Method for increasing energy density of lithium ion battery and prolonging cycle life of lithium ion battery

A lithium-ion battery and energy density technology, applied in the field of lithium-ion batteries, can solve the problems of reduced battery energy density, reduced capacity, and reduced capacity of lithium-ion batteries, achieving the effect of simple process and convenient operation

Active Publication Date: 2017-01-04
桐乡市众胜能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The film formation on the surface of the graphite negative electrode and the high-order lithium stored are all derived from the active lithium of the positive electrode material, and the first-time efficiency of the lithium iron phosphate positive electrode material is very high, basically close to 100%, and many materials can reach 155-163mAh/g. The graphite negativ

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  • Method for increasing energy density of lithium ion battery and prolonging cycle life of lithium ion battery

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Embodiment 1

[0024] A method for improving the energy density and cycle life of lithium-ion batteries described in this embodiment uses lithium iron phosphate as the positive electrode active material, the gram specific capacity of lithium iron phosphate is 159mAh / g, and the initial efficiency is 99%; Graphite anode material, gram specific capacity 360mAh / g, initial efficiency 94%; LiCoO 2 As a supplementary active lithium material, LiCoO 2 It is added with the positive electrode active material during pre-sintering.

[0025] Among them, the production of the positive pole piece is: first configure 3wt% of the binder and 80-120wt% of the solvent methyl pyrrolidone into a glue, add 2wt% of the conductive agent to disperse well, and finally add 91.5wt% of the acid iron Lithium and 3.5 wt% LiCoO 2 , mix into a slurry, adjust the viscosity, and then coat the pole piece on a 0.016mm aluminum foil, with a double-sided density of 38mg / cm 2 , and rolled and cut to obtain the positive electrode ...

Embodiment 2

[0030] A method for improving the energy density and cycle life of lithium-ion batteries described in this embodiment uses lithium iron phosphate as the positive electrode active material, the gram specific capacity of lithium iron phosphate is 159mAh / g, and the initial efficiency is 98.5%; Graphite is the negative electrode active material, the gram specific capacity of artificial graphite is 360mAh / g, and the first efficiency is 94%; LiCoO 2 As a supplementary active lithium material, and LiCoO 2 It is added with the positive electrode active material during pre-sintering.

[0031] Among them, the production of the positive pole piece is: first configure 2wt% binder and 80-120wt% solvent methyl pyrrolidone to form a glue, add 1.5wt% conductive agent to disperse well, and finally add 89.5wt% phosphoric acid LiFe and 7wt% LiCoO 2 , mix into a slurry, adjust the viscosity, and coat the pole piece on a 0.016mm aluminum foil, with a double-sided density of 40mg / cm 2 , and roll...

Embodiment 3

[0036] This embodiment describes using lithium iron phosphate as the positive electrode active material, the gram specific capacity of lithium iron phosphate is 159mAh / g, and the initial efficiency is 99%; using artificial graphite as the negative electrode active material, the gram specific capacity of natural coated graphite is 355mAh / g, the first efficiency is 93%; with LiCoO 2 As a supplementary active lithium material, and LiCoO 2 It is added after premixing with the positive electrode active material.

[0037] Among them, the production of the positive electrode sheet is: first configure 2wt% of the binder and 100wt% of the solvent methyl pyrrolidone into a glue, add 1wt% of the conductive agent to disperse well, and finally add 87wt% of lithium iron phosphate and 10wt% % LiCoO 2 , mix into a slurry, adjust the viscosity, and coat a pole piece on a 0.016mm aluminum foil, with a double-sided density of 38mg / cm 2 , and rolled and cut to obtain the positive electrode sh...

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Abstract

The invention relates to the field of lithium ion batteries, in particular to a high-energy lithium ion phosphate battery, and aims at providing a method for increasing the capacity of a lithium ion phosphate battery, actually achieving the gram capacity of a lithium ion phosphate cathode material, enabling the capacity not to be reduced in the cyclic process, increasing the energy density of the lithium ion phosphate battery and prolonging the cycle life of the lithium ion phosphate battery. In the manufacturing process of the lithium ion battery, an active lithium material is added and supplemented into an active cathode material to form a mixed material, the gram capacity of the mixed material is improved, and the effective active lithium amount supplied by the supplemented active lithium material accounts for 1%-25% of the active lithium amount of the anode capacity; the supplemented active lithium material needs to be subjected to lithium removal, and the structure collapses after lithium removal, that is to say, the initial charge cut-off voltage is set as the voltage needed when the material is completely subjected to lithium removal until the material is in an irreversible state. The method has the advantages of being simple in process, convenient to operate and the like.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a high-energy lithium-ion battery. Background technique [0002] Lithium-ion battery refers to a type of lithium-ion battery that uses lithium-ion batteries as the positive electrode material. It has attracted the attention of the industry due to its outstanding features such as long life, high safety and stability, wide operating temperature range, and extensive material sources, especially power batteries. aspect. However, lithium-ion batteries also have their disadvantages, mainly because the working voltage is low, only 3.2V. Compared with the 3.7V of other commonly used lithium-ion cathode materials, the tap density is 1.0-1.4g / cm2 smaller. 3 , which causes the energy density of lithium-ion batteries to be low. Currently, the highest single lithium iron phosphate battery model is 26650 cylindrical batteries, and the energy density is only 140.9wh / Kg. The battery capacit...

Claims

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Application Information

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IPC IPC(8): H01M10/42H01M10/44
CPCH01M10/42H01M10/44Y02E60/10
Inventor 张欣欣刘芳华鲁正强张学全刘林吴宁
Owner 桐乡市众胜能源科技有限公司
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