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Lithium titanate coated cathode and lithium ion battery using cathode

A lithium-ion battery and lithium titanate technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve problems such as poor wettability of electrolyte, loss of battery power characteristics, and low surface of nano-alumina materials. Achieve good electrolyte wettability, rate performance and cycle performance improvement

Inactive Publication Date: 2013-04-17
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The surface energy of the nano-alumina material is low. Compared with the conventional graphite negative plate, the dense ceramic coating formed by the nano-alumina particles has poorer wettability to the electrolyte, which leads to the electrolyte being more easily absorbed by the graphite layer in the alumina coating. Therefore, the retention rate of the alumina coating on the electrolyte is relatively low, so the battery power characteristics will be lost if the alumina coating is added.

Method used

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  • Lithium titanate coated cathode and lithium ion battery using cathode
  • Lithium titanate coated cathode and lithium ion battery using cathode
  • Lithium titanate coated cathode and lithium ion battery using cathode

Examples

Experimental program
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Effect test

Embodiment 1

[0038] (1) Slurry preparation for lithium titanate coating:

[0039] Prepare water-based glue with 1% CMC, 2.8% SBR and deionized water. Add 96.2% nano-lithium titanate into the glue, stir with a high-speed disperser, and disperse at a high speed for 3 hours at a shear rate of 2500 rpm to form a slurry with a solid content of 40%.

[0040](2) Preparation of positive electrode:

[0041] Dissolve 94% lithium cobaltate, 3% conductive agent and 3% polyvinylidene fluoride (PVDF) in N-methyl-2-pyrrolidone (NMP) to make positive electrode slurry. Coat the slurry on the aluminum foil, dry, roll, cut into 51×551mm, and weld the aluminum lug at one end.

[0042] (3) Preparation of negative electrode:

[0043] Dissolve graphite, 3% conductive agent and 4% PVDF in NMP to make negative electrode slurry. Coat the slurry on the copper foil, dry and roll. The lithium titanate slurry prepared in step 1 is coated on both sides of the negative electrode sheet by gravure coating, and then dr...

Embodiment 2

[0049] Prepare water-based glue with 3% CMC, 7% SBR and deionized water. Add 90% nano-lithium titanate into the glue, stir with a high-speed disperser, and disperse at a high speed for 3 hours at a shear rate of 2500rpm to form a slurry with a solid content of 40%. Other materials and parameters are the same as in Example 1.

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Abstract

The invention discloses a lithium titanate coated cathode and a lithium ion battery using the cathode. The lithium titanate coated cathode comprises a cathode piece and a lithium titanate coating, wherein the lithium titanate coating comprises the following components by weight ratio: 90-97% of nanomaterial and 3-10% of adhesive agent; the nanomaterial is nano lithium titanate, or a combination of nano lithium titanate and nano alumina and / or nano aluminium nitride; the adhesive agent is one of a combination of SBR (Styrene Butadiene Rubber) and CMC (Carboxyl Methyl Cellulose), PVDF (Polyvinylidene Fluoride), PVDF-HFP (Polyvinylidene Fluoride-Hexafluoropropylene), and polyacrylate; pulp of the lithium titanate coating comprises a solvent; the solvent is one of deionized water and NMP (N-Methyl Pyrrolidone); the solid content of the pulp of the lithium titanate coating is 20-60%; and the two sides of the cathode piece are coated with the pulp of the lithium titanate coating. The lithium ion battery using the lithium titanate coated cathode has better electrolyte wettability on the premise that a safety feature of the battery is unaffected, and can form a fully contacted liquid-phase interface with a diaphragm, and the multiplying power performance and the cycle performance of the battery can be improved.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium titanate surface-coated negative electrode and a lithium ion battery using the negative electrode. Background technique [0002] The power, cycle characteristics and safety of power batteries have always been the focus of product development. At the same time, with the multi-functional requirements of mobile communications and digital products, small batteries are also developing in the direction of high cycle life and high safety. [0003] In the prior art, in order to improve the safety of the battery, nano-ceramic alumina is coated on the surface of the positive electrode or the negative electrode to increase the surface resistance of the electrode sheet, which can block the transfer of heat when the battery is locally overheated, thereby playing the role of safety protection . [0004] The surface energy of the nano-alumina material is low. Compared with the conventional g...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/13H01M10/0525
CPCY02E60/10
Inventor 张越超张敏申津靖李爱红高秀玲
Owner TIANJIN ENERGIES
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