Method for making negative electrode material of lithium ion cell

A technology for lithium-ion batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, active material electrodes, etc., can solve problems such as low reversible capacity and poor safety, and achieve cost reduction, oxidation prevention, and good results

Inactive Publication Date: 2005-12-07
潘树明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the problems of using carbon and natural graphite as negative electrode materials are poor safety, low reversible capacity and compatibility with electrolyte.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Insert 1000g of amorphous silicon (purity 99.99%) into a cleaned high-energy ball mill, fill it with high-purity (greater than 99.99%) argon (Ar) gas protection and anti-oxidation, in a high-speed ball mill with a rotating speed of 650 rpm Grinding, shut down every 20 hours and take samples to measure the particle size until the grinding reaches 80nm. Then put the hard carbon in the following ratio: C 0.82 Si 0.18 , then add 0.01% La (0.1g) by weight percentage, add it to a high-energy ball mill, fill it with high-purity argon (Ar) gas, take a sample every 10 hours to check the particle size, stop the machine when it reaches 80nm, and take out the ground negative electrode material to make The negative plate is made into a simulated battery, and the initial reversible capacity of the test is 1156mAh / g, and it can reach 950mAh / g after 20 cycles.

Embodiment 2

[0037] Example 2: Put 1000g of polysilicon (purity 99.99%) into a clean high-energy ball mill. The following is the same as in Example 1. The initial reversible capacity reaches 1245mAh / g, and can reach 980mAg / g after 20 cycles.

Embodiment 3

[0038] Example 3: Put 1000g of monocrystalline silicon (purity 99.99%) into a clean high-energy ball mill, the same as in Example 1 below, the initial reversible capacity is measured to reach 1280mAh / g, and it may reach 1056mAh / g after 20 cycles.

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Abstract

A method for preparing negative pole material of lithium cell, which contains putting silicon, carbon, doped 0.01 % rareearth oxide La2O5 and Nd2O5 in high power ball mill, protected by Ar or N2 for preventing oxidation, the C : Si = 3 :1 -5 : 1, checking the abrading grain size every 20 hr until to 50-100nm to obtain high specific capacity and fine safety nano negative pole material.

Description

technical field [0001] The invention belongs to the field of energy technology, and in particular relates to a preparation method of a negative electrode material of a lithium ion battery. Background technique [0002] At present, known negative electrode materials for lithium ions include hard carbon, natural graphite, and mesocarbon microbeads. Different carbon materials have differences in microscopic morphology, surface functional groups, pore size, crystallinity, impurities, etc., and the relationship between their chemical properties, electrochemical behavior, and structural characteristics has been extensively and deeply studied. Considering that the increase of rhombohedral graphite content facilitates the intercalation of lithium ions. Lithium ions can occupy irregular positions on the phase interface, and due to the extremely slow intercalation, the electrochemical capacity can be greater than the theoretical capacity of graphite (372mAh / g). The electrode potenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04
CPCY02E60/10
Inventor 潘树明
Owner 潘树明
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