Negative electrode material for lithium-ion batteries and use therefor

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of inability to obtain capacity, increase in internal resistance, large expansion rate and shrinkage rate, etc., and achieve excellent charge-discharge cycle characteristics , Excellent initial efficiency and large discharge capacity

Active Publication Date: 2018-02-16
株式会社力森诺科 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, negative electrode materials such as Si have large expansion and contraction rates associated with the intercalation and deintercalation (storage and release) of lithium ions.
Therefore, there is a gap between the particles and the expected capacity cannot be obtained.
In addition, the particles are pulverized and micronized by repeating large expansion and contraction, so the electrical contact is divided and the internal resistance increases, so the resulting lithium-ion battery has a short charge-discharge cycle life

Method used

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  • Negative electrode material for lithium-ion batteries and use therefor
  • Negative electrode material for lithium-ion batteries and use therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0209] Crude oil produced in Liaoning Province, China (API28, wax content 17% by mass, sulfur content 0.66% by mass) was distilled at atmospheric pressure, and the heavy fraction was distilled at 510°C under normal pressure using a sufficient amount of Y-type zeolite catalyst. Bed catalytic cracking. The solid components such as the catalyst are centrifuged until the obtained oil becomes clear to obtain a clarified oil. The oil is fed to a small delayed coking process. The drum inlet temperature is 505°C, and the internal pressure of the drum is maintained at 600kPa (6kgf / cm 2 ) After 10 hours, carry out water cooling to obtain black block. The obtained black mass was pulverized with a hammer so that the maximum size was about 5 cm, and then dried in a kiln at 200°C. Let this be coke 1.

[0210] This coke 1 was pulverized with a Bantam mill manufactured by Hosokawa Micron Corporation, and thereafter, the coarse powder was cut using a sieve having a hole diameter of 45 μm. ...

Embodiment 2

[0217] The coke 1 described in Example 1 was pulverized with a Bantam mill manufactured by Hosokawa Micron Corporation, and then the coarse powder was cut using a sieve with a hole diameter of 45 μm. The pulverized coke 1 was further pulverized with a jet mill manufactured by SEISHIN ENTERPRISEC Co., Ltd. Next, airflow classification was performed with a turbo classifier TC-15N manufactured by Nisshin Engineering, to obtain powdered coke 2 (D50=12.0 μm) substantially free of particles with a particle diameter of 1.0 μm or less.

[0218] The powdered coke 2 was filled in a graphite crucible, and heat-treated in an Acheson furnace for one week so that the highest temperature reached about 3300° C., to obtain non-flaky artificial graphite particles (B2). At this time, the graphite crucible is provided with a plurality of ventilation holes. Table 1 shows various physical properties of the obtained non-flaky artificial graphite particles (B2). D50 is 12.2μm, BET specific surface ...

Embodiment 3

[0222] The powdered coke 2 described in Example 2 was filled into a graphite crucible, and heat-treated for one week so that the maximum temperature in the Acheson furnace became about 3300° C., to obtain non-flaky artificial graphite particles (B3) . Table 1 shows various physical properties of the obtained non-flaky artificial graphite particles (B3). D50 is 12.2μm, BET specific surface area is 1.0m 2 / g, d002 is 0.3357nm, Lc is 108nm, total pore volume is 5.0μL / g, average circularity is 0.89, orientation I 110 / I 004 is 0.11.

[0223] Thereafter, a composite material (3) was obtained in the same manner as in Example 1, except that the artificial graphite particles (B3) were used instead of the artificial graphite particles (B1) in Example 1.

[0224] Table 2 shows the results of evaluating the powder physical properties and battery characteristics of this composite material (3).

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Abstract

This negative electrode material has a high discharge capacity per unit mass and excellent initial efficiency. By using the negative electrode material, it is possible to provide a high-capacity lithium-ion battery with excellent charge-discharge cycle characteristics. The present invention pertains to a negative electrode material for lithium-ion batteries that includes silicon-containing particles, artificial graphite particles, and a carbonaceous material. At least a portion of the silicon-containing particles, artificial graphite particles, and carbonaceous material are combined together into composite particles. The silicon-containing particles have a SiOx layer (0 < x <= 2) on the particle surface and an oxygen content of 1.0 mass% to 18.0 mass% inclusive, with particles having a primary particle diameter of 200 nm or smaller as the main component thereof. The artificial graphite particles are non-scale-shaped particles and have a D50 particle diameter of 1.0 mum to 15.0 mum inclusive, D50 being the particle diameter at 50% of a volume-based cumulative size distribution measured by laser diffractometry. The present invention also pertains to a lithium-ion battery provided with a negative electrode using the negative electrode material.

Description

technical field [0001] The invention relates to negative electrode materials for lithium ion batteries and uses thereof. More specifically, the present invention relates to: a negative electrode material capable of obtaining a lithium ion battery having a large charge-discharge capacity and excellent charge-discharge cycle characteristics, a paste containing the negative electrode material, a negative electrode sheet coated with the paste, and a negative electrode sheet having the Negative plate of lithium-ion battery. Background technique [0002] Since the multifunctionalization of mobile electronic devices is advancing faster than the reduction in power consumption of electronic components, the power consumption of mobile electronic devices has increased. Therefore, there has been a strong demand for higher capacity and miniaturization of lithium-ion batteries, which are main power sources of mobile electronic devices, than ever before. In addition, with the development...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587C01B32/205C01B32/05C01B33/02H01M4/133H01M4/36H01M4/38H01M4/48
CPCC01B33/18C01P2002/74C01P2002/78C01P2004/51C01P2004/62C01P2006/12C01P2006/14C01P2006/16C01P2006/40C01B33/02H01M4/133H01M4/134H01M4/364H01M4/366H01M4/386H01M4/485H01M4/587H01M10/0525H01M2004/021Y02E60/10H01M4/131C01B32/205H01M4/483H01M2004/028
Inventor 石井伸晃武藤有弘大塚康成武内正隆迪尔克·万格奈希滕斯特金·普特
Owner 株式会社力森诺科
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