CA2391884C - Process for the production of graphite powders of increased bulk density - Google Patents

Process for the production of graphite powders of increased bulk density Download PDF

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CA2391884C
CA2391884C CA002391884A CA2391884A CA2391884C CA 2391884 C CA2391884 C CA 2391884C CA 002391884 A CA002391884 A CA 002391884A CA 2391884 A CA2391884 A CA 2391884A CA 2391884 C CA2391884 C CA 2391884C
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graphite
powder
density
graphite powder
surface treatment
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CA2391884A1 (en
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Michael Spahr
Davide Cattaneo
Klaus Streb
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Imerys Graphite and Carbon Switzerland SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
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    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/44—Carbon
    • C09C1/46—Graphite
    • H—ELECTRICITY
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    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
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    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
    • H—ELECTRICITY
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    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • H—ELECTRICITY
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    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0204—Non-porous and characterised by the material
    • H01M8/0213—Gas-impermeable carbon-containing materials
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Abstract

The invention relates to a method for increasing the Scott density of synthetic and/or natural graphite powders of any particle size distribution, preferably of highly-pure graphite, by subjecting the graphite powder to an autogenous surface treatment. The inventive powder is used, in particular, for producing dispersions, coatings with an increased graphite/binder ratio and increased electric and thermal conductivity, gas and liquid-tight coatings on metal substrates, thermoplastic or duroplastic graphite-polymer composites, or for producing metallic, non-ferrous sintering materials.

Description

Process for the production of rag nhite powders of increased bulk densitv Field of the Invention The present invention relates to a process for the production of graphite powders of increased bulk density. The present invention relates in particular to an autogenous surface treatment of any pulverulent graphite materials, their bulk density and tamped density being markedly increased and other important material properties being advantageously modified as a result of the mutual physical-mechanical action of the individual powder particles.
Background of the Invention Graphite materials, especially those with a high graphite content, are known per se and are used in industry in a variety of ways. High-purity graphitic carbons have xylene densities (also called single-crystal densities or real densities) ranging from 1.80 to 2.27 g.cm"3 and a crystal structure which can be characterized by a c/2 value of 0.3354 to 0.3360 nm and an L. value of more than 40 nm (Lc > 40 nm). These materials are obtained from natural sources, enriched and purified or produced synthetically from amorphous carbon products in a high temperature process. Subsequent grinding processes produce pulverulent materials with different mean particle sizes in each case. A given particle size for a powder is normally always a mean value of a specific particle size distribution. The particle size distribution to be used for a particular purpose depends especially on the composition of the graphitic material and the associated properties, as well as on the intended use.

The particle shape is always platelet-like, the anisotropy of the particles being the more pronounced the higher the xylene density and Lc values. The Scott density (also referred to as bulk density) of such materials, for example with particle sizes smaller than 100 micron (particle size < 100 m, determined by laser diffraction analysis), is normally below 0.25 g.cm 3, the Scott density being lower the smaller the particle size. Comminution of the particles by grinding generally results in a lowering of the Scott density. The Scott density can be somewhat increased by an optimized particle size distribution. Thus, for example, Scott densities up to max. 0.3 g.cm'3 are achieved by an optimized composition of fine and coarse fractions for such materials with particle sizes below 100 micron.

The tamped density, the compressibility and the absorption capacity for polymeric binder materials and liquids such as oils, and for organic solvents and aqueous systems, are equally important properties of graphite powders. These properties correlate with the composition of the graphite powders and especially with the particle size distribution.
It has now been found that, surprisingly, the values of the Scott density for a particular graphite powder of any particle size distribution is considerably increased when the graphite powder is subjected to an autogenous surface treatment in which the particles impact with one another at an appropriate speed and for a sufficient length of time.

The impacts and the associated mutual physical-mechanical action change the structure or surface of the graphite particle in such a way as to result in a considerable increase in the Scott density. The other properties mentioned above are also modified to a considerable extent.

Under the electron microscope, the crude, ground, platelet-like graphite particle has an irregular shape and sharp edges. The irregular particle contours are abraded and the edges rounded off by the treatment according to the invention. If the energy dose is appropriately optimized, the grinding effect which occurs with other mechanical treatments, leading to a noticeable lowering of the bulk density, is considerably reduced or minimized. Although the abrasion of the particles creates dust, which, together with a minimal grinding effect, leads to a slight reduction in particle size and Scott density (bulk density), this particle size effect is far outweighed by the surprisingly large total increase in Scott density, and the change in the other properties, caused by the treatment according to the invention. The present invention can be at least partly explained by th observed changes in the particle contours, but the invention is not bound to this explanation.

2a Summary of the Invention According to an aspect of the present invention, there is provided a process for increasing the Scott density of a starting graphite powder of any particle size distribution, the starting graphite powder being a synthetic or natural graphitic carbon which has a high graphite content in the particle, comprising subjecting the starting graphite powder to an autogenous surface treatment in which the individual graphite powder particles are allowed to impact with one another at a measured speed so that their surface structure changes, while retaining graphite particle shape in the absence of a grinding effect occurring and wherein the autogenous surface treatment is carried out until the Scott density or the tamped density of the starting graphite powder has increased by at least 10% to 100%.

The process of autogenous surface treatment consists of allowing the individual powder particles to impact with one another at a measured speed so that, as a result of the associated mutual physical-mechanical action of the individual particles, their surface structure changes but the individual particle remains substantially unbroken, i.e. no substantial grinding effect occurs. This change in the particle contour or surface structure of the individual particle gives rise to the increase in Scott density according to the invention. The autogenous surface treatment is carried out, and the individual particles are allowed to act on one another, until the desired Scott density is achieved. The measured speed means that the speed or energy with which the individual particles are charged is adjusted so that the particles do not disintegrate on impact or collision, thereby practically avoiding a grinding effect. This adjustment is a question of process optimization and does not present a problem to those skilled in the art.

The Scott density achievable by means of the optimized grinding effect for a graphite powder of any particle size distribution can be increased in each case by at least about 10% to about 100%, preferably by about 20% to 80%, by the autogenous surface treatment according to the invention. Hitherto unattained Scott densities of 0.45 g/cm3 or more are thus achieved for graphitic materials.

The tamped density achievable by means of the optimized grinding effect for a graphite powder of any particle size distribution can also be increased by at least about 10% to 100%, preferably by about 20% to 80%, by the process according to the invention. Hitherto unattained tamped densities of at least 0.90 g/cm3 are thus achieved for graphite powders.

In the case of particle sizes of <100 m, the autogenous surface treatment according to the invention is preferably carried out by fluidizing or dispersing the graphite powder particles in an inert carrier gas and accelerating the particles with the aid of the carrier gas, as described below. The intensity of this treatment is determined by the carbon type and the mass of the particles, their speed and the amount of material used per treatment, i.e. the concentration of the fluidized particles dispersed in the gas. The intensity of the treatment increases with the softness of the graphitic carbon used, the mass of the particles, their speed and the amount used. For particle sizes of <300 m, the dispersion and acceleration of the particles are preferably effected by means of rotating mechanical tools, for example in the present process by means of a turbine or directly by means of a rotating disk.
However, the grinding effect which occurs also increases simultaneously with increasing intensity of the treatment. Thus, to achieve the maximum bulk density of a material, there is a maximum intensity which results from the optimized parameters of particle speed, particle mass and amount used. The formation of agglomerates due to the agglutination of smaller particles, which would also lead to a sustained increase in the Scott density, has not been observed. Treated particles larger than the untreated particles used did not appear in any of the experiments performed. Analyses of the treated materials by scanning electron microscopy also showed no such agglomeration.

