JP2015185446A5

JP2015185446A5 -

Info

Publication number: JP2015185446A5
Application number: JP2014062144A
Authority: JP
Filing date: 2014-03-25
Publication date: 2017-04-06
Anticipated expiration: 2034-03-25

Description

上記課題を解決するため、本発明者らは、鋭意検討の結果、Ｌｉと合金化可能な金属粒子表面が特定の化合物によって修飾された非水系二次電池用複合黒鉛粒子を適用することによって、高容量であり、クーロン効率が高く、かつ高サイクル特性を有する非水系二次電池が得られることを見出し、本発明を完成するに至った。
本発明の要旨は、下記＜１＞〜＜５＞に示す通りである。
＜１＞黒鉛およびＬｉと合金化可能な金属粒子を含む非水系二次電池負極用黒鉛粒子であって、
上記Ｌｉと合金化可能な金属粒子表面が下記（１）式で表される化合物、下記（２）式で表される化合物及びこれらの加水分解物のうちの少なくとも１つにより修飾されていることを特徴とする非水系二次電池負極用黒鉛粒子。
In order to solve the above-mentioned problems, the present inventors, as a result of intensive studies, applied the composite graphite particles for non-aqueous secondary batteries in which the surface of metal particles that can be alloyed with Li is modified with a specific compound, The inventors have found that a non-aqueous secondary battery having a high capacity, high coulomb efficiency, and high cycle characteristics can be obtained, and the present invention has been completed.
The gist of the present invention is as shown in the following <1> to <5>.
<1> Graphite particles for a non-aqueous secondary battery negative electrode containing metal particles that can be alloyed with graphite and Li,
The Li can be alloyed metal particle surface following (1) a compound represented by the formula, is more qualified to at least one of the following (2) a compound represented by the formula and their hydrolysates Graphite particles for non-aqueous secondary battery negative electrode characterized by the above.

Claims

A graphite particle for a non-aqueous secondary battery negative electrode comprising metal particles that can be alloyed with graphite and Li,
The Li can be alloyed metal particle surface following (1) a compound represented by the formula, is more qualified to at least one of the following (2) a compound represented by the formula and their hydrolysates A graphite particle for a negative electrode of a non-aqueous secondary battery.
SiR ¹ _a (OR ² ) _b (1)
However, in formula (1), R ¹ is an organic group which may contain a nitrogen atom, an oxygen atom or a sulfur atom, and they may all be the same or different, and R ² is a hydrocarbon group or hydrogen. Atoms are all the same or different, a is 0 or an integer of 1 to 3, b is an integer of 1 to 4, and a + b = 4.
R ³ —P (═O) (OH) ₂ (2)
However, in Formula (2), R < ³ > is an organic group which may contain a nitrogen atom, an oxygen atom, and a sulfur atom.

2. The non-aqueous system according to claim ¹ , wherein R ¹ and R ³ represented by the formulas (1) and (2) are saturated hydrocarbon groups which may have a substituent. Graphite particles for secondary battery negative electrode.

3. The composite graphite particle for a non-aqueous secondary battery negative electrode according to claim 1, wherein the metal particle contains at least one of Si and SiO _x (0 <x <2).

The composite graphite particles for a non-aqueous secondary battery negative electrode according to any one of claims 1 to 3, wherein the metal particles are contained in an amount of 1 to 30% by mass.

A non-aqueous secondary battery comprising a positive electrode and a negative electrode capable of occluding and releasing metal ions, and an electrolyte, wherein the negative electrode comprises a current collector and a negative electrode active material formed on the current collector It is a negative electrode for secondary batteries, The said negative electrode active material contains the composite graphite particle for nonaqueous secondary battery negative electrodes as described in any one of Claims 1 thru | or 4. The nonaqueous secondary battery characterized by the above-mentioned.