Positive pole material of lithium ion battery and preparation method thereof

A lithium ion battery and cathode material technology, which is applied in the field of sheet nanostructured lithium ion battery cathode materials and their preparation, can solve the problems of restricting the development and application of lithium manganate, destroying lithium ion transport channels, affecting structural stability, and the like. Achieve the effect of low implementation cost, environmental friendliness and easy industrialization

Active Publication Date: 2013-10-02
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
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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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  • Positive pole material of lithium ion battery and preparation method thereof
  • Positive pole material of lithium ion battery and preparation method thereof
  • Positive pole material of lithium ion battery and preparation method thereof

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preparation example Construction

[0016] This technical solution provides a method for preparing a lithium ion battery cathode material, which includes the steps:

[0017] In the first step, according to the stoichiometric ratio, the high-valence manganese salt, the low-valence manganese salt and the oxidant are dissolved in deionized water 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 oxidant used, that is, according to the various materials actually used, the high-valent manganese salt, low-valent manganese salt and the oxidant react to form The chemical reaction equation ratio of 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. The permanganate can be specifically lithium permanganate, sodium permanganate, pota...

Embodiment 1

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

Embodiment 2

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

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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 nanostructured lithium ion battery anode material and a preparation method thereof. Background technique [0002] With the development of mankind, energy crises and environmental problems have become increasingly prominent, and new energy storage devices have received people's attention. In recent years, lithium-ion batteries have gradually occupied the main market of energy storage devices due to their high specific energy, light weight, and environmental friendliness. As an element for storing lithium ions in a lithium ion battery, the cathode material plays an important role in the performance of the lithium ion battery. Therefore, the development of positive electrode materials with excellent electrochemical performance has become one of the important means to improve the overall performance of lithium-ion batteries. [0003] Currently, the catho...

Claims

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Application Information

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Patent Type & Authority Applications(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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