The treatment according to the invention not only increases the Scott density but also improves the compressibility properties of the graphite powders and reduces their absorption capacity for polymeric binder materials and liquids such as oils, organic solvents and aqueous systems. The crystallinity of the graphitic carbon particles, on the other hand, remains unaffected by the mechanical surface treatment. The structural parameters and the xylene density also remain unchanged compared with the untreated particles.
The process according to the invention also increases the pressed density achievable by the optimized grinding effect for a graphite powder of any particle size distribution by at least about 0.5% to 10%, preferably by about 1% to 8%.
If the powders treated according to the invention are used to produce mouldings by compression under a pressure of 2.5 to/cm2, markedly higher pressed densities can be achieved compared with the untreated materials.

Furthermore, the powders treated according to the invention exhibit a markedly reduced oil absorption capacity and binder uptake ranging from about 10% to 50%
and especially from an average of about 20% to 45%, values in excess of 50%
also being obtainable. This effect is achieved by the treatment according to the invention because the porosity (pore structure) of the particles is not affected by the treatment, as can be demonstrated by the fact that the nitrogen adsorption properties and xylene densities hardly change.

Said markedly reduced absorption properties also result in markedly lower viscosities of dispersions of the graphite powders treated according to the invention in liquid media, so dispersions with a correspondingly increased solids content can be prepared with the graphite powders treated according to the invention. The 5 solids content of liquid carbon dispersions can be increased by more than 5%
to over 30% by using graphite powders treated according to the invention.

Graphite powders suitable for the use according to the invention are especially those with a high graphite content in the particle, and particularly so-called high-purity graphites, preferably with xylene densities ranging from 1.80 to 2.27 g.cm' and a crystal structure characterized by a c/2 value of 0.3354 to 0.3360 nm and an Lc value of more than 40 nm (L, > 40 nm). The powders can be obtained from natural sources or prepared synthetically from amorphous carbon products and can have any mean particle size and particle size distribution. Preferred pulverulent graphitic materials are those with a mean particle size of up to 150 gm, preferably of 1 m to 50 m, and especially high-purity pulverulent graphites. Such graphites are known per se.

The process according to the invention is preferably carried out in such a way that the graphite powder particles to be treated are dispersed and fluidized in a gas.
This can be done using any method of fluidization technology known per se in which the particles impact with one another in the fluidized state and thereby change their surface contours and surface structures, as is the case e.g. in a fluidized bed. However, to carry out the process according to the invention, the fluidized particles are preferably provided with higher speeds so that the particles fluidized in this way are accelerated with higher energies. Preferably, the fluidized particles are continuously concentrated and diluted again in the gaseous environment. The resulting collisions between the particles set in rotation, and the friction between them, result in surface abrasion of the particles, the energy transferred to the particles being adjusted so that the collisions and friction cause substantially no disintegration of the particles.

The process according to the invention can be put into optimum effect e.g. in the device shown in Figure 1. This device consists specifically of a circular disk with radial impact pins flush-mounted on the rim, said disk being sheathed by a cylindrical treatment chamber closed to the outside (turbine with associated turbine effect). The dimensions of the cylindrical treatment chamber are adjusted so that it encloses the disk and can allow some space between its inner wall and the rotating disk. The disk is connected to a motor, located outside the treatment chamber, by means of a shaft through the wall of the treatment chamber and can be set in rotation by this motor. The cylindrical treatment chamber is provided with a radial aperture (hole). An additional aperture is provided in the cylinder jacket of the treatment chamber, perpendicular to the disk and disk axis. These two apertures are connected by a tube located outside the treatment chamber. Thus a tube running outside the treatment chamber and attached to the wall of the treatment chamber connects the periphery of the treatment chamber to its centre. The gas (fluid) containing the fluidized particles, accelerated centrifugally by the rotating disk, circulates through this external treatment tube, exiting through the tube at the periphery of the treatment chamber as a result of the centrifugal force and flowing back through the other end of this tube into the centre of the treatment chamber, where it is accelerated again. The particles of material are accelerated by the impact pins of the rotating disk and driven away in a peripheral direction by the centrifugal forces produced by the high-speed rotor. The particles dispersed and accelerated into the gas in this way circulate in the machine along the inside of the cylinder jacket. The particles reaching the inlet of the circulation tube enter the tube and return to the treatment chamber in the region of the centre of the machine.
This results in a continuous concentration and dilution of the particles in the surrounding gaseous medium. A fraction of the treated particles is continuously fed into or withdrawn from an attached tube, but the process can also be carried out as a batch process.

The graphite powders treated according to the invention can advantageously be used as pigments in aqueous or solvent-based dispersions, thereby achieving higher solids contents than with untreated powders. The viscosity of liquid dispersions of materials treated according to the invention is markedly lower for the same solids content. Also, when dispersions according to the invention are applied to substrates and dried, coatings with markedly lower porosity values are obtained because the content of liquid phase is markedly lower. The higher solids content also means that smaller binder/carbon ratios are needed to stabilize a dried carbon coating on a substrate. The low polymeric binder contents result in a marked increase in the electrical and thermal conductivities of such carbon layers.

Dispersions containing mixtures of synthetic and/or natural graphitic carbons treated according to the invention and a polymeric binder in an aqueous or solvent-based medium can be applied to metal foils and dried to give stable coatings (for thicknesses of 10 to 5000 m) with an increased graphite/binder ratio and hence also increased electrical and thermal conductivities. The porosities of the dried films are normally below 50% and are thus appreciably lower than those of films formed of conventional graphites. Such dispersions can therefore advantageously also be used for gas-tight and liquid-tight coatings on metal substrates, which can be used as electrically conducting anticorrosive films on metal foils and plates.

The dried coatings formed by the graphites treated according to the invention can be compressed by a calender without the graphite film delaminating from the metal foil. This delamination from the metal foil is frequently observed with untreated graphites. The calendering of graphite fihns produced from graphite powders treated according to the invention affords coatings with porosities below 30%
without altering the texture or particle structure of the graphite powders used.
Such film coatings on metal foils, characterized by porosities below 30% and stabilized with lower binder/carbon ratios, can be used in lithium ion batteries as negative electrodes with charge densities above 550 Ah/1. The current-carrying capacity of such electrodes is markedly higher than that of electrodes made of conventional graphite powders. Such negative electrodes can thus be used very advantageously for lithium ion cells with a high power density.

The high packing density of the synthetic or natural graphites treated according to the invention, combined with the relatively low polymeric binder absorption capacity, is advantageous in the production of graphite/polymer composites which can be compressed to gas-tight graphite plates of high electrical conductivity. Such plates are adva_ntageously used a.c bipolar plates in polymer e_ectro_yte fuel cell technology.
Mixtures of polymers with synthetic or natural graphites or graphitic carbons treated according to the invention form thermoplastic or thermosetting composites with a higher proportion of carbon filler and a lower processing viscosity.
Thermoplastic polymer/graphite composite materials with graphites treated according to the invention have higher (and hence improved) values in respect of their isotropic, mechanical, thermal and electrical properties and behave more isotropically than composites with untreated graphitic carbons.

Metallic non-ferrous sintered materials which have been produced with synthetic or natural graphitic carbons treated according to the invention, or contain such carbons, have improved isotropic, mechanical and tribologlical properties.

The Examples which follow describe the invention.
Detailed Description of the Invention Examples 1 to 5 show the material properties of various graphites before and after the autogenous surface treatment according to the invention. The experiments were performed in the device described in the above section. The rotating disk used had a periphery of 0.75 m and a speed of rotation of 4800 rpm.

