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Cathode materials for electricity storage device, electrode for electricity storage device and electricity storage device, and method for manufacturing them

The technology of a negative electrode material and manufacturing method, which is applied in the field of negative electrode materials for electric storage devices, can solve the problems of a large amount of lithium-containing reagents, excessive time, and damage to the material structure, and achieve the effect of improving the initial charge and discharge efficiency

Active Publication Date: 2014-06-04
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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  • Cathode materials for electricity storage device, electrode for electricity storage device and electricity storage device, and method for manufacturing them
  • Cathode materials for electricity storage device, electrode for electricity storage device and electricity storage device, and method for manufacturing them
  • Cathode materials for electricity storage device, electrode for electricity storage device and electricity storage device, and method for manufacturing them

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0199] In an argon drying box with a moisture content of 1 ppm or less, prepare a Si-based material that can be doped with lithium (a silicon oxide represented by SiOx (x = 1.02) with an average particle diameter of 5 μm is coated with 5 wt% Carbon material) 0.75g, vapor-grown carbon fiber (VGCF manufactured by Showa Denko KK) 0.1g as a conductive material, and add ethylene carbonate and γ-butyrolactone (weight ratio: 20 : 80) 0.74g of mixed solvent, 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 approximately 0.024 g of each was added to the obtained clay-like mixture, and kneaded and mixed while kneading. After the lithium metal has completely disappeared, the next lithium metal foil is added, and a total of 0.15 g of lithium metal is kneaded and mixed (equivalent to 760 mAh / g relative to the weight of the Si-based material that can be doped with lithium). After kneading and mixing, the ...

Embodiment 2～5）

[0213] In the same process as in Example 1, a mixture of ethylene carbonate and γ-butyrolactone (weight ratio: 20:80) was added to the Si-based material that can be doped with lithium and the vapor-grown carbon fiber (VGCF manufactured by Showa Denko Corporation) Solvent, use a mortar for mixing.

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

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

[0216] After confirming the X-ray diffraction pattern of the heat-treated powder obtained in this way, observe the broad peaks around 2θ=28.4°, 47.3°, and 56.1° attributable to the Si-based material that can be doped with lithium, and observe that it is attributed to Li 2 SiO 3 , Li 2 Si 2 O 5 , Li 4 SiO 4 Peak. Will belong to Li 2 SiO 3 18.9° ...

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Abstract

The invention aims to provide a cathode materials for an electricity storage device and a method for manufacturing them; the cathode materials for the electricity storage device uses Si series material with excellent primary charge-discharge efficiency and stability in the atmosphere; furthermore, the invention also provides an electricity storage device electrode containing the cathode materials and the electricity storage device, and the method for making them; the making method of the cathode material for the electricity storage device is provided; the Si series material adsorbing releasing li-ions and Li metal can be mixed in solvent; and thermo processing is carried out after the mixture so as to form lithium silicate, thereby making the cathode material with pre-doped Li.

Description

Technical field [0001] The present invention relates to a negative electrode material for an electric storage device, an electrode for an electric storage device, an electric storage device, and a method of manufacturing them. Background technique [0002] In recent years, various types of high energy related to power supplies for small portable devices such as mobile phones, mid-night power storage systems, home distributed power storage systems based on solar power generation, and power storage systems for electric vehicles are being vigorously developed in recent years. Density battery. [0003] In particular, the market for lithium ion batteries as a power source for small portable devices is rapidly expanding due to the following reasons: they have a volumetric energy density exceeding 350Wh / l; and they are safer than lithium secondary batteries that use metal lithium as a negative electrode. , Cycle characteristics and other reasons for better reliability. Lithium ion batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/13C01B33/32H01M10/0525H01M4/139H01M4/134H01M4/136H01M4/1395H01M4/1397H01M4/48
CPCY02E60/122H01M4/136H01M4/364H01M4/5825H01M10/0525C01B33/32Y02E60/10H01M4/0471H01M4/1397H01M4/622H01G11/50H01M4/625C01P2006/40C01P2004/80C01P2002/72Y02E60/13
Inventor 吉川博树
Owner SHIN ETSU CHEM IND CO LTD
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