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Preparation method of lithium ion battery negative electrode material li4ti5o12

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as uneven electrochemical properties of ion battery materials

Inactive Publication Date: 2011-12-21
HARBIN YUANFANG NEW ENERGY VEHICLE POWER BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the invention is in order to solve the problem of existing preparation Li 4 Ti 5 o 12 In order to solve the problems of inhomogeneity and poor electrochemical performance of ion battery materials, a lithium ion battery anode material Li 4 Ti 5 o 12 preparation method

Method used

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  • Preparation method of lithium ion battery negative electrode material li4ti5o12
  • Preparation method of lithium ion battery negative electrode material li4ti5o12
  • Preparation method of lithium ion battery negative electrode material li4ti5o12

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specific Embodiment approach 1

[0009] Specific implementation mode 1: Li-ion battery anode material Li in this implementation mode 4 Ti 5 O 12 The preparation method is as follows: 1. Mix tetrabutyl titanate and absolute ethanol solution according to the volume ratio of 1:5 to form solution A; 2. Dissolve lithium salt in distilled water to form solution B; 3. Mix solution B Pour into solution A while stirring to form a suspension, and the molar ratio of Li element to Ti element in the suspension is 4 to 6:5; 4. Heat the suspension in a water bath at 40°C to 100°C, steam Dry to obtain a precipitate; 5. After the precipitate is ground into powder, transfer it to a tube furnace, and sinter at 600°C-800°C for 2h-16h to obtain Li-ion battery negative electrode material Li 4 Ti 5 O 12 .

[0010] Li synthesized in this embodiment 4 Ti 5 O 12 The crystalline particles are uniform; charge and discharge tests show that the prepared Li 4 Ti 5 O 12 With higher initial discharge specific capacity and capacity...

specific Embodiment approach 2

[0011] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the lithium salt described in step two is LiOH·H 2 O, LiF, Li 2 CO 3 、LiCH 3 COO·H 2 O and LiNO 3 one or a combination of several of them. Others are the same as in the first embodiment.

[0012] When the lithium salt described in this embodiment is a composition, the various components are in any ratio.

specific Embodiment approach 3

[0013] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the sintering atmosphere in Step 5 is air, ammonia decomposition gas, argon, nitrogen or hydrogen-argon mixed gas, wherein the hydrogen-argon mixed gas The mixing ratio of hydrogen and argon is arbitrary. Others are the same as those in the first or second embodiment.

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Abstract

The invention discloses a preparation method of lithium ion battery negative electrode material Li4Ti5O12, which relates to a preparation method of battery negative electrode material. The invention solves the problems of inhomogeneity and poor electrochemical performance of the Li4Ti5O12 ion battery materials prepared in the prior art. The preparation method is as follows: 1. Prepare solution A; 2. Prepare solution B; 3. Pour solution B into solution A while stirring to form a suspension; 4. Evaporate the suspension to dryness to obtain a precipitate. After being ground into powder, it is transferred to a tube furnace and sintered to obtain Li4Ti5O12, a negative electrode material for lithium ion batteries. The synthesized Li4Ti5O12 crystalline particles of the present invention are uniform; charge and discharge tests show that the prepared Li4Ti5O12 has a higher initial discharge specific capacity and capacity retention rate, and the first discharge specific capacity of the prepared Li4Ti5O12 electrode is 140mAh g-1. After 50 cycles, the capacity The retention rate is not less than 97%.

Description

technical field [0001] The invention relates to a preparation method of battery negative electrode material. Background technique [0002] Li spinel structure 4 Ti 5 O 12 As a new type of anode material for lithium-ion batteries, Li 4 Ti 5 O 12 It is a spinel structure, its space group is Fd-3m, a part of lithium ions are located at the 8a position, the rest of the lithium ions and titanium ions (atomic ratio 1:5) occupy 16d, and the oxygen atom is located at 32e, and its structural formula is [Li] 8a [Li 1 / 3 Ti 5 / 3 ] 16d [O 4 ] 32e , The theoretical capacity is 175mAh / g. The study found that regardless of Li + Whether the ion is intercalated or extracted, the XRD spectrum of the material has almost no change, indicating that the battery material has little change in lattice constant and volume change (less than 1%) in the charge state and discharge state. Good zero-strain material, which makes Li in chemical power sources 4 Ti 5 O 12 The electrodes can still...

Claims

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Application Information

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IPC IPC(8): C01G23/00H01M4/1391
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 车向路程远志戴长松陈振宇王娜刘正
Owner HARBIN YUANFANG NEW ENERGY VEHICLE POWER BATTERY
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