High-nickel material coated with Li2TiO3 on surface and doped with Ti on surface layer and preparation method

A surface-coated, high-nickel technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of high-nickel material deterioration of cycle performance and safety performance, increased impedance, and increased electrochemical engineering energy consumption. Achieve the effect of improving electrochemical performance and structural stability

Active Publication Date: 2017-06-30
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the cycle performance and safety performance of high-nickel materials gradually deteriorate with the increase of nickel content
The above problems largely limit the large-scale application of high-nickel cathode materials in lithium-ion power batteries
[0003] The traditional means of improving high-nickel cathode materials is mainly to inhibit the direct contact between the electrolyte and the cathode material by forming an inert coating layer on the surface. Although the electrochemical stability is improved to a certain extent, it will also increase the impedance at the same time, thereby increasing the Energy Consumption in Electrochemical Engineering

Method used

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  • High-nickel material coated with Li2TiO3 on surface and doped with Ti on surface layer and preparation method
  • High-nickel material coated with Li2TiO3 on surface and doped with Ti on surface layer and preparation method
  • High-nickel material coated with Li2TiO3 on surface and doped with Ti on surface layer and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Step 1. Take by weighing 47.313g NiSO in the ratio of molar ratio Ni:Co=0.9:0.1 4 ·6H 2 O, 5.622gCoSO 4 ·7H 2 O soluble inorganic salts are made into nickel and cobalt ion total concentration is 2mol L with 100mL deionized water -119.2g NaOH and 32.3mL ammonia water are mixed with deionized water according to the molar ratio of 1.5 so that the NaOH molar concentration is 0.4mol L -1 Mix the alkaline solution.

[0039] Step 2. Use 100mL deionized water as the reaction base solution, start stirring and heating to stabilize the temperature at 45°C, continue stirring and temperature until the end of the reaction, the stirring rate is 600r / min, add ammonia water to adjust the pH to about 11.5. Slowly and uniformly introduce the mixed salt solution and mixed alkali solution into the reaction kettle, and control the pH to be stable at about 11.5 during introduction. The feeding time is 24h, and the stirring is continued for 24h after the feeding is finished. After the re...

Embodiment 2

[0045] Step 1. Take by weighing 47.313g NiSO in the ratio of molar ratio Ni:Co=0.9:0.1 4 ·6H 2 O, 5.622gCoSO 4 ·7H 2 O soluble inorganic salts are made into 2mol L with 100mL deionized water -1 19.2g NaOH and 32.3mL ammonia water are mixed with deionized water according to the molar ratio of 1.5 so that the NaOH molar concentration is 0.4mol L -1 Mix the alkaline solution.

[0046] Step 2. Use 100mL deionized water as the reaction base solution, start stirring and heating to stabilize the temperature at 55°C, continue stirring and temperature until the end of the reaction, the stirring rate is 600r / min, add ammonia water to adjust the pH to about 11.5. Slowly and uniformly introduce the mixed salt solution and the mixed alkali solution into the reaction kettle, and control the pH to be stable at 11.5 during introduction. The feeding time is 24h, and the stirring is continued for 18h after the feeding is finished. After the reaction is completed, the precipitate is filter...

Embodiment 3

[0052] Step 1. Take by weighing 47.313g NiSO in the ratio of molar ratio Ni:Co=0.9:0.1 4 ·6H 2 O, 5.622gCoSO 4 ·7H 2 O soluble inorganic salts are made into 2mol L with 100mL deionized water -1 mixed salt solution, and then use deionized water to prepare NaOH and ammonia water according to the molar ratio of 1.5 to make the NaOH molar concentration 0.4mol L -1 Mix the alkaline solution.

[0053] Step 2. Use 100mL deionized water as the reaction base solution, start stirring and heating to stabilize the temperature at 65°C, the stirring rate is 600r / min, add 3-5 drops of ammonia water to adjust the pH to about 11.5. Slowly and uniformly introduce the mixed salt solution and the mixed alkali solution into the reaction kettle, and control the pH to be stable at 11.5 during introduction. The feeding time is 24h, and the stirring is continued for 12h after the feeding is finished. After the reaction is completed, the precipitate is filtered, washed, and dried to obtain a high...

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Abstract

The invention relates to a high-nickel material coated with Li2TiO3 on the surface and doped with Ti on the surface layer and a preparation method and belongs to the field of chemical energy storage batteries. The material is prepared from, in percentage by total mass, 0.1%-10% of Ti in the surface coating layer Li2TiO3, 0.1%-10% of Ti doped on the surface layer and the balance of a high-nickel material, the thickness of the surface coating Li2TiO3 is 0.01-5 nm, and the surface layer refers to the layer from the surface of the high-nickel material to the depth smaller than or equal to 1 mu m. According to the method, NI-Co hydroxide is prepared with a hydroxide coprecipitation method, a TiO2 layer is formed on the surface of the material through hydrolysis of tetrabutyl titanate, the Li2TiO3 coating layer is formed on the surface after lithium mixing, meanwhile, the surface is doped with Ti, and the Li2TiO3 coating and Ti cooperate to improve the electrochemical performance and structural stability of the high-nickel material.

Description

technical field [0001] The invention relates to a surface coated Li 2 TiO 3 And the high-nickel material and preparation method of surface layer doping Ti, specifically relate to a kind of utilizing Li 2 TiO 3 The invention discloses a method for improving the performance of a high-nickel material through the synergistic effect of surface coating and surface layer Ti doping, and belongs to the field of chemical energy storage batteries. Background technique [0002] In recent years, my country's new energy automobile industry has developed vigorously, and the power battery market has a broad space. At present, lithium iron phosphate battery is still the main power battery, but its specific energy is limited, and it will be difficult to meet the needs of passenger vehicles in terms of cruising range in the future. Therefore, the pursuit of high specific energy is an important research and development direction of lithium-ion power batteries. For LiNiO 2 The layered oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/52H01M10/0525
CPCH01M4/366H01M4/485H01M4/523H01M10/0525Y02E60/10
Inventor 苏岳锋刘娜田君陈来卢赟包丽颖吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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