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A kind of lithium ion battery negative pole preparation method, negative pole and lithium ion battery

A lithium-ion battery and negative electrode technology, which is applied to battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of silicon-based negative electrode material current collectors falling off, reduce the use of current collectors, simplify the preparation process, and provide effective content Effect

Active Publication Date: 2022-04-01
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a method for preparing a negative electrode of a lithium ion battery to solve the technical problem in the prior art that the silicon-based negative electrode material is easy to fall off from the current collector

Method used

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  • A kind of lithium ion battery negative pole preparation method, negative pole and lithium ion battery
  • A kind of lithium ion battery negative pole preparation method, negative pole and lithium ion battery
  • A kind of lithium ion battery negative pole preparation method, negative pole and lithium ion battery

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Effect test

Embodiment 1

[0063] In order to find a suitable Si-containing solid electrolyte, for a variety of Si-containing solid electrolytes listed in Table 1: Li 5 SiN 3 , Li 2 SiO 4 , Li 2 Si(PO 4 ) 2 , Li 2 Si(SO 4 ) 3 , LiSi(NO 3 ) 5 Experiments were carried out, and the electrode ionic conductivity was tested, and the shape of the electrode was recorded. As shown in Table 1, when using Li 2 Si(SO 4 ) 3 , LiSi(NO 3 ) 5 When used as a solid electrolyte, the prepared electrode cannot be integrated into an electrode, and is in the form of powder, and the electrode ionic conductivity is also very low. When using Li 2 SiO 4 , Li 2 Si(PO 4 ) 2 When it is a solid electrolyte, although an integrated electrode can be obtained, the ionic conductivity of the electrode is also low. When using Li 5 SiN 3 When used as a solid electrolyte, not only an integrated electrode can be obtained, but also has excellent motor ion conduction, is stable in the air, has a small interface impedance w...

Embodiment 2

[0067] For Li x Si y N z This type of solid electrolyte, as shown in Table 2, shows that when the value of x / y is between 0.2-8 and the value of y / z is 0.1-0.8, the lithium ion conductivity of the prepared electrode is relatively high. It is relatively stable in air. It can be seen that when choosing this type of Li x Si y N z Solid electrolytes are more conducive to the performance of materials.

[0068] Table 2

[0069]

Embodiment 3

[0071] Table 3 studies different fluxes, such as lithium borate, sodium silicate, potassium silicate, cryolite, and calcium oxide. It is found that lithium borate is the preferred flux, and the prepared motor has an integrated morphology electrode, and the electrode High conductivity. When lithium borate is used as a flux, it can achieve the technical effects of increasing the lithium ion conductivity, lowering the melting point better, and improving the cycle stability of the electrode. The reason may be that it is also a solid electrolyte with a certain lithium ion conductivity. In addition, research has found that lithium borate can bind active materials very firmly, and can also effectively inhibit the volume expansion of silicon, thereby improving integration. Cycling stability of silicon-based anodes.

[0072] table 3

[0073]

[0074]

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Abstract

The invention relates to the technical field of ecological engineering, in particular to a method for preparing a negative electrode of a lithium ion battery. The preparation method comprises: mixing a silicon-based active material, a silicon-containing solid electrolyte, a flux and a conductive agent to obtain a mixture; mixing the above-mentioned mixture Carrying out sheeting treatment to obtain a prefabricated electrode sheet; placing the prefabricated electrode sheet under an inert atmosphere or vacuum condition, calcining at a preset temperature, and obtaining the negative electrode of the lithium ion battery after cooling. In this process, the process of solidifying the negative electrode material of the battery and the current collector in the prior art is avoided, so that the preparation process of the negative electrode of the battery is simplified. The obtained negative electrode of the lithium ion battery integrates the functions of the negative electrode material and the current collector, which can greatly provide the effective content of the high active material of the battery as a whole, thereby increasing the areal capacity of the electrode sheet. The invention also provides a negative pole of the lithium ion battery and the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing a lithium ion battery negative electrode, the negative electrode and the lithium ion battery. Background technique [0002] With the development and maturity of science and technology, the application of lithium-ion batteries is becoming more and more extensive. People put forward higher requirements on the energy density of lithium-ion batteries. Under the existing lithium cobalt oxide graphite system, it is difficult to further improve the energy density of batteries. In order to further increase the energy density of the battery, it is necessary to replace the existing material system. For the anode, silicon-based materials are considered to be an ideal anode material to replace the current commercial graphite anode. [0003] Silicon-based materials are used as anodes. Due to their huge volume expansion, they are easy to fall off from the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/1395H01M4/62H01M4/38H01M4/48H01M4/131H01M4/134H01M10/0525H01M10/0562
CPCH01M4/1391H01M4/1395H01M4/131H01M4/134H01M4/628H01M4/625H01M10/0525H01M10/0562H01M4/386H01M4/483H01M2004/021H01M2004/027Y02E60/10
Inventor 于春辉魏飞张晨曦朱畅
Owner TSINGHUA UNIV
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