain LiCoO 2 Coated LiNi 0.5 co 0.2 mn 0.3 o 2 The ternary material;

[0024] (3) Add ZnO to ethanol at a mass ratio of 1:25 to ethanol, sonicate for 1 hour, add the semi-finished ternary material prepared in step (2) to the above solution, and mix them evenly by sonicating for 1 hour. ZnO and Ni 0...

Embodiment 2

[0027] (1) LiOH·H 2 O, Ni 0.6 co 0.2 mn 0.2 (OH) 2 According to the molar ratio of Li to the transition metal element (Ni+Co+Mn) in the multi-component precursor is 1.09, add 0.2% carboxymethyl cellulose by mass, and mix evenly by ball milling in a dry method.

[0028] (2) After mixing, put the above materials in a ventilation volume of 0.3m 3 Calcined in an oxygen atmosphere per hour, the sintering temperature is 880°C, and the sintering time is 8h. The sintered material is crushed, pulverized, classified, sieved and other processes to obtain LiNi 0.6 co 0.2 mn 0.2 o 2 The ternary material;

[0029] (3) Add nano-sized MgO to the water according to the mass ratio of 1:50 to deionized water, sonicate for 0.5h, add the semi-finished ternary material prepared in step (2) into the above solution, sonicate for 2h to mix Both, where the MgO and Ni 0.6 co 0.2 mn 0.2 (OH) 2 The mass ratio is 0.2%. And dry at 110°C for 8h, the mixture is ground and sintered at 500°C for 2...

Embodiment 3

[0033] (1) Will Li 2 CO 3 、Ni 0.8 co 0.1 mn 0.1 (OH) 2 According to the molar ratio of Li to the transition metal element (Ni+Co+Mn) in the multi-component precursor is 1.05, 1% of the total mass of polyethylene glycol is added, and the mixture is uniformly mixed by ball milling in a dry method.

[0034] (2) After mixing, put the above materials in a ventilation volume of 0.65m 3 The sintering temperature is 775°C, and the sintering time is 16h. The sintered material is crushed, pulverized, classified, sieved and other processes to obtain LiCoO2 coated LiNi 0.8 co 0.1 mn 0.1 o 2 The ternary material;

[0035] (3) Nanoscale ZrO 2 Add it to deionized water at a mass ratio of 1:30 into water, ultrasonicate for 1h, add the semi-finished ternary material prepared in step (2) to the above solution, and ultrasonically mix for 2h, wherein the ZrO 2 with you 0.8 co 0.1 mn 0.1 (OH) 2 The mass ratio is 0.3%. And dry at 150°C for 6h, grind the mixture and sinter at 600°C f...

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Abstract

The invention discloses a high-cycle lithium ion battery multi-element anode material NCM and a preparation method thereof. The multi-element anode material comprises a surface modified layer with the structure formula of LixNi1-y-zCoyMnzO2, wherein x is larger than or equal to 1 and smaller than or equal to 1.2, y is larger than or equal to 0 and smaller than or equal to 1 / 3, and z is larger than or equal to 0 and smaller than or equal to 1 / 3. The preparation method includes the steps of evenly mixing and sintering soluble lithium salt, multi-element precursors and dispersing agent, mixing and sintering the mixture and a wrapping material B again, and obtaining the multi-element anode material. Dispersing agent is added in the reaction process, and therefore the reaction uniformity is improved, and the oxygen defects caused in the reaction process are reduced or eliminated. By means of the prepared anode material, the structural stability of the material is improved, the difference between resistance and discharge potential of the material is reduced, the resistance and discharge potential can reach consistency on the aspect of de-intercalation of lithium ions, the structure of the material is stabilized, and the safety and electrochemical performance of the material are improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a method for adding a dispersant to improve the uniformity of the reaction and preparing a multi-component positive electrode material through surface modification treatment. Background technique [0002] In recent years, in response to the negative impacts such as environmental pollution and the sharp consumption of oil resources brought about by the rapid development of the automobile industry, countries are actively conducting research on electric vehicles (EV) and hybrid electric vehicles (HEV) using clean energy. Among them, the power battery as vehicle power has become the main bottleneck in the development of EV and HEV. As one of the core parts of lithium-ion batteries, cathode materials for lithium-ion batteries have always been the focus of research and development. Improving the performance of cathode materials is the key to improving the perfor...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525H01M2004/028H01M2220/20Y02E60/10
Inventor 常敬杭吴海燕商士波梅晶刘洪金胡泽林
Owner SOUNDON NEW ENERGY TECH CO LTD
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