Negative electrode material for electricity storage device, electrode for electricity storage device, electricity storage device, and their manufacturing method

A manufacturing method and negative electrode material technology, applied in the direction of non-aqueous electrolyte battery electrodes, battery electrodes, electrical components, etc., can solve the problems of a large number of lithium-containing reagents, damage to the material structure, and long time, and achieve the effect of improving the initial charge and discharge efficiency

Active Publication Date: 2018-06-01
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems as follows: In this case, it takes a lot of time to uniformly dope the entire body; also, the metal lithium installed in the battery remains without complete pre-doping, or the lithium part that disappears due to pre-doping The formation of gaps affects the internal resistance of the battery, etc.
In addition, it also includes the following problems that must be solved in manufacturing: when using a collector with through holes, it is necessary to coat the electrode on the collector with open holes; although the method of attaching lithium metal foil to the electrode containing the active material is uniform High reliability, but thickness accuracy, processing, etc. of ultra-thin lithium metal foil below 0.03mm are required
[0014] In addition, as long as the active material is impregnated into a solution of alkyllithium dissolved in an organic solvent such as hexane, and the active material is directly pre-doped, uniform pre-doping can be achieved, but it is different from using lithium metal as the lithium source. Compared with the situation, a large amount of lithium-containing reagents are required, and after the reaction, it is necessary to take out the active material and separate the remaining reagents, etc., which requires a very cumbersome process
In addition, the doping by the two-chamber (Tow-Bulb) method (gas phase) and the mechanical alloying method (solid phase) have the following fatal problems: the conditions are complicated; a special and large-scale device is required; and pre-doping The material will destroy the material structure due to exposure to high temperature or crushing caused by too violent force, so it is difficult to be used in practical applications

Method used

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  • Negative electrode material for electricity storage device, electrode for electricity storage device, electricity storage device, and their manufacturing method
  • Negative electrode material for electricity storage device, electrode for electricity storage device, electricity storage device, and their manufacturing method
  • Negative electrode material for electricity storage device, electrode for electricity storage device, electricity storage device, and their manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0199] In an argon drying oven with moisture below 1ppm, prepare a Si-based material that can be doped with lithium (a silicon oxide represented by SiOx (x=1.02) with an average particle size of 5 μm is coated with 5% by weight (wt) % Carbon material) 0.75g, Vapor-grown carbon fiber (VGCF manufactured by Showa Denko K.K.) 0.1g As a conductive material, ethylene carbonate and γ-butyrolactone (weight ratio: 20 :80) of mixed solvent 0.74g, and mixed with a mortar.

[0200] A lithium metal foil with a thickness of 0.03 mm was cut into a square with a side length of 10 mm, and about 0.024 g was added to the obtained clay-like mixture, and kneaded and mixed while kneading. After the lithium metal completely disappeared, the next lithium metal foil was added, and a total of 0.15 g of lithium metal was kneaded and mixed (corresponding to 760 mAh / g relative to the weight of the Si-based material that can be doped with lithium). After the kneading and mixing were completed, the added l...

Embodiment 2～5）

[0213] In the same procedure as in Example 1, a mixture of ethylene carbonate and γ-butyrolactone (weight ratio: 20:80) was added to Si-based materials that can be doped with lithium and vapor-grown carbon fibers (VGCF manufactured by Showa Denko Co., Ltd.) Solvents, mixed using a mortar.

[0214] A 0.03 mm lithium metal foil was cut into a square with a side length of 10 mm, about 0.024 g was added to the obtained clay-like mixture, and kneaded and mixed while kneading.

[0215] This mixture was heat-treated at various temperatures (Example 2: 200°C, Example 3: 400°C, Example 4: 600°C, Example 5: 1300°C) for 5 hours.

[0216] After confirming the X-ray diffraction pattern of the heat-treated powder obtained in this way, broad peaks around 2θ=28.4°, 47.3°, and 56.1° attributed to the Si-based material that can be doped with lithium were observed, and it was observed that the peaks attributed to Li 2 SiO 3 , Li 2 Si 2 o 5 , Li 4 SiO 4 Peak. will belong to Li 2 SiO 3 1...

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Abstract

An object of the present invention is to provide an anode material for an electrical storage device using a Si-based material excellent in initial charge-discharge efficiency and stability in the atmosphere, and a method for producing the anode material. In addition, an electrode for an electrical storage device including such a negative electrode material, an electrical storage device, and methods for producing them are also provided. The present invention provides a method for producing negative electrode materials for electrical storage devices. In the presence of a solvent, a Si-based material capable of absorbing and releasing lithium ions and lithium metal are kneaded and mixed, and heat treatment is performed after the kneading and mixing. To form lithium silicate, so as to make pre-doped lithium negative electrode material.

Description

technical field [0001] The present invention relates to negative electrode materials for electrical storage devices, electrodes for electrical storage devices, electrical storage devices, and methods for producing them. Background technique [0002] In recent years, various high-energy products related to power supplies for small portable devices represented by mobile phones, late-night power storage systems, distributed power storage systems for households based on solar power generation, and power storage systems for electric vehicles have been vigorously developed. density battery. [0003] In particular, the market for lithium ion batteries as power sources for small portable devices is rapidly expanding due to the following reasons: having a volumetric energy density exceeding 350 Wh / l; and being safer than lithium secondary batteries using metal lithium as a negative electrode , cycle characteristics and other reasons for better reliability. Li-ion battery, using LiC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/13C01B33/32H01M10/0525
Inventor 吉川博树
Owner SHIN ETSU CHEM IND CO LTD
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