Examples 1 to 5 were carried out under the experimental conditions given in Table 1.
Table 1 Example Type of Amount used Treatment time Speed of graphite rotating disk 1 TIMREX 150 g 5 min 4800 rpm KS-graphite 2 TIMREX 150 g 5 min 4200 rpm SLX-graphite 3 TIlVIREX 150 g 5 min 4800 rpm SLM-graphite 4 TIMREX 200 g 5 min 4800 rpm SFG-graphite TIIVIREX 200 g 7 min 4800 rpm NP-graphite 6 TIMREX 200 g 5 mm 4800 rpm TIMREX KS-graphite = TIMREX KS 5-25 from TIMCAL AG
TIMREX SLX-graphite = TIMREX SLX 50 from TIMCAL AG
5 TIlVIREX SLM-graphite = TIIVIltEX SLM 44 from TIMCAL AG
TIMREX SFG-graphite = TIlVIREX SFG 44 from TIMCAL AG
TIMREX NP-graphite = TIIVIREX NP 44 from TIMCAL AG

Examples 1 to 5 show a marked increase in Scott density (bulk density) and tamped density for the powders treated according to the invention. The treated powders exhibited no agglomerates whatsoever. The resulting change in particle size distribution is indicative of a small grinding effect. The slight lowering of d values, however, is caused especially by the dust produced by the abrasion of the particles. The pore structure of the treated particles is not affected by the surface treatment. It is assumed that the dust produced by the treatment and the slight decrease in particle size distribution are the main reason for the slight lowering of the L, values and the xylene densities. The elastic recovery of the compressed treated materials drops sharply. The pressed density of mouldings produced from the treated materials under a pressure of 2.5 to/cmZ increases sharply.
Although the BET values are increased somewhat, the oil absorption and binder absorption of the particles treated according to the invention decrease markedly.
Dispersions of treated carbon particles in liquid media exhibit markedly lower viscosities than dispersions of untreated carbon particles. The solids content of liquid carbon dispersions can be increased by more than 5% by using carbon particles according to the invention. The electrical resistance of the carbons treated according to the invention increases. The changes in surface contours of the individual particles which result from the treatment of powders according to the invention can be r clearly seen from scanning electron micrographs.

i~~~3erim.ental section The particle size distribution of the materials was determined by laser diffraction analysis using a MALVERN Mastersizer. The structural parameters were obtained 10 from X-ray diffraction experiments based on the CuK,,,I line. The crystallographic cell constant in the c direction (c/2) was determined from the relative position of the (002) or (004) diffraction reflex. The maximum height of the single-crystal domains in a particle in the crystallographic c direction, L, and the resulting number of ideally stacked graphite planes were obtained from the (002) or (004) diffraction reflex according to the model of Scherrer and Jones (P. Scherrer, Gottinger Nachrichten 2 (1918) p. 98; F.W. Jones, Proc. Roy. Soc. (London) 166 A
(1938) p. 16). The xylene density was determined according to DIN 51 901.
Determination of the Scott density was based on ASTM B 329. The tamped density was determined according. to AKK-19. The specific surface areas were determined by the method of Brunauer, Emmett and Teller using a Micromeritics ASAP 2010. To determine the elastic recovery, the material was placed under a pressure of 0.5 to/cm2. The recovery was obtained from the height of the moulding with and without applied pressure and is given in percent. The electrical resistance was measured according to DIN 51 911 using a moulding produced under a pressure of 2.5 to/cm2. The pressed density of this moulding is also given.
The oil absorption was measured on the basis of DIN ISO 787 with initial weights of 0.5 g of material and 1.5 g of oil. The mixture was centrifuged in a Sigma 6-10 centrifuge for 90 min at a speed of 1500 rpm.
Example 1 TIMREX KS synthetic graphite TIMREX KS synthetic graphite Untreated After treatment Particle size Particle size d,o = 7.0 micron d,o = 5.9 micron d$o = 15.2 micron dso = 13.5 micron d90 = 30.2 micron d90 = 27.4 micron L.(002)/Lc(004) Lc(002)/L,(004) 120 nm/68 nm 101 nm/64 nm c/2 (002)/c/2 (004) c/2 (002)/c/2 (004) 0.3355 nm/0.3355 nm 0.3355 nm/0.3355 nm Xylene density Xylene density 2.254 g.cm-' 2.248 g.cm-' Scott density Scott density 0.23 g.cm' 0.30 g.cm' Tamped density Tamped density 0.539 g.cm 3 0.674 g.cm 3 BET specific surface area BET specific surface area 8.6 mZ.g' 9.3 m2.g"' Elastic recovery Elastic recovery 17% 12.3%
Electrical resistance Electrical resistance 1.911 mS2.cm 2.085 mS2.cm Oil absorption Oil absorption 113.5% 1.3% 64.3% 0.2%

Pressed density (2.5 to/cmZ) Pressed density (2.5 to/crn2) 1.863 g.cm-' 1.957 g.cm 3 Example 2 TIMREX SLX synthetic graphite TIMREX SLX synthetic graphite Untreated After treatment Particle size Particle size d,o = 11.6 micron djo = 7.4 micron dsa = 27.3 micron d50 = 20.4 micron d90 = 52.5 micron d90 = 40.8 micron L~(002)/L,(004) L~(002)/Lr ,(004) >500 nm/232 nm 368 nm/158 nm c/2 (002)/c/2 (004) c/2 (002)/c/2 (004) 0.3354 nm/0.3354 nm 0.3354 nm/0.3354 nm Xylene density Xylene density 2.261 g.em' 2.258 g.cm 3 Scott density Scott density 0.30 g.cni3 0.38 g.cm3 Tamped density Tamped density 0.641 g.cm 3 0.778 g.cm 3 BET specific surface area BET specific surface area 4.0 mz.g' 5.9 mz g' Elastic recovery Elastic recovery 7.7% 4.6%
Electrical resistance Electrical resistance 0.986 mS2.cm 1.166 mS2.cm Oil absorption Oil absorption 94.7% 11.9% 73.3% 1.9%

Pressed density (2.5 to/cmZ) Pressed density (2.5 to/cmz) 2.036 g.cm 3 2.051 g.em 3 Example 3 TIMREX SLM synthetic graphite TIMREX SLM synthetic graphite Untreated After treatment Particle size Particle size d,o = 7.3 micron dlo = 4.3 micron d5Q = 23.2 micron dso =13.9 micron d90 = 49.4 micron d90 = 35.0 micron ,(004) L,,(002)/L~(004) L~(002)/L, 241 nm/139 nm 196 nm/116 nm c/2 (002)/c/2 (004) c/2 (002)/c/2 (004) 0.3354 nm/0.3354 nm 0.3354 nm/0.3354 nm Xylene density Xylene density 2.254 g.cm 3 2.252 g.cm 3 Scott density Scott density 0.19 g.cm 3 0.34 g.cm 3 Tamped density Tamped density 0.408 g.cm"' 0.738 g.cm 3 BET specific surface area BET specific surface area 4.9m2.g' 7.7mzg' Elastic recovery Elastic recovery 14.0% 8.6%
Electrical resistance Electrical resistance 1.278 mQ.cm 1.741 mS2.cm Oil absorption Oil absorption 109.5% 2.7% 75.0% 5.3%

Pressed density (2.5 to/cmz) Pressed density (2.5 to/cmz) 1.930 g.cm 3 2.036 g.cm 3 Example 4 TIMREX SFG synthetic graphite TIMREX SFG synthetic graphite Untreated After treatment Particle size Particle size d,o = 7.5 micron d,a = 4.4 micron d50 = 24.1 micron dso = 15.0 micron d90 = 49.2 micron d90 = 35.5 micron L~(002)/L~(004) L,(002)/L,(004) 320 nm/138 nm 283 nm/199 nm c/2 (002)/c/2 (004) c/2 (002)/c/2 (004) 0.3354 nm/0.3354 nm 0.3354 nm/0.3354 nm Xylene density Xylene density 2.262 g.cm 3 2.258 g.cm 3 Scott density Scott density 0.20 g.cm 3 0.36 g.cm 3 Tamped density Tamped density 0.420 g.cm 3 0.766 g.cm' BET specific surface area BET specific surface area 5.9 m2.g"' 7.4 mZ.g' Elastic recovery Elastic recovery 9.2% 5.6%
Electrical resistance Electrical resistance 0.925 mQ.cm 0.986 mS2.cm Oil absorption Oil absorption 110.2% 6.4% 81.8% 6.9%
Pressed density (2.5 to/cmz) Pressed density (2.5 to/cmZ) 2.005 g.cm-3 2."v36 g.ctr-3 Example 5 TIMREX NP purified natural graphite TIlVIREX NP purified natural graphite Untreated After treatment Particle size Particle size d,o = 6.6 micron d,a = 3.7 micron dso = 23.0 micron d50 = 13.8 micron d90 = 49.5 micron d, = 36.9 micron ,(004) L(002)/L~(004) L,(002)/L, 364 nm/166 nm 255 nm/103 nm c/2 (002)/c/2 (004) c/2 (002)/c/2 (004) 0.3354 nm/0.3354 nm 0.3354 nrn/0.3354 nm Xylene density Xylene density 2.263 g.cm 3 2.258 g.cm 3 Scott density Scott density 0.24 g.cnf3 0.42 g.em"3 Tamped density Tamped density 0.495 g.cm 3 0.862 g.cm' BET specific surface area BET specific surface area 5.0 mZ.g"` 7.9 m2.g' Elastic recovery Elastic recovery 4.9% 3.8%
Electrical resistance Electrical resistance 0.910 mS2.cm 1.359 mS2.cm Oil absorption Oil absorption 107.2% 3.6% 58.9% 0.6%

