Modified natural graphite material and preparation method thereof, negative pole piece and lithium ion battery

A natural graphite and modified technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of inability to effectively improve the internal pores of natural graphite particles, high expansion rate of natural graphite negative electrode materials, and poor cycle performance, and achieve suitable The effect of expanding large-scale production, low cost and high practicability

Pending Publication Date: 2022-08-02
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating modification method adopted at this stage cannot effectively improve the internal pores of natural graphite particles, causing side reactions to occur repeatedly during the cycle, resulting in high expansion rate and poor cycle performance of natural graphite anode materials

Method used

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  • Modified natural graphite material and preparation method thereof, negative pole piece and lithium ion battery
  • Modified natural graphite material and preparation method thereof, negative pole piece and lithium ion battery
  • Modified natural graphite material and preparation method thereof, negative pole piece and lithium ion battery

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preparation example Construction

[0093] The non-graphite converted carbon and carbon-containing organics will be described in detail below in conjunction with the preparation method of the modified natural graphite material.

[0094] Embodiments of the present application also provide a method for preparing a modified natural graphite material, comprising the following steps:

[0095] Mixing the natural graphite raw material with the first modifier to obtain the first mixture;

[0096] The first mixture is heated to a first temperature, evacuated, and sequentially carried out for the first time keeping, heating up to a second temperature, holding a second time, and cooling down to a third temperature; and

[0097] adding a second modifier to the first mixture to obtain a second mixture;

[0098] Then, the second mixture is heated to the first temperature, and vacuumized, and the first time insulation, the temperature increase to the second temperature, the second heat preservation, and the cooling to the thi...

Embodiment 1

[0142] First, the 100-mesh flake graphite is mechanically pulverized, and then classified and shaped. The powder parameters after shaping are as follows (D50=15.6μm, Tap=0.912g / cc, D90 / D10=3.1, SSA is 8.6m 2 / g, the slice diagram is as follows figure 1 shown, the pore volume is 0.018 cm 3 / g).

[0143] After that, the obtained natural graphite raw material was mixed with the first modifier coal pitch (softening point of 160° C.) in a ratio of 0.85:0.07, and the mixing was carried out by VC mixing, and the mixing time was 30 minutes.

[0144] Then, put the mixed materials into the reaction kettle, and the reaction kettle adopts the method of gradually heating up, and the heating rate is 2 °C / min. While heating, the reaction kettle is kept in a state of constant stirring, and the temperature is raised to 190 °C, and the reaction kettle is pumped to pressure. is -0.1Mpa, and then kept for 2h; after the heat preservation, the reaction kettle was heated to 650 ° C and kept for 2 ...

Embodiment 2

[0148] First, 100 mesh flake graphite was mechanically pulverized, and then classified and shaped. The powder parameters after shaping were as follows (D50=8.1μm, Tap=0.874g / cc, D90 / D10=2.3, SSA was 9.7m 2 / g.

[0149]Then, the obtained natural graphite raw material was mixed with the first modifier petroleum pitch (softening point 250° C.) in a ratio of 0.92:0.04, and the mixing was carried out by VC mixing, and the mixing time was 30 minutes.

[0150] Then, put the mixed materials into the reaction kettle, and the reaction kettle adopts the method of gradually heating up, and the heating rate is 2 °C / min. While heating, the reaction kettle is kept in a state of constant stirring, and the temperature is raised to 280 °C, and the reaction kettle is pumped to pressure. After the heat preservation, the reaction kettle was heated to 650°C and kept for 2h; then the reaction kettle was cooled to about 250°C, and the second modifier was slowly added to the inside of the reaction ket...

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Abstract

The invention provides a modified natural graphite material and a preparation method thereof, a negative electrode plate and a lithium ion battery, and relates to the technical field of battery negative electrode materials. The modified natural graphite material comprises a natural graphite matrix, at least part of pores in the natural graphite matrix are filled with the non-graphitized carbon; the pore volume of the modified natural graphite material is 0.004 cm < 3 > / g to 0.009 cm < 3 > / g. The problems that an existing natural graphite negative electrode material is high in expansion rate and poor in cycle performance can be solved.

Description

technical field [0001] The present application relates to the technical field of battery negative electrode materials, and in particular, to a modified natural graphite material and a preparation method thereof, a negative electrode pole piece and a lithium ion battery. Background technique [0002] At present, in order to reduce dependence on oil and improve national energy security, the development of pure electric vehicles has become China's national strategy. However, the existing pure electric vehicles have not yet achieved real marketization due to the high cost. Among them, the power battery is an important part of the electric vehicle, and the power battery generally accounts for 1 / 3 or more of the cost of the whole vehicle. Therefore, how to reduce the cost of the power battery has become the focus of the industry. [0003] The negative electrode material is an important part of the power battery, which determines the performance and cost of the battery. At this s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/133H01M10/0525
CPCH01M4/583H01M4/133H01M10/0525H01M2004/021H01M2004/027
Inventor 周海辉李东东潘修军任建国贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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