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Lithium ion battery lithium titanium oxide cathode material and preparation method

A lithium-titanium oxide and lithium-ion battery technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of low specific capacity, capacity loss, and poor high-rate charge-discharge performance of lithium-titanium oxide compounds , to achieve the effects of improving electrochemical performance, capacity retention rate and cycle performance

Inactive Publication Date: 2014-07-23
傅汝毅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although compared with metal lithium, carbon materials have improved in terms of safety and cycle performance, but there are still many disadvantages: when charging and discharging for the first time, a passivation film is formed on the surface of carbon, resulting in capacity loss; The potential is similar to that of lithium. When the battery is overcharged, metal lithium may still precipitate on the surface of the carbon electrode to form dendrite lithium, causing a short circuit and causing safety problems; there is obvious voltage hysteresis; the preparation process is relatively complicated and there may be High temperature out of control, etc.
Spinel-type lithium titanium oxide Li 4 Ti 5 o 12 The anode material has a capacity of 175 mAh·g -1 The theoretical capacity and relatively high electrode voltage, wide source of raw materials, cheap, easy to prepare, no environmental pollution, and it can maintain a high degree of stability in the crystal structure in the process of lithium ion intercalation and extraction, so it has excellent cycle performance And stable discharge voltage, has the reputation of "zero strain", but the specific capacity of lithium titanium oxide compound is relatively low, the conductivity is poor, the discharge voltage when used as the negative electrode material of lithium ion battery is high, and the battery output voltage is low; and During the high-temperature synthesis process, the particle growth is not easy to control, and the tap density is low, resulting in low volume specific capacity and energy density; moreover, lithium titanium oxide compound itself is an insulator, and its electronic conductivity and ion conductivity are very low, leading to its first Loss of irreversible capacity and poor high-rate charge-discharge performance

Method used

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  • Lithium ion battery lithium titanium oxide cathode material and preparation method
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Experimental program
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Effect test

Embodiment 1

[0019] Will Li 2 CO 3 、TiO 2 Put it in a mortar with sucrose, add an appropriate amount of absolute ethanol as a dispersant and grind for 2.5 hours, mix well, dry at 85 °C, and sieve through a 325-mesh sieve after drying. The sieved mixture was placed in a muffle furnace and heated to 700°C for 5 hours in an air atmosphere, then heated to 850°C and sintered in an air atmosphere for 24 hours. After cooling naturally to room temperature, the mixture was pulverized, ground, and used Sieve through a 325-mesh sieve and place in a dry place to complete the preparation of the negative electrode material.

[0020] The mass fractions of sucrose were 5%, 8%, and 12%, respectively.

[0021] figure 1 It is the XRD comparison diagram of the doped sucrose mass fractions of 5% (Z1), 8% (Z2), 12% (Z3) and the standard spectrum of pure phase lithium titanium oxide. It can be obtained from the figure that all the diffraction peaks of the product are consistent with The standard card is con...

Embodiment 2

[0024] Will Li 2 CO 3 、TiO 2 Put it in a mortar with asphalt, add an appropriate amount of absolute ethanol as a dispersant and grind for 2.5 hours, mix well, dry at 85 °C, and sieve through a 325-mesh sieve after drying. The sieved mixture was placed in a muffle furnace and heated to 700°C for 5 hours in an air atmosphere, then heated to 850°C and sintered in an air atmosphere for 24 hours. After cooling naturally to room temperature, the mixture was pulverized, ground, and used Sieve through a 325-mesh sieve and place in a dry place to complete the preparation of the negative electrode material.

[0025] The mass fractions of asphalt were 3%, 5%, 8%, and 15%, respectively.

[0026] figure 1 It is the XRD comparison diagram of the standard spectrum of the pure phase lithium titanium oxide with the mass fraction of doped pitch of 3% (L1), 5% (L2), 8% (L3), 15% (L4), respectively. It can be obtained from the figure, All the diffraction peaks of the product are consistent w...

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Abstract

The invention discloses a lithium ion battery lithium titanium oxide cathode material and a preparation method. The raw materials comprise Li2CO3, TiO2 and a carbon source; the preparation method comprises the following steps: placing the raw materials in a mortar and adding a proper amount of absolute ethyl alcohol for grinding for 2.5 hours; uniformly mixing and drying under the temperature of 85 DEG C, drying and sieving by a sample screen; placing the screened mixture in a muffle furnace and heating in air atmosphere to the temperature of 700 DEG C and pre-burning for 5 hours, then heating to the temperature of 850 DEG C and sintering and insulating for 24 hours in air atmosphere, naturally cooling to room temperature; crushing and grinding the mixture, sieving by the sample screen, and placing at a drying place to complete the preparation of the cathode material. Carbon doping is carried out on the lithium titanium oxide, so that the electrochemistry performance of the lithium titanium oxide cathode material is effectively improved, cycle performance is improved, charge and discharge efficiency is high, and the capacity conservation rate is greatly increased.

Description

technical field [0001] The invention relates to the field of battery manufacturing, in particular to a lithium-titanium oxide negative electrode material for a lithium-ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have unique advantages such as high specific energy, high working voltage, wide application temperature range, low self-discharge rate, long cycle life, no pollution, and good safety performance. Power supplies for portable computers, video cameras, cameras, etc., and have gradually replaced traditional power supplies in the fields of aviation, aerospace, navigation, artificial satellites, small medical instruments and military communication equipment. The key to the successful application of lithium-ion batteries lies in the preparation of reversible anode materials for intercalating and deintercalating lithium ions. At present, commercial lithium-ion batteries mostly use graphite and other lithium-intercalated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCH01M4/485H01M4/625H01M10/0525Y02E60/10
Inventor 傅汝毅
Owner 傅汝毅