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Method for preparing spinel lithium titanate
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A technology of composite lithium titanate and spinel, applied in electrode manufacturing, electrical components, battery electrodes, etc., can solve problems such as low energy density, low potential, and reduced research interest
Inactive Publication Date: 2009-10-28
XINXIANG ZHONGKE SCI&TECH
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Problems solved by technology
Among the currently commercialized or partially commercialized metaloxide electrode materials for lithium-ion batteries, lithium-titanium composite oxides Li 4 Ti 5 o 12 It can be used as a negative electrode material for lithium-ion batteries and has a spinel structure. It was studied as a positive electrode material for lithium-ion batteries in the late 1980s, but because it has a low potential relative to lithium and low energy density (theoretical capacity is 175mAh / g ), thus reducing research interest in
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Embodiment 1
[0006] [Example 1] Li 0.6 Ti 1.2 Cr 0.05 o 3 / w 0.1
[0008] A second treatment step, wherein the dried product obtained in the first treatment step is heat-treated at 300° C. for 12 hours.
[0009] The third processing step, wherein the heat-treated material obtained in the second processing step is mixed and ball-milled with glucose z=0.1 for 12 hours, then sintered at 750° C. under nitrogen protection for 12 hours, and cooled through a 300-mesh sieve.
Embodiment 2
[0010] [Example 2] Li 0.6 Ti 1.2 Cr 0.05 o 3 / w 0.2
[0011] The first treatment step, wherein the atomic ratio of lithium and titanium, that is, Li / Ti is a mixture of lithium hydroxide, metatitanic acid and zirconia y=0.1, mixed evenly, dispersed in acetonesolvent, ball milled for 18 hours, and dried .
[0012] A second treatment step, wherein the dried product obtained in the first treatment step is heat-treated at 500° C. for 16 hours.
[0013] The third processing step, wherein the heat-treated material obtained in the second processing step and furfural resin z=0.2 are mixed and ball-milled for 10 hours, then sintered at 800° C. under nitrogen protection for 18 hours, and then cooled through a 300-mesh sieve.
Embodiment 3
[0014] [Example 3] Li 0.6 Ti 1.2 Cr 0.05 o 3 / w 0.4
[0015] The first treatment step, wherein the atomic ratio of lithium and titanium, that is, Li / Ti is a mixture of lithium nitrate, titanium tetrachloride and zinc oxide y=0.2, mixed evenly, dispersed in an alcoholsolvent, ball milled for 24 hours, and dried .
[0016] A second treatment step, wherein the dried product obtained in the first treatment step is heat-treated at 600° C. for 24 hours.
[0017] The third processing step, wherein the heat-treated material obtained in the second processing step is mixed and ball-milled with pitch z=0.3 for 12 hours, then sintered at 900° C. under nitrogen protection for 12 hours, and cooled through a 300-mesh sieve.
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Abstract
A method for preparing the spinellithiumtitanate belongs to the field of the battery. The aim of the invention is to provide a method for preparing the spinellithiumtitanate. The essential point of the technical scheme of the invention is that the molecular formula of the spinellithiumtitanate is LixTi1.25-yMyO3 / wz according to the method for preparing the spinel lithium titanate. The method for preparing comprises the following steps: (1) after mixing a lithium source and a titanium source with the atomic ratio between lithium and titanium for 0.6-1 into an organic solvent for executing ball milling for 8-24 hours, drying; (2) executing heat treatment to the dried object prepared in the step (1) at the temperature of 300-600 DEG C for 10-24 hours, cooling by radiation; and (3) mixing and executing ball milling to the material obtained in the step (2) and the coating material for 8-24 hours, and after sintering under the protection of nitrogen in the temperature of 700-1000 DEG C for 10-24 hours, cooling and sieving for obtaining the spinel lithium titanate of the invention. The method of the invention is used for preparing the lithium cell.
Description
Technical field: [0001] The invention relates to a method for manufacturing an electrode composed of active materials, in particular to a method for preparing a spinel composite lithium titanate used as a negative electrode material for a lithium secondary battery. Background technique: [0002] The high specific energy, high voltage and low pollution characteristics of lithium-ion batteries make it a good power source for mobile phones, notebook computers and cameras, and it is also one of the important candidates for future electric vehicle power sources. Among the currently commercialized or partially commercialized metaloxideelectrode materials for lithium-ion batteries, lithium-titanium composite oxides Li 4 Ti 5 o 12 It can be used as a negative electrode material for lithium-ion batteries and has a spinel structure. It was studied as a positive electrode material for lithium-ion batteries in the late 1980s, but because it has a low potential relative to lithium an...
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