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A method for preparing sphericity manganic acid lithium cell anode active material

A spherical lithium manganate, battery cathode technology, applied in battery electrodes, manganate/permanganate, circuits, etc., can solve problems such as poor battery performance, and achieve stable battery performance, uniform particle size, and good cycle performance. Effect

Inactive Publication Date: 2008-04-16
BYD CO LTD
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Problems solved by technology

Usually, LiMn 2 o 4 Due to the different particle sizes, various properties are different. Large particle size lithium manganate can obtain better cycle performance, and small particle size lithium manganate can obtain larger mass specific capacity. Therefore, lithium manganate with different particle sizes can be obtained. Prepare battery materials with corresponding performance, and the battery performance obtained by lithium manganate with uneven particle size is poor

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  • A method for preparing sphericity manganic acid lithium cell anode active material
  • A method for preparing sphericity manganic acid lithium cell anode active material

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[0009] According to the preparation method of lithium manganese oxide battery positive electrode material of the present invention, the method comprises that spherical manganese carbonate is calcined at 300-800 DEG C for 2-15 hours in the presence of oxidizing gas, then mixed with lithium source, and calcined in the presence of oxidizing gas .

[0010] According to the preparation method of the present invention, the particle size of the spherical lithium manganate depends on the preparation particle size of its precursor. Therefore, if one wants to obtain spherical lithium manganese oxide with uniform particle size, the particle size of spherical manganese carbonate particles needs to be uniform, so the particle size span (D 90 -D 10 ) / D 50 Be below 1.5, preferably (D 90 -D 10 ) / D 50 1 or less, more preferably (D 90 -D 10 ) / D 50 0.8 or less.

[0011] According to the preparation method of the present invention, before the manganese carbonate is calcined and mixed wit...

Embodiment 1

[0035] Prepare MnSO with a concentration of 1.6 mol / L 4 And 0.08 mol / liter cobalt sulfate mixed salt solution, 0.96 mol / liter sodium carbonate, 0.02 mol / liter sodium hydroxide and 0.55 mol / liter ammonia water mixed alkali solution. Add 20 liters of water in a 100-liter reactor as the bottom liquid, control the temperature at 30°C, stir vigorously, and add mixed salt solution, sodium carbonate solution and mixed alkali solution. Control MnSO 4 The flow rate of the aqueous solution is 40 ml / min, the flow rate of the sodium carbonate solution is 80 ml / min, and the flow rate of the mixed alkali solution is controlled to stabilize the pH value at 7.8±0.1. Reaction began to overflow after 7 hours, and the manganese carbonate product was discharged into the receiving tank from the overflow port. The manganese carbonate product obtained after reacting for 40 hours has a stable composition, and the same manganese carbonate product can be obtained by continuing the reaction afterwards...

Embodiment 2

[0054] First prepare Mn(NO 3 ) 2 And 0.05 mol / liter cobalt sulfate, 0.05 mol / liter nickel sulfate mixed salt solution, prepare 0.85 mol / liter sodium carbonate, prepare 0.12 mol / liter sodium hydroxide and 0.05 mol / liter ammonia water mixed alkali solution. Add 20 liters of water in a 100-liter reactor as the bottom liquid, control the temperature at 50°C, stir vigorously, and add mixed salt solution, sodium carbonate solution and mixed alkali solution. Control MnSO 4 The flow rate of the aqueous solution is 40 ml / min, the flow rate of the sodium carbonate solution is 80 ml / min, and the flow rate of the mixed alkali solution is controlled to stabilize the pH value at 9.0±0.1. Reaction began to overflow after 7 hours, and the manganese carbonate product was discharged into the receiving tank from the overflow port. The product obtained after reacting for 40 hours has a stable composition, and the same manganese carbonate product can be obtained by continuing the reaction after...

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Abstract

The invention relates to a making method of round-shape manganese acid lithium battery anode material, comprising that the round-shape carbonic acid manganese is baked under the existence of oxidbillity gas and from 300 centidegrees to 800 centidegrees for 2 hours to 5 hours, mixed evenly with lithium source and baked under the existence of oxidbillity gas so as to acquire the round-shape manganese acid lithium battery anode activity material. The invention can make the round-shape manganese acid lithium with controllable grain range from 5 microns to 50 microns. The art process is easy to be controlled; therefore, the invention is in particular applicable to continuous production in industry.

Description

technical field [0001] The invention relates to a preparation method of a cathode active material of a lithium ion battery. Background technique [0002] The materials that can be used as the positive electrode of lithium-ion batteries mainly include embedded compounds formed by lithium and transition metal elements, such as layered Li x MO 2 Structure and spinel Li x m 2 o 4 Structure oxides (M = Co, Ni, Mn, Cr and other transition metals), among which LiNiO is more researched 2 、LiCoO 2 and LiMn 2 o 4 . [0003] At present, the cathode material of lithium-ion secondary batteries widely used is LiCoO 2 , LiCoO 2 Cobalt has high specific energy, good cycle performance, and simple preparation process, but its safety performance is poor, cobalt is expensive, resources are limited, and pollution is large, so it is urgent to find alternative materials. LiNiO 2 Although its specific energy is high and its price is moderate, its cycle performance is poor, its synthesis...

Claims

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Application Information

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IPC IPC(8): C01G45/12H01M4/58H01M4/505
CPCY02E60/12Y02E60/10
Inventor 熊德宇荣强姜占锋
Owner BYD CO LTD
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