Pressed density (2.5 to/cm2) Pressed density (2.5 to/cm) 2.066 g.cm 3 2.064 g.clTl Example 6 TIMREX KS purified natural graphite TIMREX KS purified natural graphite Untreated After treatment Particle size Particle size d,o = 8.3 micron d,o = 3.1 micron d50 = 3 8.4 micron dsa = 3 8.4 micron d90 = 68.4 micron d90 = 68.4 micron ,(004) Lc(002)/Lc(004) L,,(002)/L, 142 nm/62 nm 105 nm/52 nm c/2 (002)/c/2 (004) c/2 (002)/c/2 (004) 0.3355 nm/0.3355 nm 0.3356 nm/0.3356 nm Xylene density Xylene density 2.227 g.cm 3 2.225 g.cm"3 Scott density Scott density 0.44 g.cm 3 0.46 g.cm 3 Tamped density Tamped density 0.84 g.cni 3 0.902 g.cm 3 BET specific surface area BET specific surface area 4.1 m2.g' 8.0 mZ.g' Elastic recovery Elastic recovery 25% 14.68%
Electrical resistance Electrical resistance 2.109 mS2.cm 2.311 mS2.cm Oil absorption Oil absorption 97.2% 1.6% 54.7% 0.8%

Pressed density (2.5 to/cm2) Pressed density (2.5 to/cmZ) 1.972 g.cni 1 .912 g.cni 3 3

Claims (19)

THE EMBODIMENTS OF THE PRESENT INVENTION IN WHICH AN
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS
FOLLOWS:
1. A process for increasing the Scott density of a starting graphite powder of any particle size distribution, the starting graphite powder being a synthetic or natural graphitic carbon which has a high graphite content in the particle, comprising subjecting the starting graphite powder to an autogenous surface treatment in which the individual graphite powder particles are allowed to impact with one another at a measured speed so that their surface structure changes, while retaining graphite particle shape in the absence of a grinding effect occurring and wherein said autogenous surface treatment is carried out until the Scott density or the tamped density of the starting graphite powder has increased by at least 10% to 100%.
2. The process according to claim 1, wherein the starting graphite powder is high-purity graphite.
3. The process according to claim 1 or 2, wherein the starting graphite powder has a xylene density ranging from 1.80 to 2.27 g.cm 3 and a crystal structure characterized by a c/2 value of 0.3354 to 0.3360 nm and an L,, value of more than 40 nm (L c > 40 nm).
4. The process according to any one of claims 1 to 3, wherein the starting graphite powder has a particle size of up to 150µm.
5. The process according to claim 4, wherein the starting graphite powder has a particle size of 1µm to 50µm.
6. The process according to any one of claims 1 to 4, wherein the autogenous surface treatment is carried out until the Scott density or the tamped density of the starting graphite powder has increased by 20% to 80%.
7. The process according to claim 6, wherein the autogenous surface treatment is carried out by fluidizing or dispersing graphite powder particles with sizes of <100µm in an inert carrier gas with the aid of the carrier gas.
8. The process according to claim 6, wherein the autogenous surface treatment is carried out by dispersing graphite powder particles with size of <300µm by means of a rotating mechanical tool.
9. The process according to claim 8, wherein the rotating mechanical tool is a turbine.
10. A process for the preparation of a dispersion in a liquid medium with an increased solid content, wherein the starting graphite powder being a synthetic or natural graphitic carbon which has a high graphite content in the particle, is subjected to an autogenous surface treatment according to any one of claims 1 to 9, and the obtained powder is subsequently used for the preparation of a dispersion in a liquid medium with an increased solids content.
11. A process for the preparation of an aqueous or solvent-based dispersion, wherein the starting graphite powder being a synthetic or natural graphitic carbon which has a high graphite content in the particle, is subjected to an autogenous surface treatment according to any one of claims 1 to 9 and the obtained powder is subsequently used as a pigment in aqueous or solvent-based dispersions.
12. A process for application to metal foils and plates, wherein the starting graphite powder being a synthetic or natural graphitic carbon, which has a high graphite content in the particle, is subjected to an autogenous surface treatment according to the process of any one of claims 1 to 9, and the obtained is powder subsequently used with a polymeric binder in an aqueous or solvent-based medium and further for application to a metal foil or plate.
13. A process for the production of coatings with an increased graphite/binder ratio and increased electrical and thermal conductivities, wherein the starting graphite powder being a synthetic or natural graphitic carbon which has a high graphite content in the particle, is subjected to an autogenous surface treatment according to the process of any one of claims 1 to 9, and the obtained powder is subsequently used with a polymeric binder in an aqueous or solvent-based medium on a substrate to provide a coating with an increased graphite/binder ratio and increased electrical and thermal conductivities.
14. The process according to claim 13 for the production of gas-tight and liquid-tight coatings on metal substrates, wherein the dispersion is coated on a metallic substrate to provide a gas-tight and liquid-tight coating on the metallic substrate.
15. The process for the preparation of negative electrodes in lithium ion batteries, wherein the coated metal substrates obtained according to claim 14 are used as negative electrodes in lithium ion batteries.
