Additive for Electrochemical Elements, Electrolyte Solution for Electrochemical Elements, Electrochemical Element, Electrolyte Solution for Lithium Ion Secondary Batteries, Lithium Ion Secondary Battery and Method for Producing Additive for Electrochemical Elements

摘要

The purpose of the present invention is to provide: an additive for electrochemical elements, which is capable of improving the service life characteristics of a battery, while having high physical stability; an electrolyte solution for electrochemical elements, which uses this additive for electrochemical elements; an electrochemical element; an electrolyte solution for lithium ion secondary batteries; a lithium ion secondary battery; and a method for producing an additive for electrochemical elements. An additive for electrochemical elements according to the present invention is characterized by being represented by general formula [(BO)₃(OR)₃]m(H₂O)n (wherein each of m and n represents an integer of 1 or more; and each R independently represents an organic group having 1 or more carbon atoms). A method for producing an additive for electrochemical elements according to the present invention is characterized by a synthesis by means of dehydration condensation of boric acid and an alcohol.