Method for preparing laminated Li-Ni-Mn-O compoiste material and its application

A composite material, lithium-nickel-manganese-oxygen technology, is applied in the preparation of layered lithium-nickel-manganese-oxygen composite materials, and the application of layered lithium-nickel-manganese-oxygen composite materials in lithium-ion batteries can solve the problem that product performance indicators are difficult to control, The problems of uneven product composition and complex preparation process can achieve the effect of excellent cycle performance, excellent cycle performance and high reaction yield.

Inactive Publication Date: 2005-10-26
上海瀛正科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solid-phase method and microwave method are difficult to achieve uniform mixing of each element at the atomic level, and the composition of the final product is very heterogeneous, so the effect is very unsatisfactory
The preparation process of the sol-gel method is complicated, and the performance indicators of the final product are difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 291 grams and 400 grams of analytically pure nickel nitrate and manganese nitrate respectively, dissolve them in distilled water, make a 2mol / L mixed solution, and place them in a reaction pot. Then 100 grams of analytically pure sodium hydroxide was made into a 4mol / L solution. Mix sodium hydroxide and ammonia water in a ratio of 2:1. While heating and stirring the nickel-manganese mixed solution, slowly add the prepared mixed solution of sodium hydroxide and ammonia water, control the pH in the reaction pot to 12, and continue stirring until the reaction is complete. Then, the precipitate was filtered and dried in an oven at 150° C. for 5 hours to obtain a nickel-manganese composite precursor. 50 grams of this precursor and 20 grams of lithium carbonate were mixed and ground, and then placed in a box furnace at 650 ° C for 5 hours. After natural cooling, ball mill in a ball mill for 2 hours, and then place it in a box furnace for sintering at 900°C for 10 hour...

Embodiment 2

[0028] The lithium carbonate in the embodiment 1 is replaced with lithium hydroxide, and other process conditions and tests are consistent with the embodiment 1. The test results are shown in Table 1.

Embodiment 3

[0030] In the second stage of sintering, 950°C was used instead of 900°C in Example 1, and the synthesis time was 8 hours. Other process conditions were consistent with Example 1. The test results are shown in Table 1.

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PUM

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Abstract

This invention relates to a preparation method for a laminar composite of LiNiMnO and the application in Li ionic battery. The method includes the following steps: 1, weighing soluble Ni salt and Mn salt to be solved in distilled water and matched to a mixed solution A 2, matching NaOH and ammonia water into solution B in the proportion of 2:1, 3, adding A, B in a reaction pot at the same time to form solution c, regulating its PH value to 11-13 and heating it, 4, filtering and drying the reacted material to get a precursor block D, 5, weighing Li salt in terms of the proportion of D and Li salt to be ground with D to get a mixture E 6, sintering E in two parts to get the final product.

Description

[technical field] [0001] The invention relates to the field of new energy technology. Specifically, it belongs to a method for preparing a layered lithium-nickel-manganese-oxygen composite material, and the application of the layered lithium-nickel-manganese-oxygen composite material synthesized by the method in lithium ion batteries. [Background technique] [0002] The cathode materials for lithium-ion batteries are now available with layered lithium cobalt oxide (LiCoO 2 ), lithium nickel oxide (LiNiO 2 ), spinel lithium manganese oxide (LiMn 2 o 4 ). Among these materials, LiCoO 2 Expensive and poor security. LiNiO 2 The advantage is that it has a higher specific capacity and is cheaper than lithium cobalt oxide. The disadvantage is that it is difficult to synthesize and has poor safety. LiMn 2 o 4 It has the advantages of abundant resources, low price, and good security, but its disadvantages are low capacity and fast capacity decay, which hinder its mass appli...

Claims

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Application Information

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IPC IPC(8): H01M4/04
CPCY02E60/12Y02E60/10
Inventor 徐刚王嘉罗国良郝振文
Owner 上海瀛正科技有限公司
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