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Lithium secondary cell

一种二次电池、电解液的技术，应用在二次电池、锂蓄电池、电池等方向，能够解决未描述氟化溶剂与砜化合物混合的实例等问题，达到改进容量的下降、抑制气体的产生的效果

Active Publication Date: 2015-02-18
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Patent Documents 1 and 2 do not describe an example in which a fluorinated solvent is mixed with a sulfone compound

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0197] (production of positive electrode)

[0198] First, weigh the MnO at the expected composition ratio 2 , NiO, Li 2 CO 3 and Ti 3 o 3 powder, crush and mix. Subsequently, the mixed powders were calcined at 750 °C for 8 h to fabricate LiNi 0.5 mn 1.37 Ti 0.13 o 4 . This positive electrode active material was confirmed to have an almost single-phase spinel structure. The manufactured cathode active material is mixed with carbon black as a conductivity-imparting agent, and the mixture is dispersed in a solution of polyvinylidene fluoride (PVDF) to thereby prepare a cathode slurry. Soluble in N-methylpyrrolidone and acts as a binder. The mass ratio of the positive electrode active material, the conductivity imparting agent and the positive electrode binder is 91 / 5 / 4. The positive electrode slurry was uniformly applied to both sides of the current collector formed of Al. Subsequently, the current collector was dried in vacuum for 12 hours and subjected to compressi...

Embodiment 2～11 and comparative example 1～3

[0206] A battery was fabricated as in Example 1 except that the composition of the solvent and additives in the electrolytic solution was set as described in Table 1. As shown in Table 1, in Examples 4 to 11, in addition to SL and FE1, one or more solvents selected from the following solvents were mixed: MMDS (methylene disulfonate), PS (1,3-propane sultone), LiFSI, TFMP (methyl 2,2,3,3-tetrafluoropropionate), FEC (monofluoroethylene carbonate), PC (propylene carbonate) and EC (ethylene carbonate). In the examples in which two or more of the carbonate compounds and / or fluorinated carboxylate in Table 1 were mixed, the numbers in parentheses indicate the volume ratios of these substances. In addition, in the case of using additives, the numbers in parentheses indicate the content (% by mass) of the additives in the electrolytic solution.

[0207] (high temperature cycle test)

[0208]The high-temperature cycle characteristics of the batteries manufactured as described above ...

Embodiment 12～40

[0217] A battery was fabricated as in Example 1 except that an electrolytic solution containing a solvent having a composition ratio of fluorinated ether / sulfone compound / carbonate compound shown in Table 2 was used. An electrolytic solution further containing the additives shown in Table 2 was used in Examples 31-40. Table 2 shows the results of the evaluation carried out in Example 1. For Examples 12 to 40, satisfactory cycle characteristics were provided even if the composition ratio and type of the fluorinated ether / sulfone compound / carbonate compound were changed. Additional addition of additives makes the cycle characteristics satisfactory. It should be noted that, in the examples in which two or more carbonate compounds in Table 2 were used, the numbers in parentheses indicate the volume ratios of these substances. In addition, in the case of using additives, the numbers in parentheses indicate the content (% by mass) of the additives in the electrolytic solution.

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Abstract

The present invention pertains to a secondary cell having a positive electrode capable of occluding and releasing lithium, and a liquid electrolyte containing a non-aqueous electrolytic solvent, the secondary cell being characterized in that: the positive electrode has a positive electrode active material operating at 4.5 V or higher relative to lithium; and the non-aqueous electrolytic solvent contains a sulfone compound represented by a predetermined formula and a fluorinated ether compound represented by a predetermined formula.

Description

technical field [0001] The present invention relates to secondary batteries, in particular, to lithium ion secondary batteries. Background technique [0002] Lithium ion secondary batteries that are small in size and large in capacity have been widely used as power sources of electronic devices such as mobile phones and notebook computers and contribute to enhancing the convenience of mobile IT devices. The use of such batteries for large-scale applications such as power sources for automobiles and power storage devices for smart grids is now attracting attention. [0003] There is an urgent need to further increase the energy density of lithium ion secondary batteries, and examples of methods for increasing energy density include: a method of using an active material having a large capacity; a method of increasing the operating potential of the battery; and enhancing charge / discharge efficiency, cycle life etc. method. Among them, the method of increasing the operating po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M4/131H01M4/505H01M10/052H01M10/0567H01M10/0568
CPCH01M10/0567Y02E60/122H01M4/525H01M10/0569Y02T10/7011H01M10/0568H01M10/052H01M4/505H01M4/502H01M4/523H01M4/5825H01M10/0525H01M2220/10H01M2220/20H01M2220/30H01M2300/0037Y02E60/10Y10T29/49115Y02P70/50Y02T10/70
Inventor 高桥牧子野口健宏佐佐木英明加藤有光中村彰信
Owner NEC CORP
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