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Negative electrode material for batteries and method for preparing negative electrode material

A technology of negative electrode materials and positive electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of capacity decay, low electronic conductivity, and small diffusion speed of lithium ions, and achieve good capacity performance with a simple and easy method Effect

Inactive Publication Date: 2018-05-18
中核恒通(赤壁)环天新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

"Zero-strain" lithium titanate is expected to be used as an anode material for power batteries. 4+ / Ti 3+ The voltage of the redox pair relative to Li+ / Li is 1.5V, which does not reach the formation potential of the SEI film, which can avoid a certain irreversible capacity, and lithium titanate has a three-dimensional channel for the rapid transmission of lithium ions, and it also has a wide The charging and discharging platform does not form a passivation film on the surface, and its charging and discharging platform is very stable, but due to its low intrinsic electronic conductivity and the low diffusion rate of lithium ions, lithium titanate materials are charged and discharged at high rates and large currents. capacity fades quickly

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  • Negative electrode material for batteries and method for preparing negative electrode material

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Embodiment 1

[0028] This embodiment provides a negative electrode material for batteries, including a core structure and a shell structure. The core structure includes modified lithium titanate and modified TiNb with a mass ratio of 2:1. 2 o 7 , modified lithium titanate is lithium titanate doped with silver, modified TiNb 2 o 7 TiNb modified with carbon nanotubes 2 o 7 ; The shell structure is a carbon layer.

[0029] The particle size of the core structure is 1 μm-15 μm. The thickness of the shell structure is 500nm-3μm. In the modified lithium titanate, the mass percentage of silver is 1%. Modified TiNb 2 o 7 In, the mass percentage of carbon nanotubes is 10%, TiNb 2 o 7 has a porous structure, and TiNb 2 o 7 intertwined with carbon nanotubes.

[0030] Its preparation method at least includes the following steps:

[0031] The first step, the preparation of modified lithium titanate: titanium dioxide, lithium carbonate and silver nitrate are added to the ball mill tank acco...

Embodiment 2

[0036] This embodiment provides a negative electrode material for batteries, including a core structure and a shell structure. The core structure includes modified lithium titanate and modified TiNb with a mass ratio of 1:2. 2 o 7 , modified lithium titanate is lithium titanate doped with silver, modified TiNb 2 o 7 TiNb modified with carbon nanotubes 2 o 7 ; The shell structure is a carbon layer.

[0037] The particle size of the core structure is 1 μm-15 μm. The thickness of the shell structure is 500nm-3μm. In the modified lithium titanate, the mass percentage of silver is 0.5%. Modified TiNb 2 o 7 In, the mass percentage of carbon nanotubes is 15%, TiNb 2 o 7 has a porous structure, and TiNb 2 o 7 intertwined with carbon nanotubes.

[0038] Its preparation method at least includes the following steps:

[0039] The first step, the preparation of modified lithium titanate: titanium dioxide, lithium carbonate and silver nitrate are added to the ball mill tank ac...

Embodiment 3

[0044] This embodiment provides a negative electrode material for batteries, including a core structure and a shell structure. The core structure includes modified lithium titanate and modified TiNb with a mass ratio of 1:4. 2 o 7 , modified lithium titanate is lithium titanate doped with silver, modified TiNb 2 o 7 TiNb modified with carbon nanotubes 2 o 7 ; The shell structure is a carbon layer.

[0045] The particle size of the core structure is 1 μm-15 μm. The thickness of the shell structure is 500nm-3μm. In the modified lithium titanate, the mass percentage of silver is 0.8%. Modified TiNb 2 o 7 In, the mass percentage of carbon nanotubes is 8%, TiNb 2 o 7 has a porous structure, and TiNb 2 o 7 intertwined with carbon nanotubes.

[0046] Its preparation method at least includes the following steps:

[0047] The first step, the preparation of modified lithium titanate: titanium dioxide, lithium carbonate and silver nitrate are added to the ball mill tank acc...

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Abstract

The invention belongs to the technical field of power batteries, and particularly relates to a negative electrode material for batteries. The negative electrode material comprises core structures andshell structures. The core structures comprise modified lithium titanate and modified TiNb2O7, a mass ratio of the modified lithium titanate to the modified TiNb2O7 is (0.1-10):1, the modified lithiumtitanate is silver-doped lithium titanate, the modified TiNb2O7 is TiNb2O7 modified by carbon nano-tubes, and the shell structures are carbon layers. Compared with the prior art, the negative electrode material has the advantage that the batteries with the negative electrode material are good in capacitive property, cycle performance and rate performance.

Description

technical field [0001] The invention belongs to the technical field of power batteries, and in particular relates to a battery negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in devices such as mobile phones, digital cameras and portable personal computers due to their excellent energy density, rate performance and long service life, and their application targets are shifting from small mobile devices to large electric vehicle batteries series (vehicle batteries for pure electric vehicles, hybrid electric vehicles, and plug-in hybrid electric vehicles) and energy storage systems. [0003] The negative electrode material is an important part of the lithium-ion battery, and it is required to be able to reversibly intercalate and extract lithium ions. The performance of the negative electrode material also determines the performance of the battery to a large extent. "Zero-strain" lithium titanate...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCH01M4/362Y02E60/10
Inventor 祝国安
Owner 中核恒通(赤壁)环天新能源有限公司
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