Pre-lithiated material and preparation thereof, precursor material, lithium battery negative electrode slurry and lithium battery

A technology of negative electrode slurry and pre-lithiation, which is applied to battery electrodes, secondary batteries, circuits, etc., to achieve high overall process safety and solve complex process effects

Active Publication Date: 2021-04-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method for preparing a pre-lithiated material to solve the problems in the above-mentioned pre-lithiated preparation process in the prior art

Method used

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  • Pre-lithiated material and preparation thereof, precursor material, lithium battery negative electrode slurry and lithium battery
  • Pre-lithiated material and preparation thereof, precursor material, lithium battery negative electrode slurry and lithium battery
  • Pre-lithiated material and preparation thereof, precursor material, lithium battery negative electrode slurry and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Embodiment 1 Precursor material shell material test

[0080] Precursor material: Si is the core, the core size is 200nm, and the shell size is 100nm. Different shell materials are selected respectively, and the corresponding pre-lithiated materials are prepared according to the pre-lithiated material preparation process recorded in Experiment 1. According to Experiment 2 The shell performance test process of the precursor described in , tests each shell material, and the results are as follows (see Table 1).

[0081] Table 1

[0082]

[0083]

[0084] Only materials with a low lithium ion diffusion coefficient at room temperature and a sharp change in the lithium ion diffusion coefficient under high temperature or high potential conditions can become a protective shell material. In this way, lithium ions cannot escape after the material is prepared. At the same time, we also examined the strength of the shell, because the core will expand to a certain extent aft...

Embodiment 2

[0088] Example 2 Precursor material core material test

[0089] Precursor material: the core size is 200nm, the shell size is 100nm, the shell material is SiC, the selection of the core material is shown in Table 2, and the corresponding pre-lithiation material is prepared according to the pre-lithiation material preparation process recorded in Experiment 1, according to The pre-lithiation material performance test process described in Experiment 3 tested different core materials, and the results are as follows (see Table 2).

[0090] Table 2

[0091] Si@SiC S@SiC Fe@SiC W@SiC Sn@SiC Hollow@SiC Discharge capacitymAh / g 2689 1234 567 431 987 300 Delithiation potential V 0.41 1.8 1.2 1.4 0.8 0 Charging capacitymAh / g 2890 1349 786 543 1026 680 First cycle Coulombic efficiency% 107 109 138 126 104 227

[0092] According to the test results in Table 2, it can be seen that selecting a suitable shell can enable lit...

Embodiment 3

[0095] Example 3 Precursor material core / shell size test

[0096] Precursor material: the core material is Si, the shell material is SiC, the size selection of the core and the shell is shown in Table 3, and the corresponding pre-lithiated material is prepared according to the pre-lithiated material preparation process recorded in Experiment 1, and the experiment is carried out according to Experiment 2 The performance test results corresponding to the core and shell sizes are as follows (see Table 3).

[0097] table 3

[0098] 1 2 3 4 5 6 kernel size 10um 10um 10um 10um 10um 10um shell thickness 2nm 50nm 500nm 20um 50um 100um Discharge capacitymAh / g 856 832 810 730 540 430 7 8 9 10 11 12 kernel size 2nm 50nm 500nm 20um 50um 100um shell thickness 10um 10um 10um 10um 10um 10um Test Results 143 324 432 543 632 870

[0099] According to the test results in Tab...

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a preparation method of a pre-lithiated material. The method comprises the following steps: mixing a precursor material with a lithium source to form a mixture, wherein the precursor material comprises an inner core and a shell coating the inner core, the inner core is used for storing lithium or lithium ions, and the shell is used for protecting the inner core; sequentially sintering and cooling the mixture under the protection of an inert atmosphere to obtain a sintered product; and carrying out lithium removal treatment on the outer surface of the sintered product to obtain the pre-lithiated material. The whole process does not need to adopt an organic solvent to heat and melt the lithium source, is environment-friendly, and is simple and easy to operate. The pre-lithiation process has low requirements on the environment, and the whole process is high in safety. The invention also provides a precursor material, a pre-lithiated material, lithium battery negative electrode slurry and a lithium battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a pre-lithiation material and its preparation, a precursor material, a lithium battery negative electrode slurry and a lithium battery. Background technique [0002] Due to its high energy density, long cycle life, good safety, and no memory effect, lithium-ion batteries have been successfully used in the field of mobile power as the main energy storage device. In order to further satisfy the use of lithium-ion batteries in high-power scenarios such as electric vehicles and smart grids, it is necessary to further improve the safety and energy density of lithium-ion batteries. [0003] In the current lithium-ion battery system, the negative electrode material will generate an irreversible SEI during the first cycle of discharge, so that a part of the lithium ions will be irreversibly consumed in the first cycle, thus reducing the energy density of the lithium-ion battery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/40H01M4/587H01M4/62H01M10/0525
CPCY02E60/10
Inventor 于春辉魏飞张晨曦林贤清张迪肖哲熙朱畅
Owner TSINGHUA UNIV
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