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Negative electrode material for lithium ion secondary battery, method for producing same, negative electrode for lithium ion secondary battery using same, and lithium ion secondary battery

A secondary battery and negative electrode material technology, applied in the direction of secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems that the cycle characteristics of the practical level cannot be obtained, and the expansion of metal materials cannot be fully alleviated, and achieve excellent Effects of initial charge and discharge efficiency, high discharge capacity, and moderate swelling

Active Publication Date: 2017-12-22
JFE CHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for any of the above-mentioned (1) to (3), merely arranging graphite materials and carbonaceous materials around the metal material cannot sufficiently relax the expansion of the metal material during charging, and therefore cannot solve the problem. Problems such as micronization and exfoliation of active materials, the current situation is that the cycle characteristics of the practical level have not been obtained

Method used

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  • Negative electrode material for lithium ion secondary battery, method for producing same, negative electrode for lithium ion secondary battery using same, and lithium ion secondary battery
  • Negative electrode material for lithium ion secondary battery, method for producing same, negative electrode for lithium ion secondary battery using same, and lithium ion secondary battery
  • Negative electrode material for lithium ion secondary battery, method for producing same, negative electrode for lithium ion secondary battery using same, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] [Production of negative electrode material]

[0111] Scaly graphite particles with an average particle size of 5 μm and an average flatness of 20 and silicon particles with an average particle size of 0.2 μm were dispersed in an aqueous polyacrylic acid solution, and spray-dried by a spray drying device to obtain a spherical composite precursor. Next, using a planetary mixer, a tar-in-oil solution of coal tar pitch was added to the composite precursor and kneaded, and then calcined at 1000°C in an inert atmosphere of nitrogen to obtain a negative electrode as the target composite. Material. With respect to the compounding quantity of each raw material, as shown in Table 1, the respective abundance ratio in the complex which is a final product was adjusted. Spray drying was performed under the conditions shown in Table 2. The average particle diameter of the complex measured by a laser particle size distribution analyzer was 10 μm. The average aspect ratio of the comp...

Embodiment 2

[0137] Preparation of a composite, preparation of a negative electrode and an evaluation battery, and evaluation of battery characteristics were performed in the same manner as in Example 1, except that the compounding ratio when preparing the composite was adjusted as shown in Tables 1 and 2.

[0138] From the SEM image of the composite, it can be seen that the scaly graphite particles are oriented concentrically on the surface, and from the polarized light microscope image of the cross section of the composite, it can be seen that there are voids inside, and the scaly graphite particles are non-parallel to each other. . In addition, from the EDX mapping image, it can be seen that silicon particles exist dispersedly.

Embodiment 3、4

[0140] In the ratio shown in Table 1, flake graphite particles with an average particle size of 5 μm and an average flatness of 20, silicon particles with an average particle size of 0.2 μm, and graphite fibers were added to an aqueous polyacrylic acid solution and mixed. In the same manner as in Example 1, preparation of a composite, preparation of a negative electrode and an evaluation battery, and evaluation of battery characteristics were performed.

[0141] From the SEM image of the composite, it can be seen that the scaly graphite particles are oriented concentrically on the surface, and from the polarized light microscope image of the cross section of the composite, it can be seen that there are voids inside, and the scaly graphite particles are non-parallel to each other. . In addition, from the EDX mapping image, it can be seen that silicon particles exist in a dispersed manner. It can also be seen from the appearance of the composite and the SEM image of the cross s...

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Abstract

A negative electrode material for a lithium-ion secondary battery, characterized in that it is a spherical composite body composed of scaly graphite particles, calcined carbon, and metal particles that can be alloyed with lithium, the composite body has voids inside, and the above-mentioned The flaky graphite particles exist non-parallel in the interior of the composite and are concentrically oriented on the surface of the composite, and the metal particles are dispersed in the composite particles.

Description

technical field [0001] The present invention relates to the composite particle (composite particle) for lithium ion secondary battery negative electrode material that is made of flake graphite particle (flake graphite), calcined carbon (baked carbon) and the metal particle that can alloy with lithium and its production method, use A negative electrode for a lithium ion secondary battery of the composite particle, and a lithium ion secondary battery using the negative electrode. Background technique [0002] Lithium-ion secondary batteries have excellent characteristics such as high voltage and high energy density compared with other secondary batteries, and thus are widely used as power sources for electronic devices. In recent years, along with the development of miniaturization and high performance of electronic equipment, there has been an increasing desire for a further increase in energy density of lithium ion secondary batteries. [0003] At present, generally speakin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587C01B32/20H01M4/36
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/364H01M4/38H01M4/386H01M4/387H01M4/587H01M10/0525Y02E60/10H01M4/13
Inventor 时田智间所靖江口邦彦
Owner JFE CHEMICAL CORP
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