Lithium-ion battery cathode material and preparation method thereof

A technology for lithium-ion batteries and cathode materials, which is applied in the field of sheet-like nanostructure lithium-ion battery cathode materials and its preparation, can solve problems such as limiting the development and application of lithium manganate, destroying lithium ion transmission channels, and affecting structural stability. Achieve the effects of low implementation cost, environmental friendliness and easy industrialization

Active Publication Date: 2015-12-23
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the dissolution of manganese ions, electrolyte corrosion, and Jahn-Teller effect affecting the structural stability of spinel-type lithium manganese oxide, its lithium ion transport channel is damaged, the capacity decays quickly, and the cycle performance deteriorates, which limits the ability of manganese. Development and Application of Lithium Oxide as Cathode Material for Lithium-ion Batteries

Method used

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  • Lithium-ion battery cathode material and preparation method thereof
  • Lithium-ion battery cathode material and preparation method thereof
  • Lithium-ion battery cathode material and preparation method thereof

Examples

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preparation example Construction

[0016] The technical solution provides a method for preparing a positive electrode material of a lithium-ion battery, comprising the steps of:

[0017] In the first step, according to the stoichiometric ratio, the high-valent manganese salt, the low-valent manganese salt and the oxidizing agent are sequentially dissolved in deionized water, stirred and mixed uniformly to obtain a mixed solution.

[0018] In this step, the stoichiometric ratio is related to the specific materials of the high-valent manganese salt, low-valent manganese salt and oxidizing agent, that is, according to the various materials actually used, the high-valent manganese salt, the low-valent manganese salt and the oxidizing agent are reacted to generate The ratio of the chemical reaction equation when manganese dioxide is used to calculate the amount of high-valent manganese salt, low-valent manganese salt and oxidant. The high-valent manganese salt is permanganate or permanganate water and crystals. Hig...

Embodiment 1

[0033] Dissolve 5.26 grams (g) of potassium permanganate, 0.56 g of manganese sulfate and an appropriate amount of ammonium persulfate into 100 milliliters (mL) of deionized water and stir for 30 minutes (min); pour the resulting dark purple mixture into polytetrafluoroethylene In the prepared hydrothermal tank, seal it with a stainless steel tube and put it into an explosion-proof oven; set the parameters of the explosion-proof oven to 100 degrees Celsius (°C) and keep it warm for 48 hours (h); after the reaction is completed, filter and wash the obtained slurry with deionized water several times ; Put the product in an oven and dry it, and control the drying temperature to 80°C to obtain δ-MnO 2 Powder. Mix lithium hydroxide and manganese dioxide nanosheets into anhydrous acetone according to the stoichiometric ratio, and stir evenly; dry the resulting mixture at room temperature to obtain a powder; place the powder in a vacuum tube furnace Sintering at 400°C for 10 hours; ...

Embodiment 2

[0035]Dissolve 5.26g of potassium permanganate, 0.56g of manganese sulfate and an appropriate amount of ammonium persulfate in 100mL of deionized water and stir for 30 minutes; pour the obtained dark purple mixture into a hydrothermal tank made of polytetrafluoroethylene, and seal it with a stainless steel tube Then put it into an explosion-proof oven; set the parameters of the explosion-proof oven to 130 ° C for 72 hours; after the reaction is completed, filter and wash the obtained slurry with deionized water several times; put the product in an oven to dry, and control the drying temperature to 80 ° C. Get δ-MnO 2 Powder. Mix lithium hydroxide and manganese dioxide nanosheets into anhydrous acetone according to the stoichiometric ratio, and stir evenly; dry the resulting mixture at room temperature to obtain a powder; place the powder in a vacuum tube furnace Sintering at 500°C for 15 hours; the product was washed with deionized water, filtered and dried to obtain the corr...

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Abstract

The invention relates to a preparation method of a positive pole material of a lithium ion battery. The preparation method comprises the following steps of: dissolving a high-valence manganese salt, a low-valence manganese salt and an oxidant in deionized water according to the stoichiometric ratio, stirring and uniformly mixing to get a mixed solution; performing hydrothermal reaction on the mixed solution to get slurry; filtering, washing and drying the slurry to get a delta-MnO2 nano-sheet material; uniformly mixing a lithium salt and the delta-MnO2 nano-sheet material according to the stoichiometric ratio to get a mixture; putting the mixture into an organic solvent, uniformly stirring, and then drying at room temperature to get powder; sintering the powder in an oxidizing atmosphere, washing, drying and grinding to get the positive pole material of the lithium ion battery. The invention further provides the positive pole material of the lithium ion battery. The positive pole material of the lithium ion battery, provided by the invention, has the characteristic of good cycling performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a sheet-like nanostructure lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] With the development of human beings, the energy crisis and environmental problems have become increasingly prominent, and new energy storage devices have attracted people's attention. In recent years, lithium-ion batteries have gradually occupied the main market of energy storage devices due to their advantages such as high specific energy, light weight, and environmental friendliness. As the original component for storing lithium ions in lithium-ion batteries, the cathode material plays an important role in the performance of lithium-ion batteries. Therefore, the development of cathode materials with excellent electrochemical performance has become one of the important means to improve the overall performance of lithium-ion batte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505C01G45/12B82Y30/00
CPCY02E60/10
Inventor 康飞宇孙一歌李宝华徐成俊魏春光贺艳兵杜鸿达
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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