Method for improving electrochemical performance of positive material LiNi0.5Mn1.5O4 of lithium ion battery

A technology of lithium-ion batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as health hazards and chromium environmental pollution, and achieve the effects of reducing human health hazards, reducing environmental pollution, and avoiding shedding

Inactive Publication Date: 2010-10-13
HARBIN INST OF TECH
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Problems solved by technology

However, chromium seriously pollutes the environment and endangers people's health.

Method used

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  • Method for improving electrochemical performance of positive material LiNi0.5Mn1.5O4 of lithium ion battery
  • Method for improving electrochemical performance of positive material LiNi0.5Mn1.5O4 of lithium ion battery

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specific Embodiment approach 1

[0011] Specific implementation mode one: in this implementation mode, improve lithium-ion battery cathode material LiNi 0.5 mn 1.5 o 4 The method of electrochemical performance is achieved by the following steps: Chromium nitrate (Cr(NO 3 ) 3 9H 2 O) dissolved in ethanol aqueous solution, then add LiNi 0.5 mn 1.5 o 4 , at room temperature, ultrasonic frequency 20 ~ 100kHz conditions ultrasonic dispersion 5min ~ 120min, chromium nitrate quality is LiNi 0.5 mn 1.5 o 4 Stir in a water bath at 50-70°C until the liquid phase disappears, then calcinate at 800-900°C for 0.5-10h, cool naturally, and in LiNi 0.5 mn 1.5 o 4 The surface layer of the positive electrode material is doped with Cr 3+ , that is, the lithium-ion battery cathode material LiNi with high electrochemical performance is obtained 0.5 mn 1.5 o 4 wherein the volume concentration of the aqueous ethanol solution is 50% to 95%, and the mass ratio of the chromium nitrate to the aqueous ethanol solution is 1...

specific Embodiment approach 2

[0012] Embodiment 2: This embodiment differs from Embodiment 1 in that: the ultrasonic frequency is 28-80 kHz. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Embodiment 3: This embodiment is different from Embodiment 1 in that: the ultrasonic frequency is 40 kHz. Other steps and parameters are the same as in the first embodiment.

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Abstract

The invention discloses a method for improving the electrochemical performance of a positive material LiNi0.5Mn1.5O4 of a lithium ion battery, and belongs to the field of the positive material of the lithium ion battery. The method reduces the using amount of Cr<3+> for improving the electrochemical performance of LiNi0.5Mn1.5O4 by a conventional bulk phase doping method, reduces the environmental pollution and the human health hazard caused thereby and eliminates the hidden trouble of striping of a covering layer existing in a covering modification method. The method comprises the following steps of: dissolving chromium nitrate in aqueous solution of ethanol; adding LiNi0.5Mn1.5O4 into the solution and dispersing and stirring the mixture until the liquid phase is eliminated; and calcining the mixture and naturally cooling the mixture to obtain the positive material LiNi0.5Mn1.5O4 of the lithium ion battery with high electrochemical performance. The method improves the electrochemical performance of the positive material LiNi0.5Mn1.5O4 of the lithium ion battery, reduces the using amount of the chromium salt, ensures no obvious boundary between the doped Cr<3+> layer and the body of the positive material, reduces the environmental pollution, and also reduces the hazard to the human health.

Description

technical field [0001] The invention belongs to the field of positive electrode materials of lithium ion batteries; 0.5 mn 1.5 o 4 method for electrochemical performance. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices such as mobile communication tools, cameras, and notebook computers due to their high energy density, no memory effect, wide operating temperature range, and no pollution to the environment. In addition, the environmental pollution caused by fuel vehicles is getting more and more attention. The electric vehicle, which is the focus of research, is the fundamental solution to this problem. Therefore, lithium-ion batteries have been used as high-power power sources in electric vehicles (EV) and hybrid electric vehicles ( HEV) and other fields. Under the social background of the urgent need for high energy density and high output power mobile power sources such as electric vehicles and the emergence of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 张乃庆杨同勇孙克宁朗野
Owner HARBIN INST OF TECH
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