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Anode material for lithium ion battery with high power capacity and manufacturing method thereof

A technology for lithium ion batteries and cathode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of forming impurity phases, affecting the electrochemical performance of synthetic materials, and uneven composition of precursors, achieving low production costs, The spherical morphology is easy to control and the effect of high discharge capacity

Inactive Publication Date: 2012-01-25
SHENZHEN DANBANG INVESTMENT GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the high-capacity lithium-ion battery cathode material Li 4 / 3-x [Ni x mn 2 / 3-x co x ]O 2 The preparation of the composite transition metal ion is mostly prepared by first preparing the hydroxide precursor of the transition metal ion, and then roasting it with lithium to obtain the product, but due to the Mn(OH) 2 Instability, it is easily oxidized to trivalent MnOOH, and even oxidized to tetravalent MnO 2 , resulting in uneven composition of the precursor, leading to the formation of impurity phases during sintering, affecting the electrochemical performance of the synthesized material

Method used

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  • Anode material for lithium ion battery with high power capacity and manufacturing method thereof
  • Anode material for lithium ion battery with high power capacity and manufacturing method thereof
  • Anode material for lithium ion battery with high power capacity and manufacturing method thereof

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preparation example Construction

[0031] In one embodiment, the preparation method of high-capacity lithium-ion battery cathode material comprises the following steps:

[0032] 1) Dissolve soluble nickel, manganese, and cobalt compounds with a molar ratio of x:(2 / 3-x):x in water to prepare a mixed solution with a total concentration of metal ions of 0.5-3 mol / liter, where 0≤ x<1 / 3;

[0033] 2) Sodium carbonate is dissolved in water to prepare a solution with a concentration of 0.2-2 mol / liter;

[0034] 3) Using sodium carbonate as a precipitating agent and ammonia water to adjust the pH value, pouring excess sodium carbonate solution and ammonia water into the mixed solution in step 1) in parallel, stirring at the same time to form a precipitate;

[0035] 4) Filter, wash, and dry the precipitate to obtain a carbonate precipitation precursor; mix the carbonate precipitation precursor with a molar ratio of 1:(4 / 3-x) with lithium salt, and Milling in a ball milling medium for a period of time, then placing it i...

Embodiment 1

[0039] 29.074 grams of nickel nitrate hexahydrate, 29.102 grams of cobalt nitrate hexahydrate, and 86.109 grams of manganese nitrate hexahydrate were added to deionized water, and stirred evenly to form a mixed solution with a total volume of 500ml; then 35g of sodium carbonate was dissolved in deionized water, A solution with a volume of 500ml is formed; the sodium carbonate solution is added dropwise to the metal ion mixed solution, and ammonia water is added dropwise at the same time, and the pH value is controlled to be 8, and the solution is stirred while adding the solution, and the stirring speed is 100~1000 rpm, and the reaction time is 10 Hours, filtered, washed, and dried to obtain a carbonate precursor; mix the precursor with a molar ratio of 1:7 / 6 and lithium hydroxide, ball mill and dry it in acetone medium, and then put it into a muffle furnace. Carry out roasting, heat up to 800°C at a constant temperature for 24 hours at a heating rate of 1-60°C / min, and then co...

Embodiment 2

[0041] With 18.711 grams of nickel sulfate heptahydrate, 18.732 grams of cobalt sulfate heptahydrate, and 56.340 grams of manganese sulfate monohydrate, add deionized water, stir, and form a mixed solution with a total volume of 500ml; then 40g sodium carbonate is dissolved in deionized water, A solution with a volume of 400ml was formed; the sodium carbonate solution was added dropwise to the metal ion mixed solution, and ammonia water was added dropwise at the same time to control the pH value to 10. Stir while adding the solution dropwise, the stirring speed is 100-1000 rpm, the reaction is stirred for 20 hours, and the carbonate precursor is obtained by filtering, washing and drying. The precursor and lithium hydroxide with a molar ratio of 1:11 / 9 were mixed, ball-milled and dried in acetone medium, then put into a muffle furnace, roasted in air, and heated at a heating rate of 1-60 °C / min to 1000°C for 15 hours, then naturally cooled to room temperature to obtain Li 11 / 9...

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Abstract

The invention discloses a manufacturing method for an anode material for a lithium ion battery with a high power capacity. The method comprises the following steps of: 1) dissolving soluble nickel, manganese and cobalt compounds into water, thereby preparing a mixed solution with a total concentration of metal ions being 0.5-3 mol / L, wherein the mole ratio of nickel compound to manganese compound to cobalt compound is x: (2 / 3-x): x; 2) dissolving sodium carbonate into water and preparing into a solution with a concentration of 0.2-2 mol / L; 3) mixing a superfluous sodium carbonate solution and ammonia water and dropping into the mixed solution prepared in the step 1), mixing the solution and generating sediment; and 4) filtering, washing and drying the sediment, thereby acquiring a carbonate sediment precursor, and then mixing the carbonate sediment precursor with a lithium salt according to a molar ratio of 1: (4 / 3-x), roasting the acquired mixture for a period of time at a high temperature after ball-milling the acquired mixture for a period of time within a ball-milling medium, and cooling to room temperature, thereby acquiring Li(4 / 3-x)[NixMn(2 / 3-x)Cox]O2 series of materials, wherein x is more than or equal to 0 and is less than 1 / 3. An acquired product has the advantages that proportion of ingredients is stable, size distribution is uniform, consistency is excellent and specific capacity is more than 220mAh / g.

Description

technical field [0001] The invention relates to lithium-ion battery materials, in particular to a high-capacity lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] At present, the positive electrode materials of lithium-ion power batteries mainly use lithium manganese oxide, lithium iron phosphate or multi-element oxide positive electrode materials, among which spinel lithium manganese oxide has a higher voltage platform, good safety performance and low price, but The material has a low gram capacity (100-110mAh / g in actual batteries), poor high-temperature cycle stability and storage performance, and needs to be improved. At present, it is often mixed with other high-capacity positive electrode materials; lithium iron phosphate has high Safety performance and rich resources have attracted people's attention, but the material's conductivity, capacity, compaction density, coating performance, etc. have yet to be continuously de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 刘萍
Owner SHENZHEN DANBANG INVESTMENT GROUP