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Preparation method of anode material for lithium ion batteries

A lithium-ion battery and negative electrode material technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems that high conductivity and high tap density cannot be achieved, and the stacking density does not play a big role, so as to achieve the optimization of electrochemistry Performance, reduction of volatilization, effect of increasing contact area

Inactive Publication Date: 2017-09-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently, spinel-type lithium titanate (Li 4 Ti 5 0 12 ) negative electrode materials have done a lot of research work, but the material still has the problem of not being able to achieve the unity of high conductivity and high tap density
This is closely related to the structure and preparation method of the material. In Li 4 Ti 5 0 12 In the preparation process of negative electrode materials, the traditional solid-state reaction method and sol-gel method are mainly used at present. These methods can prepare nano-Li 4 Ti 5 0 12 particles, by reducing the Li + Diffusion pathways to improve conductivity; but do not do much to address packing density

Method used

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  • Preparation method of anode material for lithium ion batteries
  • Preparation method of anode material for lithium ion batteries
  • Preparation method of anode material for lithium ion batteries

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Experimental program
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Effect test

Embodiment 1

[0021] The synthetic method of lithium-ion battery negative electrode material described in the present embodiment specifically comprises the following steps:

[0022] (1) At room temperature, make a mixed solution of butyl titanate, terephthalic acid, methanol and dimethylformamide according to the molar ratio of 1:2:15:60, and mechanically stir and ultrasonically vibrate for a long enough time Time to mix the medicines evenly.

[0023] (2) Transfer the homogeneously mixed solution in (1) to a polytetrafluoroethylene-lined autoclave whose temperature has risen to 150°C, and keep it for 12 hours to obtain MOFs (MIL-125@Ti) .

[0024] (3) Suction filter the turbid liquid obtained from the reaction in (2), then vacuum-dry the obtained filter cake overnight at a temperature above 80 degrees Celsius, and finally grind the dried product with an agate mortar until it passes through a 300-mesh sieve.

[0025] (4) Calcinate the ground powder in (3) at 380°C for 4 hours in the air to...

Embodiment 2

[0029] (1) At room temperature, make a mixed solution of n-butyl titanate, formic acid, diaminoterephthalic acid and dimethylformamide in a molar ratio of 1:1.5:20:60, and mechanically stir and ultrasonically vibrate long enough for the medicines in it to mix well.

[0030] (2) Transfer the homogeneously mixed solution in (1) to a polytetrafluoroethylene-lined autoclave whose temperature has risen to 120 ° C, and keep it for 24 hours to obtain MOFs (MIL-125-NH 2 @Ti).

[0031] (3) Suction filter the turbid liquid obtained from the reaction in (2), then vacuum-dry the obtained filter cake overnight at a temperature above 80 degrees Celsius, and finally grind the dried product with an agate mortar until it passes through a 300-mesh sieve.

[0032] (4) Calcinate the ground powder in (3) at 480°C for 2 hours in the air to obtain porous titanium dioxide (TiO 2 ).

[0033] (5) The ground TiO in (4) 2 The powder and the lithium source are mixed well and evenly at a molar ratio of...

Embodiment 3

[0036] (1) At room temperature, make a mixed solution of isopropyl titanate, methanol, terephthalic acid and dimethylformamide in a molar ratio of 1:1.5:25:60, and mechanically stir and ultrasonically vibrate for a long enough time time to mix the medicines evenly.

[0037] (2) Transfer the homogeneously mixed solution in (1) to a polytetrafluoroethylene-lined autoclave whose temperature has risen to 120°C, and keep it for 36 hours to obtain MOFs (MIL-125@Ti) .

[0038] (3) Suction filter the turbid liquid obtained from the reaction in (2), then vacuum-dry the obtained filter cake overnight at a temperature above 80 degrees Celsius, and finally grind the dried product with an agate mortar until it passes through a 300-mesh sieve.

[0039] (4) Calcinate the ground powder in (3) at 580°C for 2 hours in the air to obtain porous titanium dioxide (TiO 2 ).

[0040] (5) The ground TiO in (4) 2 The powder and the lithium source are mixed well and evenly at a molar ratio of 0.8:1,...

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Abstract

The invention discloses a preparation method of an anode material for lithium ion batteries, and belongs to the technical field of new energy lithium battery anode materials. The method disclosed by the invention comprises the following steps: uniformly mixing a template, an organic solvent, a ligand and an organic titanium salt, then transferring the solution into a high-pressure reaction kettle, using a solvothermal method, under high temperature and high voltage and in the organic solvent, self-assembling the organic titanium salt and the ligand into a metal organic skeleton material (MOFs) under the effect of the template, then after uniformly mixing the obtained product and a lithium source in a certain proportion, and putting the mixture in a resistance furnace for burning in certain conditions so as to obtain the anode material (Li4Ti5O12). The Li4Ti5O12 prepared by the method disclosed by the invention is a zero-strain material with extremely small strain, and the volume change of the battery in extremely high and low temperature conditions and in internal reaction of the battery is extremely small, so that the anode material has excellent high and low temperature performance and recycle performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery negative electrode material, and belongs to the technical field of new energy lithium battery negative electrode materials. Background technique [0002] In recent years, due to its excellent performance such as good power characteristics, low price, long cycle life, safety and stability, the development of lithium-ion batteries has been highly valued by all parties. Anode materials play a pivotal role in lithium-ion batteries, spinel-type lithium titanate (Li 4 Ti 5 0 12 ) as a negative electrode material for lithium-ion batteries has obvious advantages: it is a stress-free insertion material, which hardly changes in structure during charging and discharging, and has good cycle performance; has a good charging and discharging platform; does not react with electrolyte; price Inexpensive and easy to prepare. Compared with commercial carbon negative electrode materials, it usual...

Claims

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Application Information

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IPC IPC(8): C01G23/00H01M4/485H01M10/0525
CPCH01M4/485H01M10/0525C01G23/005H01M2004/027C01P2006/40C01P2002/72Y02E60/10
Inventor 张正富吴天涯徐顺涛孙冬王梓
Owner KUNMING UNIV OF SCI & TECH
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