Electrode active material covered with carbonaceous material, electrode for secondary battery, and secondary battery

An electrode active material, carbonaceous material technology, applied in non-aqueous electrolyte battery electrodes, battery electrodes, circuits, etc., can solve the problems of unresearched carbon black structure, unresearched carbonaceous materials, etc., to improve the current collection effect, improve Effect of battery characteristics

Active Publication Date: 2020-07-28
ASAHI CARBON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although hydrocarbons have been studied as carbonaceous materials for carbon coating, other preferred carbonaceous materials (such as carbon black, etc.) have not been studied, and the structure of carbon black most suitable for carbon coating has not yet been studied. Wait

Method used

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  • Electrode active material covered with carbonaceous material, electrode for secondary battery, and secondary battery
  • Electrode active material covered with carbonaceous material, electrode for secondary battery, and secondary battery
  • Electrode active material covered with carbonaceous material, electrode for secondary battery, and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6、 comparative example 1～2

[0049] Using carbon black and / or polystyrene (PS: MW=2000, Wako Pure Chemical Industries, Ltd.) produced under the conditions shown in Table 1 and having the properties shown in Table 2, a carbonaceous material-covered electrode active material. Electrodes were fabricated using these electrode active materials, and these electrodes were used as positive electrodes to fabricate secondary batteries. The production sequence is described below. Table 3 shows the types of carbonaceous materials and conductive materials used, and the ratios (% by mass) of conductive materials, electrode active materials, and binders.

[0050] (Production of carbon-coated LFP (electrode active material))

[0051] LFP (LiFePO 4 ) was pre-calcined at 320°C for 5 hours in an environment of argon:hydrogen=95:5, and then dry-mixed with carbon black using a ball mill. Next, polystyrene and xylene as an organic solvent were further added and wet-mixed with a ball mill, and then xylene was evaporated. A...

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Abstract

This electrode active material is covered with a carbonaceous material. The carbonaceous material is composed of carbon black and carbon hydride. With respect to the carbon black, the ratio of the number of primary particles PPA (particles), said primary particles forming an aggregate, to the primary particle diameter d (nm), namely PPA / d is 8 or more. The carbon hydride is, for example, a polystyrene. The primary particle diameter d is, for example, 15 nm or less. This electrode active material is able to be utilized for an electrodes for secondary batteries, and a secondary battery.

Description

technical field [0001] The present invention relates to an electrode active material, an electrode for a secondary battery containing the electrode active material, and a secondary battery. Background technique [0002] In recent years, secondary batteries have been used in a wide range of applications such as electric vehicles and mobile phones. In addition, along with the expansion of applications, the requirements for the performance of secondary batteries such as high energy density, high output density, and high-speed charging and discharging are gradually increasing. Furthermore, in order to satisfy these demands, various research and development related to various materials have been carried out. One of them is research and development related to the improvement of the conductivity of electrode active materials. [0003] Generally, the electrical conductivity of a single electrode active material is low, so in addition to the electrode active material, a conductive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/36
CPCH01M4/13H01M4/36H01M4/62Y02E60/10
Inventor 佐藤峰夫冈田大山口东吾有满望
Owner ASAHI CARBON
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