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A kind of modified material of positive electrode of lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and modified materials, which is applied in the field of modified materials for lithium-ion batteries and its preparation, can solve problems such as unsuitable for high-current charging and discharging, difficulty in finding high-voltage electrolytes, and poor conductivity of materials. Achieve the effect of significant production practice significance, excellent rate discharge, and large discharge specific capacity

Active Publication Date: 2016-05-11
TIANJIN JUYUAN NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The material requires a higher charging voltage, and it is difficult to find a matching high-voltage electrolyte;
[0006] (2) The electrical conductivity of the material is poor, so it is not suitable for high current charging and discharging

Method used

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  • A kind of modified material of positive electrode of lithium ion battery and preparation method thereof
  • A kind of modified material of positive electrode of lithium ion battery and preparation method thereof
  • A kind of modified material of positive electrode of lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment example 1

[0037] Preparation of Li-ion battery positive electrode matrix material Li[Li 0.17 Ni 0.17 co 0.10 mn 0.56 ]O 2 , the specific steps are:

[0038] (1) Weigh the transition metal nickel, cobalt, and manganese with a molar ratio of 0.21:0.12:0.67, and dissolve them in deionized water to make a solution. The concentration of metal elements in the solution is 2mol / L;

[0039] (2) Add the solution prepared in step (1) into a 5L capacity reactor, and stir it at a stirring speed of 400rpm, and adjust the temperature of the reactor water bath to 55°C; use a peristaltic machine to add carbonate to the reactor In, and adjust the pH of the solution between 7.5-7.7;

[0040](3) Filter the solution in the reactor in step (2), take the precipitated part and wash it with deionized water, and then dry it in air at 100°C for 12 hours;

[0041] (4) Weigh an appropriate amount of lithium source according to the stoichiometric formula and mix with the above-mentioned dried precipitated subs...

Embodiment example 2

[0046] A preparation method of a positive electrode modified material for a lithium ion battery, characterized in that it comprises the following steps:

[0047] The first step is to prepare the lithium-ion battery positive electrode matrix material Li[Li 0.17 Ni 0.17 co 0.10 mn 0.56 ]O 2 ;

[0048] The second step is to weigh a certain amount of Pr(NO) 3 ·6H 2 O, and dissolve it in 200mL deionized water to prepare 1mol / L Pr(NO) 3 solution, and the solution was added to the 1L reactor;

[0049] In the third step, weigh the matrix material Li[Li[Li] prepared in the first step 0.17 Ni 0.17 co 0.10 mn 0.56 ]O 2 , add it to the reaction kettle in the second step and stir, keep the stirring speed at 400rpm, and adjust the temperature of the water bath in the reaction kettle to 60°C; after continuous stirring for 1h, use a peristaltic machine to add 60% ammonia water to the reaction kettle to adjust the solution The pH is between 9-10;

[0050] The fourth step, after r...

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Abstract

The invention discloses a modified material of a lithium ion battery anode, and a preparation method of the modified material. The material of the lithium ion battery anode is coated with praseodymium oxide with a mass fraction of 3-7%, and a chemical formula of the modified material of the lithium ion battery anode coated with praseodymium oxide is Li1.170.83O2 / Pr6O11. Compared with the prior art, the modified material of the anode is higher in discharge specific capacity, excellent in multiplying power discharge and better in cycling performance, facilitates popularizing an application of a lithium-enriched material in reality, and has an important production practice significance.

Description

technical field [0001] The invention relates to the technical field, in particular to a modified material for a positive electrode of a lithium ion battery and a preparation method thereof. Background technique [0002] After years of development, lithium-ion batteries have many advantages such as high voltage, high energy density, long cycle life, small self-discharge, no memory effect, wide operating temperature range, and no pollution. They are recognized by the international community as the most ideal chemical power source. It has been widely used in national life and national defense construction, such as mobile communication equipment, laptop computers, portable electric tools and weapons and equipment. With the development of a new generation of smart electronic products, higher requirements are placed on the energy density, power density, safety and cost of ion batteries. [0003] Argonne Laboratories of the United States publicly reported a lithium-rich manganese-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/505H01M4/525
CPCH01M4/48H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 孟海星金慧芬高俊奎步绍宁徐圣钊
Owner TIANJIN JUYUAN NEW ENERGY TECH CO LTD
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