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Method for preparing spherical lighium manganate anode material of lighium ion batteries

A technology of lithium-ion batteries and spherical lithium manganese oxide, which is applied in the direction of electrode manufacturing, battery electrodes, active material electrodes, etc., can solve the problems of limited practical application, low specific capacity, and poor cycle performance, so as to improve cycle stability, Effect of high specific capacity and improved high temperature performance

Inactive Publication Date: 2003-10-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with LiCoO 2 Compared to LiMn 2 o 4 The specific capacity is low (LiCoO 2 The mass specific capacity is generally 140mAh g -1 Around, the tap density can reach 2.4g cm -3 above; while LiMn 2 o 4 The mass specific capacity is 120mAh·g -1 Around, currently commercially available LiMn 2 o 4 The tap density is 1.8~2.0g·cm -3 )
In addition, LiMn 2 o 4 Poor cycle performance at high temperature (greater than 50°C)
The above disadvantages limit the LiMn 2 o 4 practical application of

Method used

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  • Method for preparing spherical lighium manganate anode material of lighium ion batteries
  • Method for preparing spherical lighium manganate anode material of lighium ion batteries

Examples

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Embodiment 1

[0032] Prepare MnSO with a concentration of 2.5 mol / L 4 Aqueous solution, prepared with 5 mol / L NaOH and 1 mol / L NH 3 mixed aqueous solution. Separately MnSO with a metering pump 4 , NaOH and NH 3 The mixed aqueous solution was input into a 3-liter volume reactor filled with deionized water in advance for reaction. Control MnSO 4 The flow rate of aqueous solution is 120ml / hour, adjust NaOH and NH 3The flow rate of the mixed solution is such that the pH value of the reaction solution in the reactor is 9.5±0.1. The temperature inside the reactor was controlled to be 45°C. The solid-liquid mixture in the reactor naturally overflows into the receiving tank. After feeding continuously for 20 hours, stop feeding, discharge the material in the reactor, and carry out solid-liquid separation with a centrifuge. Wash the solid product with deionized water at 60°C until the pH value of the washing water reaches 7-8. Dry the washed product in a drying oven at 80-100°C for 3-4 hour...

Embodiment 2

[0034] Prepare spherical Mn under the same conditions as in Example 1 3 o 4 . Weigh 24.2 g Li 2 CO 3 And measure 10 milliliters of deionized water, put it in a ball mill and stop it after 1 hour of ball milling. Weigh 100 grams of Mn prepared above 3 o 4 , into the ball-milled Li 2 CO 3 In the slurry, stir slowly for 5 minutes to obtain a mixed slurry. Put the mixed slurry into an alumina crucible, heat up to 750°C at a rate of 100°C / hour in a muffle furnace, keep the temperature constant for 20 hours, stop heating, and naturally cool to room temperature in the furnace to obtain spherical LiMn 2 o 4 product. The average particle size of the product was measured to be 8-10 μm, and the tap density was 2.28 g cm -3 . With lithium sheet as the negative electrode, the LiMn 2 o 4 The first discharge specific capacity at room temperature is 121mAh·g -1 .

Embodiment 3

[0036] With 2.5 mol / L Mn(NO 3 ) 2 Aqueous solution instead of MnSO 4 Aqueous solution, other conditions are identical with embodiment 1, prepare spherical LiMn 2 o 4 product. The average particle size of the product was measured to be 8-10 μm, and the tap density was 2.31 g cm -30 . With lithium sheet as the negative electrode, the LiMn 2 o 4 The first discharge specific capacity at room temperature is 127mAh·g -1 .

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Abstract

A spherical managanic manganeous oxide is created through the reaction among the aqueous solution of manganese salt with concentration 0.5-3 mol / liter, the alkaline aqueous solution with concentration 2-6 mol / liter and one, two or more than two aqueous solutions from ammonia, ethylene diamine, oxalic acid and citric acid create. With being washed and dried, spherical manganic manganous oxide is mixed with lithium hydroxide or lithium carbonate passing through the 700-800 deg.C heat treatment so as to obtain the product of spherical lithium manganate. The material prepared by the invention possesses the advantages of high specific capacity, 2.2-2.5 g / cm-3 tap density, improved cycling stability by adulterating other elements (for ex. Co, Cr) and has great application value.

Description

technical field [0001] The invention relates to a preparation method of spherical lithium manganese oxide, a cathode material of a lithium ion battery, and belongs to the technical field of energy materials. Background technique [0002] At present, the commercial lithium-ion battery cathode material is mainly LiCoO 2 , due to the high price of Co, the further reduction of the cost of lithium-ion batteries is limited. Over the years, people have been working on research and development of cheaper cathode materials. Among them, LiMn 2 o 4 Considered as the most promising alternative to LiCoO 2 One of the materials, and has been applied in small batches. LiMn 2 o 4 As a cathode material for lithium-ion batteries, it is rich in resources and cheap; it has low toxicity and is basically harmless to the environment; it has good volume effect (lithium-ion batteries use carbon materials as negative electrodes, and the volume of carbon negative electrodes will expand during ch...

Claims

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Application Information

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IPC IPC(8): C01D15/02H01M4/02H01M4/04H01M4/48H01M4/50
CPCH01M4/505Y02E60/122H01M4/131H01M4/1391Y02E60/10
Inventor 姜长印万春荣应皆荣何向明陈史勤李维蔡砚王要武
Owner TSINGHUA UNIV
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