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Lithium ion battery capable of low-temperature working

A lithium-ion battery, working technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of one-sided failure to comprehensively consider the low temperature performance and high temperature characteristics of the battery, so as to ensure the viscosity of the electrolyte and the ionic conductivity. The effect of avoiding the solidification of the electrolyte and ensuring the low temperature discharge performance

Active Publication Date: 2006-06-21
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, their studies are one-sided, and they do not comprehensively consider the low-temperature performance and high-temperature characteristics of the battery, the low-temperature performance after multiple cycles, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: According to the following procedure, select LiCoO 2 10 kinds of batteries were prepared with different particle sizes and different ratios of D1:EA for data test:

[0020] Preparation of positive plates containing lithium cobalt oxide with various particle sizes: LiCoO with an average D50 particle size of 12 microns 2 The powder is ball milled and reclassified to make four kinds of D50: 12 microns, 7 microns, 5 microns and 2 microns. Then, weigh the above-mentioned positive electrode active materials with different particle sizes, and make LiCoO with a solid content of 93wt% respectively. 2 , the NMP solution of 4.5wt% PVdF binding agent, the conductive material of 2.5wt% acetylene black: VGCF=2: 1, the three are mixed to form positive electrode mixture, add NMP in the mixture and prepare paste with stirrer, then put Coating weight is 43mg / cm 2 The paste was evenly applied to both sides of aluminum foil with a thickness of 20 μm, and then dried and rol...

Embodiment 2

[0029] Follow the procedure below, select LiCoO 2 The particle size is 5 microns, and different amounts of VC are added to the following electrolytes to prepare A41, A51, A61, and B4. The test data of the 4 batteries are compared with the battery A11 in Example 1:

[0030] Preparation of the positive plate of lithium cobalt oxide: LiCoO with an average D50 particle size of 12 microns 2 The powder is ball milled and then made into a particle size of 5 microns. Then take the positive electrode active material to make LiCoO with a content of 93wt% in the solid component 2 , the NMP solution of 4.5wt% PVdF binding agent, the conductive material of 2.5wt% acetylene black: VGCF=2: 1, the three are mixed to form positive electrode mixture, add NMP in the mixture and prepare paste with stirrer, then put Coating weight is 43mg / cm 2 The paste was evenly applied to both sides of aluminum foil with a thickness of 20 μm, and then dried and rolled to obtain a positive plate. D50 is the ...

Embodiment 3

[0039] Follow the procedure below, select LiCoO 2 Particle diameter 5 microns, do not add VC and add VC in the following electrolytic solution, prepare 2 batteries A71, A81, carry out test data comparison with battery A11 in the embodiment 1:

[0040] Preparation of the positive plate of lithium cobalt oxide: LiCoO with an average D50 particle size of 12 microns 2 The powder is ball milled and then made into a particle size of 5 microns. Then take the positive electrode active material to make LiCoO with a content of 93wt% in the solid component 2 , the NMP solution of 4.5wt% PVdF binding agent, the conductive material of 2.5wt% acetylene black: VGCF=2: 1, the three are mixed to form positive electrode mixture, add NMP in the mixture and prepare paste with stirrer, then put Coating weight is 43mg / cm 2 The paste was evenly applied to both sides of aluminum foil with a thickness of 20 μm, and then dried and rolled to obtain a positive plate. D50 is the positive plate A1 made...

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Abstract

The invention relates to a lithium ion cell fit to low temperature, which comprises: a positive electrode with active material as Li-containing transition metal oxide with D50 size less than 5ª–m, a negative electrode, a non-aqueous electrolyte contained straight-chain ester organic solvent with carbon atom number less than 5. This invention reduces solid-phase ion diffusion distance, enlarges reaction area to decrease reaction and solid-phase diffusion impedances, realizes discharge capacity at -20Deg even -50Deg, and avoids the salt separation and electrolyte solidification.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery capable of working at low temperature. Background technique [0002] At present, when the traditional lithium-ion battery is around -20°C, the impedance of the battery is many times higher than that at normal temperature. Moreover, the impedance of its electrolyte increases with the decrease of temperature, and the impedance of charge movement, especially the semicircle impedance on the low-frequency side of the positive electrode becomes very large at low temperature, so that the voltage and discharge capacity have become very low, and when the temperature drops to - At 40°C, EC and LiPF6 have already precipitated, and the electrolyte solidifies so that the battery cannot be used at all. It cannot meet the power requirements of electrical appliances working in cold environments, electric transport carriers, electric tools, etc. [0003] In o...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M10/0525H01M10/0569
CPCY02E60/10
Inventor 刘兴江张遥喻津汉吴滨成朱广焱杨凯
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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