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Negative electrode active material and use of secondary lithium battery

A negative electrode active material, secondary lithium battery technology, applied in battery electrodes, active material electrodes, circuits, etc., can solve the problems of high delithiation potential, poor cycle performance of negative electrode active materials, low Coulombic efficiency, etc., to avoid growth and Decomposition and irreversible capacity loss reduction effect

Active Publication Date: 2005-10-12
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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  • Abstract
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Problems solved by technology

[0009] The purpose of the present invention is to overcome the defects of existing negative electrode active materials; overcome the poor cycle performance of some negative electrode active materials, some are low reversible capacity, some are high delithiation potential or low coulombic efficiency; thus providing A negative electrode active material for secondary lithium batteries that can make secondary lithium batteries have higher charge and discharge capacity, better cycle characteristics, and safety, and its use

Method used

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  • Negative electrode active material and use of secondary lithium battery
  • Negative electrode active material and use of secondary lithium battery
  • Negative electrode active material and use of secondary lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0075] Embodiment 1, using mechanical method to prepare the negative electrode active material containing chromium oxide

[0076] (1) The dried commodity Cr 2 o 3 (irregular geometric shape, particle size is 100 nanometers to 20 microns) mixed with carbon black (average particle size is 40 nanometers) as a conductive additive in a weight ratio of 10:1, mechanical ball milling (rotating speed is 500 rpm, 6 hours ) to obtain internal composite particles; (2) mechanically mill the internal composite particles and sucrose in a weight ratio of 1:1 (rotating speed is 150 rpm, 1 hour) to obtain a uniformly dispersed mixture; (3) the mixture , pyrolyzed under high-purity nitrogen, the pyrolysis steps are: first use 4 hours to raise the temperature from room temperature to 400°C, then use 10 hours to raise the temperature from 400°C to 700°C, then keep the temperature at 700°C for 12 hours, and finally use 2 Hour down to room temperature, obtain the inner composite particle that has ...

Embodiment 2

[0084] Embodiment 2, use hydrothermal method to prepare the negative electrode active material II containing manganese oxide

[0085] (1) dry manganese oxide MnO (average particle diameter is 10 microns) is mixed with acetylene black (average particle diameter is 10 nanometers) as conductive additive by the weight ratio of 5: 1, after mechanical ball milling (rotating speed is 500 rev / / Minutes, 6 hours), the mixture is heat-treated under high-purity nitrogen. The steps of heat treatment are: first use 2 hours to raise the temperature from room temperature to 600 ° C, keep the temperature at 600 ° C for 1 hour, and then use 2 hours to cool down to room temperature to obtain a surface The internal composite particle covered with carbon layer; (2) put the internal composite particle into an autoclave, add 20% sucrose aqueous solution in advance in the autoclave, the filling degree is 80v%, the weight ratio of sucrose to internal composite particle 2:1, the reactor was heated at ...

Embodiment 3

[0088] Embodiment 3, use mechanical method to prepare negative active material III containing vanadium oxide

[0089] (1) The dried V 2 o 3 (average particle diameter is 50 microns) and the graphite powder (particle size is 20 microns) as conductive additive is mixed by the weight ratio of 20: 1, mechanical ball milling (rotating speed is 500 rev / mins, 6 hours), obtains inner composite particle; ( 2) mechanically milling the internal composite granules and water-soluble starch at a weight ratio of 20:0.25 (add a small amount of water during ball milling, the rotating speed is 150 rpm, 2 hours), and dry the evenly mixed mixture to remove water; (3 ) pyrolyzes the mixture under high-purity argon, and the steps of pyrolysis are as follows: first use 2 hours to heat up from room temperature to 300°C, then use 10 hours to heat up from 300°C to 500°C, and then keep the temperature at 500°C for 8 hours Finally, drop to room temperature with 2 hours to obtain the internal composite ...

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Abstract

The invention has a grain structure with an outer shell and several inner cores. The grain size is from 100 nanometers to 100 microns. The inner cores are compound grain that includes active substance and conducting additive. The outer shell is a carbon layer. The active substance takes 20-95wt% of total cathode active material, and is mixture of one or several transition metallic compound selected from silicon and lithium storage whose thermodynamic equilibrium potential is less than 1.5v. The cathode material can be made by using mechanical process or thermal method, and can be directly used as cathode material or used with other existing cathode material.

Description

technical field [0001] The invention relates to a negative electrode material for a lithium battery, in particular to a negative electrode active material for a secondary lithium battery and its use. Background technique [0002] Among the negative electrode active materials of the secondary lithium battery, the theoretical specific capacity of metal lithium is 3830mAh / g, so the energy density of the secondary lithium battery using metal lithium as the negative electrode active material is the highest. However, dendrite growth occurs in the negative electrode of the metal secondary lithium battery during charging and discharging, which causes the internal short circuit of the battery, causing the battery to burn or even explode. In order to improve its safety, from the early 1970s to the end of the 1980s, lithium alloys such as lithium aluminum, lithium silicon, lithium lead, lithium tin, and lithium cadmium were used to replace metallic lithium as negative electrode active ...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/36H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 李泓胡进黄学杰陈立泉
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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