16. A process for preparing a thermoplastic or thermosetting graphite/polymer composite from a thermoplastic or thermosetting polymer wherein the starting graphite powder being a synthetic or natural graphitic carbon which has a high graphite content in the particle, is subjected to an autogenous surface treatment according to the process of any one of claims 1 to 9 and the obtained powder is subsequently used for the preparation of thermoplastic and thermosetting graphite/polymer composites.
17. The process for the production of thermoplastic or thermosetting graphite/polymer composites of claim 16, wherein the composite is further compressed to gas-tight graphite plates of high electrical conductivity to provide a graphite plate of high electrical conductivity.
18. The process for the production of thermoplastic or thermosetting graphite/polymer composites according to claim 17 for use of the obtained graphite plate as a biopolar plate for a polymer electrolyte fuel cell technology.
19. A process for the preparation of a metallic non-ferrous material, wherein the starting graphite powder being a synthetic or natural graphitic carbon which has a high graphite content in the particle, is subjected to an autogenous surface treatment according to any one of claims 1 to 9 and the obtained powder is subsequently used for the preparation of metallic non-ferrous sintered materials.
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Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4065136B2 (en) * 2002-02-19 2008-03-19 三井鉱山株式会社 Method for producing spheroidized graphite particles
JP4252847B2 (en) * 2003-06-09 2009-04-08 パナソニック株式会社 Lithium ion secondary battery
JP4133654B2 (en) * 2003-07-01 2008-08-13 本田技研工業株式会社 Polymer electrolyte fuel cell
JP5057260B2 (en) * 2005-10-07 2012-10-24 東海カーボン株式会社 Method for producing separator material for fuel cell
KR100781628B1 (en) * 2006-07-11 2007-12-03 자화전자(주) Graphite composite fuel cell separator and its manufacturing method
JP4441768B2 (en) * 2007-10-18 2010-03-31 島根県 Metal-graphite composite material having high thermal conductivity and method for producing the same
CN101990518A (en) * 2008-02-05 2011-03-23 普林斯顿大学理事会 Coatings comprising functionalized graphene sheets and articles coated therewith
US9196904B2 (en) 2009-02-03 2015-11-24 Imerys Graphite & Carbon Switzerland Sa Graphite material
CA2786180A1 (en) * 2009-12-31 2011-07-07 Sgl Carbon Se Graphite-containing plate and method for producing a graphite-containing plate
DE102009055442A1 (en) * 2009-12-31 2011-07-07 Sgl Carbon Se, 65203 Graphite-containing plate comprises a solidified mixture of largely uniformly distributed graphite particles and plastic particles, where the graphite particles and plastic particles are distributed homogeneously into the mixture
EP2603453A4 (en) 2010-08-11 2015-08-26 Univ Pennsylvania LARGE SCALE GRAPHENE SHEET: ARTICLES, COMPOSITIONS, METHODS AND DEVICES USING THE SAME
CA2808767C (en) * 2010-08-18 2015-08-04 Xinyu Hu Powder particle shaping device and method
JP5776415B2 (en) * 2011-07-28 2015-09-09 住友電気工業株式会社 Method for producing graphite
KR20130122471A (en) * 2012-04-30 2013-11-07 삼성에스디아이 주식회사 Composition for negative electrode of lithium rechargable battery, negative electrode containing the same and lithium rechargable battery containing the same
KR101526412B1 (en) * 2013-10-22 2015-06-05 현대자동차 주식회사 Method for pregaring graphene nanoplate, graphene nanoplate by the method, graphene nanoplate paste, and conductive layer including the same
FR3044243A1 (en) * 2015-11-26 2017-06-02 Michelin & Cie METHOD OF DEPOSITING A METAL, HYDROPHOBIC AND ELECTRICALLY CONDUCTIVE ADHESIVE COATING
ITUA20164647A1 (en) * 2016-06-24 2017-12-24 Eurofibre Spa ANGLING ASSIST TO BE USED IN THE PRODUCTION OF FERTILIZED FELT IN MINERAL WOOL AND A METHOD FOR REALIZING FELT AGUGLIATI
KR20190046968A (en) 2016-09-12 2019-05-07 이머리스 그래파이트 앤드 카본 스위춰랜드 리미티드 Composition and uses thereof
US11081690B2 (en) 2016-09-12 2021-08-03 Imerys Graphite & Carbon Switzerland Ltd. Compositions and uses thereof
CN109690837B (en) 2016-09-12 2023-05-23 英默里斯石墨及活性炭瑞士有限公司 Composition and its use
CN109503166B (en) * 2018-09-29 2021-07-23 广东凯金新能源科技股份有限公司 A kind of graphite negative electrode material for platform type lithium ion battery and preparation method thereof
JP2022552826A (en) 2019-10-07 2022-12-20 イメルテック Graphite composition and use in battery technology
KR20220143674A (en) * 2020-02-14 2022-10-25 쇼와덴코머티리얼즈가부시끼가이샤 Negative electrode for secondary battery, secondary battery, and negative electrode material for secondary battery
DE102020203927A1 (en) * 2020-03-26 2021-09-30 Sgl Carbon Se Manufacture of particles comprising carbon
KR20210131660A (en) 2020-04-24 2021-11-03 주식회사 카보랩 Manufacturing method of bulk graphite having controlled mechanical property and Bulk graphite manufactured by the same
JP7355942B2 (en) * 2020-07-31 2023-10-03 寧徳時代新能源科技股▲分▼有限公司 Secondary batteries, manufacturing methods thereof, battery modules, battery packs, and devices including the secondary batteries
US20220131133A1 (en) * 2020-10-26 2022-04-28 Electronics And Telecommunications Research Institute Composite electrode for all-solid-state secondary battery
WO2022162950A1 (en) * 2021-02-01 2022-08-04 昭和電工マテリアルズ株式会社 Negative electrode material for lithium-ion secondary battery, method for evaluating negative electrode material, method for manufacturing same, negative electrode for lithium-ion secondary battery, and lithium-ion secondary battery
US20240347728A1 (en) * 2021-02-24 2024-10-17 Focus Graphite Inc. Advanced anode materials comprising spheroidal additive-enhanced graphite particles and process for making same
CN113916713B (en) * 2021-09-28 2024-07-16 苏州中材非金属矿工业设计研究院有限公司 Separation and determination method of graphite impurities
US12351462B1 (en) 2024-10-25 2025-07-08 Urbix, Inc. Graphite shaping and coating devices, systems, and methods

