Manufacturing method for high-voltage lithium ion anode material

A negative electrode material, lithium ion technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low conductivity of lithium metal oxide, poor rate performance of lithium titanate, low energy density of lithium titanate, etc. The effect of axial one-dimensional conductivity, poor conductivity, and reduced thickness expansion

Inactive Publication Date: 2015-09-16
田东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, some studies have achieved the purpose of fast charging by setting a number of regular small holes on the positive electrode sheet, but the actual application of this method consumes more materials and time; some studies have used lithium titanate, lithium metal oxide coated graphite, composite type Lithium metal oxide-coated graphite, graphite-coated lithium titanate and other materials are used as negative electrodes to achieve fast charging effects, but there are problems such as low energy density of lithium titanate and low conductivity of lithium metal oxide, while lithium titanate The rate performance is poor, the battery cell is easy to produce gas, and the high temperature performance is poor
And the current research on fast charging shows that the charging cut-off voltage of the battery cell is only 4.2V, and the energy density is low.

Method used

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  • Manufacturing method for high-voltage lithium ion anode material

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Comparison scheme
Effect test

Embodiment 1

[0015] The ultrafine graphite accounts for 5% of the total weight of the graphite and the lithium titanate material, and is stirred with lithium titanate to make it fully mixed, and the stirring and mixing time is 3 hours, so that the graphite material is evenly wrapped on the surface of the lithium titanate; then at 1500 ℃ heat treatment for 1 hour, the lithium titanate material is melted and tightly wrapped in the center of the graphite particles, thereby forming a stable graphite coating layer; finally, carbon nanotubes are added in a proportion of 2% of the total weight of the negative electrode material, and the graphite coating The lithium titanate material was ball-milled for 8 hours to obtain a lithium titanate / graphite / conducting agent three-layer negative electrode material.

Embodiment 2

[0017] The ultrafine graphite accounts for 1% of the total weight of the graphite and the lithium titanate material, and is stirred with lithium titanate to make it fully mixed, and the stirring and mixing time is 5 hours, so that the graphite material is evenly wrapped on the surface of the lithium titanate; then at 1800 Heat treatment at ℃ for 1 hour to melt the lithium titanate material and tightly wrap it in the center of the graphite particles, thereby forming a stable graphite coating layer; finally, add vapor-grown carbon fibers in the proportion of 1% of the total weight of the negative electrode material, and the graphite coating The lithium titanate material was ball-milled for 24 hours to obtain a lithium titanate / graphite / conducting agent three-layer negative electrode material.

Embodiment 3

[0019] The ultrafine graphite accounts for 10% of the total weight of graphite and lithium titanate material, and is stirred with lithium titanate to make it fully mixed, and the stirring and mixing time is 5 hours, so that the graphite material is evenly wrapped on the surface of lithium titanate; then at 1600 ℃ heat treatment for 1 hour, the lithium titanate material is melted and tightly wrapped in the center of the graphite particles, thereby forming a stable graphite coating layer; finally, carbon nanotubes are added in a proportion of 5% of the total weight of the negative electrode material, and the graphite coating The lithium titanate material was ball-milled for 20 hours to obtain a lithium titanate / graphite / conducting agent three-layer negative electrode material.

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Abstract

The invention provides a manufacturing method for a high-voltage lithium ion anode material. A lithium battery manufactured with the preparation method can be quickly recharged and discharged, and the recharging cut-off voltage is increased to 4.35V, so that the energy density of the lithium battery is greatly increased. The anode material manufactured with the manufacturing method takes lithium titanate as a core, the surface of lithium titanate is uniformly coated with a layer of graphite, and the surfaces of lithium titanate particles coated with the graphite are further coated with a layer of conductive agent, as a result, a lithium titanate-graphite-conductive agent three-layer composite structure is formed. The manufactured battery has very good performance of quick recharging and discharging and is greatly improved in high and low temperature performance and safety.

Description

technical field [0001] The invention relates to the field of lithium battery negative electrode materials, in particular to a preparation method of a fast chargeable high voltage lithium ion battery negative electrode material. Background technique [0002] Lithium-ion batteries have the characteristics of high specific capacity, small self-discharge, wide operating temperature range, high voltage platform, long cycle life, no memory effect, and environmental friendliness. They have been widely used in mobile phones, notebook computers, power tools and other fields. And gradually promote in the field of electric vehicles. At present, Beijing, Tianjin, Shenzhen, Shanghai and other important cities in China have built charging stations for hybrid electric vehicles and pure electric vehicles. However, according to the current charging method of lithium batteries, electric vehicles often take 7-8 hours to charge at a time; while consumer electronic products such as mobile phone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62H01M4/139H01M10/0525
CPCH01M4/139H01M4/366H01M4/485H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 田东
Owner 田东
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