Carbonaceous materials and methods of use thereof

A technology of carbon coating and particles, which is applied in the field of carbon-containing materials and its application, and can solve problems affecting battery parameters, etc.

Pending Publication Date: 2018-09-28
IMERYS GRAPHITE & CARBON SWITZERLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] While simultaneous improvements in all major battery parameters like energy density, power density, durability, and safety would be desirable, improving one parameter will often negatively affect other battery parameters

Method used

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  • Carbonaceous materials and methods of use thereof
  • Carbonaceous materials and methods of use thereof
  • Carbonaceous materials and methods of use thereof

Examples

Experimental program
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Effect test

example 1

[0176] A number of highly resilient, surface-modified graphite materials were fabricated according to the general methods listed below. Table 2a summarizes the characteristics of these materials (particle size distribution, c / 2, L c , L a , ratio I D / I G , BET SSA and rebound).

[0177] General method for making surface-modified carbonaceous particulate materials

[0178] The following is a general description of how the various carbonaceous materials shown in the examples were obtained.

[0179] Low rebound components:

[0180] Synthetic graphite:

[0181] Petroleum based coke is graphitized at a temperature above 2500°C under an inert gas atmosphere and ground to a suitable particle size distribution.

[0182] Natural flake graphite:

[0183] Chemically or thermally purified natural graphite flakes are ground to the appropriate particle size distribution.

[0184] High resilience components:

[0185] Method A:

[0186] Petroleum or coal based coke is ground and...

example 2

[0205] Following the steps described in Example 1, high resilience graphite (graphite A) was mixed with low resilience graphite as the main component to produce a negative electrode. The specific wt% of high resilience graphite and low resilience graphite employed are given in Table 3. The electrochemical measurements characterizing the obtained graphite anodes are also shown in Table 3.

[0206] Table 3: Reversible capacity and cycle stability characterization of anodes produced using exemplary graphite compositions

[0207] main graphite components

[0208] *Capacity lost per cycle for 2nd - 12th charging cycle

example 3

[0211] According to the steps described in Example 1, another high resilience graphite (graphite C) was mixed with low resilience graphite as a main component to produce a graphite negative electrode. The specific wt% of high resilience graphite and low resilience graphite employed are given in Table 4. The electrochemical measurements characterizing the obtained graphite anodes are also shown in Table 4.

[0212] Table 4: Electrode resistance, reversible capacity, high current rate performance characterization of various graphite anodes produced using exemplary graphite compositions

[0213]

[0214] * Comparative example

[0215] As shown in Table 4, the low resilience graphite material was found to reduce electrode resistance at relatively low amounts, but resulted in increased resistance at higher amounts. However, increasing the amount of low-rebound graphite material leads to a continuous increase in the reversible capacity of the electrode. This indicates that the...

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Abstract

The present disclosure relates to compositions comprising at least two different carbonaceous components, at least one being a surface-modified carbonaceous particulate material typically having a relatively high spring-back, and at least one other component being a carbonaceous particulate material (such as graphite) generally having a lower spring-back and / or a higher BET specific surface area than the surface-modified carbonaceous material component. Such compositions are particularly useful for making negative electrodes for lithium-ion batteries and the like in view of their beneficial electrochemical properties, particularly in automotive and energy storage applications. The present disclosure also relates to the use of a low-spring-back carbonaceous particulate materials as an additive in carbonaceous compositions, wherein said compositions are used to prepare anodes for Li-ion batteries in order to increase the electrode density, the cell capacity and / or the cycling stability of said battery while maintaining the power density of the cell compared to a cell with an anode absent the carbonaceous additive.

Description

technical field [0001] The present disclosure relates to compositions comprising at least two different carbonaceous (carbonaceous) components, at least one of which is a surface-modified carbonaceous particulate material, which generally has a relatively high spring-back, and At least one other component is a carbonaceous particulate material such as graphite, which generally has lower resilience and / or a higher BET specific surface area than the surface-modified carbonaceous material component. In view of its electrochemical properties, especially in automotive and energy storage applications, this composition is particularly suitable for the manufacture of negative electrodes for lithium-ion batteries and the like. [0002] The present disclosure also relates to the use of a low resilience carbonaceous particulate material as an additive in a carbonaceous composition, wherein the composition is used to prepare an anode for a Li-ion battery, for example, to be compatible wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/20H01M4/587H01M10/0525
CPCH01M4/587C01B32/21C01B32/205H01M4/133H01M4/1393H01M4/366H01M2220/20Y02E60/10C01B32/23H01M4/364H01M10/0525C01P2006/40C01P2004/80C01P2006/12C01P2002/02C08K3/042C01P2002/74C01P2002/82C01P2004/51C01P2006/80C08L87/00
Inventor 米哈尔·古拉斯米夏埃尔·斯帕尔帕特里克·兰兹皮尔明·乌尔曼守冈宏之滝博之西川未佳泷泽香南子渡边宏政
Owner IMERYS GRAPHITE & CARBON SWITZERLAND
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