A layered oxide lithium ion battery positive electrode and preparation method thereof

A lithium-ion battery, oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of time and temperature control that are difficult to grasp, difficult to practice, and cannot be well applied, and improve cycle stability and rate. Performance, the effect of preventing side reactions

Inactive Publication Date: 2011-12-28
浙江吉能电池科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the preparation of layered compounds is carried out in an air atmosphere, it is difficult to use the conventional method of pyrolysis of organic matter to coat carbon. Therefore, there are relatively few studies on carbon coating at present. It is difficult to grasp, so that carbon coating cannot be well applied to the positive electrode material of layered oxide lithium ion battery, and it is even more difficult to be used in practice.

Method used

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  • A layered oxide lithium ion battery positive electrode and preparation method thereof
  • A layered oxide lithium ion battery positive electrode and preparation method thereof
  • A layered oxide lithium ion battery positive electrode and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0032] Weigh Mn according to the mass ratio of 4.873:1:0.5 1 / 3 Ni 1 / 3 co 1 / 3 (OH) 2 Precursors, manganese sulfate monohydrate and lithium hydroxide monohydrate, will press Mn 1 / 3 Ni 1 / 3 co 1 / 3 (OH) 2 Ammonia water (NH 4 OH) to make a 300ml solution. Mn to be weighed 1 / 3 Ni 1 / 3 co 1 / 3 (OH) 2 The precursor is mixed with the ammonia solution to form a suspension. Add the suspension into the reaction vessel, and stir at a high speed of 600 r / min with a mechanical stirring device. The reactor was heated to 50 °C.

[0033] The weighed manganese sulfate monohydrate and lithium hydroxide monohydrate were respectively dissolved in deionized water to prepare solutions with concentrations of 1mol / L and 2mol / L. At the same time, an equal volume of ammonia solution was prepared according to the ratio of manganese ions to ammonium ions in the manganese sulfate solution at a ratio of 1:1. Finally, the prepared manganese sulfate solution, lithium hydroxide solution and ammonia ...

Embodiment 2

[0039] Weigh Mn according to stoichiometric ratio 1:1.02 1 / 3 Ni 1 / 3 co 1 / 3 (OH) 2 Precursor and lithium hydroxide monohydrate, the two are fully mixed, and calcined in a high-temperature furnace at 800 ° C for 8 hours in an air atmosphere to obtain a layered oxide Li 1.02 mn 1 / 3 Ni 1 / 3 co 1 / 3 o 2.02 .

[0040] Li obtained in the above steps 1.02 mn 1 / 3 Ni 1 / 3 co 1 / 3 o 2.02 The positive electrode material, conductive carbon black, and PVDF were uniformly mixed in a mass ratio of 95:3:2, a certain amount of NMP was added, and stirred for 4 hours to form a slurry. The prepared slurry was evenly coated on the surface of the aluminum foil, and the prepared electrode film was dried in a vacuum oven at 70° C. for 12 hours. The completely dried pole piece is then compacted with a roller press under a pressure of 20MPa.

[0041] Finally, put the prepared pole piece into the magnetron sputtering equipment, use high-purity graphite target as the carbon source, and evacuate ...

Embodiment 3

[0044] Weigh Ni(CH 3 COO) 2 4H 2 O, Mn(CH 3 COO) 2 4H 2 O and NaOH, will press Ni(CH 3 COO) 2 4H 2 O, Mn(CH 3 COO) 2 4H 2 O was dissolved in deionized water to make a 1mol / L solution, and 1mol / L ammonia water (NH 4 OH) solution, the sodium hydroxide that weighs is made into the solution of 2mol / L. Ammonia water and sodium hydroxide are used as regulators, and 300ml of deionized water is taken as the bottom solution to adjust the pH to 11. Add the bottom liquid into the reaction vessel, and use a mechanical stirring device to stir at a high speed of 600r / min, and at the same time, heat the reactor to 50°C. Finally, the prepared Ni(CH 3 COO) 2 4H 2 O and Mn(CH 3 COO) 2 4H 2 O mixed solution, sodium hydroxide solution and ammonia solution were simultaneously fed into the reaction vessel at a feed rate of 100 μL / min for reaction. Ni was obtained after about 15 hours 0.6 mn 0.4 (OH) 2Precursor. The precursor was filtered and washed repeatedly with deionized w...

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Abstract

The invention relates to a positive electrode of a layered oxide lithium ion battery and a preparation method thereof. The positive electrode includes a pole piece and a carbon layer on the pole piece. The carbon layer is formed by magnetron sputtering under an inert atmosphere using a graphite target The carbon source is formed by sputtering on the surface of the pole piece. The present invention uses the magnetron sputtering method to coat the positive electrode with carbon, which breaks through the limitation of the traditional thermal decomposition method to coat the positive electrode material, and prepares the positive electrode of the carbon-coated lithium-rich layered structure oxide lithium ion battery. By using the carbon layer The effect of effectively preventing the side reaction between the active material and the electrolyte during the charging and discharging process improves the cycle stability and rate performance of the positive electrode of the layered lithium-rich lithium-ion battery. Experiments have found that it can meet the requirements of power lithium-ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a positive electrode of a layered oxide lithium-ion battery and a preparation method thereof. Background technique [0002] LiCoO is the main positive electrode material used in commercially produced lithium-ion batteries. 2 , LiCoO 2 It has high capacity and good stability, but this kind of positive electrode material has a great impact on the environment, and the price of cobalt is expensive and the cost is high. Although the theoretical capacity of lithium cobalt oxide is 274mAh / g, it is not stable in charging and discharging. Only about half of the capacity (about 140mAh / g) is released during the process. Therefore, people also try to develop other lithium-ion battery cathode materials, such as layered LiNiO 2 and LiMnO 2 , LiMn with spinel structure 2 o 4 . Although the cost of these materials is greatly reduced, the positive trivalent single-pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/1391
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 张立军吕焕祥施少君谷长栋涂江平张文魁
Owner 浙江吉能电池科技有限公司
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