A method for in-situ pre-lithiation of lithium ion battery and lithium ion battery

A lithium-ion battery, in-situ technology, applied in battery electrodes, secondary battery charging/discharging, secondary batteries, etc., can solve the problems of fast capacity decay, low coulomb efficiency, etc., to achieve improved cycle performance, simple process, The effect of increasing energy density

Active Publication Date: 2021-01-12
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the technical problems of low coulombic efficiency and fast capacity decay in the early stage of lithium-ion battery silicon-based negative electrode cycle, the present invention provides a method for in-situ pre-lithiation of silicon-based negative electrode of lithium-ion battery. Battery energy density and cycle stability

Method used

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  • A method for in-situ pre-lithiation of lithium ion battery and lithium ion battery
  • A method for in-situ pre-lithiation of lithium ion battery and lithium ion battery
  • A method for in-situ pre-lithiation of lithium ion battery and lithium ion battery

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Embodiment 1

[0030] The silicon-carbon composite material with an active silicon content of 15% is used as the negative electrode material, and the lithium-rich manganese-based material is 0.4Li 2 MnO 3 0.6Li(Ni 0.33 co 0.33 mn 0.33 )O 2 As the positive electrode material, N1 / P1=0.90 (N2 / P2 is 1.05) is designed, and a soft-packed lithium-ion battery with a winding structure is prepared.

[0031] Among them, the silicon-carbon composite material with an active silicon content of 15% has a first Coulombic efficiency of 85% and a reversible specific capacity (N2) of 850mAh / g in the voltage range of 5mV to 1.5V; the lithium-rich manganese-based material is 0.4Li 2 MnO 3 0.6Li(Ni 0.33 co 0.33 mn 0.33 )O 2 In the voltage range of 2.0-4.8V, the first Coulombic efficiency is 73%, and the reversible specific capacity (P2) is 230mAh / g.

[0032] The prepared lithium-ion battery is charged to a fully charged state in the first week at a voltage range of 2.0-4.7V and a rate of 0.1C. The desig...

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Abstract

The invention discloses a lithium ion battery in-situ pre-lithiation method and a lithium ion battery. The method comprises the following steps of (1) matching a silicon-based negative electrode material with a positive electrode material; assembling the materials into the lithium ion battery, wherein the lithium embedding volume of the silicon-based negative electrode material is N1; the lithiumremoval volume is N2; the charging capacity of the positive electrode material is P1, and the discharging capacity is P2; N2 / N1 is greater than P2 / P1; N1 / P1 is smaller than N2 / P2; the value of N2 / P2 is 1.02 to 1.20; the value of N1 / P1 is 0.85 to 1.05; (2) activating the lithium ion battery in different stages; at the first stage, charging the lithium ion battery until the capacity is not higher than N1 / P1*100 percent SOC1; performing discharging until the voltage is not lower than the lower limit voltage of a battery design voltage range; at a second stage, performing charging until the capacity is not higher than 100 percent SOC2; performing discharging until the voltage is not lower than the lower limit voltage of the battery design voltage range; performing activation for 3 to 30 weeks.The manufacturing work procedure of the lithium ion battery is not increased by the invention; the operation is safe and convenient. The lithium ion battery comprising the in-situ pre-lithiation silicon-based negative electrode obtained by the method has the advantages of high energy density, long circulation and the like.

Description

technical field [0001] The invention relates to a method for in-situ pre-lithiation of a lithium ion battery and the lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, long cycle life, and low self-discharge, and have been widely used in portable electronic products. In recent years, with the advancement of materials and the improvement of production technology, lithium-ion batteries have been widely used in the fields of pure electric vehicles (EV) and hybrid electric vehicles (PHEV). The cruising range of a pure electric vehicle is directly related to the energy density of a single battery, so increasing the energy density of a single battery is the key to increasing the cruising range of a pure electric vehicle. [0003] Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, separators, electrolyte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M4/38H01M10/0525
CPCH01M4/386H01M10/0525H01M10/446H01M10/448Y02E60/10
Inventor 武兆辉邵泽超王建涛武佳雄马磊磊李翔庞静卢世刚
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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