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Carbonaceous electrode material for non-aqueous secondary battery

A technology of secondary batteries and electrode materials, applied in battery electrodes, secondary batteries, non-aqueous electrolyte batteries, etc., can solve problems such as poor charging characteristics and short cycle life

Inactive Publication Date: 2000-05-31
KUREHA KAGAKU KOGYO KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, batteries using lithium metal for the cathode have some difficulties, such as (1) poor charging characteristics, such as normal charging time of 5-10 hours, and (2) short cycle life, etc., especially in this battery When constituting a secondary battery

Method used

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  • Carbonaceous electrode material for non-aqueous secondary battery
  • Carbonaceous electrode material for non-aqueous secondary battery
  • Carbonaceous electrode material for non-aqueous secondary battery

Examples

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example

[0102] Hereinafter, the present invention will be described more specifically based on examples and comparative examples. All volumes and flow rates of the processing gases described below are values ​​calculated under standard conditions (0°C, 1 atm).

example 1

[0104] Bamboo pieces (about 3mm×3mm×3mm in size) and Bambusa bamboo pieces (about 3mm×3mm×3mm in size) grown in Vietnam respectively are mixed into raw materials with a weight ratio of 1:1, and heated to 500° C., and maintained at 500° C. for 5 hours in a nitrogen atmosphere (normal pressure) for preliminary calcination to produce a carbon precursor with a maximum volatile matter content of 2 wt%. The carbon precursor was ground into a weight average powdered carbon precursor having a particle size of about 25 [mu]m and having a potassium content of 0.5 wt%. Stack about 3g of powdered carbon precursor in an aluminum crucible into a layer about 1-2mm thick, then place it in a horizontal tube furnace with a diameter of 75mm and heat it to 1200°C at a rate of 5°C / min, and keep it at 1200°C Carbonization was carried out for 1 hour while blowing nitrogen gas at a rate of 5 liters / min.

[0105] The properties of the carbonaceous material thus obtained are shown in Table 1 below uni...

example 2

[0107] The powdered carbon precursor prepared in Example 1 was subjected to two cycles of deliming treatment, wherein each cycle included immersion in 35% hydrochloric acid for 1 hour and washing in boiling water for 1 hour to obtain a potassium content ≤ 0.1 wt% deashed powdered carbon precursor. The deashed powdered carbon precursor is ground again to form a powdered carbon precursor with an average particle size of 25 μm. About 3g of powdered carbon precursor was stacked in an aluminum crucible, then placed in a horizontal tube furnace with a diameter of 75mm and heated to 1100°C at a rate of 5°C / min, and kept at 1100°C for 1 hour for carbonization.

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Abstract

A carbonaceous electrode having improved capacities for doping and dedoping of a cell active substance, such as lithium, and suitable for a non-aqueous solvent secondary battery, is constituted by a carbonaceous material having a true density as measured by a butanol substitution method of at most 1.46 g / cm<3>, a true density as measured by a helium substitution method of at least 1.7 g / cm<3>, a hydrogen-to-carbon atomic ratio H / C of at most 0.15 as measured according to elementary analysis, a BET specific surface area of at most 50 m<2> / g as measured by nitrogen adsorption BET method. The carbonaceous material is advantageously produced by carbonizing an organic material originated from bamboo genera of family Gramineae, particularly genus Pleioblastus or Bambusa, at 1000-1400 DEG C. under a reduced pressure or under a flowing inert gas stream to provide an appropriate porous structure.

Description

technical field [0001] The invention relates to a carbonaceous material suitable for use as an electrode material of an anhydrous secondary battery and a production method thereof. The present invention also relates to an electrode structure comprising such a carbon-containing electrode material and a nonaqueous secondary battery having such an electrode structure. Background technique [0002] As the size of electronic devices and devices decreases, the development of batteries with higher energy density has been required, and in response to such requirements, various nonaqueous electrolyte batteries including so-called lithium batteries have been proposed. [0003] However, batteries using lithium metal for the cathode have some difficulties, such as (1) poor charging characteristics, such as normal charging time of 5-10 hours, and (2) short cycle life, etc., especially in this battery When configured as a secondary battery. These difficulties are all attributed to the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M4/133H01M4/1393H01M4/587H01M4/96H01M10/05
CPCH01M4/505H01M4/525H01M4/587H01M10/0525H01M2004/021Y02E60/122H01M4/133Y02E60/10H01M4/58
Inventor 山田心一郎井本浩东秀人妹尾直世界孝二永峰政幸小丸笃雄园部直弘增子二朗石川实
Owner KUREHA KAGAKU KOGYO KK
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