Graphite particles for lithium ion secondary battery negative electrode materials, lithium ion secondary battery negative electrode and lithium ion secondary battery

A secondary battery and negative electrode material technology, applied in the direction of secondary batteries, battery electrodes, graphite, etc., can solve problems such as insufficient fast charging, low initial charge and discharge efficiency, and insufficient discharge capacity, and achieve excellent initial charge and discharge efficiency Effect

Active Publication Date: 2017-08-18
JFE CHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The discharge capacity per unit mass of the negative electrode material using the graphite composite mixed powder described in Patent Document

Method used

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  • Graphite particles for lithium ion secondary battery negative electrode materials, lithium ion secondary battery negative electrode and lithium ion secondary battery
  • Graphite particles for lithium ion secondary battery negative electrode materials, lithium ion secondary battery negative electrode and lithium ion secondary battery
  • Graphite particles for lithium ion secondary battery negative electrode materials, lithium ion secondary battery negative electrode and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0138] [Preparation of spheroidized graphitic particles (A)]

[0139] Flake natural graphite with an average particle diameter of 55 μm was pulverized, and folded while being rotated, shaped into a spherical shape, adjusted to an average particle diameter of 12 μm, and an average aspect ratio of 1.4, (d 002 ) is 0.3357nm, specific surface area is 7.0m 2 / g, and the volume of pores with a pore diameter of 0.5 μm or less obtained by mercury porosimetry is 0.12 ml / g.

[0140] Using a molding machine at 0.5 tons / cm 2 The pressure of this spherical graphitic particle is carried out compression treatment, is adjusted to be 12 μ m in average particle diameter, and average aspect ratio is 1.8, (d 002 ) is 0.3357nm, specific surface area is 6.5m 2 / g, and the volume of pores with a pore diameter of 0.5 μm or less obtained by mercury porosimetry is 0.08ml / g.

[0141] [Preparation of Composite Graphite Particles (C1)]

[0142] With 100 parts by mass of the above-mentioned spheroidiz...

Embodiment 2～5

[0184] In Example 1, the mixing ratio of the composite graphite particles (C1) and the composite graphite particles (C2) was changed. In addition, the pressurized pressure was changed in the same manner as in Example 1, and the density of the negative electrode mixture layer was adjusted to 1.75. g / cm 3 , making the working electrode and making the evaluation cell. The same charge and discharge test as in Example 1 was performed, and the evaluation results of battery characteristics are shown in Table 1.

Embodiment 6

[0189] In Example 1, the density of the negative electrode mixture layer was changed to 1.80g / cm 3 (Example 6) Except for this, a working electrode was produced in the same manner as in Example 1, and an evaluation cell was produced. The same charge and discharge test as in Example 1 was performed, and the evaluation results of battery characteristics are shown in Table 1.

[0190] The more you increase the density of the negative electrode mixture layer, the more the characteristics of each battery tend to decrease, but at a density of 1.80g / cm 3 maintained at a sufficiently high standard. On the other hand, if the density is increased too much, the deformation of the copper foil serving as the current collector and the decrease in battery characteristics will become significant.

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Abstract

Provided are: a negative electrode material which has at least one of excellent initial charge/discharge efficiency, excellent high-rate charge characteristics, excellent high-rate discharge characteristics and excellent long-term cycle characteristics; a negative electrode which uses this negative electrode material; and a lithium secondary battery. Graphite particles for lithium ion secondary battery negative electrode materials, which are a mixture of composite graphite particles (C1) that comprise carbonaceous material (B1) within spheroidized graphite particles (A) having spherical or generally spherical shapes and/or on at least a part of the surfaces of the spheroidized graphite particles (A) and composite graphite particles (C2) that have a graphite material (B2) within the spheroidized graphite particles (A) having spherical or generally spherical shapes and/or on at least a part of the surfaces of the spheroidized graphite particles (A). In this connection, the mixture satisfies the following requirements (1)-(5). (1) The interplanar spacing (d002) of a carbon network surface layer is 0.3360 nm or less. (2) The tap density is 1.0 g/cm<3> or more. (3) The average particle diameter is 5-25 [mu]m. (4) The average aspect ratio is 1.2 or more but less than 4.0. (5) The pore volume of pores having a diameter of 0.5 [mu]m or less as determined by means of a mercury porosimeter is 0.08 ml/g or less.

Description

technical field [0001] The invention relates to a lithium ion secondary battery negative pole material, a lithium ion secondary battery negative pole containing the negative pole material and a lithium ion secondary battery using the negative pole. Background technique [0002] In recent years, along with miniaturization and high performance of electronic devices, there has been an increasing desire to increase the energy density of batteries. In particular, lithium-ion secondary batteries are attracting attention because they can achieve a higher voltage than other secondary batteries and can achieve high energy density. A lithium ion secondary battery has a negative electrode, a positive electrode, and an electrolytic solution (non-aqueous electrolyte) as main components. [0003] The anode generally consists of a current collector including copper foil and an anode material (working substance for the anode) bonded with a binder. Generally, carbon materials are used as n...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/133H01M10/0525C01B32/205
CPCH01M4/36H01M4/587C01B32/21Y02E60/10H01M4/364H01M10/0525H01M4/133
Inventor 江口邦彦间所靖高木嘉则
Owner JFE CHEMICAL CORP
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