Family Cites Families (190)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB991581A (en) 1962-03-21 1965-05-12 High Temperature Materials Inc Expanded pyrolytic graphite and process for producing the same
GB1126734A (en) 1965-04-09 1968-09-11 Pirelli Ltd Articles of furniture upholstery supports and a method of mounting said supports
DE1533253C3 (en) * 1966-12-01 1975-02-13 Bayer Ag, 5090 Leverkusen Electrodes for heating oxygen and a process carried out by means of these electrodes
US3642538A (en) 1969-10-31 1972-02-15 Zito Co Metal halide battery
US3626149A (en) 1970-01-02 1971-12-07 Superior Graphite Co Thermally conductive concrete with heating means
US3807961A (en) 1970-02-24 1974-04-30 Superior Graphite Co Apparatus for high-temperature treatment of petroleum coke
US3684446A (en) 1970-02-24 1972-08-15 Superior Graphite Co Method for high-temperature treatment of petroleum coke
US3852113A (en) 1971-12-30 1974-12-03 Osaka Soda Co Ltd Positive electrode for high energy primary cells and cells using same
US3853793A (en) * 1972-01-07 1974-12-10 Alcan Res & Dev Production of carbon electrodes
US4041220A (en) 1972-08-18 1977-08-09 Agence Nationale De Valorisation De La Recherche (Anvar) Mixed conductors of graphite, processes for their preparation and their use, notably for the production of electrodes for electrochemical generators, and new electrochemical generators
DE2902252C2 (en) * 1979-01-20 1983-11-17 Sigri Elektrographit Gmbh, 8901 Meitingen Flexible graphite laminate and method for its manufacture
US4308073A (en) * 1979-06-27 1981-12-29 Phillips Petroleum Company Pellets of graphite and carbon black and method of producing
WO1981002292A1 (en) 1980-02-08 1981-08-20 Superior Graphite Co Improved methods and apparatus for the continuous production of carbides
US4543240A (en) 1980-02-08 1985-09-24 Superior Graphite Co. Method for the continuous production of carbides
US4409073A (en) 1980-06-30 1983-10-11 Superior Graphite Co. Process for the electrolytic reduction of metals and an improved particulate carbon electrode for the same
DE3028836C2 (en) 1980-07-30 1986-04-17 Brown, Boveri & Cie Ag, 6800 Mannheim Electrochemical storage cell
US4294438A (en) * 1980-07-30 1981-10-13 The Stackpole Corporation Replaceable liner for a crucible
JPS6015592B2 (en) 1981-01-27 1985-04-20 黒崎窯業株式会社 Highly corrosion resistant and highly airtight packing material
US4369171A (en) * 1981-03-06 1983-01-18 Great Lakes Carbon Corporation Production of pitch and coke from raw petroleum coke
JPS5847379A (en) 1981-09-17 1983-03-19 Sony Corp Solid-state image pickup device
US4547430A (en) 1981-11-10 1985-10-15 Superior Graphite Company Ultra-microcrystallite silicon carbide product
US4435444A (en) 1981-11-10 1984-03-06 Superior Graphite Co. Method of making ultra-microcrystallite silicon carbide product
EP0085121B1 (en) 1982-01-29 1985-06-12 SIGRI GmbH Process for producing exfoliated graphite particles
JPS58156515U (en) 1982-04-12 1983-10-19 株式会社佐藤鉄工所 Medical bath water filtration device
US4631304A (en) * 1983-07-29 1986-12-23 Phillips Petroleum Company Novel carbon black and process for preparing same
JPS60166211U (en) 1984-04-12 1985-11-05 三菱電機株式会社 supervisory control console
US4560409A (en) 1984-08-29 1985-12-24 Superior Graphite Metal bearing graphitic carbons
DE3505656A1 (en) 1985-02-19 1986-08-28 Sigri GmbH, 8901 Meitingen Process for producing graphite sheet
US4634545A (en) 1985-03-07 1987-01-06 Superior Graphite Co. Railroad track lubricant
ES2028784T3 (en) 1985-12-03 1992-07-16 Klinger Ag CLOSING ORGAN.
US4863818A (en) 1986-06-24 1989-09-05 Sharp Kabushiki Kaisha Graphite intercalation compound electrodes for rechargeable batteries and a method for the manufacture of the same
JPS63135653A (en) 1986-11-25 1988-06-08 Nippon Pillar Packing Co Ltd Packing material
EP0274165B1 (en) 1987-01-05 1992-03-18 Superior Graphite Co. Thermal purification of natural mineral carbons
DE3704537A1 (en) 1987-02-13 1988-08-25 Sigri Gmbh Process for producing graphite film
JP2543583B2 (en) 1987-08-31 1996-10-16 ユニオン、カーバイド、コーポレーション Graphite flakes manufacturing method
US4895713A (en) 1987-08-31 1990-01-23 Union Carbide Corporation Intercalation of graphite
US5183491A (en) 1987-10-14 1993-02-02 Saint-Gobain Recherche Material for the tempering of glass
FR2626496B1 (en) 1988-01-29 1990-06-01 Elf Aquitaine PROCESS FOR IMPROVING THE ABSORPTION AND DESORPTION CHARACTERISTICS OF A GAS BY A REACTION MEDIUM
JPH064482B2 (en) 1988-06-08 1994-01-19 三井鉱山株式会社 Flake graphite powder and method for producing the same
JPH0645446B2 (en) * 1988-09-19 1994-06-15 東海カーボン株式会社 Method for producing high-purity graphite fine powder
US5246638A (en) 1988-12-20 1993-09-21 Superior Graphite Co. Process and apparatus for electroconsolidation
US5348694A (en) 1988-12-20 1994-09-20 Superior Graphite Co. Method for electroconsolidation of a preformed particulate workpiece
US5294382A (en) 1988-12-20 1994-03-15 Superior Graphite Co. Method for control of resistivity in electroconsolidation of a preformed particulate workpiece
CA2005002C (en) 1988-12-20 2003-01-28 William M. Goldberger Improved method for electroconsolidation of a preformed particulate workpiece
DE3909017C1 (en) 1989-03-18 1990-04-12 Metzeler Schaum Gmbh, 8940 Memmingen, De
US5301960A (en) 1989-03-31 1994-04-12 Suggs Group, Inc. Improved spirally-formed seal for shafts and valve stems
JPH02266164A (en) 1989-04-07 1990-10-30 Agency Of Ind Science & Technol Spiral wound gasket and manufacture thereof
US5149518A (en) 1989-06-30 1992-09-22 Ucar Carbon Technology Corporation Ultra-thin pure flexible graphite calendered sheet and method of manufacture
JPH0714805B2 (en) * 1989-07-28 1995-02-22 オリエンタル産業株式会社 Improved graphite powder, dry battery and sliding member containing the improved graphite powder
EP0432944A1 (en) 1989-12-07 1991-06-19 General Electric Company Expanded pyrolytic graphite; process for making expanded pyrolytic graphite; and insulation produced therefrom
US5282975A (en) 1989-12-25 1994-02-01 Technion Research And Development Foundation Ltd. Removal of oil from water
US5370405A (en) 1991-08-30 1994-12-06 Nippon Pillar Packing Co., Ltd. Packing
FR2658893B1 (en) 1990-02-23 1994-02-11 Supranite Ste Indle Equip Meca PROCESS FOR PRODUCING A SEALING RING AND PRODUCT OBTAINED ACCORDING TO THE PROCESS.
JPH0726683B2 (en) 1990-02-26 1995-03-29 日本ピラー工業株式会社 Packing and manufacturing method thereof
DE4007075A1 (en) 1990-03-07 1991-09-12 Bayer Ag INTUMESCENT MOLDED PARTS
JP2913107B2 (en) 1990-03-26 1999-06-28 日新製鋼株式会社 Material for expanded graphite gasket
DE4010752A1 (en) 1990-04-03 1991-10-10 Metzeler Schaum Gmbh METHOD FOR PRODUCING A FLAME-RESISTANT, ELASTIC POLYURETHANE-SOFT FOAM
US5397643A (en) 1990-04-03 1995-03-14 Bayer Aktiengesellschaft Lightweight shaped articles containing expandable graphite, their production and their use
JP2578545B2 (en) 1990-04-11 1997-02-05 ソシエテ・ナシオナル・エルフ・アキテーヌ Active complex and use of the complex as reaction medium
DE4016710A1 (en) 1990-05-24 1991-11-28 Bayer Ag METHOD FOR PRODUCING MOLDED PARTS
US5336520A (en) * 1990-06-18 1994-08-09 The United States Of America As Represented By The United States Department Of Energy High density-high purity graphite prepared by hot isostatic pressing in refractory metal containers
FR2665104B1 (en) 1990-07-26 1992-10-09 Lorraine Carbone PROCESS FOR THE MANUFACTURE OF WATERPROOF PARTS IN AN ALL CARBON COMPOSITE MATERIAL.
JP2884746B2 (en) * 1990-09-03 1999-04-19 松下電器産業株式会社 Non-aqueous electrolyte secondary battery
