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Modified manganese-based layered material, preparation method thereof, and lithium-ion battery containing the material

A basic and modified technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor material cycle at room temperature and high temperature, changes in material surface composition and structure, restricting the commercial application of materials, etc., to improve electron transport. Speed, short transmission path, good batch stability

Active Publication Date: 2017-02-08
NEC (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that the prior art has at least the following problems: this manganese-based layered material has relatively prominent problems, such as: (1) the rate performance of the material needs to be improved; (2) due to the stable surface of the material When it is eroded by the electrolyte, it is easy to oxidize with the electrolyte, resulting in changes in the surface composition and structure of the material, resulting in poor cycle performance at room temperature and high temperature, which seriously affects the life of the battery; (3) The first charge and discharge of the material less efficient
The above problems seriously restrict the commercial application of this material

Method used

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  • Modified manganese-based layered material, preparation method thereof, and lithium-ion battery containing the material
  • Modified manganese-based layered material, preparation method thereof, and lithium-ion battery containing the material
  • Modified manganese-based layered material, preparation method thereof, and lithium-ion battery containing the material

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Embodiment 1

[0031] An embodiment of the present invention provides a method for preparing a modified manganese-based matrix material, the preparation method comprising:

[0032] Dissolve an appropriate amount of soluble lithium source compound, soluble phosphorus source compound, soluble manganese source compound, acidic complexing agent, and soluble sugar in deionized water and stir for 1-10 hours to make a sol, in which lithium, manganese, and phosphorus are three elements The molar ratio is 0.95-1:1:1, the molar ratio of phosphorus element to the manganese-based matrix material to be modified is 0.05-0.30:1, the pH value of the sol solution is 4-6, and the mass of carbon element in soluble sugars 1-30% of the mass of the manganese-based matrix material to be modified;

[0033] Adding the manganese-based matrix material to be modified into the prepared sol, stirring and mixing, heating while stirring until the sol evaporates to dryness, and obtaining a modified manganese-based matrix ma...

Embodiment 2

[0050] Add 4.2g of lithium hydroxide, 13.2g of diammonium hydrogen phosphate, and 24.5g of manganese acetate into a beaker, add 200ml of deionized water, add citric acid to adjust the pH value to pH=5, add 26.7g of glucose and stir for 5 hours to make a sol;

[0051] 106.7g manganese-based layered material 0.5Li 2 MnO 3 0.5LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Add it into the sol, continue stirring and mixing for 10 hours, then stir while heating in a water bath, until the sol is completely evaporated to dryness, and obtain the precursor of the modified manganese-based matrix material;

[0052] Put the above-mentioned modified manganese-based matrix material precursor into an oven and dry at 120°C for 4 hours, take it out and pass through a 200-mesh sieve, put the undersieve into a muffle furnace, and bake it at 300°C under nitrogen protection 4h, then increase the temperature and roast at 750°C for 16h, then cool down to room temperature, take out the material cooled to room temper...

Embodiment 3

[0054] Add 4.2g of lithium hydroxide, 13.2g of diammonium hydrogen phosphate, and 24.5g of manganese acetate into a beaker, add 200ml of deionized water, add citric acid to adjust the pH value to pH=5, add 26.7g of glucose and stir for 5 hours to make a sol ;

[0055] 213.4g manganese-based layered material 0.5Li 2 MnO 3 0.5LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Add it into the sol, continue to stir for 10 hours, and then stir while heating in a water bath until the sol is completely evaporated to dryness to obtain a modified manganese-based matrix material precursor;

[0056] Put the above-mentioned modified manganese-based matrix material precursor into an oven and dry at 120°C for 4 hours, take it out and pass through a 200-mesh sieve, put the undersieve into a muffle furnace, and bake it at 300°C under nitrogen protection 4h, then increase the temperature and roast at 750°C for 16h, then cool down to room temperature, take out the material cooled to room temperature and pass thr...

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Abstract

The invention discloses a preparation method of a modified manganese-based stratified material. The preparation method comprises the steps of dissolving a lithium source, a phosphorus source, a manganese source, an acid complexing agent and sugar in deionized water, stirring for 1-10h to prepare the solution into collosol, adding a to-be-modified manganese-based stratified material to the prepared collosol, stirring and mixing the collosol, then simultaneously heating and stirring the collosol until the collosol is evaporated to dryness, obtaining a modified manganese-based stratified material precursor, drying, roasting and sieving the modified manganese-based stratified material precursor, and obtaining an undersize product, namely the modified manganese-based stratified material, wherein a mole ratio of lithium to manganese to phosphorus is (0.95-1):1:1; a mole ratio of phosphorus to the to-be-modified manganese-based stratified material is (0.05-0.30):1; a pH (Potential of Hydrogen) value of a solution is 4-6; and the mass of carbon in the sugar is 1-30% of that of the to-be-modified manganese-based stratified material. The rate capability, the room temperature cycle performance, the high temperature cycle performance, the first efficiency and the like of a battery prepared by the modified manganese-based stratified material are improved to a certain extent.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a modified manganese-based layered material used for a positive electrode of a lithium-ion battery, a preparation method thereof, and a lithium-ion battery using the material. Background technique [0002] The energy issue is a key issue related to the sustainable development of our country. Seeking and developing alternative new energy is an important national policy of our country at present. Lithium-ion battery is a kind of high-energy battery that has developed rapidly in the past ten years. Due to its advantages of high voltage, high specific energy, long cycle period, and low environmental pollution, it has become a key direction for the development of my country's new energy industry. . [0003] Cathode material is an important part of lithium-ion batteries, and it is also the part with the highest cost ratio in lithium-ion batteries. Lithium cobalt oxide is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/58H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M4/5825H01M4/628H01M10/0525Y02E60/10
Inventor 郭建黄庆华李鹏
Owner NEC (CHINA) CO LTD
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