Negative electrode material and preparation method thereof, negative electrode plate, electrochemical device and electronic device

A technology of negative electrode material and negative electrode plate, which is applied in the field of electrochemistry and can solve the problems of reduced rate, need for improvement, difficult preparation, etc.

Pending Publication Date: 2022-05-27
NINGDE AMPEREX TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the volume expansion problem (more than 300%) of silicon-based negative electrode materials in the cycle process has seriously affected the process of industrial application of silicon-based negative electrode materials.
[0003] At present, the main method to solve the large volume change (120% to 300%) and poor conductivity (<0.01S/cm) of silicon materials during the cycle is the nano-silicon materials, silicon materials and graphite or other materials (metal or non-metal) Composite and surface coating, etc., but there are certain defects,

Method used

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  • Negative electrode material and preparation method thereof, negative electrode plate, electrochemical device and electronic device
  • Negative electrode material and preparation method thereof, negative electrode plate, electrochemical device and electronic device
  • Negative electrode material and preparation method thereof, negative electrode plate, electrochemical device and electronic device

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preparation example Construction

[0050] The above-mentioned negative electrode material can be quickly and effectively prepared by this method, the steps are simple, the operation is easy, and the cost is low. At the same time, the obtained negative electrode material has good electrical conductivity and ion transport performance, and the use of the negative electrode material can be improved. Cycling and kinetic performance of electrochemical devices. In this method, an organic silicon source is further selected and compounded with porous graphite to obtain a negative electrode material with long cycle and low expansion, which is suitable for lithium ion batteries and realizes low-cost industrialization.

[0051] In yet another aspect of the present invention, the present invention provides a negative pole piece. According to an embodiment of the present invention, the negative electrode sheet includes the aforementioned negative electrode material, wherein the peel strength between the negative electrode ma...

Embodiment 1

[0072] Embodiment 1: 100g polydimethylsiloxane (molecular formula is (C 2 H 6 OSi) n ), the mass of which is all converted into SiOC (ie Si-M-C) is (28+16+12) / (12×2+1×6+16+28)×100=75.7g, then the content of SiOC is 75.7 / (75.7+175+5)=29.6%;

Embodiment 2-4

[0073] Example 2-4: The calculation method is the same as that in Example 1, except that Si-M-C in Example 2 is SiNC, and Si-M-C in Example 3 is Si 4 BO 3 C 4 , Si-M-C in Example 4 is SiOC+SiNC with a ratio of 1:1.

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Abstract

Provided are a negative electrode material, a method for preparing the same, a negative electrode tab, an electrochemical device, and an electronic device, the negative electrode material comprising: a core comprising: a porous carbon material; the silicon-containing compound Si-M-C is loaded in pores of the porous carbon material, and M is one or more of B, N, O and Al; and a conductive carbon layer on a surface of the core.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, and in particular, to a negative electrode material and a preparation method thereof, a negative electrode pole piece, an electrochemical device and an electronic device. Background technique [0002] One direction of lithium-ion battery technology innovation is to continuously improve energy density. At present, the actual capacity of mainstream graphite materials is close to the theoretical capacity (372mAh / g), and there is a bottleneck in improving energy density. Silicon-based anode materials have attracted much attention and research due to their abundant reserves, ultra-high theoretical capacity (4200mAh / g), and environmental friendliness. However, the volume expansion problem (over 300%) of silicon-based anode materials in the cycle process seriously affects the process of industrial application of silicon-based anode materials. [0003] At present, the main methods to solve the...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/38H01M4/62H01M10/0525
CPCH01M4/625H01M4/386H01M4/134H01M10/0525Y02E60/10
Inventor 陈志焕
Owner NINGDE AMPEREX TECH
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