Lithium ion battery in-situ pre-lithiation method and lithium ion battery

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

Active Publication Date: 2019-04-23
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Lithium ion battery in-situ pre-lithiation method and lithium ion battery
  • Lithium ion battery in-situ pre-lithiation method and lithium ion battery
  • Lithium ion battery in-situ pre-lithiation method 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 Applications(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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