JPH06100727B2 (en) 1990-10-29 1994-12-12 佐原 今朝徳 Supporting structure for center of gravity of machinery
JPH0721308Y2 (en) 1990-10-30 1995-05-17 信越化学工業株式会社 Thermal conductive sheet
JPH04170310A (en) 1990-11-02 1992-06-18 Alps Electric Co Ltd Graphite intercalation compound and its manufacturing method
US5103609A (en) 1990-11-15 1992-04-14 Minnesota Mining & Manufacturing Company Intumescable fire stop device
FR2671848B1 (en) 1991-01-23 1993-04-09 Supranite Ste Indle Equip Meca SEAL, PARTICULARLY FOR FLANGE CONNECTION.
US5421594A (en) 1991-02-14 1995-06-06 Marine & Petroleum Mfg., Inc. Gasket
DE4117077A1 (en) 1991-05-25 1992-11-26 Bayer Ag METHOD FOR PRODUCING MOLDED BODIES
JP2769523B2 (en) 1994-01-31 1998-06-25 株式会社キッツ Packing ring structure and manufacturing method thereof, and sealing device using the same
FR2677975B1 (en) 1991-06-19 1994-02-18 Centre Nal Recherc Scientifique PROCESS FOR THE PREPARATION OF EXPANDED CARBON MATERIALS, AND PRODUCTS OBTAINED.
JPH04372686A (en) 1991-06-21 1992-12-25 Toyo Tanso Kk Manufacture of expanded graphite sheet
US5382387A (en) 1991-07-15 1995-01-17 Bayer Aktiengesellschaft Mouldings containing expandable graphite, their production and their use
DE4125647A1 (en) 1991-08-02 1993-02-04 Klinger Ag Long life tightly sealing glands - have tightly fitting packing rings on e.g. compressed expanded graphite contg. inserts of low friction e.g. PTFE
JPH05213611A (en) * 1991-08-09 1993-08-24 Asahi Glass Co Ltd Graphite powder and method for hydrophilizing graphite powder
FR2682464A1 (en) 1991-10-10 1993-04-16 Elf Aquitaine METHOD FOR IMPROVING HEAT AND MASS TRANSFERS TO AND / OR THROUGH A WALL.
JP3713283B2 (en) 1992-02-28 2005-11-09 日清紡績株式会社 Heat resistant adhesive composition
CA2094367A1 (en) 1992-04-22 1993-10-23 Michael Windsor Symons Composite panel
US5226662A (en) 1992-07-07 1993-07-13 Fel-Pro Incorporated Expanded graphite and metal core automotive head gasket
GB9216604D0 (en) 1992-08-05 1992-09-16 T & N Technology Ltd Gasket manufacture
JPH06100727A (en) * 1992-08-06 1994-04-12 Nippon Kasei Chem Co Ltd Conductive resin composition and method for producing the same
JP3139179B2 (en) 1992-10-12 2001-02-26 オイレス工業株式会社 Spherical band seal
US5788865A (en) 1992-10-14 1998-08-04 Herbert F. Boeckman, II Process for separating a hydrophobic liquid from a liquid contaminated therewith
IL103641A (en) 1992-11-04 1996-11-14 Environmental Systems Ltd Expandable graphite compositions for absorption of liquids and method for the manufacture thereof
RU2049552C1 (en) * 1992-11-27 1995-12-10 Николай Федорович Феофанов Mill
US5683778A (en) 1992-12-09 1997-11-04 Crosier; Robert A. Braided graphite-foil and method of production
DE59305146D1 (en) 1992-12-12 1997-02-27 Klinger Ag Shut-off valve and sealing ring
US5270902A (en) 1992-12-16 1993-12-14 International Business Machines Corporation Heat transfer device for use with a heat sink in removing thermal energy from an integrated circuit chip
DE4300464C1 (en) 1993-01-11 1994-06-09 Dow Corning Gmbh Solid lubricant combination, process for their production and their use
US5549306A (en) 1993-01-21 1996-08-27 Nippon Pillar Packing Co., Ltd. Knitting yarn for gland packing and gland packing made of said knitting yarn
US5468003A (en) 1993-02-26 1995-11-21 Dana Corporation Reinforced core heavy duty gasket
US5362074A (en) 1993-02-26 1994-11-08 Dana Corporation Reinforced core heavy duty gasket
FR2702678B1 (en) 1993-03-18 1995-06-16 Elf Aquitaine Method for producing an active composite.
DE4309700C2 (en) 1993-03-25 1995-02-23 Sigri Great Lakes Carbon Gmbh Process for the production of a laminate from metal and graphite
DE4325757A1 (en) 1993-07-31 1995-02-02 Gruenau Gmbh Chem Fab Pipe bulkhead with a sheet metal jacket that can be bent around a pipe
WO1995003890A1 (en) 1993-08-03 1995-02-09 Indresco Inc. Beneficiation of flake graphite
US5413359A (en) 1993-08-31 1995-05-09 Latty International S.A. Gasket
US5431831A (en) 1993-09-27 1995-07-11 Vincent; Larry W. Compressible lubricant with memory combined with anaerobic pipe sealant
DE4337071C1 (en) 1993-10-29 1995-03-02 Nico Pyrotechnik Pyrotechnic smoke charge for camouflage purposes and its use in a smoke body
JPH07161589A (en) 1993-12-06 1995-06-23 Nisshinbo Ind Inc Electric double-layer capacitor
JP2645800B2 (en) 1993-12-14 1997-08-25 日本ピラー工業株式会社 Expanded graphite seal material, method for producing the same, and gasket sheet
FR2713512B1 (en) 1993-12-14 1996-01-19 Lorraine Carbone Diffusing elements facilitating the transfer of material in solid-gas reactions.
FR2715081B1 (en) 1994-01-19 1996-02-23 Elf Aquitaine Reagent in the form of granules for thermochemical systems.
FR2715082B1 (en) 1994-01-19 1996-02-23 Elf Aquitaine Process for producing an active composite and active composite produced from this process.
FR2715442B1 (en) 1994-01-26 1996-03-01 Lorraine Carbone Centrifugal pump with magnetic drive.
JP2566529B2 (en) 1994-01-31 1996-12-25 日本ピラー工業株式会社 Sheet gasket
JP3450894B2 (en) 1994-03-28 2003-09-29 松下電器産業株式会社 Alkaline manganese battery
JP2594231B2 (en) 1994-05-09 1997-03-26 日本ピラー工業株式会社 Gland packing
US5503717A (en) 1994-06-13 1996-04-02 Kang; Feiyu Method of manufacturing flexible graphite
US5882570A (en) * 1994-06-20 1999-03-16 Sgl Technic, Inc. Injection molding graphite material and thermoplastic material
US6746626B2 (en) 1994-06-20 2004-06-08 Sgl Technic Inc. Graphite polymers and methods of use
DE69506950T2 (en) 1994-06-20 2000-01-13 Sgl Technic Inc., Graphite foam materials and methods of making the same
JPH08100227A (en) 1994-07-30 1996-04-16 Sumitomo Electric Ind Ltd Sintered sliding member
US5454397A (en) 1994-08-08 1995-10-03 Fel-Pro Incorporated Reed valve assembly and gas compressor incorporating same
US5560892A (en) 1994-09-26 1996-10-01 Indresco Inc. Apparatus system for beneficiation of kish graphite
JPH08253826A (en) 1994-10-19 1996-10-01 Sumitomo Electric Ind Ltd Sintered friction material, composite copper alloy powder used therein, and method for producing the same
US5531454A (en) 1994-12-29 1996-07-02 Indian Head Industries, Inc. Expandable gasket, sealed joint and method of forming same
IL116552A (en) * 1995-01-10 2001-09-13 Cabot Corp Carbon black compositions, polymer compositions including the carbon black compositions and articles of manufacture including the polymer compositions
JPH08213020A (en) * 1995-02-07 1996-08-20 Kansai Coke & Chem Co Ltd Secondary battery electrode material
US5683281A (en) 1995-02-27 1997-11-04 Hitco Technologies, Inc High purity composite useful as furnace components
US5858486A (en) 1995-02-27 1999-01-12 Sgl Carbon Composites, Inc. High purity carbon/carbon composite useful as a crucible susceptor
FR2732243B1 (en) 1995-03-28 1997-05-23 Elf Aquitaine ACTIVE COMPOSITE WITH LAMINATED STRUCTURE AND ITS USE AS A REACTION MEDIUM
JP3069509B2 (en) 1995-04-10 2000-07-24 株式会社日立製作所 Non-aqueous secondary battery and method for producing graphite powder
JPH08298117A (en) * 1995-04-26 1996-11-12 Kansai Coke & Chem Co Ltd Secondary battery electrode material
DE69609668T2 (en) 1995-05-29 2001-04-12 Nisshinbo Industries, Inc. Carbon composite material and process for its manufacture
US5765838A (en) 1995-06-06 1998-06-16 Nippon Pillar Packing Co., Ltd. Sealing gasket made of expanded graphite, with opened thin-leaf surface structure
WO1997002612A1 (en) 1995-07-05 1997-01-23 Nisshinbo Industries, Inc. Separator for fuel cells of solid polyelectrolyte type and processes of the production thereof
DE19526364C1 (en) 1995-07-20 1996-08-14 Klinger Ag Sealing ring of alternate plates of expanded graphite and metal
