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Preparing method for negative material of high-capacity tin-base lithium ion battery

A technology for ion batteries and negative electrode materials, which is applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems that the volume effect cannot be completely eliminated, the requirements for equipment conditions are relatively high, and the preparation method is complicated, so as to reduce irreversible capacity and ease Effect of electrode volume change

Inactive Publication Date: 2006-05-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, most of the tin-containing alloy materials mentioned in the literature or patents cannot completely eliminate the volume effect caused by charging and discharging in theory, and a series of problems caused by this will be a problem during the use of the battery. Hidden danger
At the same time, the preparation methods of various materials containing metal elements and introducing other elements in the current patents are relatively complicated, or have relatively high requirements on equipment conditions, usually high-temperature solid-state reaction and high-energy ball milling, and the relative cost is relatively high.

Method used

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  • Preparing method for negative material of high-capacity tin-base lithium ion battery
  • Preparing method for negative material of high-capacity tin-base lithium ion battery

Examples

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Effect test

Embodiment 1

[0026] Preparation A solution: 0.07M SnCl 2 Solution 50ml, adding potassium sodium tartrate, the concentration is 0.2M, sucrose, the concentration is 0.01M; preparation B solution: 0.1M KBH 4 Solution 30ml, add ammonia water, ammonia concentration is 2M. Slowly add solution B to solution A dropwise while vigorously stirring solution A. After the dropwise addition was completed, the stirring was continued for 2 hours, during which the temperature was 25°C. The reaction solution was aged for 1 hour, and the resulting white precipitate was filtered, washed with deionized water until neutral, and dried at 90°C to obtain the product. Electrodes were prepared according to the method described above for electrochemical performance testing.

Embodiment 2

[0028] Preparation A solution: 0.07M SnCl 2 Solution 50ml, add sodium citrate to it, the concentration is 0.2M, add ethylene glycol 2ml; preparation B solution: 0.1M KBH4 Solution 30ml, which is added with urea, the concentration is 0.4M. Slowly add solution B to solution A dropwise while vigorously stirring solution A. After the dropwise addition was completed, the stirring was continued for 2 hours, during which the temperature was 65°C. The reaction solution was aged for 3 hours, and the resulting white precipitate was filtered, washed with deionized water until neutral, and dried at 90°C to obtain the product. Electrodes were prepared according to the method described above for electrochemical performance testing.

Embodiment 3

[0030] Formulation A: Solution 0.06M SnCl 2 Solution 50ml, add tartaric acid, the concentration is 0.2M, add ethylene glycol 1ml; preparation B solution: 0.07M KBH 4 Solution 30ml, wherein added ammonia water, ammonia concentration is 1M. Slowly add solution B to solution A dropwise while vigorously stirring solution A. After the dropwise addition was completed, the stirring was continued for 1.5 hours, during which the temperature was 45°C. The reaction solution was aged for 10 hours, and the resulting white precipitate was filtered, washed with deionized water until neutral, and dried at 90°C to obtain the product. Electrodes were prepared according to the method described above for electrochemical performance testing.

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Abstract

The producing method applies the normal temperature reactive solution SnCl2 as the solution, the ammonia as the precipitator, and the cabamide as the compound to supply the O-H, and the KBH4, NaH2PO2 as reducer. The catalyst and some compound complexing agent are also added. During the reaction procedure, the concentration of the reducer is to be controlled to keep definite ratio Sn, to reduce the irreversible capacity in the electrochemical lithium storage procedure. The material produced effectively remites the volume changing of the electrode resulted in the discharging process.

Description

technical field [0001] The invention relates to a method for preparing a high-capacity tin-based lithium-ion battery negative electrode material, in particular to a method for preparing a high-capacity tin-based lithium-ion battery negative electrode material suitable for various non-aqueous electrolyte lithium-ion secondary batteries. It belongs to the technical field of high-energy batteries. Background technique [0002] Lithium secondary batteries, which are used as the main power supply of mobile communication equipment and portable electronic equipment, have become a research hotspot at home and abroad due to their excellent performance such as high output voltage and high energy density. However, in a lithium secondary battery using lithium metal as the negative electrode material, dendrites are precipitated on the negative electrode during charging. As a result of repeated charge and discharge, the dendrites will break through the separator and reach the positive ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/38H01M4/66H01M4/02H01M10/40
CPCY02E60/10
Inventor 林克芝王晓琳徐艳辉
Owner TSINGHUA UNIV
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