Method for preparing alkaline secondary cell anode active matter

A positive electrode active material and secondary battery technology, applied in alkaline battery electrodes, electrode manufacturing, battery electrodes, etc., can solve the problems of uneven trivalent cobalt oxide layer, long reaction time, harsh reaction conditions, etc., and achieve effective Conducive to large-scale industrial production, uniform CoOOH layer, simple and easy operation

Inactive Publication Date: 2008-02-06
BYD CO LTD
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Problems solved by technology

[0012] The purpose of the present invention is on the one hand in order to overcome the harsh reaction conditions, many reaction equipments, complex operation and long reaction time defects of the existing method for preparing the positive electrode active material of alkaline secondary batteries; The trivalent cobalt oxide is completely deposited on the positive electrode active material, and the particle shape of the obtained positive electrode active material is

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  • Method for preparing alkaline secondary cell anode active matter

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Embodiment 1

[0033] This embodiment illustrates the preparation of the alkaline secondary battery cathode active material provided by the present invention

[0034] (1) Under stirring, 36 grams of Co(NO 3 ) 2 The solution (with a divalent cobalt ion concentration of 3.5 mol / liter) was continuously added dropwise to 400 g of spherical nickel hydroxide particles (Japan, Tanaka spherical nickel hydroxide) within 5 minutes to fully wet the nickel hydroxide particles. Then vacuum-dried at 100°C for 0.5 hours, and passed through a 200-mesh sieve to obtain 3 ) 2 spherical nickel hydroxide particles.

[0035] (2) under stirring, 38 grams of sodium hydroxide solution (the concentration of hydroxide ion is 19 mol / liter) is dripped continuously on the spherical nickel hydroxide particle that step (1) obtains in 5 minutes, nickel hydroxide The particles are fully wetted so that the divalent cobalt salt contained in the nickel hydroxide particles in the step (1) reacts in the alkaline water film fo...

Embodiment 2

[0038] This embodiment illustrates the preparation of the alkaline secondary battery cathode active material provided by the present invention

[0039] (1) Under stirring, mix 62 grams of CoSO 4 The solution (with a cobalt ion concentration of 2.0 mol / liter) was continuously added dropwise to 400 g of spherical nickel hydroxide particles (Japan, Tanaka spherical nickel hydroxide) within 5 minutes to fully wet the nickel hydroxide. Then vacuum-dried at 100°C for 0.5 hours, and passed through a 200-mesh sieve to obtain 4 spherical nickel hydroxide particles.

[0040] (2) under stirring, 60 grams of sodium hydroxide solution (the concentration of hydroxide ion is 12 mol / liter) is dripped continuously in 5 minutes on the spherical nickel hydroxide particle that step (1) obtains, the hydroxide The nickel particles are fully wetted, so that the divalent cobalt salt contained in the nickel hydroxide particles in the step (1) reacts in the alkaline water film formed in the step (2),...

Embodiment 3

[0043] This embodiment illustrates the preparation of the alkaline secondary battery cathode active material provided by the present invention

[0044] (1) Under stirring, 48 grams of Co(NO 3 ) 2 The solution (with a cobalt ion concentration of 3.0 mol / liter) was continuously added dropwise to 400 g of spherical nickel hydroxide particles (Japan, Tanaka spherical nickel hydroxide) within 5 minutes to fully wet the nickel hydroxide. It was then vacuum dried at 100° C. for 0.5 hours. Then repeat the above-mentioned steps (1) once again, after drying, nickel hydroxide is passed through a 200-mesh sieve to obtain a compound containing Co(NO 3 ) 2 spherical nickel hydroxide particles.

[0045] (2) under stirring, 52 grams of potassium hydroxide solution (the concentration of hydroxide ion is 15 mol / liter) is dripped continuously on the spherical nickel hydroxide particle that step (1) obtains in 5 minutes, the hydroxide The nickel particles are fully wetted, so that the divale...

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Abstract

The invention relates to a method for fabricating an active substance of alkaline secondary battery positive pole, wherein, the invention comprises the steps that a bivalent cobalt salts solution is used to moisten a nickel hydroxide which is dried to get the nickel hydroxide containing the bivalent cobalt salts, the nickel hydroxide containing bivalent cobalt salts is contacted with an alkaline solution, the nickel hydroxide deposited with Co(OH)2 to be made under an oxidizing condition is contacted with an oxidizer, so the nickel hydroxide containing the cobalt oxy-hydroxide is made out, the weight ratio between the bivalent cobalt salts solution and the nickel hydroxide is 0.05-0.25:1; the cobalt oxy-hydroxide layer of the nickel hydroxide made by the invention is uniform, the granule shape of the nickel hydroxide is regular, which are all separately independent individual, the agglomeration problem can not occur, therefore, after the nickel hydroxide granule containing the cobalt oxy-hydroxide is fabricated into a battery, the performance of the batter is favorable; furthermore, the equipment used for the invention is simple, the reaction process does not have the conditions which need to be strictly controlled, the operation is easy and feasible.

Description

technical field [0001] The invention relates to a method for preparing positive electrode active materials of alkaline secondary batteries. Background technique [0002] Alkaline secondary batteries include nickel-cadmium secondary batteries, nickel-zinc secondary batteries and nickel-hydrogen secondary batteries, etc., and their positive electrode active material is spherical nickel hydroxide. The performance of alkaline secondary batteries is greatly affected by the positive active material, so the improvement of the performance of spherical nickel hydroxide has always been a main direction of people's research. [0003] Nickel hydroxide is an electronic insulator, also known as a low-conductivity P-type semiconductor. Therefore, there is a large contact resistance between nickel hydroxide particles and between nickel hydroxide and the current collector, which makes it unable to fully react during charge and discharge. , affects the utilization rate of the positive active...

Claims

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Application Information

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IPC IPC(8): C01G53/00C01G51/00H01M4/04H01M4/52H01M4/26
CPCY02E60/124Y02E60/10
Inventor 周文会陈三志余峰
Owner BYD CO LTD
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