JPH0955341A (en) 1995-08-11 1997-02-25 Nisshinbo Ind Inc Polarizable electrode for electric double layer capacitor and electric double layer capacitor using the polarizable electrode
EP0797752B1 (en) 1995-10-06 2000-02-09 Manufacture De Vetements Paul Boye S.A. Refrigerating method and device
JPH09106819A (en) * 1995-10-09 1997-04-22 Tdk Corp Manufacture of lithium secondary battery and laminate of film-like carbon
JP3663694B2 (en) * 1995-10-25 2005-06-22 ソニー株式会社 Non-aqueous electrolyte secondary battery
JPH09146306A (en) * 1995-11-28 1997-06-06 Ricoh Co Ltd Electrophotographic toner and method for producing the same
US5772215A (en) 1995-12-08 1998-06-30 Fel-Pro Incorporated Head gasket with improved armoring and method of making same
EG21132A (en) 1995-12-15 2000-11-29 Super Graphite Co Drilling fluid loss prevention and lubrication additive
DE19547711C1 (en) 1995-12-20 1997-01-09 Klinger Ag Process for the production of sealing rings made of expanded graphite
JP3664331B2 (en) * 1996-03-05 2005-06-22 株式会社豊田中央研究所 Graphite microcrystal
US5687974A (en) 1996-03-15 1997-11-18 Calconn, Inc. Packing material having expanded graphite dispersed throughout
JPH09273099A (en) * 1996-04-08 1997-10-21 Toyo Ink Mfg Co Ltd Aqueous pigment dispersion for shading paper
JPH09306506A (en) 1996-05-17 1997-11-28 Nisshinbo Ind Inc Current collector for molten salt battery, manufacture of current collecting material for it, and molten salt battery using its current collector
US5677082A (en) * 1996-05-29 1997-10-14 Ucar Carbon Technology Corporation Compacted carbon for electrochemical cells
US5698088A (en) 1996-07-08 1997-12-16 The Hong Kong University Of Science And Technology Formic acid-graphite intercalation compound
US5722670A (en) 1996-09-06 1998-03-03 Fel-Pro Incorporated Sealing assembly and multi-layer gasket for resisting facing delamination and degradation
US5820788A (en) 1997-01-29 1998-10-13 Sgl Technic Ltd. Electroconductive antistatic polymers containing carbonaceous fibers
DE19710105A1 (en) 1997-03-12 1998-09-17 Sgl Technik Gmbh Silicon carbide body reinforced with short graphite fibers
US6017633A (en) 1997-03-18 2000-01-25 Ucar Carbon Technology Corporation Flexible graphite composite sheet and method
US5981072A (en) 1997-04-04 1999-11-09 Ucar Carbon Technology Corporation Oxidation and corrosion resistant flexible graphite composite sheet and method
TW385298B (en) 1997-04-04 2000-03-21 Ucar Carbon Tech Oxidation and corrosion resistant flexible graphite composite sheet and method
JP4029947B2 (en) * 1997-05-30 2008-01-09 三菱化学株式会社 Method for producing highly filling carbonaceous powder
KR100483126B1 (en) * 1997-05-30 2005-04-14 마츠시타 덴끼 산교 가부시키가이샤 Nonaqueous electrolyte secondary battery
US5976727A (en) 1997-09-19 1999-11-02 Ucar Carbon Technology Corporation Electrically conductive seal for fuel cell elements
US6828064B1 (en) * 1998-01-07 2004-12-07 Eveready Battery Company, Inc. Alkaline cell having a cathode incorporating enhanced graphite
US6416815B2 (en) 1998-01-29 2002-07-09 Graftech Inc. Expandable graphite and method
US6149972A (en) 1998-01-29 2000-11-21 Ucar Graph-Tech. Inc. Expandable graphite and method
DE19804283B4 (en) 1998-02-04 2006-10-12 Sgl Carbon Ag Metal reinforced graphite laminate
US6287694B1 (en) 1998-03-13 2001-09-11 Superior Graphite Co. Method for expanding lamellar forms of graphite and resultant product
JP3787030B2 (en) * 1998-03-18 2006-06-21 関西熱化学株式会社 Scale-like natural graphite modified particles, process for producing the same, and secondary battery
JP4379925B2 (en) * 1998-04-21 2009-12-09 住友金属工業株式会社 Graphite powder suitable for anode material of lithium ion secondary battery
DE19828790A1 (en) 1998-06-27 1999-12-30 Sgl Technik Gmbh Packing yarn made of graphite and metal foil
NO311622B1 (en) * 1998-09-25 2001-12-17 Kvaerner Technology & Res Ltd Use of carbon medium for hydrogen storage
JP3866884B2 (en) 1998-10-08 2007-01-10 松下電器産業株式会社 Alkaline battery
US6194358B1 (en) 1998-11-06 2001-02-27 Superior Graphite Co. Hopper car anti-bridging method and coating
US6169059B1 (en) 1998-11-19 2001-01-02 Superior Graphite Co. High-temperature, water-based lubricant and process for making the same
US6632569B1 (en) * 1998-11-27 2003-10-14 Mitsubishi Chemical Corporation Carbonaceous material for electrode and non-aqueous solvent secondary battery using this material
US6406612B1 (en) 1999-05-20 2002-06-18 Graftech Inc. Expandable graphite and method
JP3074170B1 (en) * 1999-05-27 2000-08-07 大澤 映二 Manufacturing method of nano-sized spherical graphite
JP3412141B2 (en) 1999-09-22 2003-06-03 日清紡績株式会社 Method of manufacturing fuel cell separator
US6686083B1 (en) 1999-10-20 2004-02-03 Nisshinbo Industries, Inc. Carbonaceous composite material, process for production thereof, fuel cell separator, and polymer electrolyte fuel cell
US6372376B1 (en) * 1999-12-07 2002-04-16 General Motors Corporation Corrosion resistant PEM fuel cell
DE10003927A1 (en) 2000-01-29 2001-08-02 Sgl Technik Gmbh Process for the preparation of expandable graphite intercalation compounds using phosphoric acids
US6660434B2 (en) 2000-03-06 2003-12-09 Superior Graphite Co. Engineered carbonaceous materials and power sources using these materials
US6555223B2 (en) 2000-03-08 2003-04-29 Sgl Technic, Inc. Graphite structure with increased flexibility
US6558782B1 (en) 2000-04-18 2003-05-06 Sgl Technic, Inc. Flexible graphite sheet and method of producing the same
US6756027B2 (en) 2000-05-24 2004-06-29 Superior Graphite Co. Method of preparing graphite intercalation compounds and resultant products
US6395199B1 (en) 2000-06-07 2002-05-28 Graftech Inc. Process for providing increased conductivity to a material
US6413663B1 (en) 2000-06-29 2002-07-02 Graftech Inc. Fluid permeable flexible graphite fuel cell electrode
WO2002066245A1 (en) 2000-11-02 2002-08-29 Graftech Inc. Flexible graphite sheet having increased isotropy
US6605379B1 (en) 2000-11-03 2003-08-12 Grafttech Inc. Hydrophobic fuel cell electrode
US6669919B1 (en) 2000-11-16 2003-12-30 Advanced Energy Technology Inc. Intercalated graphite flakes exhibiting improved expansion characteristics and process therefor
AU2002236468A1 (en) 2000-11-16 2002-05-27 Superior Graphite Co. Electrically conductive pavement mixture
DE10060838A1 (en) 2000-12-07 2002-06-13 Sgl Carbon Ag Resin-impregnated expanded graphite products, useful as sealing elements, fuel cell components or heat-conducting elements, comprises a solvent-free low-viscosity acrylic resin
DE10060839A1 (en) 2000-12-07 2002-06-13 Sgl Carbon Ag Impregnated body made of expanded graphite
US20020164483A1 (en) 2001-04-04 2002-11-07 Mercuri Robert Angelo Graphite article having predetermined anisotropic characteristics and process therefor
US6620359B1 (en) 2001-04-11 2003-09-16 Sgl Technic, Inc. Water based method of making expanded graphite the product produced and expanded graphite polymeric pellets
JP3635044B2 (en) * 2001-06-08 2005-03-30 三井鉱山株式会社 Negative electrode material for lithium secondary battery, method for producing the same, and lithium secondary battery
US6787029B2 (en) * 2001-08-31 2004-09-07 Cabot Corporation Material for chromatography
US20030113542A1 (en) 2001-12-13 2003-06-19 Graftech Inc. High surface area carbon composites
US20030116753A1 (en) 2001-12-21 2003-06-26 Graftech Inc. High surface area carbon composites
GB2432830A (en) * 2005-12-02 2007-06-06 Morganite Elect Carbon Formation of thermally anisotropic carbon material

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