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High-safety lithium ion battery cathode material and its preparation method

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of lithium-ion battery safety performance degradation, insufficient space, short-circuit of lithium-ion batteries, etc., achieve excellent safety performance and improve conductivity , the effect of reducing the risk of lithium analysis

Active Publication Date: 2012-12-12
中创新航科技(江苏)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the reasons for the safety hazard of lithium-ion batteries is that lithium is deposited on the surface of the negative electrode material during the charging and discharging process of the lithium-ion battery. , low temperature, etc.), resulting in insufficient space to accommodate lithium ions, lithium ions will accumulate on the surface of the negative electrode to form dendrites, which will pierce the diaphragm and cause a short circuit in the lithium-ion battery, reducing the safety performance of the lithium-ion battery. Therefore, an effective solution The problem of dendrite piercing the separator is very important to improve the safety performance of lithium-ion batteries

Method used

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  • High-safety lithium ion battery cathode material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The high-safety lithium-ion battery negative electrode material provided by this embodiment is made through the following steps:

[0034] (1) Preparation of Al(OH) 3 sol

[0035] AlCl 3 Pyrolysis at 300°C to obtain basic aluminum chloride, then dissolve basic aluminum chloride with deionized water, filter to obtain the filtrate, the concentration of the filtrate is 0.1mol / L, and the mass percentage concentration of 50% is added to the filtrate polyethylene glycol solution, and then add ammonium chloride to the filtrate, and then react at 90 ° C to obtain Al(OH) 3 Sol; where AlCl 3 The quality of: the quality of polyethylene glycol in polyethylene glycol solution: the quality=1 of ammonium chloride: 0.3: 0.2;

[0036](2) Preparation of graphite / LiAlO 2 Composite powder

[0037] Al(OH) prepared by step (1) 3 Sol mixed with NaOH, LiOH, Al(OH) 3 Al(OH) in sol 3 , and the molar ratio of NaOH and LiOH: Al(OH) 3 :NaOH:LiOH=1:1:1.5; then react at 40°C to prepare LiAlO...

Embodiment 2

[0041] The high-safety lithium-ion battery negative electrode material provided by this embodiment is made through the following steps:

[0042] (1) Preparation of Al(OH) 3 sol

[0043] AlCl 3 Pyrolysis at 200°C to obtain basic aluminum chloride, then dissolve basic aluminum chloride with deionized water, filter to obtain the filtrate, the concentration of the filtrate is 1.0mol / L, and the mass percentage concentration of 20% is added to the filtrate The polyvinyl alcohol solution, and then add ammonium sulfate to the filtrate, and then react at 40 ° C to obtain Al(OH) 3 Sol; where AlCl 3 The quality of: the quality of polyvinyl alcohol in polyvinyl alcohol solution: the quality=1 of ammonium sulfate: 0.1: 0.5;

[0044] (2) Preparation of graphite / LiAlO 2 Composite powder

[0045] Al(OH) prepared by step (1) 3 Sol mixed with NaOH, LiOH, Al(OH) 3 Al(OH) in sol 3 , and the molar ratio of NaOH and LiOH: Al(OH) 3 :NaOH:LiOH=1:1.5:1; then react at 90°C to prepare LiAlO 2...

experiment example

[0049] Graphite / LiAlO prepared with embodiment 1 2 / Carbon nanotubes are used as the negative electrode material, lithium iron phosphate is used as the positive electrode material, and 1.0mol / L LiPF is used 6 / EC+DEC(V EC :V DEC =1:1) (EC: ethylene carbonate, ethylene carbonate; DEC: diethyl carbonate, diethyl carbonate) as the electrolyte, the U.S. Celgard 2300 as the diaphragm, prepared a 40AH lithium-ion battery (battery a), and then The battery is overcharged (due to battery overcharging, lithium ions in the positive electrode material will accumulate rapidly on the surface of the negative electrode, causing lithium to be deposited on the surface of the negative electrode, causing the battery to be unsafe), and then the battery is dissected to observe the lithium ion on the surface of the negative electrode material. And under the same conditions, the battery (battery b) prepared by the normal negative electrode material was overcharged and tested, and then its battery ...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and concretely discloses a high-safety lithium ion battery cathode material and its preparation method. The preparation method of the high-safety lithium ion battery cathode material comprises the following steps: reacting an Al(OH)3 sol with NaOH and LiOH at 40-90DEG C to prepare LiAlO2, mixing graphite with the LiAlO2, adjusting the pH value, heating to 500-800DEG C to remove organic compounds and water, and grinding to obtain graphite / LiAlO2 composite powder; and putting the graphite / LiAlO2 composite powder under an iron catalyst in a quartz tube to prepare an LiAlO2 / carbon nanotube composite material, and ball-milling to obtain the high-safety lithium ion battery cathode material. The high-safety lithium ion battery cathode material provided by the invention has an excellent safety performance, and is especially suitable for large capacity and high rate lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-safety lithium-ion battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of energy storage battery developed in recent years. It has attracted people's attention for its advantages of long cycle life, stable working voltage platform, low price and no pollution. It has been widely used in electric vehicles, wind energy storage, etc. Energy, mobile power station and other fields. [0003] One of the bottlenecks currently restricting the development of lithium-ion batteries is the safety performance of batteries. Currently, measures for improving the safety performance of lithium-ion batteries are mainly divided into two types, namely external measures and internal measures. External measures are mainly achieved by adding a battery safety valve to the seal of the lithium-ion batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 赵晓锋原东甲徐雪菲杨晓伟张兵兵
Owner 中创新航科技(江苏)有限公司
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