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Pre-lithiation lithium ion battery positive electrode material and preparation method thereof

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of low initial efficiency, achieve the effect of improving battery energy density and improving the first charge and discharge Coulombic efficiency

Inactive Publication Date: 2019-06-14
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] In order to solve the technical problems existing in the background technology, the present invention provides excess lithium in the process of first charging by adding excess lithium during the synthesis process of the positive electrode material of the lithium ion battery, so as to make up for the problem of low initial efficiency caused by the consumption of the negative electrode

Method used

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  • Pre-lithiation lithium ion battery positive electrode material and preparation method thereof
  • Pre-lithiation lithium ion battery positive electrode material and preparation method thereof
  • Pre-lithiation lithium ion battery positive electrode material and preparation method thereof

Examples

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preparation example Construction

[0024] The pre-lithiated lithium-ion battery positive electrode material prepared by the above preparation method of the pre-lithiated lithium-ion battery positive electrode material.

[0025] The details are as follows:

Embodiment 1

[0028] The precursor of NCM111 material was prepared by co-precipitation method, and Li 2 CO 3 As a lithium source, the Li molar excess is 15%.

[0029] The above precursor was mixed with excess Li by ball milling method 2 CO 3 Mixed, roasted at 800°C in an oxidizing atmosphere, and then crushed and sieved.

[0030] SEM picture of cathode material after lithium supplementation figure 1 .

Embodiment 2

[0032] Using commercial NCM111 material, Li 2 CO 3 The molar amount is 3% of the NCM111 material.

[0033] The above NCM111 material was mixed with Li by ball milling method 2 CO 3 Mix, roast at 800°C in an oxidizing atmosphere, then crush and sieve

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Abstract

The invention discloses a pre-lithiation lithium ion battery positive electrode material and a preparation method thereof. According to the pre-lithiation lithium ion battery positive electrode material, excess lithium is added, wherein the added lithium accounts for 1% or above based on molar ratio. The positive electrode material of the lithium ion battery is a lithium metal oxide, which is preferably selected from one of LiNi0.5Mn1.5O2, LiNi0.8Co0.15Al0.05O2, LiCoO2, LiMnO2, LiNi0.33Mn0.33Co0.33O2 or Li2MnO3. The excess lithium is added in the material synthesis process or in the post-treatment process. According to the method, excess lithium is added into the positive electrode material, and extra lithium is provided in the initial charging and discharging process, so that the initialcharge and discharge coulombic efficiency of the lithium ion battery and the energy density of the battery can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, in particular to a pre-lithiated lithium ion battery positive electrode material and a preparation method thereof, which can improve the first charge and discharge coulombic efficiency of the lithium ion battery. Background technique [0002] Since the launch of lithium-ion batteries in the 1990s, they have won wide market recognition due to their advantages such as high energy density and long cycle life. Especially in recent years, the rapid development of the electric vehicle industry has further promoted the development of lithium-ion batteries. With the continuous improvement of energy density of power batteries, traditional graphite materials can no longer meet the design requirements of high specific energy batteries, and the application of high-capacity silicon materials is imperative. [0003] SiO with smaller volume expansion during charge and discharge X The material be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 杜园王炜娜郑见杰
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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