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Negative electrode material for lithium-ion battery, and use therefor

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of interrupted conduction path, increase in internal resistance, large volume change, etc., and achieve large discharge capacity and high charge-discharge efficiency. , the effect of large charge and discharge capacity

Active Publication Date: 2016-12-14
UMCORE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity of particles containing Si and Sn is originally low, and the volume change is large with the intercalation and deintercalation of lithium ions. Therefore, the particles are crushed and the conductive path is interrupted, resulting in an increase in internal resistance.

Method used

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  • Negative electrode material for lithium-ion battery, and use therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0147] Petroleum-based coke was pulverized and heat-treated in an Acheson furnace at 3000°C to obtain a particle size of 10% (D 10 ) is 7.8μm, and the BET specific surface area is 1.9m 2 / g of scaly graphitic carbon material particles.

[0148] Silicon-containing particles (D av : 50nm; Oxygen content: 5.8% by mass; True density (theoretical value): 2.33g / cm 3 ) 10 parts by mass and 20 parts by mass of petroleum pitch (softening point: 93° C.; carbon residue rate: 28%) [based on the mass after the carbonization of petroleum pitch] were put into a detachable flask. The inert atmosphere was maintained by flowing nitrogen gas, and the temperature was raised to 150°C. The dispersion was rotated and stirred at 1000 rpm to uniformly mix the bitumen and silicon-containing particles. It was cooled and solidified to give mixture (a).

[0149] The mixture (a) was pulverized in a nitrogen atmosphere using a rod mill to obtain a pulverized product (a).

[0150] 50 parts by mass of t...

Embodiment 2

[0154] A composite material (b) was obtained in the same manner as in Example 1 except that the pulverization of the mixture (a) was performed with a rotary shredder instead of a rod mill.

[0155] For the composite material (b), the XPS-Si2p peak area ratio (A / B), oxygen content, specific surface area and D 10 . In addition, half cells and full cells were produced using the composite material (b), and the initial efficiency, charge and discharge efficiency, discharge capacity, and discharge capacity maintenance rate were measured. The results are shown in Table 1.

Embodiment 3

[0157] A composite material (c) was obtained in the same manner as in Example 1 except that the pulverized product (a) and the graphite carbon material particles were mixed with a rod mill instead of a rotary shredder.

[0158] For the composite material (c), the XPS-Si2p peak area ratio (A / B), oxygen content, specific surface area and D 10 . In addition, the composite material (c) was used to manufacture half cells and full cells, and the initial efficiency, charge and discharge efficiency, discharge capacity and discharge capacity maintenance rate were measured. The results are shown in Table 1.

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Abstract

A negative electrode material for lithium-ion batteries that comprises a composite material that includes silicon-containing particles, graphite carbonaceous material particles, and a carbon carbonaceous material. Upon observation of the composite material by XPS measurement, the ratio (A / B) of the area (A) of the peak derived from metallic Si near 100eV relative to the area (B) of the peak derived from silicon oxide near 103eV is 0.10-2.30. A lithium-ion battery can be obtained using said 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 initial charge-discharge efficiency and charge-discharge capacity and excellent charge-discharge cycle characteristics, a paste containing the negative electrode material, and a molded body containing the paste. Negative electrode and lithium ion battery with the negative electrode. Background technique [0002] Graphite is generally used as a negative electrode material for lithium-ion batteries. The theoretical capacity of graphite is 372mAh / g. The theoretical capacity of Si and Sn is higher than that of graphite. Therefore, if Si and Sn can be used as negative electrode materials, high-capacity lithium-ion batteries can be provided. However, the conductivity of particles containing Si and Sn is originally low, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/133H01M4/134H01M4/48
CPCH01M4/587H01M4/386H01M4/133H01M4/58H01M4/624H01M10/0525H01M4/364H01M2004/021Y02E60/10H01M4/362H01M4/366H01M4/36H01M4/38H01M4/621H01M2004/027
Inventor 大塚康成村田浩一
Owner UMCORE
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